johnvanbladeren
Member
My brother and I are starting the tail feathers now and instruction 5 on 08-page 07 requires a corrosion resistant coating on specified anodized parts. We were wondering why this same statement was not made on the anodized parts of our completed wings. Picking up the tail kits today at Vans we asked the question and this is the response from Vans.
"We did anodize the critical parts of the main wing spar. The horizontal stab does not reach nearly as high of stress levels.
When you anodize you introduce a brittle layer so we only have done this in critical areas which have been oversized to account for the anodize reduction in strength. We don’t want to oversize the entire structure.
The anodize layer we use is relatively thin to minimize the strength reduction to embrittlement. As such we are concerned about water entrapment on the HS attach parts and that is why we anodized but still felt an additional coating would be necessary. The HS attach points will be in the weather and a wet environment."
Regards
John van Bladeren
"We did anodize the critical parts of the main wing spar. The horizontal stab does not reach nearly as high of stress levels.
When you anodize you introduce a brittle layer so we only have done this in critical areas which have been oversized to account for the anodize reduction in strength. We don’t want to oversize the entire structure.
The anodize layer we use is relatively thin to minimize the strength reduction to embrittlement. As such we are concerned about water entrapment on the HS attach parts and that is why we anodized but still felt an additional coating would be necessary. The HS attach points will be in the weather and a wet environment."
Regards
John van Bladeren
