I have one of those on my vintage(1958) 12hp 2cyl gasoline engine in my wooden boat... ;)
It's not the strongest of starters but works ok, and delivers a charge of max 11Amp. (There is an 20Amp available too i think...) I'm not sure of the power as a starter, but i think it draws around 50-60Amp.
The regulator is an mechanical variant, and is not suited in a humid enviroment like a wooden boat (hence the nickname Damnastart... :D ), but there are seldom any problems with it as long as the regulator are kept dry.
The problems starts after the boat has been at the bottom once, and the starter system didn't get a proper overhaul... :D (I speak of experience... :D )
As a dynamo, the dynastarter thrives at 3000-3500rpm, which is easily archieved on these old engines with big flywheels. The flywheel on my engine is approx. 15", and the wheel on the dynastarter is approx. 3.5" (4.25:1 ratio); running speed of the engine is around 750rpm.
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