SPACE: Launch from ULDB?

From: Michael Lorrey (
Date: Wed Mar 14 2001 - 08:36:54 MST

A new NASA program is the Ultra Long Duration Balloon, which can carry
up to 1600 kg at an altitude minimum of 33.5 km for periods of up to 100
days. What is the mass fraction required to launch from the 33.5 km
altitude at the equator and gain a 200 km orbit? (btw: what is the
equation to use to calculate mass fractions? Spike, can you post up your

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