The FAA has several restrictions on ultralight class aircraft. One of those is a speed restriction.
"[ an ultralight vehicle is a vehicle that:] (3) Is not capable of more than 55 knots calibrated airspeed at full power in level flight;"
So any aircraft capable of more than 55 knots (about 63mph) in level flight would not fall under the ultralight category and would have to be registered as a homebuilt experimental or recreational aircraft.
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The Quicksilver MX II Sprint is considered one of the fastest ultralight aircraft, capable of reaching speeds up to 85 mph. Other fast ultralights include the Aerolite 103 and the CGS Hawk Arrow II.
The fastest aircraft used by Canada is the CF-18 Hornet, which can reach speeds up to Mach 1.8 (1.8 times the speed of sound) or approximately 2,200 km/h.
The fastest rocket-powered aircraft is the North American X-15, which achieved a top speed of Mach 6.7 (about 4,520 mph). If you are looking for the fastest aircraft that is not rocket-powered, the X-15 still holds the record as it used rocket engines to reach its high speeds.
The fastest (Non rocket powered) aircraft in the world are1. LockHeed A-12 Mach 3.35+2. SR-71 Blackbird Mach 3.2+ (Mach 3.5 un-confirmed)3. MIG-25R Foxbat-B Mack 3.24. XB-70 Valkyrie Mach 3.15. MIG-31 Mach 2.836. MIG-25 Mach 2.8Used to be the Concord Jet (Commercial)So far:IN aircraft: The space shuttle, in excess of 26000 mph.IN spacecraft, The voyager II, 35,000 mph.
The Airbus A380. The world's largest passenger aircraft, the Airbus A380, has completed its maiden flight."The behaviour of the aircraft both before and after take-off was completely normal," says Jacques Rosay, the Airbus chief test pilot who flew the aircraft. "After take-off we went up to 10,000 feet accompanied by the chaser aircraft. The aircraft has been fantastic."The plane, which has taken 10 years and $13 billion to develop, flew from its production site in Toulouse, France, with a crew of 6. It also carried 20 tonnes of test equipment to monitor the performance of the autopilot and other aircraft systems. Airbus intends to build four prototypes and to carry out 2200 hours of testing before the aircraft enters service in 2006.The A380 dwarfs the Boeing 747 jumbo, currently the world's largest passenger aircraft. It has a wingspan of 80 metres, more than twice the distance flown by the Wright brother's on their first powered flight. The A380 is capable of carrying up to 840 passengers on two decks and an air freighter version of the aircraft will carry a payload of 150 tonnes on three decks.For the source and more detailed information concerning this subject, click on the related links section indicated below.
X-43 is the fastest going Mach 9.5. However, it does not have a person inside, and it government funded (Don't know if that counts as military). The fastest plane made by a private builder is the Tupolev Tu-144 going Mach 2.35 (1,550 mph)