Today's Message Index:
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1. 08:06 AM - First major mistake of my project on HS spar countersinking. Need opinions on fix! (Bob Smith)
2. 08:14 AM - Re: First major mistake of my project on HS spar countersinking. Ne... (Neilekins@aol.com)
3. 06:43 PM - Re: First major mistake of my project on HS spar countersinking. Need opinions on fix! (John Oliveira)
Message 1
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| Subject: | First major mistake of my project on HS spar countersinking. |
Need opinions on fix!
--> RV9-List message posted by: "Bob Smith" <rvator@lindonnet.com>
Hi, folks! I've appreciated all the help people have given on this
list, and now I've got my first major screw-up to deal with. I'm a new
RV-9 builder working on my horizontal stabilizer, and made a mistake
countersinking the spars - I went too deep. I did not read section 5 of
the manual carefully enough and tried to countersink enough to get the
dimpled skin material to lie flush on the spar. Bad idea! Now many of
the holes are slightly enlarged. I did not discover this until I was
ready to rivet on the back spar, which appears to have been done
slightly deeper than the front spar, though both are too deep.
I talked to factory support via e-mail about this and their suggestion
was to use a 0.032 backing strip that I use to sandwich the spar from
behind. This would mean drilling out all the rivets I've put in the
front spar and putting strips in between the rib bays, and also the back
spar.
While I don't really want to start over, I'm only about 40 hours into a
1500 hour project, so that is an option I could tolerate. Do you
guys/gals think the backing strips would work OK? I'm concerned that in
drilling out all the rivets that are already in the spar that I risk
messing up the holes even more, and having to drill them out and use
larger rivets, and need a larger dimple set, etc, and basically end up
with a cobbled-together mess.
Anyway, any opinions appreciated!
Bob Smith
Message 2
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| Subject: | Re: First major mistake of my project on HS spar countersinking. |
Ne...
--> RV9-List message posted by: Neilekins@aol.com
I would get a new spar. Its your butt up there. It cant cost that
much....Neil
Message 3
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| Subject: | Re: First major mistake of my project on HS spar countersinking. |
Need opinions on fix!
--> RV9-List message posted by: "John Oliveira" <oliveira@frontiernet.net>
that is a common problem. Follow the factory advice. I had some holes that
were also to large and just used a backing plate as they suggest. No harm
done. Plenty strong enough.
Chalk it up to experience.
John Oliveira
RV9a - N909RV Reserved
Working on fuselage
----- Original Message -----
From: "Bob Smith" <rvator@lindonnet.com>
Subject: RV9-List: First major mistake of my project on HS spar
countersinking. Need opinions on fix!
> --> RV9-List message posted by: "Bob Smith" <rvator@lindonnet.com>
>
> Hi, folks! I've appreciated all the help people have given on this
> list, and now I've got my first major screw-up to deal with. I'm a new
> RV-9 builder working on my horizontal stabilizer, and made a mistake
> countersinking the spars - I went too deep. I did not read section 5 of
> the manual carefully enough and tried to countersink enough to get the
> dimpled skin material to lie flush on the spar. Bad idea! Now many of
> the holes are slightly enlarged. I did not discover this until I was
> ready to rivet on the back spar, which appears to have been done
> slightly deeper than the front spar, though both are too deep.
>
> I talked to factory support via e-mail about this and their suggestion
> was to use a 0.032 backing strip that I use to sandwich the spar from
> behind. This would mean drilling out all the rivets I've put in the
> front spar and putting strips in between the rib bays, and also the back
> spar.
>
> While I don't really want to start over, I'm only about 40 hours into a
> 1500 hour project, so that is an option I could tolerate. Do you
> guys/gals think the backing strips would work OK? I'm concerned that in
> drilling out all the rivets that are already in the spar that I risk
> messing up the holes even more, and having to drill them out and use
> larger rivets, and need a larger dimple set, etc, and basically end up
> with a cobbled-together mess.
>
> Anyway, any opinions appreciated!
>
>
> Bob Smith
>
>
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