Hi Scott - I'm not familiar with these turbine pumps of which you write. Can you offer a link? It sounds like you'd have to be underway (prop shaft turning) for this to work - is that right? Most commercial boats have a positive-displacement main engine-driven bilge pump and that's been my preference. Ours is a 1-1/2" Jabsco belted to the front pulley. It has an electric clutch actuated by a pneumatic bilge level switch; the switch can also be engaged manually. It is normally lined up to take a suction on the engine room bilge but can also be lined up on the V-berth bilge - that's a watertight compartment on our boat. That forward compartment has an audible and visual alarm at the helm. The downside of a non-positive-displacement pump of course is that they are not self-priming and therefore not very good at pumping bilges unless submerged. In addition to a Rule 3700 submersible and a Jabsco diaphragm pump, our main engine's raw water pump (Jabsco) is also capable of de-watering the ER bilge. As if that weren't enough, we also have the mandatory Armstrong-powered Whale Gusher. Regards, John "Seahorse" > Another thing to attach to the shaft is a turbine style pump and shroud that will evacuate the water from a flooding bilge. I believe these are very cost effective and as long as the engine is making RPM's it will move a tremendous amount of water out of a hull. I've heard the only downside is a whirring noise that's always present as the turbine blades spin in the open cavity. **************The year's hottest artists on the red carpet at the Grammy Awards. Go to AOL Music. (http://music.aol.com/grammys?NCID=aolcmp00300000002565)