And then there are th issues of extremely long periods between application and grant. I can recall off the top of my head at least one aircraft design (Boeing "Quiet Bird") that spent about 30 years between application and publication; an early stealth aircraft from the 1960's that wasn't patented until after the F-117 and B-2 were flying around in broad daylight.
You seem to have forgotten the Boeing "Quiet Bird" stealthy attack aircraft from '62. Aircraft not built, but a half-scale RCS pole-model demonstrator using the same materials and shaping *was*. Turned out reasonably stealthy.
Matej said:Which can be 4 924 228
Matej said:Just WOW! I also want to know more!
XP67_Moonbat said:Awesome, thanks Scott. I had a feeling the tail was v shaped.
I'm drawing this old-skool style as my school is on break for two weeks and I don't have AutoCAD at home.
The designation ZO-4A (indicating a design in the planning stage) was reserved by the USAF on 28 May 1969. The O-4 was to be a quiet observation aircraft, similar in concept to the Lockheed YO-3A. It seems that one candidate (possibly the only one) for the O-4 requirement was the Wren 460QB, a modified Wren 460B (itself a highly modified derivative of the Cessna 182). In 1969, the USAF proposed the purchase of 28 of these aircraft. However, the O-4 program was terminated in the early 1970s because of budget restrictions.
AeroFranz said:Given the lack of weapons bay, it could well be a reconnaissance bird.