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Motors for model rockets [1] and high-powered rockets [2] (together, consumer rockets) are classified by total impulse into a set of letter-designated ranges, from ⅛A up to O. The total impulse is the integral of the thrust over burn time.
High-power rockets are defined as rockets flown using commercially available motors ranging from H to O class. In the U.S., the NFPA1122 standard dictates guidelines for model rocketry, while NFPA1127 is specific to high-power rockets. In most U.S. states NFPA1122 has been adopted as part of the legal code. A smaller number of states use NFPA1127.
Model and high-power rockets are designed to be safely recovered and flown repeatedly. The most common recovery methods are parachute and streamer. The parachute is usually blown out by the engine's ejection charge, which pops off the nose cone. The parachute is attached to the nose cone, making it pull the parachute out and make a soft landing.
An appalling accident rate [5] led individuals such as G. Harry Stine and Vernon Estes to make model rocketry a safe and widespread hobby by developing and publishing the National Association of Rocketry Model Rocket Safety Code, and by commercially producing safe, professionally designed and manufactured model rocket motors. Model rocketry by ...
High-power rocket liftoff. Any model rocket using a single motor greater than 160 Newton-seconds of total impulse, or multiple motors with a total thrust of 320 Newton-seconds, is propelled by a combination of motors having a total of more than 125 grams (4.4 oz) of propellant weight, or weighs more than 1,500 grams (53 ounces) with motors ...
A parade-like atmosphere was felt along Hwy. 395 in Hesperia as crowds viewed two massive “Solid Rocket Motors” from Space Shuttle Endeavor pass by.
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