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.
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Amateur built and experimental aircraft | Civil Aviation Safety Authority
The world of homebuilt aircraft — officially known in the United States as Experimental Amateur-Built Aircraft — has existed as long as powered flight. They, like the homebuilders of today, used their own abilities and craftsmanship to construct safe and efficient flying machines. EAA was founded in by a group of airplane enthusiasts mostly comprised of airplane builders, although anyone with an aviation interest has always been welcome in the organization. EAA has been the organization of record as the homebuilt movement moved from simple, single-place tube-and-fabric airplanes 60 years ago to today's wide spectrum of aircraft that feature plans- and kit-built models. No matter the airplane project, one thing remains constant — homebuilt aircraft provide a path where nearly anyone can pursue their personal dream of flight. EAA's extensive resources, available through the EAA members' area or the association's staff, can help any aircraft builder or restorer to create a safe, efficient aircraft that provides recreation and education.
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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. The use of these items is not counted against the amateur builder or kit manufacturer when the FAA determines whether the amateur-built aircraft has met the major portion requirement. The use of used or salvaged assemblies for example, landing gear, horizontal stabilizer, and engine mount from type-certificated aircraft is permitted, as long as they are in a condition for safe operation.