This is a good way to make a big loud and hot fireball that produces a great smoke ring every time.
Use a 3 or 4 inch mortar tube (fiberglass works fine for 3 and 4 inch, make sure first it is leakproof) Fill the first 2 inches with water then fill to within 2 inches of the top of the tube with a mix of Petrol and Diesel 85/15 or 80/20 works just fine.
For lift charge approx 60 gms of 2FA for a 4 inch and 45gms for a 3 inch is placed in a double plastic bag along with 2 e matches ( test to make sure the e matches are good ).
Twist the neck of the bag around a few times and bend it over against the sides of the bag. Now wrap tightly with some good quality black PVC electrical tape. First cover the bag surface in one direction then again at right angles to the first wrap so none of the plastic bag is visible and it has 2 layers of tape all over. You now have a ball of B.P with 2 matches poking out. You don't need more tape the B.P does not need to be confined well to work
The bag can be placed into the mortar up to an hour before firing.....Putting the 2 inches of water in the mortar first ensures the tape is not softened by the Petrol/Diesel mix. Give yourself a good 30 foot of scabwire to connect to your firing device....you don't want to next to this if it goes off unexpectedly !
2 matches ensure ignition.....it's no fun having to empty out the mortar if it fails to fire.
2 inches of water and 2 inches empty at the top of the tube will ensure no petrol ends up burning on the ground.
If you're worried about the mix not igniting add a pinch of Titanium to the B.P.
Edited by bangkokpyro, 09 January 2014 - 11:03 AM.