The M.39B Libellula (from Libellulidae, a taxonomic family of dragonflies) was a Second World War tandem wing experimental aircraft built by Miles Aircraft, designed to give the pilot the best view possible for landing on aircraft carriers.
To prove the concept Miles designed and built a 5/8th scale version, the M.39B, which flew on 22 July 1943, showing no “undesirable handling” characteristics. It coincided with interest by the authorities in unorthodox designs for large aircraft. The rear wing was mounted higher than the forward one to avoid downwash and give ground clearance for the propellers. The M39 design had inboard flaps and outboard ailerons on the rear wing and the front wing had an auxiliary aerofoil/flap/elevator device, which could vary the wing area without changing lift coefficient.[5]
That… is an odd-looking aircraft.
Wild, the things they tried back in the 40s!
So why didn’t they eventually go with it?