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Three US service members and one civilian were killed and 16 injured in the crash. [24] Initially, it was unclear if the accident was caused by enemy fire. [25] [26] The loaded CV-22B was at its hovering capability limit, landing at night near Qalat (altitude approx. 5,000 feet) in brownout conditions, in turbulence due to the location in a gully.
The second problem also remains unsolved: no upper bound for the number of limit cycles is known for any n > 1, and this is what usually is meant by Hilbert's sixteenth problem in the field of dynamical systems. The Spanish Royal Society for Mathematics published an explanation of Hilbert's sixteenth problem. [2]
XV-15 taking off at NASA Dryden. One of the major problems with the early tiltrotor aircraft designs was that the driveshafts carrying power from the fuselage out to the wingtip rotors, along with the gearbox and tilting mechanisms at the wingtips, had substantial loads placed upon them and were heavy.
Phil Bolger designed a rudimentary solution to the problem of hull slap at anchor, which effects flat bottom boats, by making a 3 foot long, oval shaped anti-slap pad of multiple layers of ply about 2 inches deep, which were then rounded into a shallow arc. The noise is the same as chine slap familiar to owners of deep-V powerboats at anchor.
The 49er and 49er FX is a two-handed skiff-type high-performance sailing dinghy.The two crew work on different roles with the helm making many tactical decisions, as well as steering, and the crew doing most of the sail control.
A 16 ft Skiff is a class of three-person sailing dinghy with twin trapezes and a large asymmetrical spinnaker. The class is unique to Australia, where it is one of the most popular boats sailing with 75 boats registered in 7 clubs. The class has the largest fleet of high performance skiffs on the east coast of Australia.
Many of today's skiff classes are based in Australia and New Zealand in the form of 12 ft (3.66 m), 13 ft (3.96 m), 16 ft (4.88 m) and 18 ft (5.49 m) skiffs. The 29er , 49er , SKUD and Musto Skiff are all considered to have developed from the skiff concept, all of which are sailed internationally.
The North Carolina class were a pair of fast battleships, North Carolina and Washington, built for the United States Navy in the late 1930s and early 1940s.. In planning a new battleship class in the 1930s, the US Navy was heavily constrained by international treaty limitations, which included a requirement that all new capital ships have a standard displacement of under 35,000 LT (35,600 t).