Friction drive motor wheel design

[xxxxAndyxxxx]

I have installed a friction drive on my pub bike (an old road bike) which currently has a skateboard wheel fixed to a motor permanently driving the rear wheel. This has two drawbacks. 1 it slips on a wet road and 2 It adds drag when the motor isn’t powered.

I have been given a large tin of araldite (this stuff sets rock hard) and I have had the idea of 3d printing a mould and encasing a bmx sprocket in it to give me a small freewheel.

Seeing as I can print any mould pattern and shape I like I was pondering what would be the best design for the greatest grip in the wet.

Any thoughts?

 

[amberwolf]

There are quite a few friction drive threads in this section
https://endless-sphere.com/forums/viewforum.php?f=28
and elsewhere that discuss roller shapes, sizes, materials, etc., as well as ways to increase grip in the wet (higher roller pressure into tire, rather than just rolling on the surface, etc), and ways to freewheel if necessary (some drives only engage when in use, like Kepler's), so they're not dragging on the tire when not operating).

This is a (long) list of threads with Friction in the title
https://endless-sphere.com/forums/search.php?keywords=Friction&terms=all&author=&sc=1&sf=titleonly&sr=topics&sk=t&sd=d&st=0&ch=300&t=0&submit=Search
and this one is with Roller
https://endless-sphere.com/forums/search.php?keywords=Roller&terms=all&author=&sc=1&sf=titleonly&sr=topics&sk=t&sd=d&st=0&ch=300&t=0&submit=Search
not all threads there are relevant, but most of them should be, and could have the info you are after. You can narrow the search down with other terms, too, though that can sometimes be tough without knowing exactly what words someone else might have used.

There are probably useful threads that weren't titled with either of those words, too, but I can't think off the top of my head what to use to find them.