I have been reading this thread with interest. Amongst several projects I have on the go at the moment is one of the 1/4 scale hopper cooled horizontal open crank Red Wing engines.
I year or two ago I rescued a dynamo from the front wheel hub of an old bike thrown in the big skip at work, with the intention of driving it with the Red Wing engine, when I finally finish it.
This dynamo is also a Sturmey Archer and although in good external condition it is in need of a strip and rebuild. I think it dates from the late 1950's or early 60's, it's stamped on it somewhere. A special keep plate is required when dismantling to prevent loss of magnetism.
When I was a teenager I had a speedometer on my bike and this, like your dynamo, was also driven off the front tyre. So while eagerly seeing how fast I was going it was actually slowing me down. I remember crashing into the front of a parked car while concentrating on the speedo as I frantically tried to break the 15 MPH barrier! Spectacularly bent front forks were the result.
I also remember fitting a small mileometer, this was mounted on the front wheel spindle and was driven off a small lug clamped to one of the spokes. I am sure I also crashed into another stationary solid object while squinting to make out the vast distance I was sure I had travelled, bloody hell!
Anyway, this thread has renewed my interest so I will take a closer look at that old dynamo. I suspect the hub type do not need to rotate as fast as the tyre driven type.
