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GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
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 Posted: Wed Oct 14, 2009 9:45 am Post subject: Bonding |
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If this attachment comes through, you'll see the tent I made for keeping the aft area warm. I added some blankets since this pic. Yesterday, the temp stayed between 120 and 125.
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Gary
AuCountry Aviation
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GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
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| Posted: Fri Oct 16, 2009 9:34 am Post subject: Bonding |
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The temp yesterday was 150 degrees. I was going to wait the full 7 days, but, I've been able to keep the temp above 120 degrees since installation and over 150 for the last 2 days. If I extrapolate the data Hysol has, it isn't linear. So, the best curve fit I can get shows that I need 120 degrees for 5 days.
From the initial 'pulling the ELT covers off' to today, I have about 30 hours in the project. That includes stripping and sandblasting all of the pulley brackets, horizontal stub spar, etc for powder coating, trial fitting, match drilling, and bonding. About the only place I can see where time can be saved is sealing up the aft end for alodining. I'd do the next one a little differently to save cleanup time.
I still have to repair the tail tie-down area. Whoever patched it did a real hack job. BUT, they did use .040 rivets in .032 sheet metal (airframe) to attach a piece of .025 doubler.
Then, I need to prime, paint, and put it all back together.
Test samples: I made 6 sets of test samples to try various surface roughness configurations. We'll see what the results are.
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AuCountry Aviation
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