Part Due (Rustler-Project - AKA Ultra-Rusty)
Soooo... once the Stampede Project Ultra-Pede was complete (more or less), I was in need of another challenge.
What do I have planned for the Rustler-Project?
High durability with an emphasis on weight reduction and SPEED!!!!...
The Project Stampede Ultra-Rusty Traxxas Rustler
Background
This project has been just as much fun as the Ultra-Pede and has been a hoot to find out how the how good the Rustler can be. Below is the chronological biography of the build.
What do I have planned for the Rustler-Project?
The Initial Assessment - 6/15/06
The Ebay auction photo to the right is what I have to work with. The Ebay description was roughly as follows - "A used Traxxas Rustler with a MSC (Mechanical Speed Control), missing a rear hub pin, original body in decent shape, with Proline Dirt Hawg II's all around, and a couple "Performance" batteries"
The initial task for the winning auction item is to assess what needs replacing. Although Jang's Ebay Rusty purchase was completely beat to hell, I was very pleasantly surprised to open the box and find a clean and barely used Traxxas Rustler. There were some problems, the MSC had a cracked servo arm and sandstone resister, it was as listed missing a rear drive pin, and a front kingpin was really bent - time to request a goodwill refund for the condition for the $20 in parts not listed as damaged. Although the auction photo to the right it looked a little beat my below pics show little or no wear. The Proline Dirt Hawg II tires are in almost pristine shape with lots of love left to give. The wheels are a bit wobbly, but some tightening of the wheel nuts and some hex hub tweaking will fix that. I think my Stampede
Going Forward - The Focus...
My focus for the Rustler will be high durability with an emphasis on weight reduction. In my mind Jang (UltimateRc.com), although a freaking RC genius, only began the Rusty diet with his modifications, and there is a lot more that could be done to truly end up with an even featherier-weight RC, but at what cost. Would the Rusty still be a good basher at that point. Not really my focus, I want a high speed basher for groomed surfaces.
My goal is a sense is to come close to what Jang did but with an eye more for durability, from a perspective everyone could accomplish, and do it less expensively. Many of Jang's
6/15/2006 - ...A striptease act - about 6 hours after receipt.
So Mozart the RC dog companion has physically approved the Rustler with a good 15 minute sniffing and is patiently waiting to give it a test run. Patience Mozilla,... patience. So it was along slow day at work and I just happened to have the Rusty
I have to say I am very happy with the condition of my Ebay find. There were a few other issues, which I am sure given the level of use on this MSC Rustler, the previous owner never even noticed. One of the sand stone resisters was cracked and
Since I am tacking on at the very least the Rooster and my old 15T Titanite, new antenna tube, RPM bumper, Dremeling the tranny housing to accommodate the motor heat sink, and fixing the above issues prior to it's maiden flight, I stripped everything that needed to go. MSC, servo, resisters, front bumper, two screws from the tranny, old antenna tube, and Stinger motor were removed to make room for the upgrades. The crappy sticker installations were all removed so that I can now apply my own unique and stylish stickers properly to the now virgin Traxxas Rustler body.
Other than that, all screws were tight, nothing seemed to be stripped, and the shock shafts all appeared to be straight and in good shape. Geez, this thing was barely used. Let's see if my lovely wife allows me some time tonight to get through the upgrades. Shouldn't take more than an hour or two.
6/16/2006 - ... Next Day and Maiden Voyage - Day 2
My lovely wife allowed me some time for some of the above upgrades, here what I accomplished:
Replaced missing axel pin
Replaced front carrier king pin, man that was REALLY bent.
Installed an RPM bumper
Installed the new super light aluminum replacement screws for the front and rear chassis screws to lighten things up right from the start.
Installed my old Novak Rooster ESC and a Trinity Titanite 15T motor.
Reinforced the motor mount with the old washer trick.
Modified battery tray for the easy pull battery straps and hopefully loose a couple ounces in the process with the elimination of some metal.
The rear end motor housing was modified to accommodate the Titanite's installed heat sink - again some weight reduction.
