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From: "Douglas Brunner" <douglasbrunner@earthlink.net>
Subject: FW: Adding an AOA
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I am thinking of adding an AOA to my plane.  The two models that I am
looking at are the Bendix King KLR 10
(http://www.bendixking.com/Products/Flight-Controls-Indicators/Indicators/KL
R-10) and one of the Alpha Systems units (http://www.alphasystemsaoa.com/) 

My question has to do with the calibration.  Both systems require a
calibration at 3 points:

1.      On Ground

2.      Optimum Alpha Angle

3.      Cruise

 

The "on ground" and "cruise" are self explanatory, however the definition of
"Optimum Alpha Angle" seems a little "loosey-goosey" to me.  Here are the
definitions:

 

Alpha Systems "Optimum Alpha Angle"

.         Able to hold altitude - as close to 0 VSI as possible, zero sink

.         Full aileron, elevator and rudder control - no buffet or loss of
control surface stability

 

Bendix King "Optimum Alpha Angle"

.         Able to hold altitude, 0 Vertical Speed, zero sink (5 to 10 fpm
climb OK)

.         Full aileron, elevator and rudder control, not in a buffet, pilot
to identify the set point by

pitching back slowly to a pitch no longer able to climb but able to hold
altitude with full

control of the airplane.

 

First of all, since this is a system meant to be used in landing (or at
least that is how I will mostly use it), I intend to calibrate the "Optimum
Alpha Angle" in landing configuration (gear down, full flaps).  However,
determining when I have "full aileron, elevator and rudder control" isn't
all that clear to me.  I am sure that I can tell when I have aileron,
elevator and rudder control - but the "full" part is less clear.  Does that
mean a full control deflection?  Not something I am anxious to try that
close to stall.

 

Alternatively, I could just do a stall in landing configuration and set the
"Optimum Alpha Angle" to 1.3 x stall.

 

Advice?

 

