Stampede at 8s - RC-Monster Forums

crazyjr · **Stampede at 8s -** 05.27.2007, 01:24 PM

I got the parts laying around to attempt this, except for the batteries. I got all the hop ups to make the stampede handle the power (all FLM with the steel gears). my plan is to run my Lehner XL1200 with an MGM 16024 and start with 6s to start, with 8S later on. I realize it will be very powerful and the stampede might not be the best platform, but i thought if i did it with a rustler it wouldn't be as interesting. I am still planning to do a B5 1/5 buggy, but haven't found a roller yet

Does anyone know what the supposed speed record for stampedes is? Also, Does anyone know the most Voltage run in a stampede is?

Almost forgot, the plan is to run 2200 flight powers to keep the weight down. I will run them under the chassis with a CF skid plate for protection

I would like opinions on the batteries please, in 6s and 8s will they be ok and not stressed too bad

aqwut · 05.27.2007, 01:55 PM

Good luck dude.. but 8S on a stampede.. :) atleast it will be efficient...

BP-Revo · 05.27.2007, 02:14 PM

I just hope you got a feather light throttle finger. Good luck man.

2FastSS4U · 05.27.2007, 06:54 PM

Nuts!

jnev · 05.27.2007, 06:56 PM

That will be crazy!! But good luck. This is an order: take pictures and video.:)

crazyjr · 05.27.2007, 07:51 PM

thanks, I still need an answer from the gurus about the flightpower 2200 batteries. they will probably be the 20c versions as thats what the local plane shop has

crazyjr · 05.31.2007, 01:01 AM

This project is on hold indefinetly, I want to fab up a set of bellcranks for it to stop some of the bumpsteer, for stability reasons. For that reason it will be on a backburner till i figure out how i can do the steering right. Its either this or a vid of me picking up pieces of the stampede from a speed run

05.31.2007, 01:19 AM

I don't know. I'd kind of like to see the vid. LOL

ClodMaxx · 05.31.2007, 01:27 AM

you could always try adjusting the steering exponential on your radio. brianG can talk this more intelligently than i can, but i have my spektrum set up so that fairly major steering movements to the wheel are only minor on the car (so my maxx can be doing 35 and a sudden slight movement to the tx doesn't send the truck careening into a ditch, lol). but on 6 or 8s? i'm not sure that would be an answer. only help.

BP-Revo · 05.31.2007, 01:51 AM

Yea, I have found high speed stuff really takes alot of steering tuning to stay in control.

I tweaked my G2R's steering both on the truck and on my radio so that it has a linear steering feel, even with the natural exponential created by the geometries. This makes it alot more controllable and predictable.

Suspension is also a huge factor. Doing 40 in my G2R is no problem, doing 40 or so on my 2.5R (when it had my buddy's 3.3 in it) felt very scary.

However, I'll keep my eye on this project. I've always wanted to do some high voltage stuff myself. :D

hyperasus · 05.31.2007, 03:11 AM

I've run my XL1200 in my pede on 4cell......even on 4 cell it's a hell of alot faster then most would think. My opinion is that even with a 12t pinion 8 cell will be comical at best. It's just so much torque for a 2wd. Running mine of 4 cell was kinda difficult because of the torque, just next to impossible to keep the nose down. Even the slightest touch on the throttle and it turned in to a wheelie king. But then again, who knows what's possible if you get that COG down and get some lead weights up front.

captain harlock · 05.31.2007, 07:41 AM

You should know that speed will be around 90mph or even more.
This project makes me feel sick.
Good luck, though.

crazyjr · 05.31.2007, 08:43 AM

Well, the whole project was going to be an efficiency experiment (ultra-lightweight high voltage) but with the stability problems with the stampede setup, I don't see it happening without a bellcrank setup. I have a thundertech outlaw chassis with the cageand cantilever rear shock mount, and it has a bellcrank set, so i might start with it. I am also thinking i can use one of my Traxxas Blue eagle trannies so i can have an alumnium motorplate as well

crazyjr · 10:26 AM

Quote:

Originally Posted by captain harlock

You should know that speed will be around 90mph or even more.
This project makes me feel sick.
Good luck, though.

Actually, it will depend on gearing. I used a calculator and know the 1200XL will be at about 35,500 at 8s lipo and 26,600, at 6s, so gearing will determine speed. However, with the power potential, speeds might be near unlimited. this kind of potential would be intresting in a pan car

hyperasus · 05.31.2007, 02:23 PM

LOL

You can use the calculator all you want. But if you take you're typical 4600kv x 7.4volts = 34,000 rmps, now you take 1200kv x 29volts(roughly 8s lipo) = 3600kv. All looks great on paper, but soon as you actually try it you will find out the 1200kv on 8s will be so fricken much faster then the 4600 on 2s you'll think the calculator is broke. In fact, if you take a 4600 on 3s(51,000rpm), vs the 1200kv on 6s(26,600rpm), that 1200kv on 6s will be way the hell faster then then the 4600 on 3s. I know it goes against the R/C calculator but you just try it and see for yourself. It's like those higher kv motors are just lugging out everywhere they go so you cant really compare them with a calculator.