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Re: pneumatic catapults
In addition to the items above:
The volume of each cylinder (or more precisely, the volume filled by each solenoid valve in completing the stroke) is more important than the bore or stroke separately, though a short, wide cylinder will be connected nearer the axis of launcher rotation, and a long, thin one near (or past) the boulder.
IIRC when I did our calculations, somewhere around 8 or 10 cubic inches was optimal. This was using airflow through a standard 1/8" NPT port and a 12" ball movement during the launch; a high flow port or a longer throw would allow a larger cylinder, while a shorter ball movement or smaller port would require smaller volumes, and thus more solenoid valves.
For best results, include an air tank on the low pressure side of the regulator. If the air has to work its way through the regulator during the stroke, you won't get the advantage of high-flow or multiple solenoid valves.
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Last edited by GeeTwo : 26-10-2016 at 17:24.
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