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Old 02-24-2005, 11:02 AM
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Dust Dust is offline
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Join Date: Apr 2004
Location: Troy, Michigan
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Default Aluminum - corrosion

although these birds have little aluminum i found this at RAF

... during the disassembly the builder discovered very serious corrosion in the aluminum parts of the top right wing fitting. The corrosion would also have resulted in wing failure if it had not been discovered.

Don't forget to coat aluminum - it can corrode, even the little amout we have in these glass birds
Enjoy the build,njut av byggandet, godere il costruire, nyd bygningen, geniesse den Bau, apolafse tin kataskevi, disfrute la construcción, curta a construção, Pidä hauskaa rakentamisen parissa, bouw lekker,uživaj grade?inaslajdaites postroikoi, geniet die bou

maker of wood, fiberglass, foam dust, metal bits and one day a Cozy will pop out and swiftly whisk me from meeting old friends and family to adventures throughout the world
Old 02-24-2005, 11:41 AM
Wayne Hicks Wayne Hicks is offline
Join Date: May 2004
Location: Carrollton, VA
Posts: 1,376

Just for points of clarification:

1. This RAF discussion was about the Vari EZE's wing fittings. These are exposed to the atmosphere. RAF issued a grounding notice about this.

2. RAF also warned builder/flyers to check for corrosion of the elevator torque tubes, which can also be exposed to the weather. Nat suggested that this applies to the Cozy as well.

3. In one of the CPs, RAF did say that it is good practice to treat all aluminum pieces that go in the airframe.

This is just my personal opinion, but #3 is especially true for the aluminim laminates we use for the wing attachment points. There have been instances when water has gotten past the little covers and has pooled in the access holes for the upper wing attach bolt at the end of the spar. (You remembered to drill the drain hole, right?) Some people even stuff that area with humidity absorbant as a preventative measure.
Wayne Hicks, Cozy Plans #678

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