08-07-2009, 09:57 AM
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Launching since 1970.
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Join Date: Mar 2005
Location: Southern California
Posts: 2,188
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Quote:
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Originally Posted by BRC
Aerotech G78-4G Single Use Rocket Motor or
Aerotech G80-4T Single Use Rocket Motor
If ya happen to have one laying around !!
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The G80-4 is no longer made for a very good reason. The current production G80 motors have 137 Newton-Seconds of total impulse. They acheived this huge increase in total power obtained by using the maximum propellant mass allowed (62.5 grams) and an extremely efficient design: nozzle expanded better than the original and operating pressure is higher thanks to a new casing design.
As a result, the maximum size Model Rocket (3.3.pounds) which is usually around 4 inches in diameter, will NEED a 7 second delay time to reach apogee. The older version of the G80 motor had a lower total impulse, so a fat and heavy rocket would require a shorter delay time since they would not fly as high or fast.
Old version: http://www.nar.org/SandT/pdf/Aerotech/G80.pdf
New/current version: http://www.nar.org/SandT/pdf/Aerotech/G80-20071207.pdf |