The front shock tower was replaced with a spare Traxxas Nitro shock tower laying around for strength.
A Novak 4700Mf cap was installed on the servo to give everything plenty of juice on lift offs.
The green crystals will stay for the moment.
The antenna was replaced with the only antenna tube left in my bulk pack, a really pretty pink one - seriously no black tubes but I have a pink one in there. The antenna was the right length so no replacement was necessary.
Same issue with the front camber links that I have seen on almost every Rustler and Stampede made. They are always about 1mm-2mm short and are never ever set for the tires to run at a neutral 90 degrees form the ground.
Floppy Antenna Fix.
The steering servo made that lovely grinding sound once tested so that also was replaced with the MSC speed control's servo (it's the same model) however I think I will be needing to replace those gears also with some FS-3003 gears as I think they are so much sturdier.
Lubed up everything with White Lightening wax lube.
With a freshly peaked battery pack, Mozart and I headed out to give the Ultra-Rusty a spin or a run as Mozart thinks of it. Woops, speed control servo needs to be reversed. Ahhh wait that is going way to slow. Need to reset the ESC. OK, zing, there is the 15T Titanite Mozart and I loved so much. Wow, huge difference between the brushless GTB 4.5R in the Stampede and now going back to this 15T brushed motor. Although I know my faithful Rooster and Titanite didn't seem slow before I went brushless and still has plenty of pep, it sure seems to crawl from torque and top speed perspective compared to the GTB system. Oh well, still lots of fun, the 15T Titanite is plenty punchy and I have a couple motors that need to be burned through before I can justify yet another brushless system.
How does it compare to the Ultra-Pede or a Stampede? Nothing can ever compare to the absolute bashing fun of the Traxxas Stampede, it goes almost anywhere and that flexibility is just cool. The ups are that the Rustler has much better steering, doesn't suffer from bump-steer as much, is much more controllable at speed, and corners like it is on rails compared to the stock Stampede - its more of a race truck. In its current state my Ultra-Pede still handles better although there is quite a bit of upgrade/tweaking potential on the Rustler that will eventually allow it to surpass the Ultra-Pede's handling. The downs are that a lot less clearance is noticed right away and it bogs down in grass much more that when running Dirt Paws even on the Ultra-Pede. Could be that the lower chassis adds just enough drag on the grass to slow it down to a crawl. That chassis bump up
What is apparent right away is that my Ultra-Pede is much lighter than this semi-stock Rustler. The Rusty was like a 400lb fat man on a sport bike, it wants to go fast but there is just too much weight to move and shift around. This thing is built as tough as the Stampede, and is overbuilt for it's task as a racing oriented RC. It needs some serious weight management assistance. Jang was absolutely right when he said the Stock Rustler is over fastened I see several screws that just seem plain redundant. My goal is going to be lightening things up without sacrificing durability. I can see where you could really make this thing feathery if you were not concerned about durability.
The tranny is nice and tight so, I am putting off the Idler gear upgrade until that breaks, the chassis and front A arms are getting seriously modified this weekend during the tear-down for the shock rebuild (they are way to soft). I do need some RPM Losi body mounts such as the one's Jang used or perhaps I can fashion some out of some spare body posts collecting dust. The RPM bumper is also getting some lightening as I think it too is a little over engineered. My fabricated Novak Rooster ESC mount from my Stampede kind of worked and needs to be recreated specially for the Rustler if it stays in that position. I would like to get the Rooster moved over and mounted over on the left chassis "fin", however currently it is slightly too wide to fit, so some additional engineering need to pondered so I can correct that issue.
6/17/2006 - ... Operation Rusty Liposuction.
Transforming a Traxxas Rustler into the Stampede Project Ultra-Rusty - Day 3
Today, I received notification from the Ebay seller that he will be issuing a $20 credit back to me. So the final tally is a Rustler that needed a few parts for $40 +shipping - considering what I am about to do, a good deal for a
Again part of my goal was to focus on modifications that almost anyone could do, however the task of lightening the chassis is where your talent and ability with a Dremel tool dictates the level of modification that can be tackled. I happen to be pretty good with the little sucker.
