what do you mean 28 volts? Was it a steady 28 volt output like my alternator is a steady 12.5 volt output?
Thanks.
Yes your right...hmm... Well i guess the 28 volt output dosent mean much when the voltage regulator is removed on the output side...
But why he choose this heavy duty aircraft type must be that he could have a much higher voltage on the input of rotor and then again much higer voltage on the output than with a 12 Volt alternator.
If you look at patent number 4613779 : "Electrical pulse generator" where written" A very uneffective device is the auto alternator .. so used an aircraft alternator insted...

Best regards
I belived some time that the alternator he used was from a early Ford Bronco or a Thunderbird, but when i zoomed in the black and white photo where the alternator and drive motor is on the ground and the fuel cell is beside the car, i could see two screws close to the bearing center of the alternator and the terminals had a different design.
The aircraft alternator i have found is the only one that match the one Stanley used.