Sikorsky demonstrates new X-2 helicopter HD version2012082812:41 X2飛行的噪音極小，同時航速也超過一般直升機甚多，這和尾旋翼後推有很大關係。 相關文章 Sikorsky S97:The Raider Sikorsky S-97 Raider Sikorsky X-2 The World's Most Advanced Attack Helicopter The U.S. owns DEADLY FAST Turkish Military T129 ATAK Attack Helicopter 我要留言 HAL LCH Main Rotor AH-6S Little Bird
