Priming the Main Spar
With all the material removed after all the countersinking, the plans call for 'spot priming' the countersinks. Instead of doing this, i masked up the spars then roughed them up using a scotchbrite pad / sandpaper wheel. They were then cleaned with acetone and finally primed using Tempo self-etching primer. This was a lot easier than setting up the spray gun for the Stewart Systems EkoPoxy (like the rest of the kit so far), plus i think it a bit more durable around fuel (these countersinks will be the fuel tank attach screws after all).
The Tempo primer isn't very good for you i don't think, so i setup the spars on the back lawn for spraying.
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| Look honey, I've installed a spa in the backyard |
Wing Cradle / Rack
I made an extension to my workbench in order to work on the spars, however i will have needed a wing cradle eventually to store the wings (or store one whilst working on the other), so i decided to make up a wing cradle based on other ideas i found online. Two pieces of stock was placed at the tip end to support the spars, which will eventually be replaced with some straps or carpet once the leading edges are completed.
I had planned to use the 2 sides of the wing crate on the outside of the stand, however one was very badly curved, so i ended up using the one as a 'spine' in the centre (ok, mostly because the logo is cool). This turned out to be too flexible, so 2 x pieces of wood were added to the outsides. This actually works very well, as there is nothing in the way of the tanks when they will need to be installed. I placed the cradle at the tip end so that each vertical sits right between 2 ribs (so i didn't impede access for clecos etc at a later date).
Main Spar Nutplates
Both main spars had their nutplates installed according to page 13-03 which was straightforward - i used the pneumatic squeezer for all of them. The nutplates on the spar webs were backriveted by shimming up the spar to allow a backrivet plate to be placed underneath. The 5 x AN470 rivets between the spar web doubler and the spar web were set using the pneumatic squeezer.
5000th Rivet
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| The 5000th rivet was one of the lower left spar fuel tank attach nutplates |
Aileron Bellcrank Brackets
The aileron bellcrank brackets were up-drilled as per the plans, deburred and primed. They were then attached to the spars. I used some TefGel on the shank of the bolts only, and each one was torqued (i used the MS21042 nut torque values, and measured the running torque in the nutplates, which was 5 in/lbs). Torque seal was applied.
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