In university, we had a funnelator.Sure is. I lived a a block from Churchill Downs as a kid. We would find a golf ball and stand in my next door neighbor's yard and see if we could get them across two streets to the Downs. It can be done. Sometimes.... "Run!"
How to Make a Funnelator(easy) : 3 Steps - Instructables
The engineers that built it found that surgical tubing has a spring constant that varies with tension applied. The muzzle velocity was estimated at 200kmh. But, firing water balloons, because they aren't solid, would lose energy quickly and never flew straight. We managed to land water balloons at a range of 500+ meters. The party trick was that the Vanier Cup (Canadian College Football final) would be played at Varsity Stadium every year and we could launch water balloons onto the field from outside the stadium.

