4WD SRB Racer

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1300GT
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4WD SRB Racer

Post by 1300GT »

This is something I've wanted to make for a long time now. As the pictures show it's early days yet and I've got a long way to go.

I haven't decided on a front gearbox but I have a couple of options available. Unfortunately no MIP front gearbox.

So far the specs are,
-Adjustable front track from stock SRB to 12mm wider and then out to 24mm wider than stock.
-The rear track can be widened 16mm.
-Kyosho Circuit 1000 semi trailing arms on the rear.
-SRB front suspension.
-SRB rear gearbox.
-Wheelbase stretched by an inch.
-The chassis is made from 1/8 of an inch thick G10.
-Kyosho Stinger MK1 ladder chain and Kyosho Blizzard sprockets.

I'll update as I can and we'll see what happens. :)

Any questions, feel free to ask.
Attachments
4WD SRB Racer.jpg
4WD SRB Racer 1.jpg
4WD SRB Racer 2.jpg
4WD SRB Racer 3.jpg
Chris.

Toys.............they are!

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Re: 4WD SRB Racer

Post by Jirka »

:shock: I do not have questions but what a cool project 8) ! I hope You find suitable front gear box soon. Longitudinal trailing arms front and rear with 4wd drive in 1:10 scale. Is that ever made before?

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Re: 4WD SRB Racer

Post by tiger1 »

exciting :)

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Re: 4WD SRB Racer

Post by RC104ever »

Why not get an aluminum chassis? I think I bought mine off ebay, works great. I also have the RCchannel independent rear suspension setup, works great.
- Chris
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Re: 4WD SRB Racer

Post by terry.sc »

Jirka wrote::shock: I do not have questions but what a cool project 8) ! I hope You find suitable front gear box soon. Longitudinal trailing arms front and rear with 4wd drive in 1:10 scale. Is that ever made before?

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Re: 4WD SRB Racer

Post by shodog »

good luck on your project. I look forward to seeing the end result

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Re: 4WD SRB Racer

Post by tamiyadan »

.

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Re: 4WD SRB Racer

Post by DennisM »

Great project 8)
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Re: 4WD SRB Racer

Post by 1300GT »

Thanks for the comments everyone. Much appreciated. :)
RC104ever wrote:Why not get an aluminum chassis? I think I bought mine off ebay, works great. I also have the RCchannel independent rear suspension setup, works great.
Chris, I have a large sheet of G10 sitting around and wanted to use some of it. And I needed a chassis that is longer than stock and wider in the front than stock. I could have used aluminium but I prefer the look of the G10 and being 1/8 of an inch thick it doesn't flex too much.

The RCchannel rear suspension kit is nice but I wanted semi trailing arms for this buggy and I had a spare pair of Scorpion rear arms.
tamiyadan wrote:a kyosho progress or Gallop front gear box would work there as well, it is very self contained, similar to the mip design.
or you could mill something out of plastic or metal, or 3d print something,, spool the front gear box to make it simpler.
could then use one way bearings on the rims so they free wheel forward on the front axles.
Dan, thanks for the input. I plan on making it full time 4WD for now but the RWD front wheel assist would be interesting to try out one day.
Chris.

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Re: 4WD SRB Racer

Post by tamiyadan »

.

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Re: 4WD SRB Racer

Post by SMOKE-DOG »

Looks sweet. Love these kind of projects. Are you going to keep all the parts vintage or will you also use some modern parts?

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Re: 4WD SRB Racer

Post by 1300GT »

SMOKE-DOG wrote:Looks sweet. Love these kind of projects. Are you going to keep all the parts vintage or will you also use some modern parts?
Thanks SD. It's going to be a mix of vintage and modern parts plus some custom home made stuff.

Ideally it would be mostly vintage, but as it's going to be run I don't mind using some rere parts.
tamiyadan wrote:you have a few ways you could attempt it, mount the front or rear chain sprocket on a one way bearing like tamiya did on the CC or TA chassis; locate the one way in the front rims or setup the front drive gearbox with 2 one ways and separated outdrives you would need a larger hollow tube with the bearings inside and a split shaft to carry power to the front tires.
years ago, i hacked 2 gearboxes on a SRB chassis and ran 2 motor front and rear, the front steering radius was basically non-existent, it was stupid and heavy as well.

if you can match sprocket ratios you could grab many parts from the kyosho optima to speed things along. parts from the Kyosho/Cox/robbe S-10 Chevy would be adaptable as well, that electric truck and the datsun gas version used front one ways mounted in the rims as well.
Dan, I've been checking out one way bearings now. I like the idea of the one ways in the front rims. Seems easy enough to do with the sizes available.
Chris.

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Re: 4WD SRB Racer

Post by tamiyadan »

.

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Re: 4WD SRB Racer

Post by 1300GT »

I had a look at the manual Dan. If I use a single shaft and sprocket the front wheels will be rotating in reverse against the rear wheels on my buggy. I need a gearbox with a top shaft and final drive gear/diff for the front end. Thanks for the link though.

I'm going to have a go at making a front gearbox that uses an SRB top shaft and final drive gear. That'll keep both gearboxes driven equally with a 2:1 internal ratio.
Chris.

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Re: 4WD SRB Racer

Post by GoMachV »

Even tho the idler is just an idler, when you drive off it for the front you need the front to have the same ratio as the rear idler to lower gear, not top shaft to lower gear. It will make more sense when you draw it out :mrgreen:
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