Throwline training and climbing 9/28/26

I have replaced the barrel with white sch40 pvc because the original barrel warped when I left the cannon in the hot car after taking it to the park to practice while my daughter played.

Any bag that's gonna launch well generally has a snug fit and requires tamping, but I have found that one make induce self tamping by rhythmically shaking the whole device with a hard stop at the bottom, ideally landing the butt end on something like a piece of wood or into apprpriate soils. I have dropped it onto the steel toe of my boots in urban envrions when I didn't have a tamper. nowadays, I have a dedicated stivk that lives with it for tamping.

It's probably worth mentioning that most bags are cordura type nylon. Also, one frien of mine has an aluminum barrel, and his still has a nearly 1:1 relationship of height to pressure, but he generally has to add a couple of pounds. It becomes about 10 extra pounds when you are aiming for higher than 120.
 
Yeah, I spotted some inconsistency for the required air pressure for height on the advertisement page. It's probably got it's variables like eg tamping, barrel type etc.

For fun if you've got the right version of iphone, shoot a 240 fps vid of you cranking the ball valve and the bag exiting, and barrel kick just like the slo mo guys on youtube. Could be enlighteming. Recommend a tripod and a camera op assistant. If you want to calibrate stick a ruler in the view near the barrel. Or just scale in "barrel diameters" and convert after.
 

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