Jib sheet - lose the specified line (5/16" Spun Braid x 32') and switch to the new-fangled Robbline or Salsa or similar, and at 7 mm. Easier on the hands, rungs through the blocks quicker, does not get tangled, floats on water, and the colours are better. The usual problem is that folks oversize their sheets....try 7 mm. Clean, then lube the jib blocks with silicone spray. If they still bind, replace them. Also, try adding pigtails, I think I emailed you some pictures.
Main sail track. Gently lay the boat on its side....(on grass or soft sand). Clean out the mainsail track. Often, during a turtle, mud will get caught in the top of the mast area. Look to see if there is damage to the track.... then lube the track. As you raise the main sail, keep head to wind. If the wind is swirling and the sail moves as little as 20 degrees off centre, the main will 'bind' in the track. If your H18 came with a 'sail feeder', I suggest you remove it. More problems than it is worth. Is someone helping you with the main as you raise? Are they feeding while you pull? It sounds like you are working too hard, and will end up breaking something.
Harmonic vibration - that is the famous 'rudder hum', much written about that on the Forum, you need a pair of scissors and about 3 minutes....look it up. It also means you are traveling at a fair speed - well done. Yes, they do sail like a Cadillac drives....
_________________ 2015 H16, with spin, SOLD 1989 Hobie SX18 Sail # 1947 "In Theory..." 'Only two things are infinite, the universe, and human stupidity. But I'm not sure about the former.'
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