byoungplumbing(at)gmail.c
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 Posted: Sun Feb 05, 2012 9:22 am Post subject: kolb stall |
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vic & the group
I think when you get down to fine tuning an aircraft,,, (with regard to
stall) there are multiple factors, clean air, vs ground effect. the
numbers will be different, and if you want to see the most difference check
the difference in a very low wing design. when you get down to it, the
best way to determine stall, is to use an angle of attack meter, but
because of the cost involved, most light planes do not have one. as long
as the stall is done at 1 g or very very close to it. the airspeed at stall
is quite consistent, that is what is usually used. but when doing some
accelerated maneuvers, the angle of attack to produce a stall can be
reached well above the 1 g stall speed. (accelerated stall). the one
thing that can reach up and grab some pilots by surprise, it the stall at
landing, where you would think it is a 1 g landing flair... but when the
sink rate starts to increase, due to pilotage, wind gust, pause in wind or
other factors in the landing environment, and the pilot has to pull the
stick/yoke, to stop the sink rate, the g force can temporarily go above 1
g, the angle of attack be increased, and an accelerated stall reach up and
say "got ya". in planes like kolbs, there can be slight differences in the
peto/static system at different angle of attack and g levels. so unless
you can account for all the variables... or spend the money for angle of
attack instruments.. the ASI will only get you so close. and if you can
repeat the landings to the exact set of variables the ASI is as good as you
can get for the money. if you need more precision, spend the money.
so unless I have been down a long slippery slope with regard to this issue,
in theory, training and practice. I believe both parties are correct,
but each needed to qualify their answers. I hope more than I have benefited
from this, than just me as a refresher. they say you never learn something
as well as when you have to explain or teach it.
boyd young
mkIII
utah
archive this one.
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