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Date: Tue, 28 Jun 2011 13:11:48 -0400
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From: Terrence O'Neill <troneill@charter.net>
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Subject: Re: [LML] Re: Airplane needs to be "fixed," Stall Speeds, Wing Cuffs, Vortex Generators for L...
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If I may, comparatively briefly:
We all know the word 'stall' refers the wing's airflow breaking away at =
a certain angle.
You,  the pilot, controls the angle at which the airflow approaches the =
wing.  Hands off the pitch control that angle stays where you trimmed =
it, regardless of attitude. You probably don't really believe that. but =
it's true -- unless -- you are too far aft CG, or the total airplane has =
a pitching moment that increases 'nose-up' as the AOA increases.

Many (military) aircraft with artificial stabilization are designed to =
use all lifting surfaces to get the best L/D, for more performance -- at =
the cost of stability.
GenAv planes don't. Some Experimentals are marginally stable or even =
unstable when at high AOAs.  Add to that, all the fatal GenAv accidents =
are caused by unintentional stalls, a quarter to a third of all fatals.
Because the pilot pulled his wing past its stall AOA .. unintentionally.
Unintentionally, because he can not SEE the air-to-wing angle.  Because =
he does not habitually reference how he is 'planing' his wing.  He uses =
airspeed, a very vague, inaccurate reference to the wing-wing angle.
For GenAv planes, the FAA persistently, ignorantly, does not require all =
airplanes to have an AOA indicating vane right in the pilot's field of =
vision, and require him to demonstrate using it, to get his license.

The great majority of pilots are not aerodynamics guys who have designed =
an airplane, built their own design, and then got in it and risked their =
life on their own design knowledge.   Most know about AOA, but don't =
understand it -- or use it.
I was ignorant too, in spite of my Navy wings and five more year of =
GenAv flying.  Until 1960 when I bought Waco's last prototype =
Experimental and restored and flew it, and then conducted a FAA Type =
Certification program for my own similar design, a 6-seater ... then I =
realized I needed to really understand what was going on at high AOAs, =
and started making my own AOA vanes, so I could see the angles, down to =
one degree, and watch them as I maneuvered the plane, stalled and =
unstalled the wing, watched the vane move as I moved the wheel in and =
out, like there was a string attached to the AOA vane.

It makes me so sad, every time I see a stall-related crash ... friends =
and compatriots, year after year, hundreds of great aircraft and =
wonderful people, die unnecessarily. =20
Why? =20
The GenAv survivors should blame the FAA and manufacturers' marketing =
departments. =20
We Experimenters have only ourselves to blame. We don't believe in AOAs. =
 We don't want to take the time or spend the money.  We don't want to =
make our beautiful planes ugly.  We don't want to degrade performance =
one mph.  We don't want to learn new tricks.  We're great pilots, and =
we'll never make that mistake. But a few of us do.
Please excuse my continued harping on this.  It's just 'tough love'.

Terrence
L235/320 N211AL


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<html><head></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">If I =
may, comparatively briefly:<div>We all know the word 'stall' refers the =
wing's airflow breaking away at a certain angle.</div><div>You, =
&nbsp;the pilot, controls the angle at which the airflow approaches the =
wing. &nbsp;Hands off the pitch control that angle stays where you =
trimmed it, regardless of attitude. You probably don't really believe =
that. but it's true -- unless -- you are too far aft CG, or the total =
airplane has a pitching moment that increases 'nose-up' as the AOA =
increases.</div><div><br></div><div>Many (military) aircraft with =
artificial stabilization are designed to use all lifting surfaces to get =
the best L/D, for more performance -- at the cost of =
stability.</div><div>GenAv planes don't. Some Experimentals are =
marginally stable or even unstable when at high AOAs. &nbsp;Add to that, =
all the fatal GenAv accidents are caused by <b>unintentional</b> stalls, =
a quarter to a third of all fatals.</div><div>Because the pilot pulled =
his wing past its stall AOA .. =
unintentionally.</div><div>Unintentionally, because he can not SEE the =
air-to-wing angle. &nbsp;Because he does not habitually reference how he =
is 'planing' his wing. &nbsp;He uses airspeed, a very vague, inaccurate =
reference to the wing-wing angle.</div><div>For GenAv planes, the FAA =
persistently, ignorantly, does not require all airplanes to have an AOA =
indicating vane right in the pilot's field of vision, and require him to =
demonstrate using it, to get his license.</div><div><br></div><div>The =
great majority of pilots are not aerodynamics guys who have designed an =
airplane, built their own design, and then got in it and risked their =
life on their own design knowledge. &nbsp; Most know about AOA, but =
don't understand it -- or use it.</div><div>I was ignorant too, in spite =
of my Navy wings and five more year of GenAv flying. &nbsp;Until 1960 =
when I bought Waco's last prototype Experimental and restored and flew =
it, and then conducted a FAA Type Certification program for my own =
similar design, a 6-seater ... then I realized I needed to really =
understand what was going on at high AOAs, and started making my own AOA =
vanes, so I could see the angles, down to one degree, and watch them as =
I maneuvered the plane, stalled and unstalled the wing, watched the vane =
move as I moved the wheel in and out, like there was a string attached =
to the AOA vane.</div><div><br></div><div>It makes me so sad, every time =
I see a stall-related crash ... friends and compatriots, year after =
year, hundreds of great aircraft and wonderful people, die =
unnecessarily. &nbsp;</div><div>Why? &nbsp;</div><div>The GenAv =
survivors should blame the FAA and manufacturers' marketing departments. =
&nbsp;</div><div>We Experimenters have only ourselves to blame. We don't =
believe in AOAs. &nbsp;We don't want to take the time or spend the =
money. &nbsp;We don't want to make our beautiful planes ugly. &nbsp;We =
don't want to degrade performance one mph. &nbsp;We don't want to learn =
new tricks. &nbsp;We're great pilots, and we'll never make that mistake. =
But a few of us do.</div><div>Please excuse my continued harping on =
this. &nbsp;It's just 'tough =
love'.</div><div><br></div><div>Terrence</div><div>L235/320 =
N211AL</div><div><br></div></body></html>=

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