:lightsabe :lightsabe Hi, we own a 1987 Switzercraft GL-21 powered by a 1995 OMC Closed Deck V-8. It is mounted to the transom on a CMC Stainles Steel Powered Jack Plate. Recently I purchased a 4 blade 27 pitch Renegade prop for it. This thing is a pig comming out of the hole. It was last year too when I had a 3 blade 28 pitch prop on it. When I first purchased the boat it had a Land & Sea cluch prop and hydrofoils bolted to the anti ventilation plate. At this time she seemed to get out of the whole ok. Today with this new prop I had to give it all it had, then a few minute later you could feel the prop spin then grab (a very hard grab), and this would happen a couple of times before finally leveling off.The engine's anti ventilation plate, at it lowest setting with the jack plate is about 1 inch above the bottom of the boat. The motor is equipped with a Land & Sea nose cone with low water pick-ups.Do i need to add a hydrofoil to this thing? And it just seems low on power until the boat levels off, then its get up and go time. Now for the people out there not familiar with a Switzercraft, the hull design is very similar to that of an Allison Boat. Can anyone help me? Thanks, Tom Arambasich. :cry: P.S. I can be reached at Tlord91154@aol.com, again thanks.