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Re: 1/3 Black/ Farbton70 and White Spinner on 109s
Thought that spiral was ground crew warning had been discounted long ago based on Ultra reports noting it as a mid-late war recognition for fighter aircraft. The DB601 had a drive reduction ratio of 14.9:1, so at the engine's max RPM of 2400, the propeller was spinning at a touch more than 160 RPM. Which gives lots of time for the spiral to be seen.
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Steven "Modeldad" Eisenman
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