The Navy actually referenced that study quite a bit when I was flying as a SAR crew chief. International orange alternating with a darker color seemed to work best for spotting aircraft as they maneuvered. if the aircraft was constant heading/attitude at your same altitude, nothing much worked but very bright flashing lights.There was a study on aircraft visibility done in New Zealand years ago with small military piston trainers. IIRC, they tried white, black, yellow, and orange and each one had advantages in different conditions: looking up against a blue or overcast sky, looking down against an earth or forest or water background, etc. I think in the end they chose yellow but painted the movable control surfaces black to make it more interesting. Something like that, or maybe white with bright orange control surfaces and cowling, certainly couldn’t hurt.
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