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Along the back of the D cell, at the top and the bottom of the spar are long layers of carbon fiber belts that run the entire length of the spar. There
are several layers of belts, near the nose, with decreasing layers toward the tips. These belts provide the main load bearing strength in tension and
compression, with the front or curved portion of the D cell providing torsion stability.
The belts are looped around steel connectors, at the top and bottom of the D cell, at the nose. This is where the two spars attach to the aluminum
keel.
