wing tip shape (now surface hinging)

[Keith Black]

Matt, my reply wasn't intended for you, it was for Ted's benefit. You're answer stated that to top hinge would be OK if he had the horn located correctly to produce symmetrical throw top and bottom. For me this left the impression that it might be *necessary* to find the exact symmetrical location. My "color commentary" comment was simply bring up the point for Ted that it's not necessary to find the *exact* point because he can always adjust the end points using his radio. It wasn't my intention to suggest that either you or Ted didn't know how to do this. 

BTW, I agree that it's better to have a sound mechanical setup. You don't want to have your servo moving only 50% of it's entire range or 110% in one direction and only 55% in the other.  However, I don't understand the hang-up some people have about not wanting to use the throw adjustment our radios provide beyond a "few percent" (by the way, what is a few percent).  What's the big deal? Do you really think you can tell the difference if a 15% up and down deflection on your ailerons requires the servo to travel 110% up and only 85% down? You move the stick and the ailerons move the exact point you want within fractions of a millimeter. With the resolution we have I just don't understand how this makes any difference, *especially* when it comes to the elevator. It's common place to have different up/down deflections on the elevator anyways. As long as it's not a gross error that would noticeably effect the resolution or torque of the servo, what's the big deal if the adjustments are done mechanically vs. electronically?

If there are really good reasons I'm definitely open to learning these. :-)

Keith Black


  ----- Original Message ----- 
  From: Rcmaster199 at aol.com 
  To: discussion at nsrca.org 
  Sent: Friday, November 26, 2004 12:28 PM
  Subject: Re: wing tip shape (now surface hinging)


  NO!!! REALLY???? GEEZ I DIDN'T KNOW THAT (jus' kiddin' Keith, and pokin' a little fun)

  With the kind of geewhiz programmability available nowadays, too many of us have become a little complacent and use the electronic fixes as cure alls. I am old school and prefer to make the mechanical set-up as sound as possible first, then use the radio to trim the mechanical set-up if needed. If it needs more than a few percent electronic fixing, I usually re-do the mechanical set-up in my pattern models. I do not subscribe to electronic fixes for everything! (Sport planes are another matter)

  Having to electronically fix knife edge flight for example, just frosts me, particularly when a kit costs over $1000 in some cases. 

  MattK

  In a message dated 11/26/2004 1:11:15 PM Eastern Standard Time, tkeithb at comcast.net writes:
    Assuming the use of a computer radio, it's easy to program the throws in the radio to make sure they're symmetrical.

    Keith Black
      ----- Original Message ----- 
      From: Rcmaster199 at aol.com 
      To: discussion at nsrca.org 
      Sent: Friday, November 26, 2004 9:44 AM
      Subject: Re: wing tip shape (now surface hinging)


      Ted, in my experience it makes no difference as long as the horn is located correctly to produce symmetrical throw top and bottom. More difficult to do that with a top hinged surface than a center hinged surface, so be aware of this pitfall. Yet, the top hinged surface is much easier to seal than a center hinged surface, so there are always compromises in everything we do. 

      Personally, I always center hinge my surfaces. 

      MattK


      In a message dated 11/26/2004 10:35:41 AM Eastern Standard Time, tedsander at comcast.net writes:
        About to head into the shop to start hacking ailerons out of my wing cores.  For appearance sake, I had planned to top hinge them.  I take it from the discussion,  that the way the surface is hinged has no noticeable effect in flight – provided the gap is sealed? Correct?



        Ted Sander

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