A LOOK AT MANNED ENTRY AT CIRCULAR TO HYPERBOLIC VELOCITIES

Author:

LOVE E.1,PRITCHARD E.1

Affiliation:

1. NASA LANGLEY RESEARCH CENTER, HAMPTON, VA

Publisher

American Institute of Aeronautics and Astronautics

Reference56 articles.

1. Some mention of the possible effect that use of pitch modulation4,26-28 in the pullout might have upon the results presented thus far seems appropriate at this time. In this connection, modulation restricted to the regime between and (L/D)m= is the mode of possible interest, with both l i f t and drag being modulated. The prime justification for pitch modulation in pullout is reduction of decelerations and widening of corridors. However, modulation of this type, as compared with pullout at increases both heat rates and heat loads. Estimates indicate that for LID = 1, the penalty in heat load is relatively moderate, but by no means insignificant; further increase in L/D soon brings about sizeable increase in the heat load penalty. The prime questions are: in the absence of pitch modulation i n pullout are the accelerations so large and the corridor width so small that pitch modulation in pullout i s a necessity; or second, do the advantages of incorporating pitch modulation in pullout justify the heating penalty incurred? For the highest velocity considered in this study, it is doubtful that this point has been reached. However, in light of the desirability of entering at high CL with subsequent roll modulation, the addition of some pitch modulation capability for use during and after pullout - with rollmodulation remaining the primary mode - might offer a fuller realization of the aerodynamic performance potential without a prohibitive heating penalty, provided L/D does not exceed about one and the pitch modulation is sufficiently restricted. Heat Protection

2. sumed to be 2000 pc'unds for the

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