HeadSmess
Well-Known Member
- Local time
- 7:26 PM
- Joined
- May 17, 2010
- Messages
- 3,048
ive done the research.
its possible to drive the 3speed independent of the pedals.
first. shimano suntour has enough meat on the left hand side to machine a thread to take a "southpaw" sprocket. no way to jam any of its 4 freewheels without ending up with a single speed again though...
so...starting?
there are things called 1-way bearings. ie, freewheels... or sprag clutches? anyone into RC cars will know what they are. (just a bit bigger)
one of these, and a strong "clock" spring on the crank...
push it BACKWARDS, winding the spring... pull in clutch. engine will start
will have to mod the pinion retaining screw with stub to take the bearing....and think of a way to lock it.
all simple things with a lathe
its possible to drive the 3speed independent of the pedals.
first. shimano suntour has enough meat on the left hand side to machine a thread to take a "southpaw" sprocket. no way to jam any of its 4 freewheels without ending up with a single speed again though...
so...starting?
there are things called 1-way bearings. ie, freewheels... or sprag clutches? anyone into RC cars will know what they are. (just a bit bigger)
one of these, and a strong "clock" spring on the crank...
push it BACKWARDS, winding the spring... pull in clutch. engine will start
will have to mod the pinion retaining screw with stub to take the bearing....and think of a way to lock it.
all simple things with a lathe