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bobbyhester(at)charter.ne
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 Posted: Mon Dec 18, 2006 7:45 pm Post subject: Spar mistake! |
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ronlee(at)pcisys.net
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| Posted: Mon Dec 18, 2006 8:13 pm Post subject: Spar mistake! |
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At 08:31 PM 12/18/2006, you wrote:
| Quote: | I was back drilling my z brackets on my right wing. Somehow (I really have
no idea how this happened) I missed the pre-made hole and now have a new
3/16th inch hole in my spar about a half inch inboard of the second most
inboard Z bracket. The hole doesnąt interfere with anything and I have
adequate distance from all of the other holes. I deburred it, but am
concerned it could make the spar weaker... or something. What should I do?
Leave it? Fill it with something? Patch it? Order a new spar (I hope
not!). I emailed vans too, but wanted to hear what you guys think.
Thanks,
David
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I would get a good nights sleep and call them about it although a pic
is worth a lot. It appears that the deburring did not leave a smooth inner
surface.
Ron Lee
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bo124rs(at)hotmail.com
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| Posted: Tue Dec 19, 2006 2:50 am Post subject: Spar mistake! |
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David, check with Van's but people drill new holes in the spar web all the
time for additional wire pass-throughs.
Dana Overall
Richmond, KY i39
RV-7 slider, Imron black, "Black Magic"
O 360 A1A, C/S C2YK-1BF/F7666A4
http://rvflying.tripod.com/blackwing1.jpg
http://rvflying.tripod.com
do not archive
| Quote: | From: David Karlsberg <claypride(at)hotmail.com>
Reply-To: rv-list(at)matronics.com
To: <rv-list(at)matronics.com>
Subject: Spar mistake!
Date: Mon, 18 Dec 2006 19:31:45 -0800
I was back drilling my z brackets on my right wing. Somehow (I really have
no idea how this happened) I missed the pre-made hole and now have a new
3/16th inch hole in my spar about a half inch inboard of the second most
inboard Z bracket. The hole doesnąt interfere with anything and I have
adequate distance from all of the other holes. I deburred it, but am
concerned it could make the spar weaker... or something. What should I do?
Leave it? Fill it with something? Patch it? Order a new spar (I hope
not!). I emailed vans too, but wanted to hear what you guys think.
Thanks,
David
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brianpublic2(at)starband.
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fstringham
Joined: 10 Jan 2006
Posts: 87
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| Posted: Tue Dec 19, 2006 8:21 am Post subject: Spar mistake! |
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Dave
I would get the straight scoope from Van's. With that said it will not be a
problem. Knowing me I would probably put a rivet in it if it didn't interfer
with the Z bracket. Not a big deal just move on and drill those holes and
pound those rivets.
Frank (at) SGU and SLC wiring ...............does it ever end
| Quote: | From: David Karlsberg <claypride(at)hotmail.com>
Reply-To: rv-list(at)matronics.com
To: <rv-list(at)matronics.com>
Subject: Spar mistake!
Date: Mon, 18 Dec 2006 19:31:45 -0800
I was back drilling my z brackets on my right wing. Somehow (I really have
no idea how this happened) I missed the pre-made hole and now have a new
3/16th inch hole in my spar about a half inch inboard of the second most
inboard Z bracket. The hole doesnąt interfere with anything and I have
adequate distance from all of the other holes. I deburred it, but am
concerned it could make the spar weaker... or something. What should I do?
Leave it? Fill it with something? Patch it? Order a new spar (I hope
not!). I emailed vans too, but wanted to hear what you guys think.
Thanks,
David
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aerokinetic(at)sbcglobal.
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| Posted: Tue Dec 19, 2006 5:15 pm Post subject: Spar mistake! |
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An extra hole in your spar *will* make it weaker. However the placement and other details of the hole will be the determining factors obviously. In general, any extra holes in the spar caps are worse than holes in the web -and as the hole gets nearer to the outside edge of the top or bottom cap the problem gets worse. A hole (or even a big nick) very near the top or bottom could well render the spar scrap. Van's will probably tell what they think -but not give you anything in writing and let you know you are on your own when it comes to things being 'not as designed' -but they've seen lots of flub-ups and it won't be anything new to them I bet.
