To match these needs,a bigger wing aspect ratio and winglet are adopted as the improvement measures,hopefully the lift-drag ratio of the modified UAV could be increased.

• 为延长某无人机的留空时间,加大航程和提高升限,用适当加大机翼展弦比和加装翼尖小翼的办法对原型机的气动特性进行了改进,以期能使该无人机的升阻比有较大提高。