You have basically have two lightening options if you are so inclined or talented.
A. Cutting big chunks off the chassis which takes some talent to know what to cut.
B. Skeletonize or "Cheesing the Chassis" which in my experience has proven to provide a great balance between stiffness, durability, and weight reduction and is easier to do for most people.
The best option for the Dremel newbie is to simply Swiss Cheese the chassis with holes (hopefully with an attractive
Since it worked the first time for the Stampede Project Ultra-Pede, I carefully marked the location of all the holes to be drilled using a permanent marker and roughly drew lines of what was to be removed. Using my drill press and a 3/8" bit, I drilled the numerous holes in the Rustler's chassis which I will be completing the above described connecting the dots exercise with a Dremel cutting disk. It will definitely drop the weight of the chassis significantly and will hopefully still provide the durability that my driving style requires (I crash a lot).
The rear shock tower will get a few key holes punched in it and the RPM bumper will also have a few holes added. I am going from the tank like weight of the stock wheels to some black HPIs that should cut some ounces
Additionally, I am moving right to a Wide-Rusty conversion. Although the lateral cornering performance benefits are obvious, my goal is one of convenience in that I can use all my wheels and tires that I have laying around for the Ultra-Pede for some additional testing...and it looks really cool. Hopefully I can use the existing steering linkage as the new front camber links and use some left over tie rods from the Stampede for the new Steering linkage. The stock rear camber links look like they are tuned pretty well so they will stay. The front and rear A-Arms may go a slight diet, I will have to check, but I believe last I looked the rear arms actually weight less than the stock fronts, but don't quote me on that.
Let's see how much I can get done in 4 1/2 hours.
It's about 1:30AM and I am beat, my hands hurt, I have a burn mark on my forehead from a piece of molten plastic. I tore through all the planned upgrades with the exception of rebuilding the shocks. I was even able to dislodge the Dirt Hawg tires from their original glued stock wheel and re-glue them on a set of HPI (pics to follow) but ended up mounting my favorite Dirt Paws for the next morning's run. Gotta go to bed.
6/18/2006 - ... Testing the new Stampede Project Ultra-Rusty - Day 4
First off I have to say my hands hurt so bad they are cramping up from all the disassembly, Dremeling, sanding, molten plastic burns, cuts, assembly, tweaking, and upgrading - I did way to much modification yesterday. I really need a couple upgrade free days, but there is so much still to do and I hate to stop once I am on a roll.
The reality of all the modifications was incredible and immediately noticeable. The Rustler feels light and lively instead of a 20MPH plastic turd. Response and handling is much improved, the wide conversion made the Ultra-Rusty un-tippable and corners like it is on rails. The Dirt Paws in my mind are about 1000 percent better as a backyard lawn tire for the Rustler than the Dirt Hawgs. The Rustler would barely move in grass with the Hawgs, the Paws on the other hand shred and grip the grass and provide plenty of forward momentum. I think a new set of Proline Tractor Gators would be even better. The Hawgs are superior on gravel and concrete, so there is the trade off. If I had to pick only one tire, the Hawgs would be a good choice since the major surface the Rusty will likely see is concrete, gravel, or hard pack dirt. Had some problems with the 15T Titanite that are going to require a little maintenance. To expected because I basically yanked it out of the Ultra-Pede and jammed the 4.5R brushless setup without cleaning the Titanite.
I still need to get those shocks rebuilt, and do some finish work on the chassis to make it all pretty. That stock Rustler body is just freaking ugly in my opinion (sorry to everyone who likes it). Why the slammed Jato body is not available without all the holes is beyond me.
