David Rose obviously built the overpowered RP-4 for speed. The experimental counter-rotating propellers, inspired by a NASA project, run at an impressive rpm. Rose can connect both propellers directly to their engines without heavy reduction gearing. The props can change pitch for maximum efficiency at any speed. Type keyword s to search.
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To be eligible for an experimental airworthiness certificate, satisfactory evidence must be presented to show that the aircraft was not assembled from completely prefabricated parts or kits. The FAA recognizes that amateur builders cannot be expected to have fabricated every part that makes up the aircraft and that some parts will be acquired from commercial sources. Items such as engines, engine accessories, propellers, rotor blades, rotor hubs, tires, wheel and brake assemblies, instruments, and standard aircraft hardware, including pulleys, bell cranks, rod ends, bearings, bolts, rivets, hot air balloon burners, and fuel tanks, are acceptable and may be procured on the open market.
Homebuilt aircraft , also known as amateur-built aircraft or kit planes , are constructed by persons for whom this is not a professional activity. These aircraft may be constructed from "scratch", from plans, or from assembly kits. With some limitations, the builder s of the aircraft must have done it for their own education and recreation  rather than for profit. In the U. Alberto Santos-Dumont was the first to offer for free construction plans, publishing drawings of his Demoiselle in the June edition of Popular Mechanics.