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<p>basis for an unsuccessful proposal for what eventually became the <a href="page.php?w=Lockheed_Martin_X-33">Lockheed Martin X-33</a>.</p>

<p><big>Non-axisymmetric shapes</big></p>
<p>Non-<a href="page.php?w=axisymmetric">axisymmetric</a> shapes have been used for crewed entry vehicles. One example is the winged orbit vehicle that uses a <a href="page.php?w=delta_wing">delta wing</a> for maneuvering during descent much like a conventional glider. This approach has been used by the American <a href="page.php?w=Space_Shuttle">Space Shuttle</a>, the Soviet</p><p>
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