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Old 10-11-2021, 11:04 AM   #439 (permalink)
Piotrsko
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A roots belt is not only wider (2") but is cogged and has matching cogged pullies. At the rocket site, we used roots blowers as a high volume low vacuum roughing pump for the test chambers and were operated by 50 hp electric motors
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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