Question on wing tube lengths

[Lance Van Nostrand]

Wow! that's really short.  I guess you must be using some kind of spar arrangement to spread the load at the end of the tube?  I am stuck with the 3/4" wide carbon fiber cloth spars on top and bottom in front of and behind the wing tube because this experimental wing has already been sheeted.  I could start from scratch but that would make this experiment too time consuming and its already interrupting the building of my Symphony.

I've now gotten recommendations at both ends of the spectrum so I've decided to compromise and trim a bit from both ends.  This leaves the tube at 9" into each wing, which still seems pretty safe.  Especially considering Mike that only uses 6".  

Man, if 6" is all you need, then we could all be saving some weight here.

--Lance

  ----- Original Message ----- 
  From: Mike 
  To: discussion at nsrca.org 
  Sent: Monday, June 21, 2004 2:29 PM
  Subject: Re: Question on wing tube lengths


  Hi,
  Theoretically you need 3 times the diameter to transfer the moment. I go 6D into the wing (about 15 cm) and never had any problems
  Mike
    ----- Original Message ----- 
    From: Todd Schmidt 
    To: discussion at nsrca.org 
    Sent: Monday, June 21, 2004 8:05 PM
    Subject: Re: Question on wing tube lengths


    Lance, I usually go 12" but have seen many shorter. 
    Todd
      ----- Original Message ----- 
      From: Lance Van Nostrand 
      To: discussion at nsrca.org 
      Sent: Sunday, June 20, 2004 11:18 PM
      Subject: Question on wing tube lengths


      Here's a question for anyone that's built a few planes from different manufacturers.  How much wing tube is the optimum to have sticking into each wing?  
         We cut our wings for 9.75" of tube in each wing but that's only because that's the length so that the false rib can support the gear plate.  What if the tube only went into the wing 8"....is that enough to stabilize it?

      I'm thinking of another (of my many) experiments by clipping the wings of an Aries by removing the root.  The wings I have already have a wing tube mounted so I'd be shortening the amount of wing tube that goes into the wing.

      Thanks,
      --Lance
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