Scott
N4ZW
[quote][b]
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Bob Collins
Joined: 11 Mar 2006
Posts: 470
Location: St. Paul, Minnesota
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| Posted: Tue Dec 19, 2006 8:16 pm Post subject: Spar mistake! |
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I "knicked" my inboard flange with the bucking bar when I was bucking those four inboard ribs and bottom skin way back when. I sanded it as best I could and primed it a little and didn't think twice about it until I read this. Shoot.
Bob
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of SCOTT SPENCER
Sent: Tuesday, December 19, 2006 7:13 PM
To: rv-list(at)matronics.com
Subject: Re: Spar mistake!
An extra hole in your spar *will* make it weaker. However the placement and other details of the hole will be the determining factors obviously. In general, any extra holes in the spar caps are worse than holes in the web -and as the hole gets nearer to the outside edge of the top or bottom cap the problem gets worse. A hole (or even a big nick) very near the top or bottom could well render the spar scrap. Van's will probably tell what they think -but not give you anything in writing and let you know you are on your own when it comes to things being 'not as designed' -but they've seen lots of flub-ups and it won't be anything new to them I bet.
Scott
N4ZW
[quote]
[b]
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_________________
Bob Collins
St. Paul, Minn.
Letters from Flyover Country
http://rvnewsletter.blogspot.com/ |
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Bob Collins
Joined: 11 Mar 2006
Posts: 470
Location: St. Paul, Minnesota
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| Posted: Wed Dec 20, 2006 6:50 am Post subject: Spar mistake! |
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Theoretically, I guess, the holes drilled to attach the zbrackets made the spar "weaker" too, right? I presume it all comes down to a matter of degree when all is said and done.
Do not archive
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of David Karlsberg
Sent: Wednesday, December 20, 2006 1:53 AM
To: rv-list(at)matronics.com
Subject: Re: Re: Spar mistake!
Other than living with “weak” spar... Is there a solution (besides replacing it)?
I hope my plane does not fall apart!
David
I "knicked" my inboard flange with the bucking bar when I was bucking those four inboard ribs and bottom skin way back when. I sanded it as best I could and primed it a little and didn't think twice about it until I read this. Shoot.
Bob
[quote] [b]
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Bob Collins
St. Paul, Minn.
Letters from Flyover Country
http://rvnewsletter.blogspot.com/ |
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phil(at)petrasoft.net
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| Posted: Wed Dec 20, 2006 6:59 am Post subject: Spar mistake! |
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Although what Scott says is true, it's a matter of degree. I can't
imagine that your extra hole in the spar web could affect it in any
practical amount. Yes, it's weaker than it was but it was designed for
9g's so now it can probably only handle 8.9999999g's. (Note: There is no
math here)
Go build, go fly and be happy.
I wouldn't try any type of fix. You could rivet a cap over it but I
(notice this is just my worthless opinion) would think that you'd
introduce more potential for cracking than the existing structural issue
would call for. This airplane is very over designed and it can handle a
few small mistakes here and there.
Godspeed,
Phil Birkelbach - Houston Texas
RV-7 N727WB
http://www.myrv7.com
David Karlsberg wrote:
| Quote: | Other than living with “weak” spar... Is there a solution (besides
replacing it)?
I hope my plane does not fall apart!
David
I "knicked" my inboard flange with the bucking bar when I was bucking
those four inboard ribs and bottom skin way back when. I sanded it as
best I could and primed it a little and didn't think twice about it
until I read this. Shoot.
Bob
On 12/19/06 5:13 PM, "SCOTT SPENCER" <aerokinetic(at)sbcglobal.net> wrote:
An extra hole in your spar *will* make it weaker. However the
placement and other details of the hole will be the determining
factors obviously. In general, any extra holes in the spar caps
are worse than holes in the web -and as the hole gets nearer to
the outside edge of the top or bottom cap the problem gets worse.
A hole (or even a big nick) very near the top or bottom could well
render the spar scrap. Van's will probably tell what they think
-but not give you anything in writing and let you know you are on
your own when it comes to things being 'not as designed' -but
they've seen lots of flub-ups and it won't be anything new to them
I bet.
Scott
N4ZW
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