The aircraft is a collaborative effort between the U.S. Air Force Research Laboratory, the Defense Advanced Research Projects Agency, Boeing and Pratt &Whitney Rocketdyne.

这架飞机是美国空军研究实验室，美国国防部，波音公司和普惠洛克达因公司的共同研究成果

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Pratt &Whitney is exploring putting a gearbox between the fan and the turbine, because fans run more efficiently at low speeds and turbines operate better at high speeds.

而普拉特&惠特尼则正在尝试在风扇和涡轮之间加入一个变速箱，因为风扇低速运转更高效，而涡轮机高速运转则更高效。

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Pratt & Whitney is exploring putting a gearbox between the fan and the turbine, because fans run more efficiently at low speeds and turbines operate better at high speeds.

Pratt & Whitney在探索将一个变速箱放在风扇和涡轮机中间，因为风扇在低速时效率较高，而涡轮机则在高速时更高效。

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"The engine situation was outstanding and hopefully we are at the stage now where we have another milestone with getting Pratt and Whitney on the programme, " he said.

BBC: NEWS | UK | Northern Ireland | Details on plane plans revealed

The electronic warfare equipment would be built by US company Northrop Grumman while two other US companies - Pratt and Whitney and General Electric - were in competition for the engines.

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