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pavel569
Joined: 21 Dec 2007
Posts: 77
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 Posted: Tue Apr 15, 2008 11:05 am Post subject: AOA ports location |
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I'm working on 601XL right wing now and I'd like to know if anyone of you have installed AOA ports directly into the wing, i.e. Advanced Flight Systems AOA Instrument. I'm going to use Stratomaster Enigma or Voyager as my primary flight instrument and it has a AOA ports input, so only thing I need to do is to drill holes in the wing and connect them to the Stratomaster. I've looked for any advice for where they should be located over the net but found nothing. AFS website doesn't have specific ports location for the Zodiac. Any help will be appreciated.
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_________________
Pavel
CA
Zodiac 601XL
Stratus Subaru EA-81
Tail, flaps, ailerons, wings, fuselage, canopy done ...
"do not archive" |
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tigerrick(at)mindspring.c
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| Posted: Tue Apr 15, 2008 11:52 am Post subject: AOA ports location |
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Hi, Pavel.
To quote from the original AOA installation manual from 1998, inventor Jim Frantz wrote:
"There are some places where pressure ports should not be located...such as in line with the propeller wash, too close to the wing tip, and in areas too difficult to access. Generally 10 to 25% MAC and not too close to the wing tip will work well."
On Jim's Lancair, I recall seeing the ports about a foot in from the edge of the wingtip, and about the same distance back from the leading edge. As long as you get good differential pressures between the top and bottom skins that vary linearly with the wing's angle of attack, you'll be OK.
Rick Lindstrom
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craig(at)craigandjean.com
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| Posted: Tue Apr 15, 2008 11:52 am Post subject: AOA ports location |
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Rainier (head of MGL) wrote this on the Stratomaster Users Yahoo list:
"Positioning the ports is not hugely critical. A good rule of thumb would be perhaps 50% between leading edge and maximum profile thickness or perhaps a bit closer to the LE. It really is not very critical."
AFS's install manual gives some guidance on cord distance. I have embedded 5 pictures of the right wing of Mike Sigman’s 601XL (N7092N). Basically he placed the probes forward (but close to) the spar and outside (but close to) the outmost nose rib. Just don’t forget to offset the upper and lower probes so they don’t hit when you close the wing J.
My reading indicates that the placement is not extremely critical and that the calibration can accommodated a range of placements.
If the pictures don’t make it through let me know and I’ll mail them to you direct.
BTW: it is a good idea to provide a way to drain the upper port. If you look at the AFS documents you can see how they do this. you can build your own out of off-the-shelf parts: two flush static ports, some tubing and "T"s and a fuel tank drain.
-- Craig
[img]cid:image002.jpg(at)01C82EE6.35BE0320[/img]
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[img]cid:image014.jpg(at)01C82EE6.35BE0320[/img]
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-- Craig
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pavel569
Joined: 21 Dec 2007
Posts: 77
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| Posted: Tue Apr 15, 2008 12:10 pm Post subject: Re: AOA ports location |
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Rick, Craig
thanks a lot. I know the placement is not critical but why to try something that was done already, right? Craig, I'm planning to install a drain valve for the upper port as you recommend. Thanks again.
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Pavel
CA
Zodiac 601XL
Stratus Subaru EA-81
Tail, flaps, ailerons, wings, fuselage, canopy done ...
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lwinger
Joined: 21 Jun 2006
Posts: 229
Location: Tustin, CA
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| Posted: Tue Apr 15, 2008 12:20 pm Post subject: Re: AOA ports location |
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I am also using the AFS ports with the MGL Avionics EFIS. Here is what I wrote in my weblog at the time:
In order to place my AOA (Angle of Attack) ports, I needed to determine the wing chord. That is the front-to-back distance from the leading edge to the very back tip of the aileron or flap (depending on where you are measuring). After you determine the chord, you then figure 15% to 40% of that, and you have the range for port placement. In my case, I measured the chord about 150mm inboard of RR9 where it is 1470mm, placing the 15% location at 220mm and the 40% at 588mm. Given that range, I selected 255mm (17.3%) back from the leading edge, which is about 90mm ahead of the main spar rivet line (on the top of the wing). This allows room for the tubing coming from the upper port to have a short section that goes uphill, as specified in the plans.
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Larry Winger
Tustin, CA
Plans building 601XL/650 with Corvair
Installing fuel system
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