The wide conversion was a little interesting this time around and different. All I used was a 5mm pivot ball for the upper shock mounting and screwed it together with no binding issues, quick and simple. Perhaps it just seemed easier because I wasn't worried about adding a shock tower brace. I didn't need to shave the arms as previously done with the Ultra-Pede due to the fact that the Rustler does not have as much down travel so binding at that point is not an issue. I did however need to add an aluminum spacer under the captured ball at the Ackerman joint (stuff attached to the servo and upper chassis) to eliminate binding on the up-travel and the extra long steering carrier arms needed to have the extra trimmed off to prevent binding since the first hole is used (not an issue with RPM carriers). The stock steering links did not work as camber links, however I had spare turnbuckles from the Ultra-Pede that were a perfect fit for the camber and steering linkage.
As with the Stampede the stock servo is underpowered and should be upgraded to at the very least a high torque Traxxas servo (available on eBay for typically about $10-$15), so that will be a near future upgrade - hmmm may have one laying around somewhere.
Hopefully by this weekend I can find the time to rebuild the shocks and get some of the other miscellaneous upgrades done. All in all I think I am off to a spectacular start and already have one heck of a Traxxas Rustler that is patiently waiting for a brushless system. I may have to yank the Novak GTB 4.5R brushless system out of the Ultra-Pede temporarily to make sure that is the direction I am wanting to go. I may simple go with a re-manufacturered Novak SS5800 or a Feigao 380C sensorless motor - we will see.
6/21/2006 - ... Testing the new Stampede Project Ultra-Rusty - Day 7
Wow, 7 days.... only one week after receiving my Ebay prize and the Ultra-Pede is starting get into fighting shape. Chassis lightened, ESC and 15T motor, wide conversion, and today the shocks were rebuilt with Medium Heavy RPM 2-Stage pistons, 30 Wt oil, new seals, with my patented addition of a under piston shock ring and three on the external portion of the shock shafts to help ease the stress from hard landings, all topped off with Big Bore Aluminum shock caps. The Ultra-Rusty is looking good. The HPI rims do require a little shim on the front wheels so the wheel nut can tighten down correctly. Time for some play time tonight.
I am a dope. I have been jumping, and pressing the chassis pretty hard. Noticed today while rebuilding the shocks that I had been running without the forward two rear shock tower screws in. No damage, but could have been ugly - and disappointingly stupid.
The Jang emails Stampede Project - Shot an email over to The Jang yesterday and he responded. He clarified what he meant about structural strength of his Rustler. I think many people think he was saying that his chassis was not as strong as stock. That was not the case at all. What he was referring to was the A-arms, that he would not go as far with modifying those and although were fine for racing were not as strong as stock. Jang says his chassis is just fine for bashing. Jang went pretty far with his chassis modification, so I should be in the safe zone with my little experiment. One thing Jang did mention was that the long slots would appear to affect torsional rigidity, however if I didn't see any ill effects, go for it and thumbs up to me.
6/23/2006 - Ongoing Testing and tweaking. - Day 9
I am, in general, impressed with the stability of the Rustler. The Ultra-Rusty by comparison now handles substantially better. For everyone who is in the market for a almost un-tipable RC this thing is a blast. The big monster tires are great on the Stampede and allow wonderful wheelies and tons of ground clearance, but for a race oriented truck the Rustler is a nice step in the competitive direction. At the same time it steps away from being as versatile as the go anywhere Stampede. The Ultra-Pede will always be my go to truck, but I can see where the Ultra-Rusty could become a favorite on groomed surfaces.
Last night I noticed that I had a leaky front shock, appears I didn't use enough Teflon tape, so that one will have to be rebuilt. I was rushing a bit when I did the shocks, must have missed a groove or two with the tape. I am glad I went with the 30wt shock oil with the Medium Heavy RPM 2 stage pistons. I think the 50 wt oil I am using in the Ultra-Pede would be make
6/25/2006 - Ultra-Rusty goes Brushless - Day 11
I fixed the leaky shock and did little tweaking here and there on to make the Ultra-Rusty handle a little better. I Still fighting with the garbage servos that came with the Ebay find. The steering servo went crunch, the MSC servo is now going also. Even after a gear replacement they are not working properly. I would assume the previous owner's kid liked to hold it in full right or full left for 5 minutes at a time doing donuts, seen to remember that was how my wife broke my first set of servo gears. I may simply have to pony up and buy a at least a new high torque 2055 servo.
