I am a volunteer at the Oakland Aviation Museum.  We have a WWII Sperry S-1 bombsight that I am trying to restore as part of a simulator for public education.  It requires 3 phase 400hz 110V power.  Any suggestions as to where such a power supply can be obtained?

Hi,

I have a Generator manufactured by Plessey Aerospace.  2 CYL Lister diesel 4.5KW 3 Phase 400 Hz :-)

Single-Phase Transformer Transfer AC voltage of 100V, 110V, 120V, 200V, 220V, 230V, 240V to lower AC voltage. The input could be provided with single, double or triple voltage winding. Output can....
Guangzhou Yongxiang Electrical Appliance Factory (China)

Try using  a WW2 Dynamotor they convert 12 Vdc or 24 Vdc to a 400 cycle output, there may even be a 3 phase type. 

Check on Ebay. You can probably find one 28VDC input and a decent price. Bob avionicsnet.com