D. Brunner

N241DB 750 hours


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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;line-height:115%'>I am =
thinking of adding an AOA to my plane.&nbsp; The two models that I am =
looking at are the Bendix King KLR 10 (<a =
href=3D"http://www.bendixking.com/Products/Flight-Controls-Indicators/Ind=
icators/KLR-10">http://www.bendixking.com/Products/Flight-Controls-Indica=
tors/Indicators/KLR-10</a>) and one of the Alpha Systems units (<a =
href=3D"http://www.alphasystemsaoa.com/">http://www.alphasystemsaoa.com/<=
/a>) <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;line-height:115%'>My question has to do with =
the calibration.&nbsp; Both systems require a calibration at 3 =
points:<o:p></o:p></span></p><p class=3DMsoNoSpacing =
style=3D'margin-left:.5in;text-indent:-.25in;mso-list:l1 level1 =
lfo2'><![if !supportLists]><span style=3D'font-size:12.0pt'><span =
style=3D'mso-list:Ignore'>1.<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span style=3D'font-size:12.0pt'>On =
Ground<o:p></o:p></span></p><p class=3DMsoNoSpacing =
style=3D'margin-left:.5in;text-indent:-.25in;mso-list:l1 level1 =
lfo2'><![if !supportLists]><span style=3D'font-size:12.0pt'><span =
style=3D'mso-list:Ignore'>2.<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span style=3D'font-size:12.0pt'>Optimum =
Alpha Angle<o:p></o:p></span></p><p class=3DMsoNoSpacing =
style=3D'margin-left:.5in;text-indent:-.25in;mso-list:l1 level1 =
lfo2'><![if !supportLists]><span style=3D'font-size:12.0pt'><span =
style=3D'mso-list:Ignore'>3.<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span =
style=3D'font-size:12.0pt'>Cruise<o:p></o:p></span></p><p =
class=3DMsoNoSpacing><span =
style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNoSpacing><span style=3D'font-size:12.0pt'>The &#8220;on =
ground&#8221; and &#8220;cruise&#8221; are self explanatory, however the =
definition of &#8220;Optimum Alpha Angle&#8221; seems a little =
&#8220;loosey-goosey&#8221; to me.&nbsp; Here are the =
definitions:<o:p></o:p></span></p><p class=3DMsoNoSpacing =
style=3D'margin-left:.5in'><span =
style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNoSpacing><span style=3D'font-size:12.0pt'>Alpha Systems =
&#8220;Optimum Alpha Angle&#8221;<o:p></o:p></span></p><p =
class=3DMsoNoSpacing =
style=3D'margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 =
lfo4'><![if !supportLists]><span =
style=3D'font-size:12.0pt;font-family:Symbol'><span =
style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span style=3D'font-size:12.0pt'>Able to =
hold altitude &#8211; as close to 0 VSI as possible, zero =
sink<o:p></o:p></span></p><p class=3DMsoNoSpacing =
style=3D'margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 =
lfo4'><![if !supportLists]><span =
style=3D'font-size:12.0pt;font-family:Symbol'><span =
style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span style=3D'font-size:12.0pt'>Full =
aileron, elevator and rudder control &#8211; no buffet or loss of =
control surface stability<o:p></o:p></span></p><p =
class=3DMsoNoSpacing><span =
style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNoSpacing><span style=3D'font-size:12.0pt'>Bendix King =
&#8220;Optimum Alpha Angle&#8221;<o:p></o:p></span></p><p =
class=3DMsoListParagraph =
style=3D'margin-bottom:0in;margin-bottom:.0001pt;text-indent:-.25in;line-=
height:normal;mso-list:l2 level1 lfo6;text-autospace:none'><![if =
!supportLists]><span style=3D'font-size:12.0pt;font-family:Symbol'><span =
style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span style=3D'font-size:12.0pt'>Able to =
hold altitude, 0 Vertical Speed, zero sink (5 to 10 fpm climb =
OK)<o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'margin-bottom:0in;margin-bottom:.0001pt;text-indent:-.25in;line-=
height:normal;mso-list:l2 level1 lfo6;text-autospace:none'><![if =
!supportLists]><span style=3D'font-size:12.0pt;font-family:Symbol'><span =
style=3D'mso-list:Ignore'>&middot;<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span style=3D'font-size:12.0pt'>Full =
aileron, elevator and rudder control, not in a buffet, pilot to identify =
the set point by<o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'margin-bottom:0in;margin-bottom:.0001pt;line-height:normal;text-=
autospace:none'><span style=3D'font-size:12.0pt'>pitching back slowly to =
a pitch no longer able to climb but able to hold altitude with =
full<o:p></o:p></span></p><p class=3DMsoNoSpacing =
style=3D'margin-left:.5in'><span style=3D'font-size:12.0pt'>control of =
the airplane.<o:p></o:p></span></p><p class=3DMsoNoSpacing><span =
style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNoSpacing><span style=3D'font-size:12.0pt'>First of all, =
since this is a system meant to be used in landing (or at least that is =
how I will mostly use it), I intend to calibrate the &#8220;Optimum =
Alpha Angle&#8221; in landing configuration (gear down, full =
flaps).&nbsp; However, determining when I have &#8220;full aileron, =
elevator and rudder control&#8221; isn&#8217;t all that clear to =
me.&nbsp; I am sure that I can tell when I have aileron, elevator and =
rudder control &#8211; but the &#8220;full&#8221; part is less =
clear.&nbsp; Does that mean a full control deflection?&nbsp; Not =
something I am anxious to try that close to =
stall.<o:p></o:p></span></p><p class=3DMsoNoSpacing><span =
style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNoSpacing><span style=3D'font-size:12.0pt'>Alternatively, I =
could just do a stall in landing configuration and set the =
&#8220;Optimum Alpha Angle&#8221; to 1.3 x =
stall.<o:p></o:p></span></p><p class=3DMsoNoSpacing><span =
style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNoSpacing><span =
style=3D'font-size:12.0pt'>Advice?<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:12.0pt;line-height:115%'><o:p>&nbsp;</o:p></span></p><=
p class=3DMsoNormal><span style=3D'font-size:12.0pt;line-height:115%'>D. =
Brunner<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;line-height:115%'>N241DB 750 =
hours<o:p></o:p></span></p></div></body></html>
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