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Building Tips and technical articles. => Building techniques => Topic started by: Rob Killick on July 10, 2008, 08:50:06 PM

Title: Flap horn inst. for I-beamers ?
Post by: Rob Killick on July 10, 2008, 08:50:06 PM

Hi ,

Being a noob at building I-beam ships , I was wondering how the flap horn is installed to the wing T.E. , without major surgery ?
I use the cut out method on rib and spar type wings , but looking at the way I-beam wings are constructed , the process escapes me  ::)

Thanks in advance ,

Rob K.

Title: Re: Flap horn inst. for I-beamers ?
Post by: Ralph Wenzel (d) on July 10, 2008, 08:55:08 PM

The most common, and simplest, method is to place the flap horn (with bushings) in the fuselage and then slip the TE into place. Then bind the Flap horn to the TE using cloth and glue, or narrow Fiberglas tape with polyester resin.

Title: Re: Flap horn inst. for I-beamers ?
Post by: Randy Powell on July 10, 2008, 10:12:43 PM

I sometimes wish I didn't live out in the boonies (and believe me, there are some boonies around here) so that I could teach people live and in person about stuff like this. For some of us that have build a lot of planes, it seems obvious, but for those just learning, it can be much less so.

Ty has the right of it.

Title: Re: Flap horn inst. for I-beamers ?
Post by: L0U CRANE on July 10, 2008, 11:09:31 PM

...only thing I'd add is that you might consider a "center brace" between the fuselage sides, on the forward edge of the TE strip. 1/16 ply the height of the TE strip, or another pices of, usually what, 1/2 sq?, to brace up where you need to notch for horn motion...

And, likewise, if using Klett-type pin-hinges, a strip of 1/8" balsa forward of the TE, where the hinges go, adds gluing area. These don't need to reach the covering surface, so they can be invisible after finishing.

Title: Re: Flap horn inst. for I-beamers ?
Post by: Rob Killick on July 11, 2008, 04:06:17 PM

Gentlemen ...

Thanks for all the input .
I have a mental picture of what you all said , but with one question concerning Ty's post .
With the trailing edge "squared or parallel to the flap horn (on a tapered ARES wing) , will the "flattened portion of the trailing edge exit the fuselage sides and end at the 90 degree bend of the flap horn (where it enters the flap) ? I'm sure "Lucky boxes" are a necessity for this type of flap ?
A comment concerning Randy's post ...
I am the epitome of "Boonies" !!
I'm the only active control line flier within a radius of 700 miles   :( and the learning curve has many a bump in it , but with help from guys like you I hope to become a proficient modeller and flier .
The online chat forum , here , makes things alot easier , too :)

Thanks again fellows ,

Rob K.

Title: Re: Flap horn inst. for I-beamers ?
Post by: Bill Little on July 18, 2008, 08:49:23 PM

Hi Rob,

If I understood you question of the *square portion of the TE*, it doesn't extend beyond the fuselage sides.   The TE gets shaped starting at the fuse sides.

Also, I have never used lucky boxes, and never had a problem with the horns springing.

Mongo