Originally posted by cpxxx
I think we have established that the Typhoon is fast in a dive. Beaumont's 500 mph dive is confirmed by the pilot's notes 525 IAS which equates to 500 or so RAS. The correct TAS and Mach number is another matter. I would tend to believe Widewing when he says that .81 is high and probably a case of instrument error.
But essentially if you dive at 525mph indicated, as per the pilot's notes you shouldn't expect to buffet or tuck under. The notes after all are written for the perusal of ordinary squadron pilots not test pilots like Beaumont.
AH though, is not real life so it really has to be subject to inaccuracy or programming error. Even the atmosphere we fly in is simply a representation of reality. You simply don't have the variations in temperature or pressure or humidity you get in real life.
I don't think the Tiffie model needs much tinkering. It's as close as any in the planeset.
I suppose we could debate this back and forth. Indeed, this issue is not just related to the Typhoon. I was able to get an FM-2 up to 600 mph TAS in a dive, which is 117 mph faster than a real FM-2/F4F could attain due to drag. I can dive an A6M2 at speeds more 140 mph faster than where the ailerons shredded and the skin wrinkled, and it doesn't begin to buffet until 550 mph TAS. No zero ever saw 550 TAS with wings attached. Then there's the A6M5, which gets into an uncontrollable death spiral at just over 500 mph TAS. Why are they so different?
I'll argue to the cows come home that the Typhoon should see the onset of buffeting at Mach 0.70. It's NACA 2219 wing doesn't like speeds above that. Which is why the Tempest wing is completely different.
By the way, 525 mph TAS @ 5,000 feet is Mach 0.70.
525 mph IAS @ 5,000 feet, corrected for position error is closer to 498 mph IAS, or 547 mph TAS, which is Mach 0.73. The Tiffie ought to be shaking quite badly at that speed.
My regards,
Widewing