Maximum / Minimum Volume for E-G Mid-Power Ejection Charges

Hello,

I'm designing a scale model and I'm trying to figure out the maximum volume for an effective separation using standard Aerotech E-G motors without additional pyrotechnics. Is there a formula or rule of thumb to use for such designs.

Thanks,

Keith

Are you referring to volume of the ejection charge (which is measured by weight, not volume) or volume of the body tube?

This site is probably what you're looking for:

https://www.rimworld.com/nassarocketry/tools/chargecalc/index.html

per the DMS instructions...
2. Installing the Ejection Charge and Ejection Cap
2.1 Open the supplied igniter and ejection charge kit and remove the contents.
2.2 Place the ejection charge baffle washer into the
ejection charge well of the motor bulkhead.
2.3. WARNING: Do not smoke and ensure that
there are no open flames or heat sources nearby
when installing the ejection charge. Open the
ejection charge vial and dispense the desired
amount of black powder ejection charge into the
ejection charge well of the motor bulkhead. Use
about ½ of the contents of the vial for 2.6” diameter
rockets and
smaller, and the
entire vial for 3”
and larger
rockets. Note:
additional
ejection charge
may be required
for rockets
exceeding


Tony