I ended up hi-jacking the Novak GTB 4.5R Brushless setup from the Ultra-Pede temporarily. In my opinion this is about as good as it gets for a ROAR race legal brushless setup for the Rusty (although the rumor is that Novak will be releasing an even faster 3.5R soon, no word on whether it will be race legal). The thought was that I need to know whether it's going to do the job or not before slapping down more cash, so why not do a test drive. I kind of wanted to see how the Rustler would handle the power.
Wonderfully by the way, but I am sensing that idler gear will need replacing quickly if I don't swap back to the 15T Brushed Titanite Motor quick. Again I was really expecting some wheelies with the 4.5R locked into the Ultra-Rusty's motor mount, but instead I experienced warp-like but controlled acceleration. The acceleration was fantastic, racing winning in fact, but in some way Novak's linear power curve took a little of fun out of the equation. The 4.5R is NOT a bashers motor for wheelies it really is purpose built for winning races. Kind of like trying to do donuts in the snow with your real car with the "Traction control" and "Vehicle stability control on". Sometimes you want to punch it and have the car launch forward in wheel spinning wheelie-ing madness the
Overall I really liked the 4.5R system on the Rustler and is probably what I will go with when it comes to that point. Although I would also consider a Reedy or Castle Creations system also, the GTB 4.5R is just a really nice efficient system that just works without having to pile on a bunch of batteries to se some power. I am going to play around with gearing a bit and have a little fun then it will go back on the Ultra-Pede where it belongs.
7/7/2006 - Idler Gear Replacement and Moving Forward.
A vacation and then a shredded idler gear from the torque of the GTB 4.5R stalled further testing and modifications on the Ultra-Rusty. The quick breakage really emphasizes the weakness of the idler gear on the Traxxas Rustler and Stampede. No big deal, $10 for a new aluminum idler gear, and the opportunity to work some magic on the differential with a Judy Butter repack. If you have perused my Ultra-Pede upgrades you know I use this mountain bike shock grease that is about the thickest stickiest grease I have found anywhere. It runs about $15 for a small container but turns the stock slippery differential into a limited slip dif without modification and usually only requires a once a year repack to maintain the stiffness.
The second 2015 stock servo is getting tossed in for a 2055 Traxxas high torque servo, and everything will be reassembled this time with the GTB 4.5R going back into the Ultra-Pede where it belongs and dropping the old tried and true 15T Titanite and Novak Rooster ESC back into the Ultra-Rusty for now.
I have been eyeballing some of Castle Creations Mamba Max brushless systems. Seems like a bit too much power for the Ultra-Pede as it wheelies out of control with the GTB right now anyway, so more power would just be stupid I think. I couldn't get the Rustler to wheelie with the GTB 4.5R so I am thinking that it could handle quite a bit more power before wheelies become a serious performance issue. The Mambo Max system looks like it could get the front wheels of the Ultra-Rusty up in the air pretty easily and should provide some nice 50+ MPH top speeds. Hmmmmm.....
7/20/2006 - Argggg, ... more crap not working...
Got the Ultra-Rusty all back together and the differential was acting all goofy alternating between a locked and un-locked state, something is binding in there and now I need to tear it all back apart...grrrrr. My fault should have checked it and cleaned it more thoroughly before reassembling.
Let's see, what else I have done lately. The Ultra-Rusty's shocks are now properly tuned with some new pre-load spacers and the new high torque 2055 Traxxas servo is turning the Ultra-Rusty better than ever. I had a spare Integrity fan from a motor heat sink than was added to the Novak Rooster ESC to keep things cool. Although I ranted about hating the fan on the GTB brushless setup it did work and keep the ESC cool, so we are going to give it a try on the old Rooster ESC that heats up a little after several runs and I may attempt running it with 7 cells that will add some heat to the ESC. I have heard of a more than a few people that are running 7 cells on the Rooster, but do have some thermal-ing shut down issues on occasion so perhaps the fan will help.
