Therefore, this study aims to validate and demonstrate a comprehensive analysis using a free wake model for the performance and vibration of the lift-offset compound helicopters. The XH-59A technical demonstrator is considered as the lift-offset compound helicopter for the assessment.
This study considers the XH-59A technical demonstrator as a validation model of the comprehensive analysis of the lift-offset compound helicopter. The XH-59A helicopter is an ABC technology demonstrator developed by Sikorsky; thus, it can fly at high-speed as well as vertical take-off/landing, hovering, and efficient low-speed flight.
Europe's principal achievement in high-speed rotary-wing flight is the 5.2-tonne Airbus Helicopters X3 compound helicopter, which is based on the EC155, but has short wings, mounting tractor propellers.
One will be a compound helicopter named LifeRCraft (Low Impact Fast & Efficient RotorCraft).
The aircraft--which is based on Sikorsky's X-2 aircraft, a compound helicopter
with coaxial rotors--will have its critical design review later this year, he added, with final assembly beginning next year.
The X2--a compound helicopter with coaxial rotors and a pusher-propeller at the rear--has flown at speeds of up to 250 knots in level flight.
The X3, a compound helicopter with a five-bladed top rotor and two short wings fitted with propellers, has flown at a top speed of 232 knots.
Sikorsky, in anticipation of Army requirements, began developing its new X-2 compound helicopter in 2005 with its own R&D dollars.
Leaps in capabilities--namely speed, agility and endurance--could come in the form of compound helicopters, Bogosian said.
The only compound helicopter
concept currently funded by the Defense Department is called the Vectored Thrust Ducted Propeller (VTDP).
Sikorsky has started building two prototype S-97 Raider high-speed compound helicopters
for the US Army's prospective Armed Aerial Scout programme.
AVX and the Boeing-Sikorsky team are offering compound helicopters
with coaxial rotors.