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Re: All metal Mosquito ??
No. Wooden aircraft are heavier than metal aircraft (and the main component of the Mosquito was not balsa but Spruce.) The main reason for this appears to be that the strength of the wood cannot be relied upon, so greater safety factors are required. Directly comparable cases are the wings of Soviet fighters, which changed from wooden spars to metal ones once the supplies of aluminium were sufficient. Attempts to create wooden versions of aircraft designed in metal end up heavier - see the Nakajima Ki.84 for an example.
One other advantage of metal is that it provides more internal space than the thick skins and internal structure of wooden aircraft.
Heavier aircraft are not necessarily slower, as weight has little effect on top speed. The wooden aircraft may be faster, because of a smoother external surface without steps and gaps between the panelling.
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