[ARC5] R-25/ARC-5 Stabilized Receiver

[Gordon White]

   You may be right about the  OA-4 although I have seen a number, years 
ago.  I think I had half a dozen I gave to NASM in about 1983. I have 
seen AN/ARC-5 installations in P-51-D mockups,  including some non-VHF 
units, but I have no personal knowledge of the actual combat complement. 
Unfortunately, Jerry is no longer with us.

    As to altitude limits, if you read the detailed books on the Rolls 
Royce Merlin, such as  "Allied Aircraft Piston Engines of WW II" you can 
see how much better supercharged they were than the Allison, an engine 
designed by a committee. The Allison, however, made a great Gold Cup 
speedboat engine, at zero altitude. I have seen them in dragsters and 
tractor pulls, too.
- Gordon White