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<< Lancair Builders' Mail List >>
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Sorry, that's 63 KIAS, not mph. Just checked the factory spec sheet
again, and it gives 57 mph as the stall - Wow! <
Whenever I see discussions of stalling speed, sorry I just cannot resist to
comment. Having spent the past four years developing an affordable AOA and doing
lots of test flying let me comment that probably your 63 KIAS is no more
that a few knots TAS different than some one elses 57 mph stalling speed. You have to remember that IAS is just that "indicated".
Stalling speeds vary between identical aircraft by weight, CG, bank angle
and wing loading. But in addition to that I have found large variances in
airspeed indicators on the test bench at low speeds. There are hysteresis
errors and then there are errors built into the pitot/static system itself.
Differences from one pilot to another as to what a stall is also
contributes to the confusion: approach to stall, first onset of buffet,
nose breaks and etc. If the stalling speed is determined while carrying
some power you can always get a slower IAS stall than when not carrying any
power. This technique is how some manufactures cheat the true stalling
speed to get the very low low stalling speed numbers published. Don't be concerned about the IAS stalling speed! Chances are your aircraft
if flown in formation next to the factory aircraft with identical weights
and CG, they both will stall within a knot or two of each other assuming
both are stock aircraft.
The best way to gage a stall is with an angel-of-attack indicator. The
sooner we divorce ourselves from those old habits fostered by the
Government ( the IAS and stalling connection), the safer we will all be.
Jim Frantz
www.angle-of-attack.com
LML website: http://www.olsusa.com/Users/Mkaye/maillist.html
Builders' Bookstore: http://www.buildersbooks.com/lancair
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