Today's Message Index:
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1. 10:35 AM - chat (George Race)
2. 06:12 PM - Re: How to install the cowling sink plates? (John Marzulli)
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George
Message 2
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| Subject: | Re: How to install the cowling sink plates? |
Thanks,
I mistakenly called them "sink plates" when I meant "nutplates".
Zenith finally reopened from the holidays and I was able to get in contact
with Roger. As always he was able to straighten me out.
It turns out the manual is partially wrong compared to how Zenith shipped my
cowling.
Roger confirmed that you are indeed supposed to bore a counter sink hole
into the fiberglass to hold the nutplates onto the inner lip of the bottom
half of the cowl.
Zenith is now suggesting leaving the holes on the plates at their current
size and using A3 sized blind rivets.
Here are some photos I took on Sunday of the project:
http://marzulliphoto.net/Airplanes/Spinner-and-Cowl-questions/10852940_KXmXA/1/757077715_7r2hC
Thanks again,
John Marzulli
http://www.GenevieveMarzulli.org/
http://MarzulliPhoto.net/
http://701Builder.blogspot.com/
On Fri, Jan 1, 2010 at 10:22 PM, John Marzulli <john.marzulli@gmail.com>wrote:
> There are some details lacking in the Zenith instructions for the new style
> FFW cowling install. ;-)
>
> I have my cowling clecoed on, but am not sure about how to use the sink
> plates.
>
> Based on the instructions/HBH video, it seems like the process is this:
>
> 1) Get the cowling positioned and clecoed together.
> 2) Drill out the forward four holes where the split pieces join
> A) to AN5 on the top piece ( to let the washers rest "counter sunk" )
> B) to AN3 on the bottom piece
> 3) Attach the nutplates to the bottom half.
>
> So based on this I have a few questions
>
> 1) How do I keep the cowling lip as nicely aligned as I have it now? I
> would guess that since the holes are a little large that there is some
> slack.
> 2) Since the recieving shaft of the nutplate is larger than AN3, I will
> assume that the plate gets riveted to the inside. What is the best procedure
> for drilling the holes for the rivets without loosing alignment?
> 3) I am supposed to countersink the rivets for the nutplate. How do you
> countersink thin fiberglass like this? Making a dimple seems like a bad
> idea. Using a drilling reamer/countersink seems worse. The directions call
> for the holes to be enlarged to #30, but not which rivets to use. The soft
> brass A3s fit without enlarging, but the dome head would cause a poor fit...
>
>
> Many thanks in advance,
>
> John Marzulli
>
> http://www.GenevieveMarzulli.org/ <http://www.genevievemarzulli.org/>
> http://MarzulliPhoto.net/ <http://marzulliphoto.net/>
> http://701Builder.blogspot.com/ <http://701builder.blogspot.com/>
>
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