thrust force, N (lbf)

Ff

final thrust, N

Fg

Gravitational attraction force, N

Fo

initial thrust force, N

g gravitational acceration, m/sec2

g0 gravitational acceleration at sea level, 9.8066 m/sec2

g average gravitational attraction, m/sec2

G universal or Newton's gravity constant, 6.6700 xlOu m3/kg-sec2

h altitude, m hp altitude of rocket at power cutoff, m

Is specific impulse, sec k(j diffuse coefficient of reflectivity ks specular coefficient of reflectivity

I distance of moment arm, m

m instantaneous mass, kg (lbm)

mf final mass after rocket operation, kg mp propellant mass, kg m0 initial launching mass, kg m mass flow rate of propellant, kg/sec

Ma angular moment of inertia, kg-m2

IVR mass ratio of vehicle = wy/w0

n number of stages p pressure, N/m2 or Pa (psi)

r radius, m, or distance between the centers of two attracting masses, m

R instantaneous radius from vehicle to center of Earth, m

R0 Effective earth radius, 6.3742 x 106 m

S range, m t time, sec tp time from launching to power cutoff or time from propulsion start to thrust termination, sec tt time to target, sec

u vehicle flight velocity, m/sec (ft/sec)

ua orbital velocity at apogee, m/sec up velocity at power cutoff, m/sec, or orbital velocity at perigee, m/sec u0 initial or launching velocity, m/sec w weight, N (in some problems, lbf)

Greek Letters a angle of attack, or angular acceleration, angle/sec2

0 angle between flight direction and horizontal, or angle of incident radiation, deg or rad fj, gravity constant for earth, 3.98600 x 1014 m3/sec2 p mass density, kg/m3 t period of revolution, sec xjr angle of thrust direction with horizontal co angular speed, deg/sec (rad/sec)

Subscripts e escape condition

/ final condition at rocket thrust termination max maximum p power cutoff or propulsion termination s satellite z zenith

0 initial condition or takeoff condition

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What you need to know aboutâ€¦ Project Management Made Easy! Project management consists of more than just a large building project and can encompass small projects as well. No matter what the size of your project, you need to have some sort of project management. How you manage your project has everything to do with its outcome.

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