I have a little Suzuki 20hp and swapped the stock 3 blade 10p for a Solas Amitas 4 8 pitch. The solas prop either loses grip at about 2k rpm and cavitates, or maybe it's spinning it's hub, if it has a hub? Can anyone confirm whether there's a hub that could be spinning on these little props? As it is at the moment I can get to 5 mph, then it's just the engine getting louder as the prop cavitates or spins and I'm not certain which it is.