I also need to get a decent body on this thing, kind of embarrassing running around with a nude Rusty. I am thinking a buggy body with a big 1/8 scale wing.
Still need bearings and RPM carriers to improve the spin.
8/4/06 - Well everything is working just great.
After getting everything back together, the Ultra-Rusty is just chomping at the bit to get out to the track. Everything seems to be nicely tuned. Although it stills needs a body badly. But I suppose the old ugly Rustler body will work in a pinch. Funny I really like the Nitro Rustler body but hate the E-Rustler body.
Also Still waiting on Castle Creations to send me a Mamba Max 5700 or 7700 brushless test unit for review (hint... hint), however I think they have their hands full at the moment.
So where next on this beast. It's going to be a while on the next round of upgrades until I recover from my latest truck purchase. No not an RC, I just picked up a new real 1:1 truck and need to wait a month or so for my wallet to recover. I also have dumped some very serious time into a new Stampede Project creation - the Tri-Pede. A project which has garnered much of my attention and brain activity lately.
8/4/06 - Toto we are a long way from Kansas.
Thought I was going to do a simple update on a motor test, but got a little distracted by the opening image. Wow, the Ultra-Rusty has undergone quite a transformation, over the last couple months and now...it has a 550 motor installed. I know what you are thinking - "what the ....?" Well here is how it happened.
My concern in the Tri-Pede build was that my gear reduction was a little off and I still needed more torque in the tall grassy areas and I was already geared 12/87 so there wasn't really any further to go for adjustment. I ran across something that will prove quite useful - a Trinity 550 Monster Max Wild 17 Turn motor sitting in the clearance bin for $25 (not bad considering it's a $70 motor). Traxxas is now using a 550 12 Turn on an ESC that has about the same specs as my Novak Rooster, so why not. It turns out that this is a freaking torque monster and has the RPM of a tractor motor. In testing it worked awesome in the Ultra-Rusty geared at a crazy 30/84 with alls sorts of speed and torque and the ESC wasn't even warm. I should finally be able to gear down the Tri-Pede for a little more torque and my runtimes "should" be a little better also due to the low current demand of this 14.4V motor. For a little more fun I could easily drop another cell into the battery system without stressing the ESC or motor.
Ultra-Rusty with a 550 Monster Maxx 550 Wild 17T motor geared 26/87 - Video Here (.WMV video) This was a very quick video pieced together to show what a 550 could do in a Rustler.
So anyway back to the Ultra-Rusty and this crazy oversized motor... it's pretty amazing with the available torque and it makes me definitely want to give Traxxas 12T 550 a shot when it comes out. Although the speed is about the same as my 15 Turn Titanite when geared a 28/84 the torque is amazing and starts from 0 and the 14.4V 550 isn't even breaking a sweat. Another thing I noticed was more fluid control, even when compared to the 19T Stock Stinger. Not a lot of RPM to play around with but the power delivery was really smooth almost like my brushless GTB system from Novak. The torque is extremely linear from bottom to top RPM, whereas the ProAmber 17T and 15T Titanite seems to trail off as the RPMs increase. This may be that I am only delivering 50% of the voltage this thing can take or I may really be it it's sweet
The Ultra-Rusty is also very tired of being all naked, so I am working on a new body. I WAS going to pick up a crowd pleaser or buggy body, but I think the Ultra-Rusty needs something a little more interesting. I saw a picture of this Tenth Technology X10 European made truggy (above) that looked like a Lockheed Martin F117A Nighthawk stealth fighter with four wheels or at least something a Ninja would drive, so I think I am going to get out the plastic and see if I can devise a cool looking body that looks stealth'ish.
Although not as sweet at that above $500 X10, here is what I came up with. The front holds itself under the front shock tower. The rear will be held with RPM body mounts mounted to the rear shock tower.
8/4/06 - Spring Swapping.
