policar type gearbox

[bowley]

Hi all I am building a 1/32 scale ford rs200. Was wondering if fiting a 3D printed policar gearbox & using a high reving motor would be good. Any help apreciated & I can see how it works but can anybody explain what this drive set up can improve or change. Many thanks regards bowley

[munter]

The only advantage the Policar gearbox might give you is a low centre of gravity but then that could also be acheived with an offsett pod or U bracket....suck it and see.

[bowley]

Ok thanks. So do you know how it difers from a pinion driving a crown gear on back axle? It must make some diference or why bother to make it

[bowley]

Ok thanks. So do you know how it difers from a pinion driving a crown gear on back axle? It must make some diference or why bother to make it

[Andrew Rowland]

I designed the Policar gearbox for slim backed F1 cars that need a very small rear crown gear.
It has other advantages when using the slimline motors that have very little braking effect due to low torque too.
It wouldn't offer advantage in a rally car.
Andi

[bowley]

Thankyou Andrew,it does look realy good so thats what got my interest. I dont know if you can help me,im building a rs200 with shaft drive 4x4 & as guide is too close to front axle have got a plan to get around it but ive heard that 4wd cars go best with front axle higher geared . Have you any advice on how much higher ratio would be best? If the rear is 9tooth pinion & 27tooth crown is front ratio better at 9:25 or or 9:26 for example. Is there a set rule to this or do I need to experiment with different gear ratios & find out which works best? Any help or advice most aplreciated,many thanks regards.