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Angle of Attack

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jimpuglise(at)comcast.net
Guest

Posted: Mon Jul 23, 2007 11:53 am Post subject: Angle of Attack

I am installing a Dynon ASI / AOA indicator.  The pitot tube should be parallel to the direction of flight when in cruise.  In order to install it, it is necessary to set it with reference to the chord of the wing, but I don't see anywhere what the angle of attack is.  I also thought the spar might be 90 degrees from the chord but it does not appear that that is the case.  

  

 How have others who are using the Dynon pitot tube set it?  

  

 Jim Puglise, A-283

  [quote][b]

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josok-e(at)ukolo.fi
Guest

Posted: Mon Jul 23, 2007 12:56 pm Post subject: Angle of Attack

Hi Jim,



Can't see that this has to be absolutely without tolerance exactly parallel. The dynon aoa indicator will be learning the exact difference between the pitot and stall tube later during a series of test stalls. In will try to use the standard europa pitot and the stall warner tube as inputs. Don't know if that works, but will find it out in a week or so. I have the dynon asi/stall pitot, but would prefer not to pull more tubes through the plane. 



Kind Regards,



Jos Okhuijsen

Visit -  www.EuropaOwners.org

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rob(at)hyperion-ef.com
Guest

Posted: Mon Jul 23, 2007 2:23 pm Post subject: Angle of Attack

The angle of incidence (NOT to be confused with the AOA) is set to 2.5 degrees as measured at the wing root per the Builders Manual chapter on “Wing to Fuselage Assembly”.  That is, the chord is 2.5 degrees up at the leading edge, relative to the “waterline” of the fuselage (the waterline reference in this case being the pilot’s side door sill).  Since the wing is designed to stall first at the root, the angle of incidence decreases toward the wing tip.  I don’t think that the manual tells us how much the angle of incidence varies but it should not be necessary to know this for setting the pitot tube angle.    

   

Since a fixed pitot tube can not be set parallel to the relative wind except at specific combinations of gross weight and airspeed, I suspect that what Dynon really wants is for the pitot tube be parallel to the longitudinal axis of the airframe, and close to the angle of incidence of the wing, with compensation for any deviation from its preferred angle of incidence being applied by calibration of the instrument.  

   

   

Best regards,  

   

Rob Housman  

Irvine, California  

Europa XS Tri-Gear  

S/N A070  

Airframe complete  

       

From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of jimpuglise(at)comcast.net

 Sent: Monday, July 23, 2007 12:52 PM

 To: europa-list(at)matronics.com

 Subject: Angle of Attack  

  

  

     

I am installing a Dynon ASI / AOA indicator.  The pitot tube should be parallel to the direction of flight when in cruise.  In order to install it, it is necessary to set it with reference to the chord of the wing, but I don't see anywhere what the angle of attack is.  I also thought the spar might be 90 degrees from the chord but it does not appear that that is the case.    

    

   

    

How have others who are using the Dynon pitot tube set it?    

    

   

    

Jim Puglise, A-283  

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       [quote][b]

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jimpuglise(at)comcast.net
Guest

Posted: Mon Jul 23, 2007 2:43 pm Post subject: Angle of Attack

Jos-

  

 If you want to use the AOA indicator, they say that you must use the Dynon pitot.  It has a second hole in it at about a 60 degree angle from the pitot and the Dynon computer looks at the difference between the two inputs.  I have installed both that and the Europa pitot and will use the Europa pitot to drive a steam gauge backup ASI and the Dynon pitot to drive the Dynon.  I will share the static source from the Europa tube.   

  

 [quote]-------------- Original message -------------- 

From: "josok" <josok-e(at)ukolo.fi> 



 	  Quote: 	
		   --> Europa-List message posted by: "josok" 

 

 Hi Jim, 

 

 Can't see that this has to be absolutely without tolerance exactly parallel. The 

 dynon aoa indicator will be learning the exact difference between the pitot and 

 stall tube later during a series of test stalls. In will try to use the standard 

 europa pitot and the stall warner tube as inputs. Don't know if that works, but 

 will find it out in a week or so. I have the dynon asi/stall pitot, but would 

 prefer not to pull more tubes through the plane. 

 

 Kind Regards, 

 

 Jos Okhuijsen 

 

 

 

 

 

 

 Visit - www.EuropaOwners.org 

 

 

 

 

&  gt; [b][b]

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grahamsingleton(at)btinte
Guest

Posted: Mon Jul 23, 2007 3:14 pm Post subject: Angle of Attack

Jim

does the Dynon use the 60deg. hole as static? or does it have two pitots 

and a static.?

Graham



jimpuglise(at)comcast.net wrote:

 	  Quote: 	
		   Jos-

  

 If you want to use the AOA indicator, they say that you must use the 

 Dynon pitot.  It has a second hole in it at about a 60 degree angle from 

 the pitot and the Dynon computer looks at the difference between the two 

 inputs.  I have installed both that and the Europa pitot and will use 

 the Europa pitot to drive a steam gauge backup ASI and the Dynon pitot 

 to drive the Dynon.  I will share the static source from the Europa tube.   

