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AOA Provisions for Installation

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jeff(at)westcottpress.com
Guest

Posted: Fri Mar 17, 2006 9:08 am Post subject: AOA Provisions for Installation

Builders,



I'm at the point in the construction of the outboard leading edge  

where I have to decide if I'm going to install the conventional stall  

warning device.  Can anyone explain how the Angle of Attack indicator  

works and what provisions have to made for it's installation.



Thank you,



Jeff Carpenter

40304

N410CF

rene(at)felker.com
Guest

Posted: Fri Mar 17, 2006 9:58 am Post subject: AOA Provisions for Installation

I did both, but because of the placement of the ports feel that you can wait

on making the AOA decision until later, so you have time to do some research

on the AOA.  Here is my 1 minute explanation of my understanding.



The AOA uses two ports, one to top of the wing and one on the bottom of the

wing to sense local pressure.  From these measurements, the AOA calculates

the angle of attack of the wing and thus gives you an indication of how

close you are to stalling.



Rene' Felker

--

rvbuilder(at)sausen.net
Guest

Posted: Fri Mar 17, 2006 11:01 am Post subject: AOA Provisions for Installation

 Basically it uses differential pressure to calculate AoA.  You can get more info from here: http://advanced-control-systems.com/AOAfaqs/aoafaqs.htm.

 

   Also, you can get the wing kit for $400 so you can install that now and decide on which system later assuming you go with Rob Hickman's.

 

 

 Michael Sausen

 RV-10 #352 Working on Fuselage

 Do Not Archive

 

 --

zackrv8

Joined: 14 Jan 2006
Posts: 133

Posted: Fri Mar 17, 2006 1:34 pm Post subject: Re: AOA Provisions for Installation

Jeff,



  The stall warning that Vans supplies is very basic.  I wanted something better.  The AOA system is much better.  As you know, a wing only stalls when it exceeds it's critical angle of attack.  An aircraft can be stalled at any speed and weight.  The AOA will give you plenty of warning when approaching a stall whereas the stall warning horn that is supplied in the kit gives you a warning too close to a stall.  



  Remember, you will be hauling up to 4 people in your 10 so why not protect yourself and your passengers a little better?  As you know, your stall speed changes with gross weight and CG loading.  The AOA guage takes this into account and might just save your pink a$$ someday.



  AOA is not for everyone.  If you never used it, you probably won't see the need to fork out $1500 for one.  However,  If you have used one, and understand how it works....then it's hard to be without one.



  My 10 will have the AOA Pro installed.  I just installed the ports in the leading edge yesterday.  Piece of cake.  The tiny pin holes that you put in the wing look a lot better than that piece of metal sticking out of the leading edge.



Zack

_________________
RV8 #80125
RV10 # 40512

jjessen(at)rcn.com
Guest

Posted: Fri Mar 17, 2006 2:12 pm Post subject: AOA Provisions for Installation

One question that was raised in my mind one or two posts back was:  Is there

any good reason to have both?   



John Jessen

  ~328 (empennage)



--

rvbuilder(at)sausen.net
Guest

Posted: Fri Mar 17, 2006 2:54 pm Post subject: AOA Provisions for Installation

   Probably a personal preference.  Rob is supposed to have a profile for the RV-10 and will load it prior to shipping.  You will still want to calibrate it to your aircraft when you fly though.

 

  Anyway my point is the only reason I can think of to have both is when you are calibrating the AoA.  Other than that the AoA should satisfy the regs as a stall warning device.  I decided to not put in the Van's tab and riveted the two holes shut.

 

 

 Michael Sausen

 RV-10 #352 Working on Fuselage

 Do Not Archive

 

 --

rene(at)felker.com
Guest

Posted: Fri Mar 17, 2006 3:14 pm Post subject: AOA Provisions for Installation

My reasoning for two systems was simple, the Vans stall warning is simple,

mostly mechanical and easily tested during preflight.  Where the AOA is a

much better "energy reserve" indicator, but more complicated and thus I

would think it was more susceptible to failure. Thus the vans stall warning

is a low tech backup.



Rene' Felker



--

RVFOURME(at)aol.com
Guest

Posted: Sat Mar 18, 2006 1:31 am Post subject: AOA Provisions for Installation

To all  you industrious folks out there building RV-10's and  interested in AOA instrumentation: Having built 2 RV-4's and not willing to  shell  out the money for a store-bought AOA, I  made my  own.................and it works fantastic !!  It includes an aluminum  wedge with a small .060 drilled hole on each face of the wedge to sense the  difference of pressure, two lines going to the panel instrument and the   instrument  itself  is a Dwyer meter which measures 1/2 inch of  water  column at full deflection. I will NEVER   build another RV  without having this  instrument as my primary gauge for takeoff and  landings. I don't even look at the airspeed indicator any more while in  the  pattern: it's  irrelevant. Total cost for the homemade  system?  $100.00. Hope this can help all of you on a budget, as I  always seem to be  

  

 Craig Ponnequin

sam.marlow

Joined: 25 Feb 2006
Posts: 99

Posted: Sat Mar 18, 2006 8:04 am Post subject: AOA Provisions for Installation

DO you have a web site describing installation? We need more info! Thanks,

 Sam

 Fuse

 

 RVFOURME(at)aol.com (RVFOURME(at)aol.com) wrote:

  	  Quote: 	
		              To all  you industrious folks out there building RV-10's and interested in AOA instrumentation: Having built 2 RV-4's and not willing to shell  out the money for a store-bought AOA, I  made my own.................and it works fantastic !!  It includes an aluminum wedge with a small .060 drilled hole on each face of the wedge to sense the difference of pressure, two lines going to the panel instrument and the  instrument  itself  is a Dwyer meter which measures 1/2 inch of water  column at full deflection. I will NEVER   build another RV without having this  instrument as my primary gauge for takeoff and landings. I don't even look at the airspeed indicator any more while in the  pattern: it's  irrelevant. Total cost for the homemade system?  $100.00. Hope this can help all of you on a budget, as I always seem to be  

    

   Craig Ponnequin

Jerry Grimmonpre'

Joined: 09 Jan 2006
Posts: 144
Location: Huntley, Illinois 60142

Posted: Mon Mar 20, 2006 12:34 pm Post subject: AOA Provisions for Installation

Hi Craig ...

 You must be a rather smart dude to figure out an AOA instrument which works  on Delta P.  There are a bunch of 

 us who would like to know more about your homemade creation.  Is it  possible for you to share how you did it?

 Regards ... 

 Jerry Grimmonpre'

 RV8A

 Huntley Illinois

 Do Not Archive

 [quote]   ---

Jerry Grimmonpre'

Joined: 09 Jan 2006
Posts: 144
Location: Huntley, Illinois 60142

Posted: Mon Mar 20, 2006 12:59 pm Post subject: AOA Provisions for Installation

Hi Craig ...

You are a smart dude to figure out an AOA instrument which works on Delta P. 

I have a hunch there's are a bunch of us who would like to know more about 

your homemade creation.  Is it possible for you to share how you did it?

Regards ...

Jerry Grimmonpre'

RV8A

Huntley Illinois

Do Not Archive



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