BBY ZX5 Conversion

[Skidrow]

Hello there.This is my conversion for the ZX5. Motor,Batteries and electronics are centered and the chassis is formed to allow for the minimum possible ground contact area.Dropdown transmission in front of the motor is via gears opening up overdrive options.All comments and suggestions welcome.If you like it and want one pm me

[Skidrow]

Some more photos .Sorry for the random tyres

[Skidrow]

More photos

[Skidrow]

More photos with body on

[Northy]

Great work Manolis, you are the man

G

[Skidrow]

Thanks Graham!

[lochness42]

How it jumps? As I said you before, motor in this position will most likely cause strange air behaviour - applying throttle or brakes should not only affect front - rear rotation, but also left - right. That maybe also should appear on track not only in air.

[Skidrow]

Hello Pavel and thanks for stopping by.Some good 8th scale racers I know use throttle in the air to correct the left/right attitude in big jumps(you do not always fly straight) and like cars that are responsive in that way. Also gyroscopic phenomena that you might be discussing do also affect the axis that is vertical to the one of the main mass rotation(eg mass of front wheel of a bike=mass of spur gear and layshaft here) .In small jumps things are not really different in comparison to other narrow cars. To me the biggest difference I noticed with this one was when the material of the top shaft and it was not when jumping.

[lochness42]

Well, I'm racing conventional belt cars for all the time so can't be completely sure. For left/right I'm using steering front wheels and applying throttle. That's how you can do that with shaft car as well. I simply don't think that throttle should affect left/right change very much as you should do this with steering.

[jaank]

And costs?
The steering link is soft place.
One hit and something gonna be broken.

[rowanp25]

some footage of it running would be interesting. i ould be concerned about it twisting in the air and odd traction under accel. saying that you could possibly counter that with ading weight to the slipper making it a counter for the motor rotation (say brass slipper plates??) it could also help in rough conditions like the losi Hydra drive used to. also hows he wheelbas compared to the standar kyosho?

[Skidrow]

Pavel-No problem ,those considerations made the project worth exploring at first place.

Jaank-To be honest I tried to reverse the servo so that the horn sits towards the front of the car and the steering link is shorter.Though this exposes less of a chance for bending the steering link,the fact that it is shorter makes it more rigid and more likely to break a ball cup instead of it just elastically bending and coming back to shape at the event of a crash.As it is right now I can push it by hand until it touches the alloy front servo mount as in the event of a crash and then come back to shape after.I will try to make a photo of this later so you can see for yourself.Please also check your pms

Rowan-I will see what I can do with the video.The wheelbase is a bit longer than an FS.The brass slipper idea sounds interesting but it might be difficult to make the flats that transmit torque last.Might be easier to stick radial brass pieces to the existing slipper plates.I think it is worth trying.

[lochness42]

Originally Posted by rowanp25

some footage of it running would be interesting. i ould be concerned about it twisting in the air and odd traction under accel. saying that you could possibly counter that with ading weight to the slipper making it a counter for the motor rotation (say brass slipper plates??) it could also help in rough conditions like the losi Hydra drive used to. also hows he wheelbas compared to the standar kyosho?

I belive that brass slipper plates can make things even worse car will have tendency to rotate even more around axis between motor and slipper as slipper is right over motor. Idea with brass slipper plates are supposed to work if slipper is next to motor. I'm not engineer, but this is my assumption based on my common sense.

[rowanp25]

its defo a possibility if side by side the rotation can create a vertical force up or down which in turn aids traction but in this case it would possibly create a lateral force left or right but id assume would stop it twisting so the traction on all four wheels would remain even. as with all cars at this stage it looks to be a work in progress.
i look forward to any footage to see how it actually runs! only then can we see any actual flaws instead to theory