Kelly, this is nothing more than a SWAG, but one of the larger motor had these specs

 

Monster Power 160 (63M57)

 

It could handle 2700 watts.

 

At 16 Volts it would take 2700/16 =  168 amps input to generate 2700 watts.

 

So even if you assume it was only 50 % as effective as an alternator and after the voltage drop you would get across the diode array, it would appear

that 60 Amps at 13 volts would not be too wild a guess.  These motor wind at high rpms but then so doe our alternators.

 

My main concern would be whether these motor using for relative short duration flights - would provide the mechanical reliability at hours, days, weeks,  months, years of high continous rpm.  I don't think the electronics would be a problem, but not as comfortable about

 

1.  Mechanical reliability under the stress (hot engine compartments, hours of high rpm running)

2.  Cooling mechanism - I don't see any cooling fans like an auto alternator

 

But must admit 22 oz and 2.5 inches in diameter would sure make them attractive for aircraft use if my concerns are invalid

 

Ed

There are smaller truck motors that are water cooled. Most are around 80% efficient as motors. Brushed motors the same output are 50% efficient.

 

Years ago you used to see big DC wind generators mounted between the landing gear legs of Champs and Cubs.

 

How about the RAT installation. Or, a spring loaded motor with a friction tire that runs against the flywheel or water pump pulley, or the back side of any belt, with a last chance "T" handle to pull a pin to release the motor. Or a slack 1/4" wide "V" belt that tensions when the pin is pulled.

 

I saw a WWII Cushman scooter with an alnico magnet generator that just ran a headlight and charged a battery with no regulation. The scooter had welded rings on it so it could be air dropped. Cadillac used outrunners for several years for blower motors. The speed controller was in the main computer so it could not be discarded or repaired.

 

Lynn E. Hanover