This is not as sick as it sounds. During the piece together of the Tri-Pede, I realized I had over a 1/2" of pre-load spacers on the front shocks (noting that you need this many on the stock fronts after a "Wide" conversion). I also noticed that I was in need of shorter springs on the Tri-Pede and longer ones on the Ultra-Rusty, so I swapped the XL springs on the front Tri-Pede for the shorter springs on the Rustler and vise versa. The result was the Ultra-Rusty being almost perfectly tuned in the front with more spring tension and the Tri-Pede sitting at normal ride height after internal shock extension limiters were installed. Now that worked out nicely didn't it.
9/19/06 - Mamba Max X 3
My new best friends at Castle Creations provided me with the opportunity to review all three Mamba Max motors and the controller. My primary testing vehicle will be the Ultra-Rusty. Here on some pictures. My review will require a little waiting - RC Car liked the review so much it will be in featured in an upcoming issue and I need to wait for publication to run before I post the article here. Let's just say I was very impressed and the 5700 is staying bolting into the Ultra-Rusty permanently.
10/11/06 - Full 5x11 bearing upgrade and more packs...
A little over a month ago I happened across some of the Traxxas replacement bearings for about $10 in the clearance bin. These are the really small bearing sets that are direct replacements for the stock bushings. Never tried them and they were cheap so I gave them a spin so to speak. Although they seemed very promising at first, they were trashed within a couple runs once I started testing the Castle Creations systems with 50+MPH speeds. I was back at the hobby shop to find the RPM carriers and the much more rugged 5x11mm Green Seal Boca bearing sets that have served me well on the Ultra-Pede. Just so you know, real bearings are worth the extra expense.
I picked us some DuraTrax body posts and finally made real mounts for the body I pieced together.
Although I am not sure whether it's true or not, I heard Radio Shack was discontinuing the GP3300s from their stores. I am know the proud owner of 4 GP3300 packs rebuilt with Deans Probar 3s, Wet Noodle power wires, and connectors. My 4+ year old battery packs are definitely fading fast and need to be replaced. For under $30 rebuilt to side-by-side packs, the
There I stood at the hobby shop with a new set of HPI wheels (black of course), and debated for a hour on whether I needed a set of the Step Pin Losi Reds, or Proline Step Hexs. The more I stood there, the ambivalent I became about what to get. Masher 2Ks for bashing? No already have a Stampede for that chore. Tractor Gators for the Golf Course? Kind of single use tires. So the Step Pins? No, probably won't get any use out of them - expecting snow this weekend. Have Paddles, have Dirt Hawgs, Have Dirt Paws, all tires that need to see more wear before I can justify replacements. The only tires I was really tempted to get was a set of the Road Rage tires for speed testing the Mamba systems, but in all honesty the Dirt Hawg were multitasking marvels that seemed to be working. New tires will have to wait...
10/19/06 - Getting Red and Green
So my wonderful wife hands me about $40 and says go blow this on something, you have been working hard and deserve some fun money...I love my wife.
Still thinking about a new set of tires and wheels, I stumble into the hobby shop and start cruising the isles. Geolanders, Losi Step Pins, Dirt Works .... ohh Jato 2.5 tires, the same ambivalence I felt last shopping trip starts to set in over deciding on tires and I move over to the candy counter.
A "candy counter" is in every hobby shop, it's the place where all those R/C accessories that have the price tags of jewelry set beautifully displayed and safely out of the grasp of thieves. I spy the red anodized aluminum linkage six pack of "tubes" for the Jato. I knew the Jato Camber links were a direct fit front and rear
Although the Ultra-Rusty' stock sprung suspension was great for bashing, I needed some softer springs for a more track oriented suspension setting and that happened to be two sets of rear Losi Red springs. With the wide conversion you need the longer springs in front. I know most people run the next softer rate, but with the extra weight the Ultra-Rusty hauls occasionally running 12 cells, the Red version should work a little better. Don't know how it will run but the Ultra-Rusty sure looks pretty with the green Mamba Max motor and all red linkages.
10/19/06 - King pining and Weighing my work.
