Tranmission idea:

[Sidewinder Jerry]

What you have there is essentially the basis for a single freewheel shift kit.

If there's a second freewheel on the engine secondary sprocket this is the same principle a Staton Inc double freewheel shift kit works on. Unlike a single freewheel shift kit the engine drive chain doesn't move when only the pedals are being used.

 

[oojoe]

I have been looking at the ((search 4) Sturmey Archer Internal 5-Speed Coaster Brake Trike Add-On Kit )-- and wonder if there is any way to add another sprocket to what is there for my etrike.

 

[Sidewinder Jerry]

You mean like this?