I'm in the process of building some larger MPR rockets, 2.5", BT-80, and 3". The 2.5" will probably have around 18" of body tube that will need to be pressurized (probably OK) by the ejection charge. But the 3" rocket will have some 24" of body tube between top MMT centering ring and payload bulkhead. Someone somewhere posted that the 24mm reloads have 0.5g of BP, the 29/40-120 reloads have 0.7g. I'm wondering if this will be adequate for the larger tubes I'm using. You DD guys have an easy route to ground test, but I don't want to tie the rocket to a stump and waste a reload to see if the nose cone and/or payload bay will pop off.
I did find an online calculator - https://www.insanerocketry.com/blackpowder.html - which is suggesting that the charge for a 3" tube 24" long needs to be ~1.0g. Has anybody been supplementing their 24/40 or 29/40-120 loads?
Thoughts?
Hans.
I did find an online calculator - https://www.insanerocketry.com/blackpowder.html - which is suggesting that the charge for a 3" tube 24" long needs to be ~1.0g. Has anybody been supplementing their 24/40 or 29/40-120 loads?
Thoughts?
Hans.