When watching the Shuttle launch I've noticed three ports? open just as the SSME start up. They are closed/covered just before start, and tear? open as the engines catch. I'm guessing they are some kind of exhaust port, but for what? I've looked at the engine schematics, and it looks like the turbo pumps exhaust through the main engine bell. Here are some pics of before and after.
via International Skeptics Forum http://ift.tt/1TVH1FG
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