西科斯基描述了S97试飞的目标，包括创造世界纪录啥的

                               
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Sikorsky outlines goals, timeline for S-97 flight test
Source: Flightglobal.com a day ago
As Sikorsky continues to inch toward first flight of the S-97 Raider demonstrator, company officials have outlined the scope and duration of the flight test programme for the high-speed, compound helicopter.

Sikorsky has identified three key performance parameters for the S-97 to achieve over a roughly 1.5-year long flight test programme, says Chris Van Buiten, Sikorsky’s vice-president of engineering.

The flight test programme will seek to achieve a manoevrability record for a rotorcraft: a 3g-turn at a maximum speed of 220kt, Van Buiten says in an interview.

“That’s something a helicopter has kind of never done,” Van Buiten says.

The second goal is to fly at 220kt while carrying a full weapons load, he says.

Finally, the S-97 will attempt to demonstrate a new level of hover efficiency for a rotory wing aircraft, he says.

There is an aerodynamic metric known as the isolated rotor figure of merit. A score of 100 means the rotor system is using the rotor’s power as efficiently as theoretically possible. Most helicopter rotor systems are unable to exceed a score of 75, Van Buiten says. Sikorsky declines to reveal the desired score for the S-97, but Van Vuiten notes the company has demonstrated a score of up to 80.


The higher the score, the greater the performance of the vehicle in hover. Sikorsky wants to demonstrate that the S-97 can achieve a hover with a full weapons load at 6,000ft elevation with a temperature at 35 degrees Celsius (95 degrees Fahrenheit), Van Buiten says. With a reduced load, the S-97 also should be able to hover at 10,000ft at the same temperature hevel, he adds.

Sikorksy first demonstrated the coxial-compound, rigid-rotor configuration with the Collier Trophy-winning X2 prototype, which flew 23 test flights. The number of sorties for the S-97 will be slightly higher to demonstrate the full envelope for the aircraft.

What happens after Sikorsky completes the S-97 demonstration is unclear. The aircraft is too small to compete for the army’s Future Vertical Lift (FVL) requirement. The army is also eliminating its armed aerial scout fleet as part of a broader restructuring of the aviation branch, although army officials say the requirement for such a helicopter remains.

“Our job is to demonstrate a super-compelling option and show that it’s possible to have FVL-level technology much sooner than you thought,” Van Buiten says.. “Raider serves as a great risk reduction for that technology.”

西科斯基公司公布S-97飞行试验项目目标和周期
2015-04-02
国外国防科技文献资料快报   【据英国《飞行国际》网站2015年3月31日报道】西科斯基公司近日表示，S-97首飞准备工作正在持续推进，并且透露了飞行试验项目的试验目标和周期。
    西科斯基公司为S-97飞行试验项目制订的项目周期为1.5年，并设定了3个主要验证目标：机动性，在最大飞行速度——220节（407千米/时）飞行时达到3g的转弯过载；飞行速度，在满载武器载荷状态下达到220节最大飞行速度；此外，项目还将尝试将其悬停效率提高到80%左右，而目前绝大多数直升机的旋翼系统最高只能达到75%。西科斯基公司希望S-97能够在满载武器状态下、35℃环境中的悬停升限超过6000英尺（1829米），并且在载荷较小的状态、35℃环境下悬停升限达到3048米。（中国航空工业发展研究中心 李昊）