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ORIGINAL: HighPlains
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classic bullet shape, with a squared-off rear end, will experience flow separation at the square cornersThe range on some artillery shells is increased with base bleed systems to cut the drag.
That's really interesting. Does that mean that some air is vented from a high-pressure area to the base?
This type of shells use a gas generator system to help decrease the pressure differential. The range can be increased by as much as 30%.