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#1
December 18th 04, 03:35 AM
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"David CL Francis" wrote in message However if you fly for maximum range
than you fly close to maximum lift/drag ratio which depends only on getting the correct alpha (ignoring compressibility effects). If the correlation between thrust and fuel burn is fairly linear, this is correct. A piston powered airplane with a constant speed propeller will achieve max range at any altitude it can sustain the correct alpha angle. Jets do not have a linear correlation. The jet I fly gets the same fuel burn at 5000' and 250 KIAS as it does at FL350 and 440KTAS. So since lift = weight, drag depends on weight and it reduces as fuel is burned. Remember that there are 2 kinds of drag- Parasite and Induced. Parasite drag is dependent on speed. Induced drag is dependent on alpha angle (among other things). I suggest a book called 'Aerodynamics for Naval Aviators'. Most good pilot shops have it. D. 
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#2
December 21st 04, 12:12 AM
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On Sat, 18 Dec 2004 at 03:35:40 in message
, Capt.Doug wrote: Remember that there are 2 kinds of drag- Parasite and Induced. Parasite drag is dependent on speed. Induced drag is dependent on alpha angle (among other things). Yes but induced drag depends on Lift coefficient (the square of it approximately) so if you fly at maximum Lift Drag the alpha and the contribution of induced drag remain the same. I have certainly not forgotten induced drag. -- David CL Francis
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