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Joined: 26 Aug 2006
Posts: 404
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 Posted: Sun May 02, 2010 11:52 am Post subject: Flap rivets folllowup. |
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A few weeks back I asked about using an470 instead of the flush rivets. I have finished with all this and wanted to follow up. On the flap I am re-using the original glue had failed, been repaired and failed again (not by me I have no info on why this happened) and on the new rivet there were a few places where the glue had failed, likely due to handling over the years.
I riveted the new flap at 4" pitch with AN470D rivets and can report that it looks fine, so if the dimpling was to help the looks then I guess it's a personal issue as it looks quite fine to me without it. My personal standards of appearance may be quite low though as on the exiting flap that had originally been riveted with AN426 type rivets I elected to add a rivet between the exiting ones and I used the AN470 rivets for that job also. So I have one flush and one dimpled rivet alternating down the flap. To, no difference. I can see a line of shop heads on the bottom at 4" pitch and a line of factory heads on the top at 8" pitch.
The flap is much more rigid with the new rivet pattern and I expect good service life. I would heartily endorse adding 1/2 an ounce to your aircraft and using 4" pitch on the flaps as my personal feeling is that the original glue bond is not all that strong. Others have fared quite well with the 8" pitch I am sure.
Dave Goddard
KF IV 1050 / 582 / Warp
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