Ejection Charge Size

[MikeSModerator]

I have a bad habit of having too much charge.

I am putting togeather my Big Nuke 5.54″ To Launch in
July with a I211. I know it will not go out of site but
it should be a slow and low flight.

The well on a 38/480 RMS holds 1.5 grams.

A couple places I have read say to use 1 gram per 6″
of length. My Lord that seems like a lot.

Questions.

Is that correct?
I am going to test but I do not want to damage it.

If it is correct…..What is the best way to increase the well size?
I will not be using electronics.

I have a electronics. Is this a time it would be a must?
Set for apogee.

A Big Nuke is 5 3/8 ID..I have made it an anti zipper.

http://www.info-central.org/construction_antizipper.shtml

The area between the bottom of the nose cone and the top of the
booster section is less than 1′

Thanks Mike

[Anonymous]

Go to http://www.info-central.org/index_recovery.html and click on “calculators” then “Black Powder”.

Use this as a STARTING point. Always ground test. I am frequently surprised at how little or how much bp it may take for a project. I have several projects that use 0.25g (so little I had to make a measuring cup incremented in 1/10th of a gram) and some that use 12g. There is no substitute for ground testing.

One word about ground testing — on smaller charges, the match itself can exert a fair amount of energy. ALWAYS use the same match in ground testing that you will in flight so your results are consistent.

Suggest YES on the electronics.

Hope that helps…

JW

[MikeSModerator]

It does. Thanks

[Author]

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