I wondered what that cracking noise was…
It was the top fuselage seam giving way. I must have flexed a wing too much and surpassed the tensile strength of the thin cement used to seal the fuselage.
Well that’s what undercoat painting is designed to catch – the flaw that occurs before you add a colour coat. In this case it was easy to dig the trench out and fill it with medium cyanoacrylic cement. A quick re-prime of the top seam and it was all ready,
Note the bolt-together nature of the original Mitsubishi design.


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