So I buy these 60gram 5" mortars for the holidays. They come with fiberglass mortar tubes. The trouble is I'd like to fire these mortars higher. I'd like to get them twice as high, if possible, but even 25-50% higher would be good. I'm thinking this might be possible by using a longer tube and maybe a larger powder charge. Obviously, I'm limited by the delay fuse length, but I'm willing to bet there's still plenty of room for optimizing the launch.
I'm thinking of buying some super-heavy gauge steel tubing, say, 1" thick walls, and double or tripple the length of the original fiberglass tube. Same bore diameter, which is pretty loose. I figure on tack-welding a steel plate as the bottom of the tube. I'd rather the welds break than the tube explode.
But, I might be way off base on all this. Please guide me to success.