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BobbyPaulk(at)comcast.net
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 Posted: Wed Jul 22, 2009 5:28 am Post subject: heavy wing |
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List,
guys with the heavy wings. have you checked the Wash in / out of the wings. it should be no more than 10MM. ( about 3/8" ) mine was out about 1 1/2" and i know of at least 2 more A/C that were out that much or more. i had to shave off the rivet heads and drill a new skin to fit. this was one wing only. the other was O.K.
just a thought.
DO NOT ARCHIVE.
bobby
N131BP
[quote][b]
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PatrickW
Joined: 27 Oct 2006
Posts: 380
Location: Fort Worth, Texas
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| Posted: Wed Jul 22, 2009 9:28 am Post subject: Re: heavy wing |
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Excellent advice, and a great example of the nuggets of information that this forum is good for.
Knowing that there have been 601XL's that were still controllable with at least 1.5" of difference in the washout is valuable for those of us who are approaching First Flight.
- Pat
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Scotsman
Joined: 27 Aug 2007
Posts: 89
Location: Johannesburg, South Africa
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| Posted: Wed Jul 22, 2009 9:41 am Post subject: Re: heavy wing |
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Excuse the ignorance what is wash out?
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PatrickW
Joined: 27 Oct 2006
Posts: 380
Location: Fort Worth, Texas
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| Posted: Wed Jul 22, 2009 9:58 am Post subject: Re: heavy wing |
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| Scotsman wrote: | | what is wash out? |
Twist that is built into the wing to reduce the angle of attack the further out from the root you go. It's so the ailerons maintain effectiveness as you approach a stall.
Can read about it here: "http://en.wikipedia.org/wiki/Washout_(aviation)"
- Pat
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jaybannist(at)cs.com
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| Posted: Wed Jul 22, 2009 10:11 am Post subject: heavy wing |
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James,
Wash out is used to describe a deliberatly twisted wing; such that the tip is at a lower angle of attack than the root. This delays the stalling of the tip of the wing to retain aileron effectiveness after the root has stalled. In some production airplanes, the whole wing has this twist. In the Zodiac, only the aileron is twisted during construction to achieve this wash out.
Jay Bannister
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kkinney
Joined: 11 Jan 2006
Posts: 42
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| Posted: Fri Jul 24, 2009 6:17 am Post subject: Re: heavy wing |
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I'm attaching a PDF some of the RV guys use when they have a heavy wing. It's the first systematic approach to the problem I've seen.
I hope this helps those with a heavy wing.
Regards,
Kevin Kinney
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| Description: |
| A doc written for RV's with heavy wings |
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Download |
| Filename: |
Wing_Heavy.pdf |
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12.29 KB |
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711 Time(s) |
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