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Re: Europa-List: First flight LN-SKJ

Subject: Re: Europa-List: First flight LN-SKJ
From: Sidsel & Svein Johnsen <sidsel.svein@oslo.online.no>
Date: Wed, 13 Sep 2006 21:00:29
Bob,

Interesting thought, but the wash-out is not the cause in my case.

I am not familiar with the term "accellerated factory built wings".  The 
kit I bought from the factory 5 years ago came with the wing ribs in 
place (but not reinforced to the beam and bottom panel), bottom panel, 
leading edge and top panel (actually, the seam between bottom and top 
panel is at the l.e.).  Apart from bid reinforcements, aileron weight 
boxes, meachanics, etc, the only major thing was to glue on the top 
panel.  For this weights (sand bags) were used, and if one did not 
support the underside of the wing in the process, one could conceivably 
introduce a twist, i.e. change the washout. 

On my wings I checked the washout and it was fine.  I did not check it 
in absolute terms because I did not have a proper template for the tip 
section, but I checked that the tip on both wings had the same 
difference in angle between root and tip  when placing the flap 
installation template on the two positions.  Also, I checked the aileron 
and flap washout (factory built, termed "accellerated kit") and they had 
exactly the same and correct washout as per the manual.  Finally, I 
rechecked the washout on my wings this afternoon, and even with a very 
accurate bubble level I could not see any difference.  

So maybe the incidence angle of the whole left wing on my plane is the 
cause of this wing being "heavy" in my case?  No, the left wing is 
actually a small fraction more up at the root than the right one 
(whether this is the cause of the left wing drop in stall I cannot say 
for sure, but theoretically it should stall just a little before the 
right one).

Best regards
Svein
LN-SKJ
  ----- Original Message ----- 
  From: R.C.Harrison 
  To: europa-list@matronics.com 
  Sent: Tuesday, September 12, 2006 9:11 PM
  Subject: RE: Europa-List: First flight LN-SKJ


  Hi! Svein,

  Congratulations on your achievement.

  Just this afternoon I was with Roger Cullum who built the original 
G-OGAN polystyrene wings . He is currently assisting the build of 
another Europa XS and we believe that the wings are from an 
"accelerated" build kit, he was checking out the washout of both wings 
whilst he still hasn't closed them out with the last bottom skin.

  We are given to understand that on the accelerated kit the leading 
edge and upper surfaces are allowed to cure in a mould. ( we expect two 
moulds one for each wing)

  On checking the underside of each of the  wings we found that the 
washout on the Starboard  wing is =BD degree under the requisite 2 =BD  
degrees. Compared to the Port wing being correct.  

  I suggested that prop wash may either compensate or indeed aggravate 
the difference but we didn't have time to closely consider the matter.

  Hearing about your "left" wing drop makes me wonder if our "wash out 
differing wings" may be a common issue on all accelerated wings?

  Were you totally confident of identical wing washout on your bird? And 
was it  "ACCELLERATED FACTORY BUILT WINGS.?

  Regards

  Bob Harrison G-PTAG Europa MK1.Kit 337.

  Robt.C.Harrison

   


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