Matches in DBpedia 2015-10 for { ?s ?p "A human-powered aircraft (HPA) is an aircraft belonging to the class of vehicles known as human-powered vehicles. Early attempts at human-powered flight were unsuccessful because of the difficulty of achieving the high power-to-weight ratio. Prototypes often used ornithopter principles which were not only too heavy to meet this requirement but aerodynamically unsatisfactory.As of 2008, human-powered aircraft have been successfully flown over considerable distances. However, they are primarily constructed as engineering challenges rather than for any kind of recreational or utilitarian purpose."@en }
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- Human-powered_aircraft abstract "A human-powered aircraft (HPA) is an aircraft belonging to the class of vehicles known as human-powered vehicles. Early attempts at human-powered flight were unsuccessful because of the difficulty of achieving the high power-to-weight ratio. Prototypes often used ornithopter principles which were not only too heavy to meet this requirement but aerodynamically unsatisfactory.As of 2008, human-powered aircraft have been successfully flown over considerable distances. However, they are primarily constructed as engineering challenges rather than for any kind of recreational or utilitarian purpose.".