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  #101  
Old 05-25-2013, 09:04 PM
rv3flier's Avatar
rv3flier rv3flier is offline
 
Join Date: Apr 2008
Location: La Center WA
Posts: 114
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Thanks Joe, I'll give that a try.
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  #102  
Old 06-01-2013, 12:34 PM
Jaknjoan Jaknjoan is offline
 
Join Date: Jan 2005
Posts: 239
Default Dynon AOA

Recently, at the request of the current owner of an RV-12 that I built, I installed the necessary hardware as pioneered by Joe Gores to activate the AOA in the Dynon D180. After calibration by the owner, the AOA worked as prescribed.

Following the -12 success, I thought I would try a similar homebrewed adaptation in my RV-4 in which I have a Dynon D10A, also with the same AOA capability as the D180. I originally bent the AOA tube 30 degrees less than the pitot. Following a calibration flight, the AOA chevron on the Dynon showed the red and yellow and part of the green. The alarm activated as soon as I reduced power in the landing configuration. All AOA indications showed a stall prematurely. I next changed the angle of my AOA tube to 40 degrees down, after which a did a calibration flight again, with no better luck than the original 30 degree orientation. Both my pitot and my AOA are 1/4 inch tubing. I know in the -12, the 1/4 inch pitot is in the center of the spin and the leading edge orifice is 1/16th ID all the way to the D180. My thought is that the size of the line running from the AOA port to the D10A should not matter, but possibly it does. Can anyone enlighten me regarding this? The long and short of the matter is that I'm not coming up with any valuable AOA information in my -4 at this time.

Are then any other RVers out there that have had success with the Dynon AOA on the standard airfoil used on all other 2 place RVs?

Following is a link to photos of my installation:

https://plus.google.com/photos/11553...53107945464017













https://plus.google.com/photos/11553...53107945464017
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  #103  
Old 06-01-2013, 12:38 PM
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Mel Mel is offline
 
Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
Default

I built my own pitot/AOA tube and used a 60? delta as measured on Dynon's pitot.
It has worked flawlessly for several years.
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
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USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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  #104  
Old 06-01-2013, 03:14 PM
Jaknjoan Jaknjoan is offline
 
Join Date: Jan 2005
Posts: 239
Default AOA

Quote:
Originally Posted by Mel View Post
I built my own pitot/AOA tube and used a 60? delta as measured on Dynon's pitot.
It has worked flawlessly for several years.
Thanks Mel. I had read numbers of 30 and 60, and both are right, depending on point of reference. I rebent my AOA to be 60 degrees less than the pitot and it appears that may work.

Techie terms like "delta" are great but straight talk in layman's terms leave less to the imagination.
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  #105  
Old 07-20-2013, 07:27 AM
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bhassel bhassel is offline
 
Join Date: Jan 2005
Posts: 963
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Quote:
Originally Posted by mrt890 View Post
Installed the tubing for an AOA probe and used an LP4-5 rivet for the probe. Positioned it per Joe Gores' recommendation. After calibration, performed power-off stall and landing. AOA functioned very well. Leading edge is clean, rivet looks like it belongs there.
Do you have any pictures of the LP4-5 rivet installation? Does the tubing fit on the back of the rivet location ok?

Thanks,

Bob
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  #106  
Old 07-20-2013, 08:09 AM
John-G John-G is offline
 
Join Date: Jan 2012
Location: Northeast Ohio
Posts: 685
Default This worked for me

Bill,

I?m building E-AB and using flush rivets that are in size, equivalent to LP4-3 rivets. In the link to the first photo below you can see how I attached the AOA tubing onto a rivet with the mandrel removed using a block of wood with a hole in it as a backstop during my initial testing. Basically, I used a 1/8? ID vinyl tubing sleeve slid over the shop head of the rivet which made a very snug fit. Next the tiny Tygon tubing was forced inside the 1/8? tubing making another tight fit.

As viewed in the second photo bellow, during final assembly, sensor safe blue Permatex silicone sealant was placed around the base of the rivet and the 1/8? tubing sleeve slid over the rivet to seat into the silicone. Then silicone was slathered over the outside of the 1/8? tube/rivet junction and the Tygon tube to 1/8? sleeve junction and let to dry for a couple of days before securing the tubing in final position. Hindsight being 20/20, should have placed some tape around the area because I made quite a mess while trying to insure a good solid seal around the rivet ? had a blob of silicone on my gloves I didn?t notice and ... well you can see the results.

http://4.bp.blogspot.com/-bf0Asxsrkl...0/DSC03738.JPG

http://4.bp.blogspot.com/-_fDIzx1L1I...0/DSC03740.JPG
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  #107  
Old 07-20-2013, 09:42 AM
Dave12 Dave12 is offline
 
Join Date: Oct 2010
Location: Elkton, Md.
Posts: 1,652
Default

Bob, I don't remember what size it was, but I just ordered the rivet that Van's calls out for the static port and used it instead of the inflator needle. I then drilled the skin according to Master Thinker Joe's instructions. I used Tygon tubing and had to heat the tubing with a hair dryer to expand it enough to slide over the rivet. I really like the look, it's not even noticable. It works great. BTW, I used the fittings referenced earlier in this thread from McMaster and Carr and they worked very well.
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Wag Aero Sport Trainer built,sold and wrecked
N588DF RV12 #336 built, sold and alive and well in New York
N73DF RV12 #244 built, sold and alive and well in Florida
N91 RV RV9 I wish I could say I built this one! Mark Santoleri hit the ball out of the park on this gem.
Currently restoring a 1978 Citabria GCBC
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  #108  
Old 07-20-2013, 06:50 PM
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Tony_T Tony_T is offline
 
Join Date: Dec 2008
Location: Lacey, WA
Posts: 1,365
Default Don't like AOA!

Chatty Patty yelling STALL, STALL, was intolerable. Turned that OFF. The beeping on landing is almost as bad, my wifey got big eyes and said "WHAT'S THAT?" I find the beeping to be distracting and annoying rather than helpful. Landing is a phase of flight that I particularly enjoy. The beeping ruins it. now have that turned that OFF too. I don't feel the distraction helps in flying this light RV-12 at all. Maybe in a heavier airplane with less control feel I would appreciate all these warnings.

I have been well trained and can do short field landings just fine without AOA, thank you.

I have not given up on it completely, I think I can recalibrate it and improve its performance, but I doubt I will get to like it.

There, I've said it. Blasphemy, I know. I will slink off now and say my penance.

Tony
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Last edited by Tony_T : 07-20-2013 at 06:53 PM.
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  #109  
Old 07-20-2013, 08:45 PM
NASA515 NASA515 is offline
 
Join Date: Nov 2011
Location: Hansville, Washington
Posts: 536
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Saints don't need to say penance, San Antonio.....

Bob B.
N737G
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  #110  
Old 07-21-2013, 05:05 AM
Dave12 Dave12 is offline
 
Join Date: Oct 2010
Location: Elkton, Md.
Posts: 1,652
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Agreed, turn off the noisy one. A/S and Alt. are used visually, why not use the aoa visually also?
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Wag Aero Sport Trainer built,sold and wrecked
N588DF RV12 #336 built, sold and alive and well in New York
N73DF RV12 #244 built, sold and alive and well in Florida
N91 RV RV9 I wish I could say I built this one! Mark Santoleri hit the ball out of the park on this gem.
Currently restoring a 1978 Citabria GCBC
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