An emergency fighter may also have been produced to meet a need for a particular sort of fighter aircraft. For instance, Britain’s Royal Air Force used hastily converted Bristol Blenheim light bombers as twin engined heavy fighters.[2] A materials shortage arising in the course of conflict may have led to experiments with new kinds of fighters, like the Finnish VL Humu, which was based on the American Brewster F2A Buffalo, but with a higher proportion of wood in its construction.