Elev. Pull pull Question

[Wayne Galligan]

And if you can find the threaded aluminum spacers(about 1/4 round) they make great stand offs and lock the bolt to the hard point with out having to glue them in. Also makes the control rod stiffer with nary any weight gain.  They make them in several lengths, 1/2, 3/4 and 1"  long.

Wayne G.

  ----- Original Message ----- 
  From: ronlock at comcast.net 
  To: discussion at nsrca.org ; discussion at nsrca.org 
  Cc: Karl G. Mueller 
  Sent: Tuesday, November 30, 2004 10:35 AM
  Subject: Re: Elev. Pull pull Question


  Another option- buy 6-32 all thread at local hardware store.
  Cut stud lengths as needed and thread into hard points with a bit of epoxy.
  Ive been using them for years for elevator, aileron, & rudder.

  Ron Lockhart
    -------------- Original message -------------- 

    Matt,

    I have used # 6-32 socket cap screws for years now and never had a failure
    with these. Buy a box of 100 about 2" long at your local industrial supply
    for about $20-25, cut of the heads, put a couple of grooves in the non threaded
    part for the epoxy to hold and glue these into the hard point (1/2" dia dowel) in 
    your movable surface. Do no drill all the way through. Just up to the top sheeting.
    You can offset the hole in the hard point toward the hinge
    line to adjust for proper distance for the hole in the plastic end, that receives the
    clevis, to line up over the hinge line. Socket cap screw are heat treated, but not 
    all the way. They still have a soft core and will bend under enough force, but
    not with the amount of force used to move the surfaces.

    Karl G. Mueller
    kgamueller at rogers.com


      ----- Original Message ----- 
      From: Rcmaster199 at aol.com 
      To: discussion at nsrca.org 
      Sent: Tuesday, November 30, 2004 9:28 AM
      Subject: Re: Elev. Pull pull Question


      Keith, please note that 4-40's are known to snap off a control surface. It has happened to me. The break is a straight forward fatigue fracture. If 6-32's are not useful to you, consider 5-40's. Personally, I do find 6-32s do just fine in this application

      MattK

      In a message dated 11/30/2004 3:17:03 AM Eastern Standard Time, tkeithb at comcast.net writes:
        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

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