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Building Tips and technical articles. => Building techniques => Topic started by: FLOYD CARTER on March 03, 2011, 10:03:14 PM

Title: Elev. Control Horn
Post by: FLOYD CARTER 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

Title: Re: Elev. Control Horn
Post by: Russell Shaffer 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.

Title: Re: Elev. Control Horn
Post by: FLOYD CARTER 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

Title: Re: Elev. Control Horn
Post by: Gene O'Keefe 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

Title: Re: Elev. Control Horn
Post by: Mark Scarborough 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

Title: Re: Elev. Control Horn
Post by: john e. holliday 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^^

Title: Re: Elev. Control Horn
Post by: Bill Little on March 06, 2011, 11:06:04 PM

Quote from: john e. holliday 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^^

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

Title: Re: Elev. Control Horn
Post by: Tom Niebuhr 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"?