Does anyone know the turbo supercharger model used or proposed in the following aircraft?
Douglas A-20 (the first model - no suffix letter) - one A-20 was powered by a turbocharged R-2600. I would imagine it would have been a C-series turbo, considering the size and power of the engine, subsequent versions (A-20A onwards) doing without
Martin YB-10A - as an early turbocharged model it would have been GE Form-10 turbos (forerunner of the B-series), like on the XFM-1
North American XB-28/A - the XB-28 used an R-2800/GE C series turbo combination. The XB-28A used the same engine as the XA-26A/B/C so was without turbo
Lockheed XC-35 - I would guess it would be a Form-10 turbo, going by the size and power of the engine
Grumman XF6F-2 (R-2600 version) - not built? The second XF6F-2 had an R-2800 and a Turbo Engineering "Birman" turbocharger. Not successful
Boeing XP-4 - possibly the same as the Y1P-25. A very early turbo, most likely a GE unit
Curtiss X/P-5 - possibly the same as the Y1P-25. A very early turbo, most likely a GE unit
Boeing XP-12G - possibly the same as the Y1P-25. A very early turbo, most likely a GE unit
Grumman XP-50 - GE B-series
Grumman XP-65 - none. It was to be the army version of the F7F which had 2 stage R-2800s, but no turbo
Bell XP-77 - None - see Japperwocky's reply
Thank you in advance.
Roger