UPDATE 3 Sept Sherm reached about 1000', radioed in 'loosing oil pressure'. Turned back towards the airport to land runway 12. Lowered the landing gear for landing. Loud 'Bang' was heard, aircraft pitched down steeply to impact.
Modified Skyraider prop did NOT have full feather capability.
Engine had numerous full power test runs on the ground before this 1st flight of the new engine.

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