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Hurri had a complete wing re-skin from fabric to aluminium.
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Which is already referenced in 1939 manuals. The skin stressed type wings were strength tested in 1940 for a 6700lb load.
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Also, most of the props were de-havilland wich was more effective but heavier.
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25lb.
A fully equipped MkIIa was 6998lb, according to the weight and balance chart in the manual. It essentially had all modifications that were included in the Mk.I, plus a few extras, and a heavier XX engine installation.