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To: Sergio
Given that, wouldn't the top speed of any interstellar craft be limited to, or less than, the speed of whatever is coming out of the tail end of the craft?

It can be more than exhaust velocity. It it depends on 1) starting the mass of the vehicle + propellant, 2)the amount of propellant consumed when the thrust is complete, and 3) the exhaust velocity.

With modern chemical propulsion, a single stage burning its entire load of propellant reaches around twice the velocity of the exhaust. With staging, a payload can reach several times the exhaust velocities of the various rocket stages.

27 posted on 07/29/2015 12:05:37 PM PDT by Spirochete (GOP: Give Obama Power)
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To: Spirochete

Hmmm...hadn’t factored in the decreasing weight of the vehicle as fuel is consumbed. Thanks for the insight.


32 posted on 07/29/2015 1:07:19 PM PDT by Sergio (An object at rest cannot be stopped! - The Evil Midnight Bomber What Bombs at Midnight)
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