No fixed tips?

[Lance Van Nostrand]

Don't know if its directly related,but I built a removablestab with elevator counter balances at the tips on a pattern plane.  Flew terrible at low speed.  replaced it with a regular stab and fixed tips and it flew great.  The elv is a very important surface and I would do everything to reduce unwanted turbulence.
--Lance

  ----- Original Message ----- 
  From: Bob Pastorello 
  To: discussion at nsrca.org 
  Sent: Saturday, January 29, 2005 8:34 PM
  Subject: Re: No fixed tips?


  I have to agree about the "boxed in" setups being somewhat smoother, and having less wear and tear on the servos.
      And ARF-ers'  *are* doing it... both the Arresti I flew, and this Icepoint have tips on ALL control surfaces.  And I don't think they would do that if there wasn't at least a "belief" that they were needed.

  Doubt that there's good scientific data about this on our models...but sure a lot of anecdotal evidence to support having tips installed!

  Bob Pastorello
  NSRCA 199  AMA 46373
  rcaerobob at cox.net
  www.rcaerobats.net


    ----- Original Message ----- 
    From: Troy A. Newman 
    To: discussion at nsrca.org 
    Sent: Saturday, January 29, 2005 8:26 PM
    Subject: Re: No fixed tips?


    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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