I've been reading posts for days now and am getting close to a new prop. 08 supra 22ssv with 340 motor. Run about 1600#'s boarding and a little more to surf. Usually 6 people too. The elevation where we boat is 5000' I run a weird size OJ prop. It's 13.75x15.5 and I think a .090 cup. I get good rpm empty (5000). My prop runs like a raped ape at 800' but needs a little more here. Top speed empty is 40. nettles thinks a 1847 would work jim at acme thinks a 1433 would work.