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a.s.elliott(at)cox.net
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 Posted: Thu Jan 25, 2007 8:05 am Post subject: Filling in the rib ends? |
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Gang:
Another question about techniques - What are people doing to fill in the spaces at the aft ends of the end ribs on the various control surfaces? Similar applies to the empty spaces in the inboard ends? I have been variously thinking of wood blocks, plastic plugs, etc. for the ends, and false ribs for the centerline spaces on the rudder and elevator. Other ideas?
Andy Elliott, Mesa, AZ
N601GE (reserved)
601XL/TD/QB, Corvair, building...
[quote][b]
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amyvega2005(at)earthlink.
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| Posted: Thu Jan 25, 2007 10:00 am Post subject: Filling in the rib ends? |
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all, the other option that works just as well, is AMD's design of a trim tab which does not require a cut. The tab runs from inboard edge to entire length of the port elevator. by 3 inches wide. It is secured by the paino hinge, and is frankly a lot easier. I put in the orignal cut in one, then found the AMD option. I would recommend the later.
Juan
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planecrazydld(at)yahoo.co
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| Posted: Thu Jan 25, 2007 1:20 pm Post subject: Filling in the rib ends? |
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.and that is precisely the configuraton in the latest revision of the plans for the 601XL!
Juan Vega <amyvega2005(at)earthlink.net> wrote: [quote]--> Zenith-List message posted by: Juan Vega
all, the other option that works just as well, is AMD's design of a trim tab which does not require a cut. The tab runs from inboard edge to entire length of the port elevator. by 3 inches wide. It is secured by the paino hinge, and is frankly a lot easier. I put in the orignal cut in one, then found the AMD option. I would recommend the later.
Juan
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TxDave
Joined: 22 Jul 2006
Posts: 168
Location: Temple, TX
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| Posted: Fri Jan 26, 2007 1:18 am Post subject: Re: Filling in the rib ends? |
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Hey Andy,
I'm assuming you're talking about the small gap left at the trailing edge of the control surfaces. If so, when I first started building I worried what to do about it. I went to a hanger and looked at production aircraft (Cessna, Beech, etc). I noticed they also had gaps between the aft end of the various control surface ribs and the trailing edge skin. Even a multi-million dollar Pilatus PC-12 had gaps. Attached is a photo of a Cessna 150 flap showing a pretty large gap.
If I misunderstood what you were describing, then ...never mind.
Dave Clay
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gboothe5(at)comcast.net
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| Posted: Fri Jan 26, 2007 5:24 am Post subject: Filling in the rib ends? |
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The gap is there for a reason. It simply allows moisture to drain.
Gary Boothe
Cool, CA
601 HDSTD, WW Conversion 90% done,
Tail done, wings done, working on c-section
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dredmoody(at)cox.net
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| Posted: Fri Jan 26, 2007 7:24 am Post subject: Filling in the rib ends? |
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Another thing I forgot to mention is that if you do cover/close up the gaps at the trailing edges as I did, I think it is a good idea to drill a small #40 or #30 hole to allow the assembly to drip out moisture or "breathe". The hole is way too small for critters to intrude but large enough to drip out.
Ed
---- TxDave <dclaytx2(at)HOTMAIL.COM> wrote:
| Quote: |
Hey Andy,
I'm assuming you're talking about the small gap left at the trailing edge of the control surfaces. If so, when I first started building I worried what to do about it. I went to a hanger and looked at production aircraft (Cessna, Beech, etc). I noticed they also had gaps between the aft end of the various control surface ribs and the trailing edge skin. Even a multi-million dollar Pilatus PC-12 had gaps. Attached is a photo of a Cessna 150 flap showing a pretty large gap.
If I misunderstood what you were describing, then ...never mind.
Dave Clay
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daveaustin2(at)can.rogers
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| Posted: Fri Jan 26, 2007 9:09 am Post subject: Filling in the rib ends? |
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Only my humble opinion, but the drain holes should be at least 1/4 inch.
Smaller than that blocks too easily. With the drill still in the hole, it
should also be sloped (pulled) backward when not rotating, enough that it
forms a slight negative pressure zone at the hole to suck any water out.
I agree - you don't want critters in there!
Dave Austin 601HDS - 912, Spitfire Mk VIII
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ashontz
Joined: 27 Dec 2006
Posts: 723
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| Posted: Thu Feb 08, 2007 5:39 am Post subject: Re: Filling in the rib ends? |
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| TxDave wrote: | Hey Andy,
I'm assuming you're talking about the small gap left at the trailing edge of the control surfaces. If so, when I first started building I worried what to do about it. I went to a hanger and looked at production aircraft (Cessna, Beech, etc). I noticed they also had gaps between the aft end of the various control surface ribs and the trailing edge skin. Even a multi-million dollar Pilatus PC-12 had gaps. Attached is a photo of a Cessna 150 flap showing a pretty large gap.
If I misunderstood what you were describing, then ...never mind.
Dave Clay |
Actually, I believe it's preferable to leave them open for drainage just in case water does get in there. It's not suppose to, but it can. It'd have to be perfectly sealed (welded) to never get moisture in there. The entire structure is link a fuel tank that breathes. Air is always going to get in there, and with it, humidity. You want that moisture to make it way back out too. Not only breathing of the structure but also, outright leakage, like with a car door. They always have drain holes at the bottom, or at least should. For appearances sake (and to cut down on rain water getting in in the first place), I'd say it's ok to fill the top gaps of say the rudder, but the bottom should be open, because the fuel tank-like structure will always breath in moisture and you don't want that moisture staying in there, you want it to run out.
I read in an old EAA Experimenter magazine (when they were the good grass-roots type publications rather than this slick glossy advertisement filled she-ite they're putting out now) than drain holes are particularly critical for wooden airplanes, and obviuously so. I'd say the same applies to aluminum too. The plans don't mention the holes as drains, but that's really what they function as.
I should bust out all those Experimenter mags and scan the articles and put them online here. They were really good.
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