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dtmdragon

F-101 'pitch up' stall/ spin at high AOA

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I am trying to learn some more about how the FM works etc. Can some one tell me what data.ini entries/ figures in the F-101 data.ini create the sudden stall and spin when you suddenly put the aircraft into a high angle of attack (pull up suddenly)? As compared to the stock data.ini of say the F-8?

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Funny you should ask that. I was just recently messing around with my own long term F-101 FM which uses a pitch up effect. If you have the original FM you probably want to check the StallMoment=whatever entry for the inner and outer wing panels. They are typically in  the 0.000 to -0.002 range. To generate a pitch up, you can bump the numbers up to something considerably higher. I was using StallMoment=0.08 on the inner [forward] wing panel and StallMoment=0.000 on the outer wing panel which gave an interesting pitch up effect.

I was on the verge of doing an informal release of my RF-101 FM but decided to re-think the whole pitch up issue. The effect is just a simplified work around and doesn't really reflect the actual aerodynamics of the VooDoo pitch up, plus the Voodoo had roll and pitch limiting systems as well as a stick pusher to avoid pitch up so it might actually make more sense to try and simulate a stick pusher effect, with a large nose down [negative] StallMoment. Unfortunately, from past experience with the F-104, I've never been able to get a convincing stick pusher effect.

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I have these F-101 manuals and documents if you want them.

F-101A Phase II Flight Evaluation (September, 1955)
T.O. 1F-101(R)A-1 (15 December, 1958)
T.O. 1F-101B-1 (15 July, 1963) 
T.O. 1-1c-1-11 (1 August, 1966, Changed 25 July, 1969) F/RF-101 Flight Crew Air Refuling Proceduers with KC-97L, KC-135 Supplement XI 
T.O. 1F-101(R)G-1 (1 March, 1971; Change 1, 15 June, 1971)

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