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Date: Sat, 25 Aug 2001 18:42:12 -0700 (PDT)
From: filidauro lemaire <filidauro@yahoo.com>
Subject: L/D Max
To: lancair.list@olsusa.com
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[Best L/D identifies 3 serious flight regimes, those
being best angle of climb, the engine out maximum
glide, and the maximum endurance angle]

Marv, you probably meant 'range' instead of
'endurance'.
Regards, fili


[Hi Fili,

Actually I'd have to think about this a bit... the reason that the best
L/D is considered the max endurance angle of attack is because if you
set that agle of attack and then set the power to simply hold altitude,
you'll be flying at a significantly reduced airspeed than that which
you'd normally cruise at.  This would give you the lowest fuel burn at
which you could maintain altitude, and keep you in the air the longest.
This is the AOA that you'd want to fly if center was putting you into
an extended holding pattern, as it is the easiest on your fuel supply.
Due to the significantly lower airspeed required to maintain this
particular AOA it's likely that it wouldn't take you the furthest, especially
in our slippery Lancair airplanes.  Determining maximum range would
require graphing fuel burn against airspeed, and somewhere along that curve
you'd find the best speed to fly to go the farthest based on available fuel.

  <Marv>     ]


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