Elev. Pull pull Question

[Wayne Galligan]

Since we are using nylon clevis that will self thread why not use a fine thread # 6 rod or bolt( or metric equivalent ) for the control horn if you want more precision.

Wayne G.

  ----- Original Message ----- 
  From: Keith Black 
  To: discussion at nsrca.org 
  Sent: Tuesday, November 30, 2004 2:16 AM
  Subject: Re: Elev. Pull pull Question


  I've used these control arms too and personally I think they're great. I understand what Lance is talking about regarding the "look", but after studying it carefully I realized that it only looks funny because the arm sticks out so far and is fairly close to the surface. Mechanically it's no different that if you had a post sticking straight up from the hinge. I believe if they were mounted a bit further from the surface (in other words on a longer post) they wouldn't look funny. As to the stress angles, Lance has a point that there will be more stress at the location the black plastic hooks onto the threaded post, but I feel they will easily hold up to this stress and it's not a concern. 

  Hey, who really cares if it plays tricks on your eyes as long as it works!  Personally I don't spend much time staring at the control horns anyway. ;-)

  Cat's Meow? Maybe not, but darn close. The only thing that keeps them from being the Cat's Meow in my book is the 6/32 threads which don't offer as precision of adjustments as 4/40 or the MK horns. 

  Lance's suggestion of offsetting the control arm at the servo is perfectly valid also.

  Keith Black
    ----- Original Message ----- 
    From: Lance Van Nostrand 
    To: discussion at nsrca.org 
    Sent: Monday, November 29, 2004 11:15 PM
    Subject: Re: Elev. Pull pull Question


    Eddie,
    Welcome to D6.  You already were a D36'er but now your assimilation is complete.

    I could have saved you the agony.  Tried to do the same thing about 6 months ago with the same outcome.  I wanted them to screw to my own 6-32 threaded rods so I could set the rod 3/4" behind the hinge line.  Paid the big bucks for the set and used the long arms anyways.  HOWEVER, it didn't work out.  The long 3/4" reach of these "overhang" pieces looked fine with my rudder at neutral, but when the surface deflected they formed a weird angle with the pull-pull cable and almost hit the fuse.  I didn't like the look.  I no longer think these are the cats meow. The fix was to use the small white nylon old-style pieces but offset the control arm at the servo end.  Looks better and no weird stress angles on the cables.
    --Lance
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