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Building Tips and technical articles. => Building techniques => Topic started by: Paul Smith on December 13, 2006, 07:36:34 PM
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Are there any otehrb sources for the pork chop-shapoed control horn, like the Brodak Differential Control Horn, part # BH-755?
It's shown on the Ares plan. The idea is to get the flap horn foreward and the elevator output hole on the centerline, to get closer to true-equal throws.
It would be nice if there was more than just one size to chose from.
What wouod really be nice would the be design shown on some of the Russian designs and Bill Netzeband's article. The one where the input and output holes are both the same elevtion from the pivot and the input hole is about 10 degrees forward of the output.
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Try Control line specialties. There's a link on this forums startup page. There are no illustrations, but the descriptions are OK.
You could use the illustration on the Ares plans and make your own also. I do this often to make sure that the bellcrank to flap link is as accurate as possible.
It's worth the effort.
John miller
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Welding & brazing is a skill (and tooling) that I never acquired. Maybe I should. But considering the number of big stunters I expect to build, the "make or buy decision" tips toward the BUY side.
I'll check the CL Specialties site. I wish they'd offer pictures, my imagiantion isn't all that reliable.
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Welding & brazing is a skill (and tooling) that I never acquired. Maybe I should. But considering the number of big stunters I expect to build, the "make or buy decision" tips toward the BUY side.
I'll check the CL Specialties site. I wish they'd offer pictures, my imagiantion isn't all that reliable.
Hi Paul,
You can contact Tom Morris directly. I don't have is contact info here, at work, but someone here does, I am sure. A phone call is great if you can catch him! y1
He can make different sizes.
For "big" .61 Piped ships I like the double flap horn where the ball link goes between the two uprights. They are available in "tweakable" 3/32nd" or 1/8th" wire.
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I found the site OK, problem is, but I still can't visualize what:
Product ID: BLF-02D
Double Ball Link Flap Horn
1/8 x 1 1/4 x 3/4 Double
....means ??
Amusing, I can take & post pictures, but not weld control horns.....
He can make control horns, but not fo-grap 'em (Rambo accent).
I guess I could just buy one of each sort it out later.
In the interim, I picked up a Brodak horn at my corner 711.
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You call it a pork chop horn, I call it a dog leg. The one described is a dual horn in which the 4-40 ball clevises go between the verticle arms. The 3/4 hole is for the elevator pushrod. the 1 1/4 hole is flap to bellcrank. That is what is being installed in my P-39. Also it is Control Line Central by Jim Snelson that is taking over Tom's merchandise. Later, DOC Holliday
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Yes, Doc, and I have also called it a "cobra style" horn...
The idea of these is that, at neutral, the pushrod from the bellcrank comes to the flap horn at right angles at neutral, and the pushrod to the elevator leaves the flap horn at right angles, at neutral.
From several studies I've played with over the past few years, this gives the LEAST variance from "proportional" response to upright or inverted control inputs.
Keep in mnd that RCers use strange angle servo and horn hookups on the aileron output servo wheels to get differential aileron. W/o that, they find outrageous adverse yaw problems - just the things we DON'T want to have to try to trim out over dozens of flights...
I wish y'all the Happiest Christmas, and Merriest of New Year's 2007!