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AOA can't target stall?

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mppalmer(at)aol.com
Guest

Posted: Wed Jun 13, 2012 11:04 am Post subject: AOA can't target stall?

Hi Bruce:



----------

Can't target stall? That's what an AOA does. A wing always stalls at the

same AOA. While the IAS will vary some according to weight, the AOA will

always be the same.

----------



Thanks for saying that for me! This product reminds me of a Huntington 

(sp?) "Lift Reserve" indicator from years ago that the inventor 

insisted wasn't an AOA but did the same thing - sorta.



I want to know the wing's angle of attack. Period. Heavy or light, 

pulling G's or level, the wing stalls at the same AOA no matter what 

the airspeed says. Elbie's Rite Angle might be old technology, but, if 

you could get it in clean air, it told you what your AOA was. At stall.



Mike Palmer

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Craymondw(at)aol.com
Guest

Posted: Wed Jun 13, 2012 12:22 pm Post subject: AOA can't target stall?

6 degrees??

  

  In a message dated 6/13/2012 3:04:39 P.M. Eastern Daylight Time,  mppalmer(at)aol.com writes:

  	  Quote: 	
		  -->    Glasair-List message posted by: mppalmer(at)aol.com



Hi    Bruce:



----------

Can't target stall? That's what an AOA does. A    wing always stalls at the

same AOA. While the IAS will vary some according    to weight, the AOA will

always be the same.

----------



Thanks for    saying that for me! This product reminds me of a Huntington 

(sp?) "Lift    Reserve" indicator from years ago that the inventor 

insisted wasn't an AOA    but did the same thing - sorta.



I want to know the wing's angle of    attack. Period. Heavy or light, 

pulling G's or level, the wing stalls at    the same AOA no matter what 

the airspeed says. Elbie's Rite Angle might be    old technology, but, if 

you could get it in clean air, it told you what    your AOA was. At stall.



Mike     the  ies  ay                 - MATRONICS WEB FORUMS               - List Contribution Web Site  p;                             



	


 [quote][b]

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Alpha Systems AOA

Joined: 11 Jun 2012
Posts: 3
Location: Ramsey, MN

Posted: Thu Jun 14, 2012 9:22 am Post subject: Re: AOA can't target stall?

I'm glad to have a conversation about angle of attack.  This is a topic that needs to have much more exposure.  Just to clarify, my last post did not state AOA could not target stall.  What I did say is that Alpha Systems AOA does not target stall but rather Optimum Alpha Angle.  Optimum Alpha is a slow flight attitude, in which the aircraft is not climbing nor sinking, roughly 1.25-1.3 Vso.  It is here that the aircraft still has full control surface authority and is still safely maneuverable.  At Alpha Angles above this, control surface authority begins to diminish and the plane moves closer to stall.  The way the system works is, it's calibrated through the Alpha ranges from zero differential pressure to Optimum Alpha(OAA) to Cruise(level flight) Alpha.  And indeed this system will positively identify and display stall for any type airplane everytime, consistantly.  You are right, you do need to know what your angle of attack is and how much lift is available to you and Alpha Systems AOA does this better than any other.

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_________________
Chris Crosby-CFI, CFII, CSIP
Sales/Technical Support
Alpha Systems AOA
763-506-9990 or 877-571-3770 ext.-205
chrisc@depotstar.com
www.alphasystemsaoa.com

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