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Retro Fitting MG Wings

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europa(at)triton.net
Guest

Posted: Tue Aug 15, 2006 6:27 pm Post subject: Retro Fitting MG Wings

We are trying to retrofit glider wings to our XS fuselage. We completed the  spar bush installation per Chapter 8 with no problem. Moving to Chapter 27a, we  are able to fit the port wing to the fuselage and insert the EUR047 bolts. The  top skin of the port wing forward of the spar does just touch the fuselage.  However, we are unable to fit the stbd wing. It seems as though the wing will  not go far enough into the fuselage, by about ¼ inch. The top skin of the stbd  wing forward of the spar is hitting the side of the fuselage and preventing the  wing from sliding in as far as necessary. We also notice that the gap between  the GDG01 jigs and the lift drag pin sockets (W26 & W27) on the stbd wing is  large - over ½ inch while it is small on the port wing - 1/8 inch. Is this a  common problem and is the solution to trim the top skin? 

We have also noticed that the flap cross tube FL15 hits the top skin of the  wing on both sides. Is the solution to trim the top skin to clear? 

When fitting the short wings to the fuselage, we stretched a string from wing  tip to wing tip to check for sweep (Chapter 27-4). The MG manual does not  include this step. It only requires measurement of the wings from the tailplane  torque tube (Chapter 27a-2). Should we also check sweep with a string as  before? 

Finally, the thickness of the spar bushings seems to be greater on the MG  wings. Is a different length spar pip pin required?  

Thanks 

  

Jim & Heather Butcher  N241BW 

 

    [quote][b]

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n100rh(at)sbcglobal.net
Guest

Posted: Fri Aug 18, 2006 8:31 am Post subject: Retro Fitting MG Wings

Jim,

I was really hoping you would get a response to your question. I'm 

building the MG and don't have short wings at this time, but have always 

wondered what the retro fit problems would be to add the short wings. 

Hopefully someone will give you some feedback. 

Ralph

Reno, NV

Jim Butcher wrote:

 	  Quote: 	
		  

 We are trying to retrofit glider wings to our XS fuselage. We 

 completed the spar bush installation per Chapter 8 with no problem. 

 Moving to Chapter 27a, we are able to fit the port wing to the 

 fuselage and insert the EUR047 bolts. The top skin of the port wing 

 forward of the spar does just touch the fuselage. However, we are 

 unable to fit the stbd wing. It seems as though the wing will not go 

 far enough into the fuselage, by about ¼ inch. The top skin of the 

 stbd wing forward of the spar is hitting the side of the fuselage and 

 preventing the wing from sliding in as far as necessary. We also 

 notice that the gap between the GDG01 jigs and the lift drag pin 

 sockets (W26 & W27) on the stbd wing is large - over ½ inch while it 

 is small on the port wing - 1/8 inch. Is this a common problem and is 

 the solution to trim the top skin?



 We have also noticed that the flap cross tube FL15 hits the top skin 

 of the wing on both sides. Is the solution to trim the top skin to clear?



 When fitting the short wings to the fuselage, we stretched a string 

 from wing tip to wing tip to check for sweep (Chapter 27-4). The MG 

 manual does not include this step. It only requires measurement of the 

 wings from the tailplane torque tube (Chapter 27a-2). Should we also 

 check sweep with a string as before?



 Finally, the thickness of the spar bushings seems to be greater on the 

 MG wings. Is a different length spar pip pin required?



 Thanks



  



 Jim & Heather Butcher  N241BW



  



 *

 *

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Gary.Leinberger(at)miller
Guest

Posted: Fri Aug 18, 2006 10:00 am Post subject: Retro Fitting MG Wings

I am building a mg and am not as far along - and I just got some short wings - my understanding is that the wings have to be trimmed to fit - you need to cut off some of the material on the wing skin in order to allow the spar to fit in and bolt up. I am thinking about fitting the short wings first, and then the mg wings - since the short wings are already drilled for the bolts and hopefully in the right place.



Glad to hear someone is out there on point.

Gary Leinberger

A237 

Lancaster, Pa.

gleinberger(at)millersville.edu



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europa(at)triton.net
Guest

Posted: Sat Aug 19, 2006 4:21 am Post subject: Retro Fitting MG Wings

To update this thread, we talked to Bob Berube who confirmed that the top

skin needs to be trimmed.  He suggested 1/2 inch gap to the fuselage.



We still have a pretty large gap between the jigs and lift drag pin, 30 mm

at the stbd aft.  But there is plenty of length on the pin, so we bonded in

three plates at the aft position on each wing.  The forward pins only

required one or two plates.



The top skin will need to be trimmed to clear the flap cross tube, but the

fairings will cover that.



We didn't do the string but the measurements should ensure sweep.



Yes, the spar bushings definitely make the spar thicker.  We'll have to

modify the spar cup that is attached to the stbd side of the cockpit module

as well as the one that goes on the port MG wing.  We think the pip pin is

probably long enough, but will require a different number of washers than

fitted for the short wings.



Jim & Heather Butcher N241BW

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grahamsingleton(at)btinte
Guest

Posted: Sun Aug 20, 2006 3:23 pm Post subject: Retro Fitting MG Wings

Ralph Hallett wrote:



 	  Quote: 	
		   



 Jim,

 I was really hoping you would get a response to your question. I'm 

 building the MG and don't have short wings at this time, but have 

 always wondered what the retro fit problems would be to add the short 

 wings. Hopefully someone will give you some feedback. Ralph

 Reno, NV


	


Ralph

I think the factory missed a wonderful oportunity here. I would have 

designed the wing with bolt on tip extensions for gliding and semi short 

wings for cruising. Lots of gliders have this option. The original wings 

are not quite long enough for ideal cruise and climb performance, but 

then Ivan is still obsessed with scarumbatics. (he's scared me more than 

once > ) I prefer the more graceful aerobatics you have with long 

wings not the brute force and ignorance of stubby wing aeroplanes,



Just my prejudice 

Graham

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paul.mcallister

Joined: 09 Jan 2006
Posts: 177
Location: Waukesha, WI USA

Posted: Sun Aug 20, 2006 6:20 pm Post subject: Retro Fitting MG Wings

Graham,



I thought you might be interested in looking at some "quick and dirty"

measurements I took.  I looks like the wing is optimized for 120 knots.  I

still haven't figured out the best speed to fly for maximum range.



Paul



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