[NSRCA-discussion] Control horns

[Jerry Stebbins]

David, we sold the rod/horn/coupler/clevis set-up you are talking about. Discontinued the 4-40 ones after a few(even hardened steel) ones on the elevator and rudder bent/broke on Pattern planes.Ailerons showed some movement also.. We now have/suggest using 6-32 or even the 6-40 ones that Rocket City used to sell. Much stronger and only a few grams heavier. NO sense shaving something that can destroy you!.
Just our experience, and I am sure there are a lot flying with 4-40s
Jerry
RC Model Enterprises
  ----- Original Message ----- 
  From: David Flynt 
  To: NSRCA Mailing List 
  Sent: Sunday, February 05, 2006 12:48 AM
  Subject: Re: [NSRCA-discussion] Control horns


  I like the 1" MKD Control horns, and if you want ball bearings, the MK clevis, both available from Central Hobbies.  These work really good, and the length is somewhat adjustable.  I really like the anodized aluminum horns that RCME once sold, but you said that you did not want to spend a lot of money.

  If you don't want to spend less than the MKD horns, then long 4-40 bolts with a non-threaded shank will work nicely.  All-thread will fail.  It is important that the part of the bolt that is glued into a hard point dowel is not threaded, and that the threaded portion is minimum length.  Scratch the shank with alum oxide sand paper before epoxying into hard point.  I have never had one of these fail or pull loose from the hard point.  www.microfasteners.com is a good source for long bolts.

  Another option is to make the horns yourself from G-10 material, and glue these into the the control surface.  G-10 is available from www.McMaster.com.  See http://home.online.no/~ofremmi/Drawings/drawings.htm for ideas.

  Hope this helps.

  David  
    -----Original Message-----
    From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of mike mueller
    Sent: Saturday, February 04, 2006 9:56 PM
    To: nsrca-discussion at lists.nsrca.org
    Subject: [NSRCA-discussion] Control horns


     What alternatives are there to the Chip Hyde control horns. The plane I'm building (Genesis) is setup with ply plates that are designed to use these They are a little pricey. Mind you they look well made. Are there horns on the market that are similar?
     Or how about someone out there that has a set of these that they want to sell me. TIA,Mike


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