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Date: Sun, 13 May 2012 18:51:25 -0400
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From: cwfmd@yahoo.com
Subject: Crossed Control Stall - REVIEWED- just use aerobatic plane!
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Disclaimer: I'm sure this(below) is well known to experienced Lancair pilot=
s.And this(stall REVIEW) is good advice to FAMILIARIZE yourself with this t=
ype of maneuverThis input/analysis is in support of the good flight trainin=
g advice provided,=A0 =A0 =A0 =A0 but here's the punch line:=A0Never try th=
is in a Lancair without a parachute, or at least not in the IV-P, with whic=
h I am only familiar. I theorize the (big engine) forward of cg weight dist=
ribution and what Burt refers to as "not enuf tail", may cause an irrecover=
able flat spin. I think this aero/mechanics theory could be simulated by a =
good undergrad Aero E. The scenario is that too much rotation mainly in yaw=
 (probably coupled from high roll rate at initial snap roll departure) in t=
he departure/ incipient spin, causes centrifugal force to pull the heavy IO=
-550 engine out from the axis of rotation. Then, either aero blocking of th=
e vertical stab/rudder(as in the A-4 inverted spin) or simply not enuf
 surface area, leads to a flat spin. Same factors prevent using horizontal =
stab and elevator to recover. Now only option is parachute- but I can't fig=
ure out how to get the (IV_P)door open even in normal flight much less this=
 odd force distribution.=A0Please practice this maneuver(extraLNC), especia=
lly in a small Cessna or Decathlon- {some 8KCABs have twisted the steel air=
frame in the longitudinal axis doing this- you can see it on the ramp, if y=
ou examine closely on preflight. and feel the trim error in flight .}=A0Exp=
loration of the NTSB data suggests it is usually SD: spatial disorientation=
(which can surprise, in VMC, with the right combination of unanticipated fo=
rces and panic) and these departure spin characteristics that have caused t=
he sad statistics. It's harder to modify the hardware, but we can add warni=
ng systems for both problems, but as is always the case, the least expensiv=
e and practical solution is to educate and train the operatorBe safe
 y'allBill Miller
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<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D"=
top" style=3D"font: inherit;">Disclaimer: I'm sure this(below) is well know=
n to experienced Lancair pilots.<div>And this(stall REVIEW) is good advice =
to FAMILIARIZE yourself with this type of maneuver</div><div>This input/ana=
lysis is in support of the good flight training advice provided,</div><div>=
&nbsp; &nbsp; &nbsp; &nbsp; but here's the punch line:</div><div>&nbsp;Neve=
r try this in a Lancair without a parachute, or at least not in the IV-P, w=
ith which I am only familiar. I theorize the (big engine) forward of cg wei=
ght distribution and what Burt refers to as "not enuf tail", may cause an i=
rrecoverable flat spin. I think this aero/mechanics theory could be simulat=
ed by a good undergrad Aero E. The scenario is that too much rotation mainl=
y in yaw (probably coupled from high roll rate at initial snap roll departu=
re) in the departure/ incipient spin, causes centrifugal force to pull the
 heavy IO-550 engine out from the axis of rotation. Then, either aero block=
ing of the vertical stab/rudder(as in the A-4 inverted spin) or simply not =
enuf surface area, leads to a flat spin. Same factors prevent using horizon=
tal stab and elevator to recover. Now only option is parachute- but I can't=
 figure out how to get the (IV_P)door open even in normal flight much less =
this odd force distribution.</div><div>&nbsp;Please practice this maneuver(=
extraLNC), especially in a small Cessna or Decathlon- {some 8KCABs have twi=
sted the steel airframe in the longitudinal axis doing this- you can see it=
 on the ramp, if you examine closely on preflight. and feel the trim error =
in flight .}</div><div>&nbsp;Exploration of the NTSB data suggests it is us=
ually SD: spatial disorientation(which can surprise, in VMC, with the right=
 combination of unanticipated forces and panic) and these departure spin ch=
aracteristics that have caused the sad statistics. It's harder to
 modify the hardware, but we can add warning systems for both problems, but=
 as is always the case, the least expensive and practical solution is to ed=
ucate and train the operator</div><div>Be safe y'all</div><div>Bill Miller<=
/div></td></tr></table>
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