Stretched chassis revo based large scale on roader - Page 2 - RC-Monster Forums

What's_nitro? · 06.03.2009, 11:05 AM

Linc I was just thinking it would be really cool if the truck had a working tailgate on it!

Overdriven · 08:48 PM

Very cool linc. Nice to see another stretch coming together. The body maybe FG size, but its not FG, Firehammer maybe?. FG has the front grill/headlights in a separate section that bolts on to the main body. Cool body either way, I'm digging the scale street truck look. When my 1/5 e-revo is done more scale looking project is in my future.

lincpimp · 12.15.2010, 02:19 AM

Back on this after a year or so... Thinking a CC 1520 motor on 6s lipo... Or maybe hv something or other, hell I could go 8s with the 1520 motor.

Need to get the tranny mounted and see how it goes from there. Plan to have all the evenings free between xnas and new year. Hope I can get some work done on this and the 7th scale lighning street.

lincpimp · 12.15.2010, 02:24 AM

Ok, have a choice between the old emaxx tranny setup as a single speed or an e savage tranny I have laying around. Pretty sure the old emaxx tranny will be stronger.

Here are the speed calc numbers:

E Sav tranny:

Differential Ratio: 3.3076923076923075
Transmission Ratio: 1.736842105263158
Other Ratio: 1
Spur Tooth Count: 46
Pinion Tooth Count: 25
Total Voltage: 22.20
Motor KV: 1577
Tire Diameter (inches): 5.5
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor Coil Resistance: 0.008
Spur/Pinion Ratio: 1.84 : 1
Total Ratio: 10.57069 : 1
Tire Circumference (inches): 17.28 inches (438.88 mm)
Rollout: 1.63:1
Total Motor Speed: 35009.4 RPM
Vehicle Speed: 54.19 mph (87.05 km/h)
Effective KV Value: 1577

Old Emaxx tranny:

Differential Ratio: 3.3076923076923075
Transmission Ratio: 1.7222222222222223
Other Ratio: 1
Spur Tooth Count: 46
Pinion Tooth Count: 25
Total Voltage: 22.20
Motor KV: 1577
Tire Diameter (inches): 5.5
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor Coil Resistance: 0.008
Spur/Pinion Ratio: 1.84 : 1
Total Ratio: 10.48171 : 1
Tire Circumference (inches): 17.28 inches (438.88 mm)
Rollout: 1.65:1
Total Motor Speed: 35009.4 RPM
Vehicle Speed: 54.65 mph (87.79 km/h)
Effective KV Value: 1577

Not much difference, so I will likely stick with the emaxx tranny with the gmaxx single speed setup. Need to dig this stuff up. Found my rcm hybrid cases earlier so I just need to scare up some diffs. Might just make the rear driveshaft out of some cut and glued revo sliders.

Overdriven · 12.15.2010, 09:36 AM

Wow, digging up the old projects! Wasn't this one up for sale at one point? Personally I'd keep it Traxxas with the Maxx tranny.

I did the cut and paste thing for the driveshafts on my stretch chassis Revo, it worked well. Except for the one shaft that came out of the mold bad from the factory, didn't notice it until it slapping the chassis from being out of balance. The thick shafts normally for the wheels will work in the rear. For the front and the lack of room the steering assembly makes, have to use the thinner shafts. Up front mine was double the length and it held up great.

lincpimp · 12.15.2010, 11:20 AM

Quote:

Originally Posted by Overdriven

Wow, digging up the old projects! Wasn't this one up for sale at one point? Personally I'd keep it Traxxas with the Maxx tranny.

I did the cut and paste thing for the driveshafts on my stretch chassis Revo, it worked well. Except for the one shaft that came out of the mold bad from the factory, didn't notice it until it slapping the chassis from being out of balance. The thick shafts normally for the wheels will work in the rear. For the front and the lack of room the steering assembly makes, have to use the thinner shafts. Up front mine was double the length and it held up great.

Yep. no one wanted it so I figured I would finish it up.

I think the revo driveshafts will work fine, just need to make sure they are straight so I do not have the issue you had.

mac3194 · 12.15.2010, 06:33 PM

looks great!! i wish i had skills like that lol

coolhandcountry · 12.15.2010, 07:13 PM

I am interested to see it closer to finished product.
Looks good so far.

lincpimp · 12.16.2010, 12:02 AM

Quote:

Originally Posted by mac3194

looks great!! i wish i had skills like that lol

Not that difficult, give it a try! Making the tubular roll cage and body mount will be fun... Probably going to use thicker brake tubing and try to bend as much as possible. Welding tube that small is fun...

Quote:

Originally Posted by coolhandcountry

I am interested to see it closer to finished product.
Looks good so far.

Me too. Just need some time. Kitchen remodel is coming to a close so I will have more free time.

mac3194 · 12.16.2010, 11:39 PM

my next build would probably be a 1/5 scale truggy?? shouldn't be so difficult i like making custom 5th scales. im only able to make thing like this because im in vocational machine shop at my HS and next year i am gonna have 3hrs a day to machine anything i want.

lincpimp · 12.17.2010, 12:09 AM

I have plans for a 6th scale or so buggy based on lst suspension. Even have some nice big al channel to make a chassis out of. Would like to do 4wd, and I have a 1717 coming for this build.

lincpimp · 08.20.2014, 12:28 PM

Back on this, 4.5+ years later!!!

Currently cleaning and sifting thru my stash of revo parts.

Since this is going on road and will not need a lot of suspension travel which rocker should I use?

I have decided to use a nitro revo trans, as I have one that is already locked in 2nd gear. And it will bolt right in.

I have ordered 2 heavy duty revo diff cups so I can assemble a pair of 3.3/brushless spec diffs. Given the tire size and use I did not think I really needed to go with a heavier duty diff. The loads from an on road vehicle with smaller tires, etc will be a lot less than a monster truck.

Still undecided on the power system. Need to run some numbers on the various motors that I have. I do have a MMM and a sidewinder 8th esc so 5-6s lipo for power.

lincpimp · 08.20.2014, 12:40 PM

Had a look and I happen to have a Feigao 14xl motor, 1191 kv. Also have a rcm heatsink/clamp...

Here is the speedcalc:

Differential Ratio: 2.8461538461538462
Transmission Ratio: 2.2941176470588233
Other Ratio: 1
Spur Tooth Count: 36
Pinion Tooth Count: 22
Total Voltage: 22.20
Motor KV: 1191
Tire Diameter (inches): 5.5
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor Coil Resistance: 0
Spur/Pinion Ratio: 1.64 : 1
Total Ratio: 10.68449 : 1
Tire Circumference (inches): 17.28 inches (438.88 mm)
Rollout: 1.62:1
Total Motor Speed: 26440.2 RPM
Vehicle Speed: 40.49 mph (65.04 km/h)

Load on the motor might be too much? Motor rpm under 30k, and the primary gearing is high at 1.64:1. Dunno, guess I will give it a try. Total weight should not be too bad considering the size.

Manne · 08.27.2014, 02:20 PM

Nice! Keep going I really like to see this project finished

I´ve had a bunch of feigao´s... They always seem to run hot

. I vote like you, give it a try and see if it goes lava

lincpimp · 08.27.2014, 04:31 PM

Thanks, I would like to see it done too!!!

I may put the feigao in my slayer pro build and pickup a complete sidewinder 8th system for this project.

I have the rear mostly built, need to clean the front parts and assemble that.

I was looking at the rear center driveshaft length. Looking like I need to make a carrier bearing and then use a pair of revo wheel driveshafts to transfer power to the rear diff.