The F22 raptor has an approximate 2:1 thrust to weight ratio. It can climb vertically and stand on its tail in a hover.(adsbygoogle = window.adsbygoogle || []).push({});

Vertical acceleration is given by: Thrust - Drag - Weight = mass * acceleration (aka gravity). The opposing force to thrust involves an acceleration due to the force of gravity which is roughly equal to 9.8 m/s/s. So a 2:1 thrust ratio, though fun, cannot overcome the force of gravity i.e. accelerate continually -- in which case the craft would reach escape velocity which is in excess of 11 km/s or in the vicinity of mach10.

Please advise about any misinformation here. As well as the mechanics that keep this craft from accelerating beyond 70k feet. How does one conceptualize per second per second acceleration? Distance per second is conceivable. Acceleration is observable. But the designation escapes me.

Thanks for any advice.

AstroNOT

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# Homework Help: Thrust 'vs' Gravity

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