Raum, this sounds like a job for Bernoulli's equation, the trick will be
determining the specific gravity of the gases which is a function of
temperature which will heat exchange with the relatively high surface area
of its surroundings like the inside of your rocket tubing.
A good reference text for this is Rocket Propulsion Elements by the late
George P. Sutton. Any edition will have it, 1 through 8, or is it up to 9
now?
Ken
On Mon, Apr 10, 2023 at 10:46 AM Raum S <Rocketry101@xxxxxxxxxxx> wrote:
Hi,
After having a failure on the primary ejection charge because the hole was
too big (back up charge worked). I started to search the web for a vent
hole calculator (not av bay). But I couldn't find one. Does anyone have a
formula or calculator for this? The body tube is 610mm tall, 98mm in
diameter and the hole size was 6mm (24', 4' and 1/4' roughly).
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