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This page contains some results for grains of real missiles:
Minuteman rocket motor A cross-section of a cracked Minuteman rocket motor was published in the Aviation Week & Space Technology issue of August 24, 1998. The picture below shows a copy of that page.
The image was scanned and imprted into GDP. Some results of the burn-back are shown in the following images. Note how easy it is to calculate the burn-back of the crack!
Hellfire rocket motor A simple picture of the Hellfire rocket motor was found on the web. The grain is a dog-bone grain. Inert slivers reduce the amount of propellant sliver mass.
This picture was used to calculate the burn-back of the Hellfire motor. The result is shown below. This is a good example of GDP's capability of handling charges which do not have a circular outside.
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