No fixed tips?

[Grow Pattern]

The current theory is that the ailerons all the way out to the tips, stop the snap more accurately.

Eric.
  ----- Original Message ----- 
  From: Bill Glaze 
  To: discussion at nsrca.org 
  Sent: Sunday, January 30, 2005 11:33 AM
  Subject: Re: No fixed tips?


  Again, with the full-size:  Notice that such luminaries as Boeing, Douglas, et.al don't run their ailerons to the tips, but instead stop short?    As Troy and Doug have stated, the wingtip vortices generated are the reason.  I had a long discussion with Dick Hanson about this, and he stated that "it didn't make any difference on our models."  Well, from what Troy has discovered about aileron pots, it seems it DOES make a difference.
  Bill Glaze

  Troy A. Newman wrote:

    They don't fly the same....and the aileron thru the tip thing wears out servo pots faster. I flew a model this past summer and it went thru aileron servo pots in 50 flights. I normally get well over 100-125 flights. And this was a wood model so the vibration was better damped than a composite fuse.

    Wing tips have lots of turbulence coming off of them...then stick a aileron in this turbulence. NOPE not the best from an engineering standpoint. 

    The answer guys and manufacturers give is it snaps better. My answer is design a good wing and it will snap better. Copy a good wing and it will snap better.  The ailerons become more effective with the area at the tip....but I don't feel it helps flight performance. Aileron thru the tip is much easier and faster to build than a boxed in version. on the ARFy stuff its cheaper...this is the biggest reason I think its done.

    As for elevators without tips there are no references. And the same things apply

    All my models have them boxed and will have them boxed in.

    Troy
      ----- Original Message ----- 
      From: Tim Taylor 
      To: discussion at nsrca.org 
      Sent: Saturday, January 29, 2005 7:46 AM
      Subject: No fixed tips?


      No fixed tips at the end of the wing/stab seems to be the rage. Any real reason for this? I really don't care for this very much as it makes it harder to make sure your trim is right and the elev half's meet.
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