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Use GPS for your flight planning/following and Angle-of-Attack for flight
performance operations.  Excluding some design limitations, it is amazing
that none of the  performance numbers are based on a single IAS.

A good case in point is the bottom of the green and white radials on the
IAS.  They tell you your stalling speed in a very specific set of
circumstances.  You must be in 1 "G" flight, at maximum gross weight, and
at a known CG.  Any maneuvering such as turns, pull-ups, slips, skids or CG
or GW changes makes the bottom of the green and white radial useless and
misleading.

Generally, the only valid use of IAS is for limitations such as maneuvering
speed, gear extend speed, maximum operating, flap extend, etc.  AOA is used
for approaches and landing, Vx, stall warning, best engine out glide,
maximum endurance, wing contaminant detection, and other performance
related parameters.

Use AOA for performance, use IAS for limitations, and use GPS for planning
and following.  Serious cross country aircraft should be set up with all
three.

Jim Frantz
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LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
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Please send your photos and drawings to marvkaye@olsusa.com.
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