Lowering BL Revo CoG.
 

After getting back from the race weekend I have decided to lower the center of gravity on the truck. First by using dual 3s packs instead of one on the right side, in their own lower batt mounts/trays lowered about an inch down; moving, and flipping the transmission around and lowering the motor on a separate motor mount in front of it, and moving down more than an inch as well.

I don't know where to put the speed control, and maybe I don't want to move it, but as for the receiver box, I am totally open to suggestions as to where to put it. The Rx box will be a RPM unit, maybe above the rear shocks?

As far as I can see it, this way, there will be the perfect front/rear distribution, as well as near 50/50 side-side balance.

Does anyone have any experience modifying a Revo chassis for lower CG, and dual packs? I have two weeks to fabricate the mounts and do all that is needed.

Another.

The OG 50/50 revo.....lol

http://www.rc-monster.com/forum/showthread.php?t=19479

http://www.rc-monster.com/forum/showthread.php?t=218

Try that, or have a glance through the build in this thread:

http://www.beatyourtruck.com/forum/s...ad.php?t=58732

Nice setup. What does OG mean? :smile::neutral:

So you say that setup will keep up with the truggies, that's great. The current setup, I can get a better average lap time than half the truggy drivers on our track, and that's with a HIGH CoG setup as well.

I'm kinda seeing where this is going, the whole trying to lower the CG, where does it end? You know?! At some point, it's just a truggy really, and can run with the truggies.

What battery trays are those? Impakt RC? I am thinking of using 1.5 inch carbon fiber angle on each side.

I am just wondering if it's better to lay the packs down for lowest possible CoG, or to stand them on edge to keep them more center lined?

What packs are you using these days, btw? As you can see, I am using a pair of 3s, 4200, 35C G3 packs, love em, getting another pair soon.

Does anyone know of a good source for carbon fiber products? Such as angle, sheets, tubes, etc?

I found robot marketplace, but not the best selection of sizes.

hobbycity has some carbon fiber... alot actually

OG=Original Gangster

Have you thought of making some type of bottom tray like the GorillaMaxx chassis incorporate?

FullForceRC sell CF sheets too:

http://www.fullforcerc.com/Carbon.htm

As for stuff like angle, I would google for it- lots of obsure companies turn up that should be useful.

OG, right, I knew that, just testing you guys. :whistle:

Checked out hobbycity for angle, nada. Too bad, the CF there is inexpensive.

Nitrostarter, I thought about a bottom plate, but I am just not sure how I would attach it, and the battery mounts would not be angled up, which you need to protect them, and to reduce snagging on jumps, bumps, and large lumps if they were on the track. But the idea really interests me as it would provide a skid plate effect, and even protecting the steering servo when landing on a spike in the cribbing off a jump (don't ask ;) ).

K, now that I have several CF sources... it's either a bottom plate, or twin angle CF off each side, which just might work better, but who knows.

Is there a place that you can order CF with custom bends in it? Shapes? Cuz you need those batt trays to angle up to reduce snagging when landing off kilter.

Any ideas are welcome, and pics as well!

cheers

You can heat up CF and reshape it (over a wooden mold for example), though its not as good as a piece that was laid wet into a mold and pre-formed to the required angle. Still, worth thinking about, maybe even prototyping with a cheap piece of CF, test it and see how it holds up, before deciding on a more expensive piece of CF etc..

Hmm, I don't think I would come up with anything aesthetically pleasing if I heated and bent it myself. :oops:

I really like the way Dafni did his batt mounts, only with CF like with Serum's Revo 2.5 conversion.

How low does the GM Revo chassis go, was it all the way down to skidplate level? I wonder why they stopped selling them? Just because the E-Revo came out?

HERE is the CF angle I was looking at, looks like a good size, although I would prefer a 2" size, this is 1.5". So if this is the biggest CF angle I can find, I would have to set the batteries on edge as to avoid the packs sitting over the edge and getting abused. Then all I would need is sticky velcro where the pack would sit, and two velcro straps, and that should do the trick.

What do you think of this motor? I know Sike should be here now to give a brew some experienced suggestions.

http://www.scorpionsystem.com/catalo...s40/S-4025-16/

Scorpion outrunner:

332Kv.
14 poles
2000watts continuous? seems high for cont.
8s max

Would run 6s, that works out to 47mph, not a whole heck of alot higher top speed than it is now, ~42mph, but non the less, should be less, maybe around 280 - 300 Kv. would be nice.

Sike, would you recommend an outrunner for racing? Are you still using the outrunner in your truck?

All the conversions i have done i have used 4 electronic kitchen scales put one tyre on each and than moved stuff around to get as good a weight balance as i could.