HI THERE

i am = not familiar with the AOA you suggest=2C but the one we installed in my IVP= required zero gravity.

tie a string to a golf ball=3B hang it from the ceiling=3B WHEN it f= loats=2C press the buttons.

best done with two persons=3B one to fly=2C one to press butto= ns

peter

To: lml@lancaironline.netDate: Sun=2C 30 Mar 2014 10:23:22 -0400
From: douglasbrunner@earthlink= .net
Subject: [LML] FW: Adding an AOA

=3B

I am thinking of adding = an AOA to my plane. =3B The two models that I am looking at are the Ben= dix King KLR 10 (http://www.bendixking.c= om/Products/Flight-Controls-Indicators/Indicators/KLR-10) and one of th= e Alpha Systems units (http://www.alphasystemsaoa.com/)

My questi= on has to do with the calibration. =3B Both systems require a calibrati= on at 3 points:

1. =3B =3B = =3B =3B =3B On Ground

2. =3B =3B =3B= =3B =3B O= ptimum Alpha Angle

3. =3B =3B&n= bsp=3B =3B =3B Cruise

=3B

The =93on ground=94 and =93cruise=94 are self explanat= ory=2C however the definition of =93Optimum Alpha Angle=94 seems a little = =93loosey-goosey=94 to me. =3B Here are the definitions:

&nb= sp=3B

Alpha Systems =93Optimum Alpha Angle=94

=B7 =3B =3B =3B =3B =3B&n= bsp=3B =3B =3B Able to hold altitude =96 as close to 0 VSI as possible=2C zero sink

=B7 =3B =3B= =3B =3B =3B =3B =3B =3B Full aileron=2C elevator and rudder control = =96 no buffet or loss of control surface stability

=3B

Bendix King =93= Optimum Alpha Angle=94

=B7 =3B =3B&nbs= p=3B =3B =3B =3B =3B =3B Able to hold altitude=2C 0 Vertical Speed=2C zer= o sink (5 to 10 fpm climb OK)

=B7= =3B = =3B =3B =3B =3B =3B =3B =3B Full aileron=2C elevator and rudder contr= ol=2C not in a buffet=2C 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

cont= rol of the airplane.

=3B

First of all=2C since this is a system meant = to be used in landing (or at least that is how I will mostly use it)=2C I i= ntend to calibrate the =93Optimum Alpha Angle=94 in landing configuration (= gear down=2C full flaps). =3B However=2C determining when I have =93ful= l aileron=2C elevator and rudder control=94 isn=92t all that clear to me.&n= bsp=3B I am sure that I can tell when I have aileron=2C elevator and rudder= control =96 but the =93full=94 part is less clear. =3B Does that mean = a full control deflection? =3B Not something I am anxious to try that c= lose to stall.

=3B

Alternatively=2C I could just do a stall in landin= g configuration and set the =93Optimum Alpha Angle=94 to 1.3 x stall.

= =3B

Advice?

=3B

<= span style=3D"font-size:12.0pt=3Bline-height:115%=3B">D. Brunner

N241DB 750 hours