手开式降落伞 free-fall parachute; free-fall type-parachute 速开式降落伞 fast-opening chute; quick-release parachute .
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DHV requires the parachute to open in less than 60 vertical meters when the load (simulating the pilot) and the parachute are dropped in free fall, side by side, at the same time.
而DHV要求在带着模拟飞行员必须在60米的垂直下落距离内打开，下抛时备份伞是同假人处于同一高度并列放下。
18 parachute free fall time will have a strong sense of weightlessness?
跳伞的自由落体那段时间会有强烈的失重感吗？
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