Modelling > Engineering Dept.
RW materials question for the Whiffverse:
GTX_Admin:
--- Quote from: tankmodeler on January 06, 2014, 10:53:22 AM ---Mach 2.7 in a Phantom might be the "do not exceed" speed, but it's not somethiing that could be maintained for more than a second or two, much less minutes. And probably not obtained in level flight. You probably needed to be in a serious dive, with a tailwind, to get near it. :)
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That's where the suggested rocket helps...
tankmodeler:
--- Quote from: GTX_Admin on January 06, 2014, 02:38:46 PM ---That's where the suggested rocket helps...
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Generally, when you exceed the "do not exceed" speed, the wings fall off immediately, they don't take the time to melt. :) DNE speeds are almost always structural limits.
Paul
elmayerle:
Not necessarily wings, the DNE speed for the XF8U-3 was, so I've read, set by where the canopy started melting. So DNE values are set by reality, the Mach .82 DNE for the Learjet is set by where the wing is almost at a Mach tuck condition where the flow over the wing goes supersonic and generates a severe nose-down pitching moment. There were some cases in the early 1980's where Learjets made big smoking holes from 45,000 ft. and it was found that the pilots had prevailed on the maintainers to put in an over-ride on the Mach limit function on the autopilot to allow them to go faster; unfortunately, this got them into this range.
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