  

 

     -------------- Original message --------------

     From: "josok" <josok-e(at)ukolo.fi>

 

      > 

      >

      > Hi Jim,

      >

      > Can't see that this has to be absolutely without tolerance

     exactly parallel. The

      > dynon aoa indicator will be learning the exact difference between

     the pitot and

      > stall tube later during a series of test stalls. In will try to

     use the standard

      > europa pitot and the stall warner tube as inputs. Don't know if

     that works, but

      > will find it out in a week or so. I have the dynon asi/stall

     pitot, but would

      > prefer not to pull more tubes through the plane.

      >

      > Kind Regards,

      >

      > Jos Okhuijsen

      >

      >

      >

      >

      >

      >

      > Visit - www.EuropaOwners.org

      >

      >

      >

      >

     & gt; **

 

 **

 

 

 **


	


-- 

Graham Singleton



Tel: +441629820187

Mob: +447739582005

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josok-e(at)ukolo.fi
Guest

Posted: Mon Jul 23, 2007 11:41 pm Post subject: Angle of Attack

It's pitot and AOA, it relies on a standard static. The thing i would like tom  try is to use the stall warner vac. split to the AA input on the Dy non. The result might be in range for the setup of the AA and if not i will install the massive and heavy Dy non stuff. Will keep you posted, results in a week or so, when i have a second pilot to be able to play with adjustments in the air. Oh, in case somebody is interested: The factory stall Warner set, which normally also needs adjusting was spot on on trial stalls without touching the setup screw. 



Kind Regards,



Jos Okhuijsen

Visit -  www.EuropaOwners.org

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jimpuglise(at)comcast.net
Guest

Posted: Tue Jul 24, 2007 11:09 am Post subject: Angle of Attack

Graham-

  

 My understanding is that the two probes are not static and that it will require another static port.  Essentially, both are pitot but there will always be a pressure differential between them and that differential is what is used to calculate AOA.  My plan is to use the static port from the Europa probe for both the conventional ASI and the Dynon.  

  

 Jim 

  

 [quote]-------------- Original message -------------- 

From: Graham Singleton <grahamsingleton(at)btinternet.com> 



[quote] --> Europa-List message posted by: Graham Singleton 

 

 

 Jim 

 does the Dynon use the 60deg. hole as static? or does it have two pitots 

 and a static.? 

 Graham 

 

 jimpuglise(at)comcast.net wrote: 

 > Jos- 

 > 

 > If you want to use the AOA indicator, they say that you must use the 

 > Dynon pitot. It has a second hole in it at about a 60 degree angle from 

 > the pitot and the Dynon computer looks at the difference between the two 

 > inputs. I have installed both that and the Europa pitot and will use 

 > the Europa pitot to drive a steam gauge backup ASI and the Dynon pitot 

 > to drive the Dyno  n. I w ill share the static source from the Europa tube. 

 > 

 > 

 > -------------- Original message -------------- 

 > From: "josok" 

 > 

 > > --> Europa-List message posted by: "josok" 

 > > 

 > > Hi Jim, 

 > > 

 > > Can't see that this has to be absolutely without tolerance 

 > exactly parallel. The 

 > > dynon aoa indicator will be learning the exact difference between 

 > the pitot and 

 > > stall tube later during a series of test stalls. In will try to 

 > use the standard 

 > > europa pitot and the stall warner tube as inputs. Don't know if 

 > that works, but 

 > > will find it out in a week or so. I have the dynon asi/stall 

 > pitot, but would 

 > > prefer not to pull more tubes through the plane. 

 > > 

   > &  ======  [quote][b]

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astills

Joined: 24 Apr 2007
Posts: 6
Location: Phoenix,Ariz

Posted: Tue Jul 24, 2007 11:32 am Post subject: Angle of Attack

For those of you who want to know about the Dynon probe, I have installed on my plane. The Dynon probe is Pitot and AOA only…no static. I  

installed mine on the starboard wing of the Europa probe and ran back to the panel. So I have 2 pitot’s , an AOA and a static. The location I used   

is the exact spot on the opposite wing from the Europa static and pitot. I have used both pitots as I have an airspeed indicator and the Dynon and both are exactly   

the same on indicated airspeed.  After using for a while, I could get rid of the Winter airspeed indicator as I don’t use it much. I also have the stall   

warner and am thinking about getting rid of that as the AOA takes care of all stall alarms. It has a solid or progressive alarm that you set up when  

you calibrate the AOA. The location of the probe should be as close to the Europa location as possible, only on the starboard wing. With the calibration  

that you go through it does not have to be exact. The calibration is set in flight (first in straight and level ,then in all stalls, with and without flaps).   

I am really impressed with the Dynon and have added the EMS and pulled the GRT EMS out.   

   

Al Stills  

N625AZ 50+ Hrs and counting  

   [quote] 	  Quote: 	
		   	
[b]

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grahamsingleton(at)btinte
Guest

Posted: Tue Jul 24, 2007 3:31 pm Post subject: Angle of Attack

thanks Jim

Graham



jimpuglise(at)comcast.net wrote:

 	  Quote: 	
		   Graham-

  

 My understanding is that the two probes are not static and that it will 

 require another static port.  Essentially, both are pitot but there will 

 always be a pressure differential between them and that differential is 

 what is used to calculate AOA.  My plan is to use the static port from 

 the Europa probe for both the conventional ASI and the Dynon. 

  

 Jim

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