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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25204
Location: Livermore CA USA
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 Posted: Tue Aug 05, 2008 11:59 am Post subject: BooHoo - Trim Tab Alignment... |
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Listers,
Well, the trim tab came out perfect and I'm really pleased with the
mating to the Elevator. That being said, I'm less than pleased with
the for/aft alignment of the Trim Tab. The Trim Tab hangs past the
Elevator trailing edge by about 1/8" of an inch. It is 1/8" along
the whole distance of the Trim Tab. In looking at the cause, it
appears that the skins are all cut such that you are suppose to use
the roundy part of the hinge and not the square cutout when aligning
the hinge for drilling. This would account for 1/16" on each side
and would add up to the 1/8" overhang I'm seeing. Grrrrrr....
What should I do, fellow builders? I could drill out all the rivets
and use a new hinge, and I'm certainly not opposed to that. But am I
making too big a deal out of the whole thing? Or is everyone gonna
look at it forever and go, "Hey, how come your trim take is too long?" 
Bummed Out in Livermore
Matt
RV-8 #82880
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Matt Dralle
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n747jg(at)earthlink.net
Guest
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| Posted: Tue Aug 05, 2008 12:38 pm Post subject: BooHoo - Trim Tab Alignment... |
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Matt, my plans are at the hangar, so I can't check for sure, but my
guess is that your problem is with the gap / overlap of the hinge
itself, too much hinge is exposed. Take a look at this picture, and
you can probably see what I mean. Drill it out, get new hinge, line
the trailing edge of the elevator and trim tab up using a straight
edge, and drill it again.
Jim Gray
RV-8 N747JG Flying
,
On Aug 5, 2008, at 1:55 PM, Matt Dralle wrote:
| Quote: |
Listers,
Well, the trim tab came out perfect and I'm really pleased with the
mating to the Elevator. That being said, I'm less than pleased with
the for/aft alignment of the Trim Tab. The Trim Tab hangs past the
Elevator trailing edge by about 1/8" of an inch. It is 1/8" along
the whole distance of the Trim Tab. In looking at the cause, it
appears that the skins are all cut such that you are suppose to use
the roundy part of the hinge and not the square cutout when aligning
the hinge for drilling. This would account for 1/16" on each side
and would add up to the 1/8" overhang I'm seeing. Grrrrrr....
What should I do, fellow builders? I could drill out all the rivets
and use a new hinge, and I'm certainly not opposed to that. But am
I making too big a deal out of the whole thing? Or is everyone
gonna look at it forever and go, "Hey, how come your trim take is
too long?"
Bummed Out in Livermore
Matt
RV-8 #82880 <2008.08.02 - RV-8 Tail Kit - Trim Tab
(10).jpg><2008.08.02 - RV-8 Tail Kit - Trim Tab (11).jpg><2008.08.02
- RV-8 Tail Kit - Trim Tab (12).jpg>
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N8RV(at)gte.net
Guest
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| Posted: Tue Aug 05, 2008 1:10 pm Post subject: BooHoo - Trim Tab Alignment... |
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Matt, I can assure you that, unless you're out to build a Grand Champion
winner at Oshkosh (not that there's anything wrong with that), don't sweat
it. The only people who will ever care will be YOU and those who have also
just started an empennage kit!
That said, this is only the beginning. You'll be screwing up pieces and
parts for a long time, so you might as well just order a new trim tab and
see if you can build it to match to your satisfaction. Like many builders,
I have a whole box of junk parts that I sweated blood over. You will, too.
No big deal.
If you know what you did wrong and want to correct it, now's the time to do
it. Order the parts, move on to something else and backtrack when the stuff
shows up.
Welcome to the club!
Don McNamara
N8RV
80113
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Terry Watson
Joined: 09 Jan 2006
Posts: 290
Location: Seattle, WA USA
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| Posted: Tue Aug 05, 2008 2:00 pm Post subject: BooHoo - Trim Tab Alignment... |
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Matt,
Don's right, of course, but now that we all know what to look for we will
all be pointing at it and whispering about it. Maybe you could paint it red
and we wouldn't notice that it didn't line up.
I could probably line that sucker up with a big rubber mallet.
Terry
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japhillipsga(at)aol.com
Guest
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| Posted: Thu Aug 07, 2008 7:08 am Post subject: BooHoo - Trim Tab Alignment... |
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Matt, that is nothing. Just wait until you rivet the wing bottom skins. Talk about a painful time. Best regards and keep on working, Bill
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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25204
Location: Livermore CA USA
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| Posted: Sat Aug 09, 2008 5:09 pm Post subject: BooHoo - Trim Tab Alignment... |
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Dear Listers,
Thanks to everyone for all the great feedback on my trim tab
woes. The more I looked at the 1/8" over hang of the trim tab, the
more I couldn't stand it! So I ordered up a new hinge which came
today. Drilling out the rivets wasn't too bad. I used a nice
straight piece of wood taped to the trailing edge of the Elevator as
a reference, and then redrilled the new hinge. Attached is a
"before" and "after" shot. Ah, much better! Now I can sleep at
night. All and all it was pretty easy.
BTW, I picked up a small "air brush" by Badger this afternoon at a
local craft store call Richards. It has a little glass bulb to hold
the paint and with an adapter, hooked right up to my air
compressor. Three drinking straws full of Variprime plus three
straws full of activator was all I needed in the little air brush to
very nicely prime the two pieces of replacement hinge. Clean up was
easy and fast. Great for those "one-off" priming jobs. Just a
little tip from your Uncle Matt... 
So, just to set the record straight, none of you guys will now be
able to come up to me and point and laugh when you see my trim tab alignment!!
Best,
Matt Dralle
RV-8 #82880
At 12:55 PM 8/5/2008, Matt Dralle wrote:
| Quote: | Listers,
Well, the trim tab came out perfect and I'm really pleased with the
mating to the Elevator. That being said, I'm less than pleased with
the for/aft alignment of the Trim Tab. The Trim Tab hangs past the
Elevator trailing edge by about 1/8" of an inch. It is 1/8" along
the whole distance of the Trim Tab. In looking at the cause, it
appears that the skins are all cut such that you are suppose to use
the roundy part of the hinge and not the square cutout when aligning
the hinge for drilling. This would account for 1/16" on each side
and would add up to the 1/8" overhang I'm seeing. Grrrrrr....
What should I do, fellow builders? I could drill out all the rivets
and use a new hinge, and I'm certainly not opposed to that. But am
I making too big a deal out of the whole thing? Or is everyone
gonna look at it forever and go, "Hey, how come your trim take is
too long?"
Bummed Out in Livermore
Matt
RV-8 #82880
|
Matt G Dralle | Matronics | PO Box 347 | Livermore | CA | 94551
925-606-1001 V | 925-606-6281 F | dralle(at)matronics.com Email
http://www.matronics.com/ WWW | Featuring Products For Aircraft
| | - The Matronics RV8-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV8-List |
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Matt Dralle
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