For some reason I have been extraordinarily lazy about getting my kingpins installed. So today I was able to get the last two on front dropped in. My problem is although I have occasionally bend a stock pivot pin, I haven't been plagued with them working themselves out on my Ultra-Pede or the Ultra-Rusty like others have experienced. I guess you could say I haven't been sufficiently motivated to make the change a priority.
With the Jang's 3.02 lbs. being a lofty original goal, I decided it was time to throw the Ultra-Rusty on my digital kitchen scale and figure out where it weighted in. First let me say the Ultra-Rusty is a different purpose built animal than Jang's waif like racing Rustler. Mine was built for bashing durability, speed, my amusement, and on occasion, racing. I was pleasantly surprised that with all my upgrades that that were actually adding weight such as a wide conversion, nitro Rusty shock tower, full bearing and carriers, adjustable camber links, high torque servo, diff ball slipper, and the Mamba Max brushless system, just to name a few, the Ultra-Rusty weighed in ready to roll at 3.40 lbs (without the battery) and just under stock weight. I guess my method of "Cheesing the Chassis" and trimming the transmission housing really worked and balanced out the weight additions nicely. There is still a ton I can do if I want to start trimming arms, leaving out redundant screws, drop the RPM bumper, and loose the front wing, and the biggy switch from the heavy weight Dirt Hawgs to more race oriented lighter tires. Some of those weight reductions I just don't think I will do, because as the Ultra-Rusty is cart wheeling after a 50+MPH mishap, I do need the extra strength and durability that those extra ounces provide.
10/20/06 - Joining the 60+ MPH club with the help of Castle Creations....How Fast?
The answer is 61.34 MPH with a Castle Creations Mamba Max 5700 brushless motor system powered by 12 GP3300 cells geared at 22/87, it hit over 50+MPH with the 4600 installed and running 12 cells, and max'ed out at over 40+ MPH with the 7700 on 6 cells.
For your information, 40 MPH is too fast in reality to control even a very well tuned Rustler such as mine. At over 60 MPH, driving is more a lesson on guiding an R/C missle now traveling at illegal speeds, riding on the pancaked edges of tires (which have flattened from the RPM and centrifugal forces and have no business whatsoever rolling anything that fast), all while making sure you don't crash, hit something, or outrun your transmitter (which is a very big challenge). Although the record is143MPH for an R/C car, if I remember correctly, I simply cannot imagine how you would maintain control of an R/C at those speeds.
I have a little deserted dead end stretch of road that I can use for speed testing to keep things safe. Doing these speed runs are very dangerous to the R/C and can be very dangerous personally as well. Bad things can happen indeed if you or someone else is hit by your R/C at this point. I had a couple scares from lost of control as the Ultra-Rusty was hurdling at me at over 50 MPH. I did manage to break the Ackerman linkage, again for the fourth time, simply by running into tall soft weeds at over 50 MPH, this should emphasize how easily damage can happen at these higher speeds.
My next attempt will be to get over 70MPH, if it can even be done with the Mamba Max system. I have seen and heard of a number of people getting well into the mid 60s with the 5700 and 7700 so what I did was nothing new. With the right non-ballooning wheels, a slippery body, and some better batteries (either higher Mh or going to LiPo), I think 70MPH may be attainable, but that may have to wait until spring as Omaha is starting to see snow already. My hope is for a long Indian summer to do some additional testing.
How Fast?
Three different GPS units verified the speeds in the Ultra-Rusty, with the appropriate Mamba Max motors installed, running re-built high current side-by-side 6-cell GP3300 batteries with Dean ProBar3s, plugs, and wires. I have no doubt that further gear tweaking and better batteries would result in higher speeds, 70MPH may not be out of the question. My biggest problem was that I kept outrunning my transmitter.
MOTOR GEARING CELLS MPH Next closest MPH
4600Kv 26/87 12 53.8 52.17
5700Kv 22/87 12 61.34 60.39
5700Kv 26/87 12 55.89 54.22
7700Kv 15/87 6 38.58 38.11
7700Kv 18/87 6 42.86 41.93
7700Kv 26/87 6 37.88 37.29
No comments:
Post a Comment