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  #11  
Old 03-24-2009, 03:20 AM
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bigbill25 bigbill25 is offline
 
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Location: Bend, OR
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Remember that the Van's RV-12 pitot tube has a "custom" bevel on it to make it work properly. That would need to be engineered on any replacement.

--Bill
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  #12  
Old 03-24-2009, 08:27 AM
Mich48041 Mich48041 is offline
 
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Location: Riley TWP MI
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Default AOA probe bevel

If Van's pitot tube has a bevel, then maybe it is the Dynon combination airspeed and AOA probe that has one straight port and one angled port.
Joe
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  #13  
Old 03-24-2009, 10:52 AM
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bigbill25 bigbill25 is offline
 
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It's just a tube. Here are a couple of Jerry's Sun 'n Fun pictures:





--Bill
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  #14  
Old 10-10-2011, 08:13 PM
Mich48041 Mich48041 is offline
 
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Default Homemade AOA probe for Dynon

I installed a homemade AOA probe on my RV-12 wing and connected it to the Dynon D-180. It works great! Total cost is about $10.
Parts list:
2 sports ball inflating needles
1 plastic plug with 1/8" NPT threads
1/16" I.D. 1/8" O.D. Tygon tubing available here:
http://www.usplastic.com/catalog/sea...h=57102&page=1
See pictures for location of hole to be drilled in leading edge of wing. Put a dab of 5-Minute epoxy glue on the needle, and stuck it into the hole from the outside of the wing. A piece of tape held the needle in place until the glue set (24 hours). The hole should be drilled in the same rib bay that is accessible through the stall vane access cover. The Tygon tubing is a tight fit over the inflating needle. No clamp is necessary. The plastic plug is used to make a bushing to adapt the inflating needle to the AOA port on the back of the Dynon D-180. After cutting the square head off from the plastic plug, ream out the hole in the plug to 1/4". Put the inflating needle in a vise, threaded end up. Use wood to protect the needle from the vise jaws. Briefly heat the needle with a torch. Push and turn the plastic plug down onto the needle threads. Too much heat will damage the needle or plastic. The object is for the needle threads to melt their way into the plastic plug. A tap could be used instead of heat, but the taps are an odd size, difficult to find, and expensive.
http://www.tapsndies.com/catalog/ite...55/6851684.htm
I routed the Tygon tube along the inside of the fuselage instead of through the center tunnel.
Another needle (with the threads cut off) can be used as a coupling at the wing root if desired.
After calibrating the AOA per Dynon D-180 installation manual, the AOA indication appeared on the screen and I began using it. Even though I have never used AOA before, I found the display easier to interpret than airspeed numbers. On that very first flight using AOA, I was able to land on a very short private strip without floating off the end of the runway.
Joe Gores
Advantages of AOA:
http://www.oshkosh365.org/saarchive/...2001_04_20.pdf






Last edited by Mich48041 : 05-18-2016 at 08:45 PM. Reason: Corrected
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  #15  
Old 10-10-2011, 09:57 PM
Hal-san Hal-san is offline
 
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Joe,
how much of the tubing does it take to make the run from the wing to the D180?
thanks
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  #16  
Old 10-10-2011, 10:23 PM
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DonFromTX DonFromTX is offline
 
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Location: La Feria Texas
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I took the easy way out Joe, since I had to relocate my pitot anyway because of the Honda engine, I found Dynon sells a pitot/AOA fixture. I found a gal wanting to sell a brand new one over in the classified section and it became mine.
I still have to screw it on the wing and run some tubing with disconnects for the wing junction. I never had one either, but since it was already on the Dynon display, what the heck! I have been reading for years how great they are.
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  #17  
Old 10-11-2011, 01:46 AM
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Geico266 Geico266 is offline
 
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Joe, great job! It never ceases to amaze me of the talent on VAF.
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  #18  
Old 10-11-2011, 08:13 AM
Mich48041 Mich48041 is offline
 
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Quote:
how much of the tubing does it take to make the run from the wing to the D180? thanks Harold Irvine
Harold,
I did not measure the tubing. A rough estimate is 15 feet. Tygon does not cost much. I would buy 20 feet.
Joe Gores
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  #19  
Old 10-11-2011, 10:10 AM
dick seiders dick seiders is offline
 
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Joe, you are ahead of the curve as usual. Thanks for the idea!
Dick Seiders
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  #20  
Old 10-11-2011, 06:27 PM
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MartySantic MartySantic is offline
 
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Joe,

Kudos. The idea is neat, cheap and is so eloquent. Keep the ideas coming! It is on my ToDo list.
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