Today I planed the sides of the bulkheads to match the curvature of the longerons at the fuselage stations. No difficulties were encountered, and the result is more than satisfactory.
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Planing the bulkhead side flush with a block plane. The edge has to follow the curvature of the longerons.
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Close-up at the C2 aft face. The plane rides on the longeron to transfer its curvature to the bulkhead edge.
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Result: the bulkhead side blends smoothly into the frame, ready for skinning.
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The bulkhead edge now sits flush with the main longeron.
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Another view of the flush transition between bulkhead and longeron.
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The lower corner, faired and sanded to match the frame curvature.