Hi everyone! I've been reading this forum long time now and I have built few hybrids aswell. Recently I have cranked up my mixes and I started to think about that if I have chamber, lets say 30ml and I go for X20 mix with MAPP gas with 4,66% mixture. So equation is then 0,0466 X (30ml + 1,5ml) = 1,4...

This is just a guess but I would say roughly 1100J of energy at muzzle. Few years ago I experimented quite a bit with high mix hybrids and figured out some formulas that can be used to estimate muzzle energy.