"A toy aeroplane is something you wind up, put down and it rolls around on the floor!"
In an old Air Progress magazine there is a story on the production of the movie. The "plane" was actually built from the parts of a C-82 Packet. When they test ran the engine, the vibration was tremendous, so the installed a smaller engine, one from a T-6 I think. I don't know how many flights they attempted with the machine. In the final sequence where they over fly the oasis, look closely and you'll see it's not the title airplane, but looks to me to be a Skyraider with a butchered up canopy and stuff hung on the wings to resemble the title airplane. Great movie. The catalog they flip through looks like it may have been a Graupner item. Paul Mantz's death is acknowledged at the end of the movie, "It should be noted that Paul Mantz, a fine gentleman and great aviator, gave his life in the making of this picture." Or something to that effect.
Type at you later,
Dan McEntee