[NSRCA-discussion] Control horns

[David Flynt]

Jerry,

>NO sense shaving something that can destroy you!.

No doubt.  Thanks for sharing your experience.  I would hate to hear about
somebody that used 4-40 bolts on my advice, and it ended up ruining their
plane.

Just curious, has anybody broke the MKD post horns?

David


  -----Original Message-----
  From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Jerry Stebbins
  Sent: Sunday, February 05, 2006 7:54 AM
  To: NSRCA Mailing List
  Subject: Re: [NSRCA-discussion] Control horns


  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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