Just informed via email that someone showed the photos of the Turboprop Biplane to some Relevant People and one recognized it as being a Grumman concept. No further data.
In retrospect, the forward fuselage does bear a great deal of resemblance to the Grumman XF10F Jaguar. This would make sense… the XF10F was first envisioned in 1948, the same general time period as the Turboprop Biplane. The XF10F was a design for the Navy, which the T.B. seems to have been. The XF10F featured variable sweep wings, which, while not being biplane wings, did permit for short span while stored on board a crowded aircraft carrier… just as the biplane configuration seems to have. The XF10F was *not* a turboprop, however… so this design may have also been meant for pure jet power as well.
More than two years ago I posted photos of a large display model of yet another XF10F variant HERE. Ah, good times. Here, let me cut-and-paste some of that earlier post…
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One Response to “Turboprop Biplane Update”
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Grumman doesn’t make sense to me, the vertical fin shape is wrong, and if it’s turbojet powered, it’s going to be way underpowered from the small size of the intake and have a huge radome on it.
To me it looks like it’s powered by the same type of contraprop and twin exhaust turboprop engine setup used on the Skyshark, with the engine exhaust being located under the aft edge of the wing.