VNE Speed too strict?
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I've found ( the hard way ) that the TBM 850 overstressed at around 264 IAS. A bit short of the official maximum of 266 IAS and I feel that a margin of a few knots is missing , as manufactures take some safety margins. Also I don't recall I've experiencing any buffeting (and noises) effect when getting close to VNE. There is such effect with the default TBM 930 which improves the feeling of over-speed and could be a nice effect to add when getting very close to the structural limit. Hope this could be look into for a future update.
Thanks
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oh and another excerpt from an article I've previously posted about (https://www.flyingmag.com/pilot-reports-turboprops-tbm-850-even-faster/ )
This one discussed the qualities of the TBM airframe strength:Mach effects change with air density, becoming more critical as atmospheric density decreases with altitude. For that reason, nearly all turbprop airplanes adjust Vmo down as altitude increases, thus delivering a larger margin away from the detrimental effects of Mach as the airplane climbs. The creators of the TBM took a different tack and designed in enough airframe strength and flying qualities margin that the airplane exceeds all standards at 270 knots indicated airspeed at any altitude up to its 31,000-foot ceiling. The single red line Vmo of the TBM reflects both exceptional airframe strength, and very predictable and benign flying qualities at all altitudes. While some turboprops are limited by their Vmo at high altitude, the TBM never is. That is especially important on descent, where you can shove the nose over in the TBM on descent and gain back some of the time spent in climb by coming down at a very high true airspeed without a reduce red-line limitation.