CONTROL HORNS

[Bob Pastorello]

Masking tape on the back side of the tubing drill prevents the tear-out.

Bob Pastorello, Oklahoma
NSRCA 199, AMA 46373
rcaerobob at cox.net
www.rcaerobats.net


----- Original Message ----- 
From: "Wayne Galligan" <wgalligan at goodsonacura.com>
To: <discussion at nsrca.org>
Sent: Wednesday, September 03, 2003 3:44 PM
Subject: Re: CONTROL HORNS


> One thing to remember when using this method is to make sure the 1/2"
brass
> tubing cutting edge is sharp. Otherwise it will tear out on the bottom or
> you will have to use excessive pressure to cut and this can cause a
> misalignment to occur.  BTDT
>
> Wayne G.
>
> ----- Original Message ----- 
> From: "Woodward James R Civ 412 TW/DRP/ACQ"
<James.Woodward2 at edwards.af.mil>
> To: <discussion at nsrca.org>
> Sent: Wednesday, September 03, 2003 2:48 PM
> Subject: RE: CONTROL HORNS
>
>
> > Nice one Wayne.
> >
> > A simple way to drill the holes for the dowel is to tape your aileron
onto
> > the foam core in its original position.  Then, use a drill press to go
> > straight up and down.  I've done this a few times and it is easy.  It it
> > much easier in practice, than in discussion.  You can also try it on a
> trial
> > piece too.
> > Jim
> >
> >
> > Subject: CONTROL HORNS
> >
> > Keith......
> >
> > Don't make such a fuss about this control horn thing.  Go down to Ace
> > Hardware and get the longest 6-32 bolts you can, about 3-4 inch are
> > available.  Then in the small hardware section get threaded aluminum
> sleeves
> > for 6-32.  These come in 1/2 and 3/4 inch lengths.  These make perfect
> > standoffs for the control arms, strengthening the rod and an ideal way
to
> > lock the rod to the hard point.(this was Lances idea BTW).   I have had
no
> > problem getting these things to line up with the hinge line.  When
> drilling
> > your hard surface for the hardpoint and for the rod.  Put the control
> > surface temporally on with the hinges in place and place in the shuck
> half.
> > Using your drill press take a 1/2 brass tube(tube edge sharpened on
> sanding
> > disk) and drill out the surface for the hard dowel.  Do the same for
when
> > drilling the hole for 6-32 rod.  Tap through and then drip thin c/a in
the
> > hole, let cure and retap again to harden the threads.
> > As Bob P. stated... this system will function just fine. And you wont
have
> > to worry about ordering parts from a foreign country.  Ideally if you
can
> > find some #6 fine threaded bolts it would give you finer adjustment but
I
> > don't think it would be necessary.   I have used the nylon 2-56 clevis
on
> > the elevator pull/pull on my Prophecy that had over 450 flights on it
> before
> > it went in and there was little to no wear in the control horn (as per
Bob
> > P.'s recommendation).   I used kevlar cable and it was in good shape
also.
> > Very light and strong setup.
> >
> > Wayne G.
> >
> >
> > ----- Original Message ----- 
> > From: "Keith Black" <tkeithb at comcast.net>
> > To: <discussion at nsrca.org>
> > Sent: Wednesday, September 03, 2003 11:33 AM
> > Subject: Re: Control horns, is it just me or... ?
> >
> >
> > > That looks quite interesting. I do have a couple of concerns however.
> > >
> > > Given that the mounting plate (foot) is perpendicular to the arm when
> the
> > > arm is mounted on a control surface with an air foil shape the arm
will
> > > actually be pointing backwards away from the hinge line. To avoid this
> one
> >
> >
> >
> > > would either need to prop up the back side of the mounting plate or
> recess
> > > the front of the plate down into the control surface. With this
> particular
> > > design it seems that you'd have to cut pretty deeply into the control
> > > surface on the leading edge to get the arm to be perpendicular to the
> > hinge
> > > line.
> > >
> > > Second concern is that the arm is not located on the edge of the
> mounting
> > > plate, which means that it would be moved back a bit from the bevel
thus
> > > offsetting the advantage of the longer arm.
> > >
> > > I promise I'm not trying to be difficult ;-)
> > >
> > > Keith
> >
> >
> > =====================================
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> >
> >
>
>
> =====================================
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>

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