Re: Friction Drive In The Rain
Back when I was new to motored bikes I rebuilt a couple of old bikebug friction drive engines. Neither had much rubber left on the drive rollers so re-using the aluminum drive roller core I cast my own drive rollers in epoxy. Of course I experienced the same slipping in wet conditions as described in this thread. That led me to experiments in casting drive rollers with very fine sand mixed into the epoxy. I used sand from the nearby lake and filtered it with window screen to get the smallest grit, understanding that a roller with a lot of grit would eat tires quickly. Wet weather conditions required changing the roller, but made wet weather riding an okay proposition.
Someday when I grow up I will probably lose interest in toys with wheels, but until then...