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Author Topic: Elev. Control Horn  (Read 801 times)

Offline FLOYD CARTER

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Elev. Control Horn
« on: March 03, 2011, 10:03:14 PM »
I've hit this same problem on many planes in the past.  The hookup from the elevator pushrod to the elevator horn happens in a normally restricted space, between the fuselage sides.  Bending  1/16" music wire into an "L" takes up too much space, and clearance is gained by hacking away some of the fuselage sides!

I've used those spring-loaded connectors, called "kwik-links", threaded 4/40, but I'm afraid they are not strong enough.

Ball links are out of the question, because they are BIG.

If you have a better idea, can you describe it so I can understand?

Thanks,

Floyd
90 years, but still going (mostly)
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Offline Russell Shaffer

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Re: Elev. Control Horn
« Reply #1 on: March 04, 2011, 08:06:42 AM »
DuBro makes a heavy duty nylon clevis with a sliding lock on the pin.  I think it will be fine till the pin wears through.
Russell Shaffer
Klamath Falls, Oregon
Just North of the California border

Offline FLOYD CARTER

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Re: Elev. Control Horn
« Reply #2 on: March 04, 2011, 12:32:00 PM »
But I'm talking big stuff here!  62" span with RO-Jett 76.  Looking for a really strong clevis that will fit.'

'Floyd
90 years, but still going (mostly)
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Offline Gene O'Keefe

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Re: Elev. Control Horn
« Reply #3 on: March 04, 2011, 12:41:24 PM »
Golly Floyd, I gotta wonder..a 62" span and ball links are to big ?   How much of a taper is there at the tail that you couldn't use ball links ? I'd widen (sp?) the fuse under the stab to use ball joints (cause IMHO they are the best).

  Geno
Gene O'Keefe
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Offline Mark Scarborough

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Re: Elev. Control Horn
« Reply #4 on: March 04, 2011, 12:46:49 PM »
Its a pretty common problem on classic ships especially. I have found that UHP (?) makes a machined clevis that is very solid, though not especially skinny.
Personally I use a self fabricated attechment that just has a bushed hole in an aluminum pinch block that slides on the horn for adjustment ( flap to elevator ratio adjustment) Pat Johnston showed me this. I think his mustang article in Model Aviation had pictures of it
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Offline john e. holliday

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Re: Elev. Control Horn
« Reply #5 on: March 05, 2011, 07:25:36 AM »
Balsa peices cured the lack of space for my King Sweep.   I am no ashamed to cut holes in the fuselage sides to get clearance at the elevator horn.  H^^
John E. "DOC" Holliday
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Offline Bill Little

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Re: Elev. Control Horn
« Reply #6 on: March 06, 2011, 11:06:04 PM »
Balsa peices cured the lack of space for my King Sweep.   I am no ashamed to cut holes in the fuselage sides to get clearance at the elevator horn.  H^^

Hi Doc,

Several of my "Classic" planes have "scab" under the stab to cover a hole for the elevator horn.  A side benefit is that it adds a bit more wood to support the stab.

Big Bear
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Offline Tom Niebuhr

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Re: Elev. Control Horn
« Reply #7 on: March 07, 2011, 02:57:00 PM »
I have cut a hole in the fuselage sides to get a little clearance, then covered the hole with silk span. This is invisble.

Mark,
Do you have pictures of the "pinch block"?
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