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LNvv - The Water Rocket Explorer
Propulsion Force Summary Sheet. m1 v1 mexh vexh. Momentum exh exh vmvm о о . . 1. = p p v dt dm dt dv m . . 1. = > dm1 = dmp= dmexh. > 1. 1 . m dm v dv p.
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Propulsion Force Summary Sheet. m1 v1
mexh vexh
Momentum
r r m1 .v = m exh .v exh m1 .
dv dm p = .v p > dm1 = dmp= dmexh dt dt
>
dv = −v p .
dm1 m1
Thrust Force
r r dI F= dt
>
r d r F = .mp .vp dt
r r F = m& p .v p
>
Impulse Specific Impulse Isp in seconds
I sp =
Fth m& p .g
Tsiolkovski Formula
v 2 − v1 = v p .Log e
m1 m2
∆v = v p .LN . mm12
∆v
m1 v =e p > m2
m p = m1 − m2
>
m p = m1 − m1 .e
−
∆v vp
∆v − vp m p = m1 .1 − e
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