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Date:  1-17-2018
Number of Hours:  2.50
Manual Reference:  19-04 20-01
Brief Description:  Left Wing Cores

Pulled remaining nails and routed LFC 1 joins. Set up Left Wing cores in jigs roughly.

Assessed leftover foam for winglets, can't find any bits thick enough to achieve the plans arrangement. Found 6 bits that will do the job, avoiding joins in the rudders. Got horribly confused with left and right. Labelled the blocks "1" and "2", made sure they were mirror images and set one aside for later.

Set up one on the table, straight cut to the right height and cut the trailing edge. To achieve this I bent my brain trying to remember trigonometry and visualise what the thing is supposed to look like. I noted the angle between the base of the winglet and the trailing edge is 101.36 degrees, 11.36 more than a right angle. The angle between the tip edge and the trailing edge is 78.64 degrees, 11.36 less than a right angle. Deduce this means the tip edge and the bottom edge are parallel. Use trig to determine the fin is 46.08" high, based on the angle and the trailing edge length of 47". Pythagoras and trig agree the bottom corner of the trailing edge should be 9.25" forward of the tip corner. Marked it up on the workbench, and the trailing edge measures as 47". That and the reassurance it looks right gave me the confidence to make the cuts. A prospective builder is visiting on Saturday and it is possible he may like to cut some foam, so set up for the cut on the Left Winglet. (Maybe).
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Cleaning up foam joins

Cleaning up foam joins

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Looks a bit like a wing...

Looks a bit like a wing...

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Setting up for a Winglet cut

Setting up for a Winglet cut

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