RE: 3 line tanks - 3rd line bend tubing or use tubing with clunk?
Hi Marc, all my planes (except for the ones with Cline regulators) have three lines - 2 clunks and 1 vent. No problems whatsoever after violent maneuvers like snaps and waterfall. I have actually tried shaking the tanks (before installation) vigorously to see whether the lines get tangled up - no issue. I do have the brass or aluminum tubes extend slightly more into the tank to prevent tangling or the clunks thrown to the front in rough landings. Good luck !