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<h2 class="hd hd-2 unit-title">Lecture Files & Content</h2>
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<p><a href="/assets/courseware/v1/ad037025e79da18e7ec7fe26c7ea24f1/asset-v1:MITx+16.885x+3T2019+type@asset+block/Lecture_7___J._R._Thompson_-_Space_Shuttle_Main_Engines.pdf" target="[object Object]">Lecture Slides</a></p>
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<h2 class="hd hd-2 unit-title">Space Shuttle Main Engines: Part I</h2>
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<h2 class="hd hd-2 unit-title">Space Shuttle Main Engines: Part II</h2>
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<h2 class="hd hd-2 unit-title">Space Shuttle Main Engines: Part III</h2>
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<h2 class="hd hd-2 unit-title">Space Shuttle Main Engines: Part IV</h2>
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<h2 class="hd hd-2 unit-title">Questions</h2>
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Question 1
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<legend id="f0e3f1c4154b4b8096b3bb138bd48fef_2_1-legend" class="response-fieldset-legend field-group-hd">To keep the nozzle from melting, liquid oxygen is run through tubes lining the outside of the nozzle, taking away heat from the nozzle material.</legend>
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Question 2
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<legend id="2b4307dbcd394c9f8ddf72b739fd1e91_2_1-legend" class="response-fieldset-legend field-group-hd">Why was it necessary to design the Space Shuttle Main Engines so that they could be throttled down to 65% of the rated power level?</legend>
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<input type="radio" name="input_2b4307dbcd394c9f8ddf72b739fd1e91_2_1" id="input_2b4307dbcd394c9f8ddf72b739fd1e91_2_1_choice_1" class="field-input input-radio" value="choice_1"/><label id="2b4307dbcd394c9f8ddf72b739fd1e91_2_1-choice_1-label" for="input_2b4307dbcd394c9f8ddf72b739fd1e91_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_2b4307dbcd394c9f8ddf72b739fd1e91_2_1"> Throttling down to 3g late in the launch sequence allowed the trajectory to be designed so as to ensure that the external fuel tank fell down over the ocean rather than over a land mass.
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<input type="radio" name="input_2b4307dbcd394c9f8ddf72b739fd1e91_2_1" id="input_2b4307dbcd394c9f8ddf72b739fd1e91_2_1_choice_2" class="field-input input-radio" value="choice_2"/><label id="2b4307dbcd394c9f8ddf72b739fd1e91_2_1-choice_2-label" for="input_2b4307dbcd394c9f8ddf72b739fd1e91_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_2b4307dbcd394c9f8ddf72b739fd1e91_2_1"> The Space Shuttle was designed for a maximum ascent load of 3g&#8217;s. As more propellant was burned and the Shuttle became less massive, continuing to run the engines at full thrust level would have led to an acceleration greater than 3g&#8217;s, overstressing the vehicle.
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