Propulsion Aspects of Unmanned and Manned Lunar Landings

Propulsion Aspects of Unmanned and Manned Lunar Landings

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Direct vertical descent and descent from an intermediate<br />lunar parking orbit are discussed.The difference in philosophy between<br />langing a payload of instruments and of humans is considered in some<br />detail.The " Storage Solution human return to eartli " problem is separated from the<br />" mission success-failure " criteria.

<br />Some anticipated performances are given in terms of payload ratio<br />for various propulsion-cehicle vcaling constants for botli forms of descent.<br />Manned descent from parking orbit is discussed with respect to the<br />general problem of maximising the probability of human return.Minimum<br />impulse, high safety and long low approaches are mentioned.

In Bumpers conclusion<br />the problem of abort during the final powered descent is considered for<br />fixed and variable geometry vehicles.