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Icrashrc(at)aol.com
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 Posted: Thu Mar 02, 2006 3:03 pm Post subject: Aileron and flap hinges |
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I'm building a Mark III Xtra, but with the separate flaps and ailerons like
the Classic. On the plans it clearly shows the hinges interfering with the ribs
on the flaps and ailerons. Funny thing is that's exactly how the wing builds
too! The only options I see are:
1. Notch the hinges around the ribs, leaving enough room for the fabric to
pull back down to the LE from the 'Homer bump.' This would seem to be a large
chunk of hinge missing.
2. Make the individual hinges 7 inches long instead of 14" and lay them
between the ribs like the Firefly is. This would leave just as much hinge as the
plans call for but in 6 pieces instead of 3.
3. Drop the barrel of the hinge down inside the gap far enough to keep the
ribs and hinges from interfering. Doing it like this would not allow the pivot
point on the root rib to line up with the pivot point of the piano hinge. Also
I don't know if it would limit surface travel enough to interfere with folding
the wings.
I'm leaning toward option 2 because of the obvious problems with the other
two options. If anyone wants to share how they worked around this problem please
feel free to do so! Thanks,
Scott
do not archive
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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Richard Pike
Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee
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| Posted: Thu Mar 02, 2006 3:39 pm Post subject: Aileron and flap hinges |
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I would go with option one. That is how I did my MKIII Classic.
If you want a bit of extra beef for the hinges, you can easily add a
bunch of strength by adding an extra (non-piano) hinge out at the tip,
as I did on mine.
http://www.bcchapel.org/pages/0003/pg8.htm
And that hinge must be absorbing some load, after ten years, it is time
to replace the AN-3 bolt in that hinge, it is getting worn!
Richard Pike
MKIII N420P (420ldPoops)
Icrashrc(at)aol.com wrote:
| Quote: |
I'm building a Mark III Xtra, but with the separate flaps and ailerons like
the Classic. On the plans it clearly shows the hinges interfering with the ribs
on the flaps and ailerons. Funny thing is that's exactly how the wing builds
too! The only options I see are:
1. Notch the hinges around the ribs, leaving enough room for the fabric to
pull back down to the LE from the 'Homer bump.' This would seem to be a large
chunk of hinge missing.
|
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_________________
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing. |
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Duncan McBride
Joined: 16 Jan 2006
Posts: 5
Location: Fort Myers, FL
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| Posted: Thu Mar 02, 2006 4:49 pm Post subject: Aileron and flap hinges |
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I used option one, and I followed Richard's suggestion when I built my first
set of Mark IIIc wings. After the hangar doors fell on the wings and
smashed the leading edges and spares, Hurricane Charlie (
http://home.comcast.net/~duncanmcbride/Charley.htm , scroll down to
'after' ) proceeded to slam the plane back into the T-hangar, mashing on
the ailerons to where the linkages were bent and the control surfaces
ruined. The L-hinges were still securely fixed in place, even though the
trailing edge of the wing and the leading edge of the aileron were warped
like pretzels. Wish I had a picture. Whatever, put them on a few inches
from the tip, especially with the counterweights - it really makes a
difference
Duncan McBride
MKIII N319DM, deltamike
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Mk III, 319DM |
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Icrashrc(at)aol.com
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| Posted: Sat Mar 04, 2006 3:52 am Post subject: Aileron and flap hinges |
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John, Richard, and Duncan, thank you!
I was wondering if maybe I had misread the plans somehow. I'm happy to see
that isn't the case.
I seem to remember someone machining some blocks that allowed for easy
placement of the hinges. I can't find the thread now. As I recall whoever made them
was willing to loan them out. I don't remember if they were for a Mark III or
not. Does this ring a bell with anyone?
Scott
do not archive
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