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David.Lehman
Joined: 10 Jan 2006
Posts: 265
Location: "Lovely" Fresno CA
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 Posted: Wed Jan 11, 2006 12:39 pm Post subject: Wing Attach Spacers?... |
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When I unfold the wings, the front spar fittings and the strut fittings mate with fuselage fittings wider than the spar/strut... Am I supposed to install spacers (washers) to fill the gap between the fittings?...
Thanx...
DVD
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lstavenhagen(at)hotmail.c
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| Posted: Wed Jan 11, 2006 12:51 pm Post subject: Wing Attach Spacers?... |
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| Quote: | When I unfold the wings, the front spar fittings and the strut fittings
mate with fuselage fittings wider than the spar/strut... Am I supposed to
install spacers (washers) to fill the gap between the fittings?...
Thanx...
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Actually, since you brought that up, I've always been curious as to why that
gap is so large there? I worry about a shear load spread out over that much
length of the pin...
Or is this simply a low load area such that this is plenty of strength?
Like I said, I've never seen any problem with this, but am curious about the
gap.
PS. there's a similar large gap where the lift struts attach to the cage. I
run a spacer made out of fuel line on here to keep the strut set up against
one side. Anyone know why this gap is wide as well?
LS
N646F
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planecrazzzy
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| Posted: Wed Jan 11, 2006 2:21 pm Post subject: Re: Wing Attach Spacers?... |
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People have put rubber spacers in there, just to keep the vibrating noise down....
Do you have a GAP SEAL that goes between your wings ??? every picture that I've seen of your plane is missing it...( important Item )
Gotta Fly...
Mike in MN
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Wed Jan 11, 2006 2:33 pm Post subject: Re: Wing Attach Spacers?... |
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Mike: That is a darn good looking gap seal. I like it.
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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David.Lehman
Joined: 10 Jan 2006
Posts: 265
Location: "Lovely" Fresno CA
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| Posted: Wed Jan 11, 2006 2:36 pm Post subject: Re: Wing Attach Spacers?... |
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| Mike Pierzina wrote: | People have put rubber spacers in there, just to keep the vibrating noise down....
Do you have a GAP SEAL that goes between your wings ??? every picture that I've seen of your plane is missing it...( important Item )
Gotta Fly...
Mike in MN |
WOW!... I answered this, hit the send button and lost the BBS... I'll try again...
Mike, I have the gap seal, I just didn't have it installed in the pictures...
I like the rubber spacer idea, could probably do the same thing with pieces of fuel hose...
Thanx...
DVD
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ô¿ô
"Both optimists and pessimists contribute to the society. The optimist invents the aeroplane, the pessimist the parachute."
--- George Bernard Shaw |
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Wed Jan 11, 2006 3:12 pm Post subject: Wing Attach Spacers?... |
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| When I unfold the wings, the front spar fittings and the strut
fittings mate with fuselage fittings wider than the spar/strut... Am
I supposed to install spacers (washers) to fill the gap between the
fittings?...
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| Thanx...
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| DVD
Dave/Gang:
Do you have the plans and instructions for your airplane?
Nothing is called for to kill that space.
john h
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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David.Lehman
Joined: 10 Jan 2006
Posts: 265
Location: "Lovely" Fresno CA
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| Posted: Wed Jan 11, 2006 3:26 pm Post subject: Re: Wing Attach Spacers?... |
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| John Hauck wrote: | Dave/Gang:
Do you have the plans and instructions for your airplane?
Nothing is called for to kill that space.
john h |
Yes John, I have the 1985 plans and I noted that they called for empty space... I guess I've spent too much time with big airplanes and I need a re-education...
Thanx...
DVD
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ô¿ô
"Both optimists and pessimists contribute to the society. The optimist invents the aeroplane, the pessimist the parachute."
--- George Bernard Shaw |
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Wed Jan 11, 2006 3:29 pm Post subject: Re: Wing Attach Spacers?... |
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[/quote]
Actually, since you brought that up, I've always been curious as to why that
gap is so large there? I worry about a shear load spread out over that much
length of the pin...
Or is this simply a low load area such that this is plenty of strength?
Like I said, I've never seen any problem with this, but am curious about the
gap.
PS. there's a similar large gap where the lift struts attach to the cage. I
run a spacer made out of fuel line on here to keep the strut set up against
one side. Anyone know why this gap is wide as well?
LS
N646F
[quote]DVD
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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lstavenhagen(at)hotmail.c
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| Posted: Wed Jan 11, 2006 3:46 pm Post subject: Wing Attach Spacers?... |
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| Quote: | Lucien:
I can assure you that the gap is the way it is because that is the way
Homer Kolb designed it. It was the same way on my Ultrastar that I built
in 1984, like 22 years ago. If you are worried about this fitting,
recommend you ground your airplane until it is fabricated in such a way
that you will be comfortable with it.
