Originally Posted by kobra_428
Ok...... What make of Car engine was used as an APU ( Aux Power Unit ) on the B-29.
They used two types of engines for the APU.
One was the Lawerance Model 20 horizontally opposed piston, or boxer engine.
The other was the Andover V-Type gasoline powered air cooled engine.
They both were used to drive the AP-2 type 200 amp DC gen. used for starting the engines or AUX power.