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WING BUILD START

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ltaylor02(at)Chartermi.ne
Guest

Posted: Thu Aug 06, 2009 3:00 am Post subject: WING BUILD START

I'm just beginning my Model IV wing layout.  I  have the original 1993 manual and the newest build manual from Kitfox for the  IV.  Both manuals have language that infers that the wing is constructed in  the jig with the wing upright, "..place the spars with the strut brace outlines  facing down."  One manual indicates placing the washout block under the  rear spar while the other indicates placing under the front spar.  Both  have many pictures showing the wing being constructed in its inverted  position.  Two manuals--perhaps too much information.  I'd appreciate  any guidance as to what the wing build orientation is (if it matters), and under  which spar is the 1/2" washout block, which does matter.  I also  realize that the washout block's position if relative to the wing being  constructed upright or inverted.    

  

 Thanks in advance,

 Lane

    [quote][b]

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Tom Jones

Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA

Posted: Thu Aug 06, 2009 4:58 am Post subject: Re: WING BUILD START

Lane, you will end up turning that wing over about 500 times before you finish it.  It is very important to have the washout block under the correct end of the correct spar when you start.



I'll go get my builders log and look at the pictures so I can remember how I did it.



Okay I am looking at a picture.  I started with the wing upside down.  The washout block is under the Front spar tip.



Now before you go beyond the point of no return wait for someone else on the list to verify this.  Just for a double check.



Be sure to build one left wing and one right wing.  If you use the same jig you will need to move the washout block so it is under the front spar tip when the wing is upside down.[/i][/u]

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_________________
Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA

lcfitt(at)sbcglobal.net
Guest

Posted: Thu Aug 06, 2009 5:59 am Post subject: WING BUILD START

I second Tom's position.



The plan is to have the outboard end of the wing at less angle of attack 

during flight.  This improves stall characteristics as the outboard end will 

stall slightly later than the root end.  So if the wing is upright, the 

washout block will be at the trailing edge of the outboard end.  If the wing 

is inverted, the block would be under the leading edge, outboard.



Excellent advice on buildint one right and one left wing.  Sounds simple, 

but it has been done the other way - Oops.



Lowell Fitt

Cameron Park, CA

Second Build Model IV-1200 R-912 UL

Covering Fuselage



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jdmcbean(at)kitfoxaircraf
Guest

Posted: Thu Aug 06, 2009 7:47 am Post subject: WING BUILD START

Lane,  

                Remember the intent is to have less angle of attack at the outboard (tip) leading edge than the root.  ½” block equals about 1 degree of washout (twist)  

Fly Safe !!

 John & Debra McBean

 Ph 208.337.5111

 www.kitfoxaircraft.com 

 "The Sky is not the Limit...  It's a Playground"   

   

   

       

From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of lst

 Sent: Thursday, August 06, 2009 4:57 AM

 To: kitfox-list(at)matronics.com

 Subject: WING BUILD START  

  

  

     

I'm just beginning my Model IV wing layout.  I have the original 1993 manual and the newest build manual from Kitfox for the IV.  Both manuals have language that infers that the wing is constructed in the jig with the wing upright, "..place the spars with the strut brace outlines facing down."  One manual indicates placing the washout block under the rear spar while the other indicates placing under the front spar.  Both have many pictures showing the wing being constructed in its inverted position.  Two manuals--perhaps too much information.  I'd appreciate any guidance as to what the wing build orientation is (if it matters), and under which spar is the 1/2" washout block, which does matter.  I also realize that the washout block's position if relative to the wing being constructed upright or inverted.      

    

   

    

Thanks in advance,  

    

Lane  

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       [quote][b]

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ltaylor02(at)Chartermi.ne
Guest

Posted: Thu Aug 06, 2009 12:41 pm Post subject: WING BUILD START

Thanks Tom and John confirms as well.

---

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ltaylor02(at)Chartermi.ne
Guest

Posted: Thu Aug 06, 2009 12:41 pm Post subject: WING BUILD START

Thanks again John; great to be able to confirm with  experts and undoubtedly I'll look for more confirmation as I work through this  very exciting build.  

 [quote]   ---

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icubob(at)gmail.com
Guest

Posted: Thu Aug 06, 2009 4:57 pm Post subject: WING BUILD START

lane,

  it is easy to reason this out. washout is made so the root end of the wing quits ''flying'' before the tip. this is so a stall wont make the airplane roll over. it will make the nose drop. so the wing is twisted so the root has the most angle of attack and stalls first. the tips have less angle of attack and are still ''flying'' as the nose drops. airspeed now picks up and the whole wing is soon generating lift again.

     bob noffs

 On Thu, Aug 6, 2009 at 7:58 AM, Tom Jones <nahsikhs(at)elltel.net (nahsikhs(at)elltel.net)> wrote:

 [quote]--> Kitfox-List message posted by: "Tom Jones" <nahsikhs(at)elltel.net (nahsikhs(at)elltel.net)>

 

Lane, you will end up turning that wing over about 500 times before you finish it.  It is very important to have the washout block under the correct end of the correct spar when you start.



I'll go get my builders log and look at the pictures so I can remember how I did it.

 

Okay I am looking at a picture.  I started with the wing upside down.  The washout block is under the Front spar tip.[u]



Now before you go beyond the point of no return wait for someone else on the list to verify this.  Just for a double check.

 

Be sure to build one left wing and one right wing.  If you use the same jig you will need to move the washout block so it is under the [u]front spar tip when the wing is upside down.



--------

Tom Jones

Classic IV

 503 Rotax, 72 inch Two blade Warp

Ellensburg, WA





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ltaylor02(at)Chartermi.ne
Guest

Posted: Fri Aug 07, 2009 2:44 am Post subject: WING BUILD START

Thanks Bob.  I'm grateful for all the  expertise and feedback.  I plan to be "stalling cleanly" by next  summer.

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