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Old 05-21-2020, 08:08 AM
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The nozzle expansion ratio is actually pretty close to optimum for the motor operating pressure, which is low by typical composite propellant model rocket motor standards.

Quote:
Originally Posted by Jerry Irvine
The exit cone is surprisingly short so is under expanded. They might be slightly better off by increasing the expansion angle to >30 degrees, perhaps 45 degrees. Heck, make it a curved shape since it is SU ceramic!
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