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 Sailplane Construction Project Session #115

Comet Sailplane Project
The wing's complete leading edge has been trimmed, sanded, and shaped. The complete trailing edge has been trimmed, sanded and tapered as well. This afternoon I went over the entire wing with 320 and then 400 grit paper for final finish sanding before covering.  At last the Sailplane's wing structure is finished and I asked Sue to take the picture below of me holding the wing finished structure.
The finished wing structure weighed in at 252 grams (8.89 oz) as shown below.
However, the right side of the wing came out slightly heavier than the left side. The wing's center line was placed on a piece of balsa triangular stock on the work table and a 3" piece of 1/8" solid lead solder was used to balance the wing structure. As you can see below, the length lead solder was inserted through holes in two of the ribs and up against the aft face of the second spar. Then it was adjusted in position spanwise and CA'd in place as shown below.  
The balanced wing structure now weighs 256 grams (9.03 oz) before covering.
At this point I will store the wing on the wing rack and go back to the fuselage for some other detail work. The fuel tank has to be plumbed with provisions for overflow and fill tubes extending through the cowl to the outside. Then exit cooling air ventilation holes have to be worked out in the cowl to insure proper engine air circulation for cooling................................Tandy

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