Build a small Rocket for L.E.O. (10 kg Payload)
Find the Delta-V Requirement for L.E.O.
The Rocket Equation:
Use Specific Impulse instead of Exhaust Gas Velocity:
Typhical Propellant Specific Impulses
Mass Ratio in terms of Weights: Copyright (c) 2000 by Rainier Anacker
Re-write the Mass Ratio in terms of Weights:
The Rocket Equation In a Form suitable for practical calculations:
Our Task as Designers:
There is a definite relationship between the Inert mass and the Propellant mass in a stage, exclusive of the Payload Mass, called Propellant Mass Fraction, Lp, which can be used to determine whether the guess for GLOW is good or bad.
Typhical Propellant Mass Fractions:
Find a more systematic Solution:
Go to Psas.xls, SHEET 1, to show bar graphs of Wp,Wi for a SSTO vehicle
Design a Two-Stage Vehicle Copyright (c) 2000 by Rainier Anacker
Go to Psas.xls, SHEET 2, to show bar graphs of GLOW2, GLOW for a TSTO vehicle
Problems that arise when using an (arbitrary) value of GLOW
Author: Rainier Anacker
Email: info@psas.pdx.edu
Home Page: http://www.psas.pdx.edu
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