Compact gearbox for the 22

[RC-trix]

I've recently bought a second hand 22-despite people warning me about it being hard to set up in mid-motor configuration.
What I did notice was that the motor was a lot more forward than the norm, which might explain the aformentioned.

So I figured it might be worth messing about a bit with the weight-distribution.
Hence the idea to make a more compact gear-box as a means of achieving this, without having to resort to a radical redesign of the entire car.

The design :



The motor is +/- 15mm more rearward; as an unfortunate side-effect, it’s also +/-8mm higher,
so my idea might actually have an adverse effect on handling.

So far, I’ve got it 3d-printed, (printed with heated filament wire ) Helas the quality of the print is so poor it barely allows me to check my dimensions ….


I’ve requested prices to get a more decent print, but I think it’s going to cost me an arm and a leg..

If anybody’s got any comments on the idea itself or how to get a decent quality print, I’ll be glad to listen

Steven

[rcjunky]

I think you have the right idea. I fliped the rear arms around on mine to move the wheels forward to a normal length and more rear weight, but I think you're on to something a bit better. I don't think that having the motor a bit higher will have a big negative affect, I think moving it back will far out weigh the high CG

[mark christopher]

have you tried atomic carbon on here for 3d printing

[RC-trix]

Not yet, it's "old-timer" isn't it - would he be willing to help for a fee ?
He himself is selling the tardis but it's worth a PM of course

[super__dan]

I'm not sure I'd be keen on 8mm higher!

[vrooom]

nows there is nice idea. surely with new motor plate or something, you could place the motor lower?

[naomiswanson]

As far as I know, we have different types of gearboxes. But my mind is always bothered by this question. How does the car gearboxes works? Will you please give me some specific details of what are the functions of each gearboxes.

[Swell]

Great stuff i hope it works i loved my 22 but couldnt just control it as a learner,
And got sick of being told to get rid, the quality of the car is great, it would do the car justice if you can pull it off best of luck

[cunawarit]

That looks great, its really cool to see people trying more radical mods like this with 3D printing

Let me just say that I am quite new at RC racing, but part of me wonders if with this admittedly incredibly cool part you are simply swapping one issue for another. The much higher motor mounting position could cause a number of other issues.

Now let me ask something that to some may be obvious, but isn't to me. Why would this compact gearbox be better than the Cream Extreme RC rear weight or even the mid-motor rear weight kit? Seems to me like the weights allow you to move the weight balance rearwards without increasing the CG... But as I said, I may be missing something super obvious somewhere.

[Moose]

8mm higher motor offers some intersting options to put in the speedo and battery. Looks great! 8mm higher motor is much weight but looking at s ome rear weight kits and alloy gear cases they to the same. Maybe 4mm would be enough though .. want wait to read the first driving report.