vid showing "finished" belt-start conversion for my "red-neck" electric starter

I've been working on a shaft-drive system for a Cox .049 Babe Bee engine which will require starting the engine via a "belt" (O-ring). There are flywheels that were purpose-designed by Cox, Dumas and Sterling for running an engine in a marine application. They all have a "groove" (like a pulley) for a belt to grip... or string to be wound-around. I decided to make my own flywheels using some small discs that I'd cut on a CNC mill.. years ago. The discs all have .125" dia. (1/8") center-holes to fit the Cox .049/.051 prop-screw which is a 5-40 size machine-screw.

Once I had the flywheel(s) configured, I devised a system to mount one to the engine.. along with a coupler for an output-shaft. The coupler receives 1/8" (3.17mm) shafts on both sides; secured via set-screws.

The engine side was made using a 1" long 5-40 cap-screw with its head cut-off. I then filed a "flat there" for the coupling's set-screw to bear-on. A 5-40 hex-nut locks the assembly against the engine's prop-drive plate.





A repeat-assembly was made for the 1/8" dia. shaft on my electric starter's 540 series can-motor.



Here's the orig. thread for the starter alone back in 2013.

Below is a link to a short YouTube vid of a test I made this afternoon. I'm happy with the outcome.. and feel more positive about proceeding with a current project for an engine configured this way.