[427TJ]

Yep, straight and level flight over a measured mile at low altitude. The airplane isn't allowed to climb above a certain altitude and must accelerate in level flight--the pilot can't dive the airplane to gain airspeed. Lyle Shelton set that record somewhere in northern New Mexico to take advantage of thinner air in the high country. I think it was 1989 or '90.

Here's another shot of Rare Bear at Reno in 1991. The propeller uses blades from a Lockheed P-3 Orion, an engine from a Douglas Skyraider (3,350 cubic inches, 18 cylinders), the engine cowling is from a Douglas DC-7 prop airliner, and a cut-down canopy, shortened wings, etc. No, it's definitely not stock!