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Ok, calm down, calm down...take a deep breath.... Just curious, not being
critical (and have no concerns about the joint due to the long history of
the Kolbs, merely a curiosity)....
| Quote: | As far as I know, we have not lost the first Kolb because of Homer's design
of that fitting. Besides, even though I am not an engineer, I don't think
there is any more shear load on that pin with that much space, or if it
were snugged up tight.
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Not quite true, but the explanation as to why is a bit lengthy and I won't
go into it here since it's probably not an issue.
The gaps in these areas are merely unusual design, though, which is why I'm
curious as to why it was done that way. That's all....
LS
N646F
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FS2Kolb(at)aol.com
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| Posted: Wed Jan 11, 2006 4:00 pm Post subject: Wing Attach Spacers?... |
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In a message dated 1/11/2006 4:47:04 P.M. Mountain Standard Time,
lstavenhagen(at)hotmail.com writes:
The gaps in these areas are merely unusual design, though, which is why I'm
curious as to why it was done that way. That's all....
It there for easy folding of the wings. If the gap was not there you
couldn't swing the wings out for folding.
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lstavenhagen(at)hotmail.c
Guest
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| Posted: Wed Jan 11, 2006 4:45 pm Post subject: Wing Attach Spacers?... |
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| Quote: | It there for easy folding of the wings. If the gap was not there you
couldn't swing the wings out for folding.
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Ah, yes... Ok, that makes perfect sense.. That explains the gap at the
bottom lift strut connection too, it would be a royal pain to detach the
struts with a tight gap there...
Thanks, that answers my Q completely.... More I learn about this airplane I
tell ya the more I like it....
LS
N646F
do not archive
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ul15rhb(at)juno.com
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| Posted: Wed Jan 11, 2006 5:29 pm Post subject: Wing Attach Spacers?... |
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Dave,
I did install aluminum spacers in the lower lift strut fittings/cage attachment because I noticed the strut would move back and forth across the clevis pin. That couldn't be good for it and figured that it could cause premature wear. Is this what you are referring to?
Ralph
Original Firestar
19 years flying it
-- "David.Lehman" <david(at)davidlehman.net> wrote:
When I unfold the wings, the front spar fittings and the strut fittings mate with fuselage fittings wider than the spar/strut... Am I supposed to install spacers (washers) to fill the gap between the fittings?...
Thanx...
DVD
--------
Any pilot can describe the mechanics of flying. What it can do for the spirit of man is beyond description.
Barry M. Goldwater, US senator.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=3004#3004
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David.Lehman
Joined: 10 Jan 2006
Posts: 265
Location: "Lovely" Fresno CA
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| Posted: Wed Jan 11, 2006 5:47 pm Post subject: Re: Wing Attach Spacers?... |
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| ul15rhb(at)juno.com wrote: | Dave,
I did install aluminum spacers in the lower lift strut fittings/cage attachment because I noticed the strut would move back and forth across the clevis pin. That couldn't be good for it and figured that it could cause premature wear. Is this what you are referring to?
Ralph
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That's it Ralph, but I'm starting to understand "the why and what for" now...
DVD
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_________________
ô¿ô
"Both optimists and pessimists contribute to the society. The optimist invents the aeroplane, the pessimist the parachute."
--- George Bernard Shaw |
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Topher
Joined: 09 Jan 2006
Posts: 4
Location: Osceola, WI, USA
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| Posted: Wed Jan 11, 2006 6:13 pm Post subject: Wing Attach Spacers?... |
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Since the wing inboard ribs a fixed length, rigid structure, and the back
end is fixed I don't think you want the front end fixed as well. This point
is a pivot point and you want it to be able to pivot, transferring all loads
to the lift strut. Soft rubber spacers shouldn't effect it at all but
washers bolted up tight would definitely be a bad idea. I would recommend
leaving it open, as called for in the plans.
Christopher Armstrong
--
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Topher
Yellow Aero SSTOL |
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John Jung
Joined: 10 Jan 2006
Posts: 108
Location: Surprise, AZ, USA
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| Posted: Thu Jan 12, 2006 3:33 pm Post subject: Re: Wing Attach Spacers?... |
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Group,
I just recently installed nylon spacers on the lower lift struts. I did it because the struts were wearing the paint off on one side. I got the spacers at Lowes for a couple of dollars. They would be a hassle to put on and off if I had to fold the wings, but I don't do that any more.
On the top spar pin, I believe the extra space is there because the rear attach point slides in and out on an angle when the wings are rigged. In addition to that, the fuselages change shape slightly when the are welded. A wide gap insures that it will fit.
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John Jung
Firestar II N6163J
Surprise, AZ |
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