Wow now thats interesting Gene I was not aware that the Dynatrons had two different sets of switch points. I do love my Dynatrons though and I do beleve they are the most powerfull motor units commercially avalible intended for our use. I now have two the home converted geared and a single direct drive.

Recently added the direct drive and pretty much for a single airplane. That is a forty year old oldtimer giant called a Buckineer and around 120 inchs plus. The engine is also a rather vintage Kalt that is a cranky starter. What works best with that engine is cranking very fast but it also take a powerfull starter that the light weights just won't handle. There also is no spinner so the Dynatron being used direct drive with a standard small cone reversed and running on a short cord just like my geared Dynatron on a Black and Decker 24 volt drill battery.

That has been just the ticket for that airplane. Of course the down side of the Dynatrons is their weight and perhaps that makes them not so desirable for the smaller stuff and not very good candidates for a mounted battery and starter combo just because of the weight.

Just goes to show when it comes to starters there really is no 'one size fits all' I suppose

John