I need to clear a grove of 100ft pine trees and it just ain't
happenning. My sling shot is only making it to a height of about 70ft.
Way short.

I've built a canon from sched 40 PVC with a 4" section reduced to a to
1" section which is about 4ft long. I'm using lighter fluid and a spark
ignition. A 1" dowel weighted with 2oz of lead fits in the 2" PVC with
a close fit. This still doesn't get over the grove of trees. It seems
the lighter fluid just doesn't have enough power. Maybe I'm putting in
too much or not enough fluid. How do you know if you have the right
fuel air mix? I've heard that some use butane or propane in these.

Thanks
Bob Brunius