We test fired the newly built golf ball Coehorn mortar this weekend (build info and pics to come). But the audiance was unable to track or even see the golf ball in flight against a blue sky.
What do you do to make the projectile more visible to the audiance in golf ball sized mortars?
When Mike and I shoot our Mallet's Mortar Jr. with its 1.72" bore, we use 23 gr. of FFg for 100 yards. We paint the golf balls black for visibility out to that range. We can track them against a blue sky fairly easily that way if you are looking at a point where flight apogee should occur before firing.
You appear to be claiming some kind of nebulous (or is it cumulonebulous?) direct experience with such things. Howsabout you post that video again so we can confirm it's not just a pipe (or seamless tubing) dream?
Because we were fixated on what was going on as the 137 pound jug of concrete left the 11" mortar, we didn't get any real time trajectory shots, but the two best close-up clips are posted again so the newer members and Victor can see them.
Tracy
This is the first shot from the Paixhans Monster Mortar on the Colorado High Plains. Slo-mo clip was taken at 1,200 frames per second and the range with 1 Lb. of Fg Goex BP was 210 yards.
Click on the following link and go to the original thread for the best movie clip on the super slo-mo first shot:
http://www.gboreloaded.com/forums/index.php/topic,175356.30.html The clip is on Reply # 137 or 138.
This is the long shot at the Montana Model Cannon Shoot near Cutbank, MT. 1.5 Lbs. of Fg Goex BP moved the heavy jug out to 385 yards and blew most of it's plastic water jug skin off in the process! We think vibration of the gun platform dislodged the block and tackle from the loading crane arm, not the piece of plastic that hit the rope.