About this add-on

The HM.14 is most commonly described as a tandem-wing aircraft, although the main wing overlaps the rear wing in the basic design, so it almost qualifies as a highly staggered biplane without horizontal tail. Construction of the airframe employs mostly birch plywood sheet, spruce laths, steel tubing, steel cables, proprietary metal fittings and fixings, adhesives and linen fabric. The prototype HM.14 had a wingspan of 5.5m (18ft). It was powered by an Aubier et Dunne 540cc three-cylinder two-stroke motorcycle engine, producing about 17 hp (13 kW) at 4,000 rpm. The engine was connected to the…

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