What were they calculating?

After I took off the inside shell, I found some interesting notes. The one pictured here caught my attention. First I thought, they were somehow calculating the length of something but frankly, I have absolutely no idea what this is. But see for yourself...

Hoists

Not much progress this past week, despite the boss checking in on the progress (see pic below). I managed to build the hoists (will blog on Naddy's the renovation thread on airforums about them). One very nice airforum member provided a detailed plan, which makes it a matter of a few hours to construct them. They are done and they are up. I will say that it is a very bad idea attempting to put one of the gantry cranes up by yourself. I am 6' 7" and I tried and I miserably failed. The hoist came crashing down on me. The experience included a few bruises and a strained AC joint.
My wife had choice words for me, cannot blame her really. Anyhow, the gantry cranes are up and I am very excited - most of our neighbors are too :-)

    

Finally empty

All inside shell pieces are taken off and the insulation is taken out and disposed too. After that I vacuumed the trailer thoroughly. The insulation was a yucky affair and it is probably a good idea to wear an aspirator - not because of the insulation per se but the potential diseases that are associated with rodent left-behinds.

   

Ribs aluminum

I answered one of my own questions yesterday. I wondered what aluminum was used for the ribs in the 1967 Overlander. As it turns out, one of the ribs had the aluminum type stamped on it. It is 6061-T6. I need to order some channel to replace and complete my c channel. Mine is 1 1/2" wide and 1/2 tall and I have a hard time finding that in 6061 but it is readily available in 6063-T52. That is a very corrosion resistant but also much softer aluminum. I hope the softness will not be a problem. Over at Airforums, a lot of guys just form their own channel out of rest pieces of 2024-T3 and I think I will do the same to strengthen bits here and there. My trailer has lots of channels pieces formed from scrap pieces that way.