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MAE2_Rocket_Build

# MAE2_Rocket_Build - Klein Flugtag Design Notes MAE 2 Boost...

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Klein Flugtag Design Notes MAE 2

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2 MAE 2 Boost Phase The boost phase of a rocket or missile flight occurs while the propulsion system is on. For the air-launcher, the boost phase ends when the fuselage leaves the launch tube. time = 0 sec time = 0.07 sec time = 0.2 sec
3 MAE 2 Boost Velocity The boost velocity is the velocity achieved when the rocket motors cut off. V b = 2 f T / m g T ≃ P  d / 2 2 V b = boost velocity f = fuselagelength T = thrust m = mass g = gravity = pistonefficiency ≃ 0.01 P = air tank pressure d = fuselage diameter T mg c.g. Note: Drag force is ignored during boost phase.

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4 MAE 2 Ballistic Parameter The coast (un-powered) phase of flight requires consideration of the drag force. The drag force of an entry vehicle is usually specified by the ballistic parameter. B = m S C D B = ballistic parameter m = mass S = reference area C D = drag coefficient The equations of motion for the rocket coast phase are: dV dt =− V 2 2 B g dh dt = V V = velocity = density g = gravity h = altitude
5 MAE 2 4 6 8 10 12 14 16 0 2 4 6 8

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MAE2_Rocket_Build - Klein Flugtag Design Notes MAE 2 Boost...

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