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#21
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In article ,
john smith wrote: BTW, if flutter happens what do you glider pilots do: Nose up? Nose down? Start speaking German? They say the same thing we do, only in German it's one word instead of two and two syllables instead of one. The Norwegian term is "Uff Dah!" |
#22
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"BTIZ" wrote in message news:yN_Ue.14282$ct5.10523@fed1read04... snip Vne is based on IAS, TAS for the same IAS is higher at higher altitudes. But remember, it's not just airspeed, or airspeed indicator errors associated with altitude changes, but also other dynamic "q" factors on the airframe at higher "effective" airspeeds. Thank you for the informative reply. Please define "q" |
#23
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snip
On Sun, 11 Sep 2005 04:46:58 GMT, "private" wrote: snip Can I have the groups wisdom and further explanation of the reasons for this and of how Vne changes with altitude. Thank you all for the informative discussion. Happy landings |
#24
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"T o d d P a t t i s t" wrote in message ... snip ... Just checked Google ... at 100,000' they expect the sea level stall speed of 88 km/hr to increase to 740 km/hr TAS and Mach .66! Got me thinking about Joe Kittinger and what the sound barrier must feel like in freefall. Happy landings |
#25
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"T o d d P a t t i s t" wrote in message news "private" wrote: with altitude changes, but also other dynamic "q" factors on the airframe at higher "effective" airspeeds. Thank you for the informative reply. Please define "q" Q is the term aerodynamicists use to refer to "dynamic pressure." Dynamic pressure is equal to 1/2 x rho x V**2. It's the pressure your airspeed reads - the difference between pitot pressure and static pressure. It's a pressure solely due to airspeed. If you listen to a space shuttle launch you will hear a reference to "max-q." That's the point of max aerodynamic stress on the shuttle. As the shuttle accelerates, airspeed increases, which increases q, but as it climbs, rho (air density) decreases, which decreases q. After max-q the decreasing air density decreases q faster than the increasing speed increases it. thanx, I should have remembered that, but then I would not have learned about "max q" Happy landings |
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