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macleod(at)eagle.ca
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 Posted: Mon Mar 19, 2007 7:23 pm Post subject: LRI positioning |
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Group:
After reviewing the potential benefits of a LRI indicator and noting the comments of the list members I have decided to install an AOA probe in my right wing (the one I am currently assembling).
I plan to mount the AOA probe on the inboard side of rear rib #5 (yes, inside the wing locker - should give easy access) at the same distance from the leading edge as the pitot probe on the left wing. I am going to make the probe so that it extends 10 inches below the wing. I will attach it to the rib with one 3/16 inch AN bolt until I have it calibrated at which time I will add an A5 rivet to lock it in position.
My questions:
a) Is there a better location for the probe? (is the probe far enough from the fuselage? would rib #7 be better?)
b) Any problems attaching it directly to the rib? (as the tiedown ring is attached) or do I need a doubler?
c) Is 10 inches enough given the HUGE XL wing?
Thanks for your help
Mike in Ontario
601XL working on wings
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japhillipsga(at)aol.com
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| Posted: Tue Mar 20, 2007 7:40 am Post subject: LRI positioning |
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Mike, when I mounted mine I tried to do as much "brain" work as I could. I figured that most traffic patterns turn to the left and as such the left wing would be the most likely to stall first and result in a spin at low altitude. Knowing when the left wing was about to stall was important close to the ground. Second, on my XL (as well as most other XLs especially when only the left seat is filled) the left wing is heavier making it the best candidate for a stall. I put the probe on the left side after I built and flew some 70 hours. I mounted it directly behind the main spar outside the pitot tube in clean air. That way I got the most strength in the thin metal of the wing bottom. I atta ched the probe to a plate as big as my hand, cut the hole in the bottom skin (painful to lay tools on finished paint) drilled the holes, dimpled the skin and solid riveted in nut plates inside the skin (similar to bellcrank access plates). The larger holes allows for the access to the tubing I ran through the wing ribs. Whole thing was a full weekend and then I needed about a half dozen short hops to adjust the angle of the probe just right. Good luck, Bill of Georgia
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Ron Lendon
Joined: 10 Jan 2006
Posts: 685
Location: Clinton Twp., MI
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| Posted: Tue Mar 20, 2007 2:38 pm Post subject: Re: LRI positioning |
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Mike, I haven't flown it yet but I did a little research and found that the boundary layer of that wing isn't all that large. So I placed the center of the dynon AOA pitot 5.5" from the wing surface. It is located in the same place that the print shows 150mm back from the spar cap rivet line and just outboard of rib 5.
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_________________
Ron Lendon
WW Corvair with Roy's Garage 5th bearing
CH 601 XLB
N601LT - Flying
http://www.mykitlog.com/rlendon
Corvair Engine Prints:
https://sites.google.com/site/corvairenginedata/ |
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