1996 lund tyee 1850, 4.3lx. first prop was SS 21p 3blade, got 4800 rpm and 47 mph. slight bog at takeoff. second prop is SS21p 4 blade- 47 mph @ 5000 rpm( maybe able to go a touch higher, but didnt) much better hole shot, no bog. 3rd prop was SS 23p 3 blade, 47mph at 4400 rpm, then cavitated...