mike lewis

Thank you for that info grahoon. I'm going to leave them an e-mail.

Has anyone heard of these new props or got one of these new props? About three weeks ago I watched a guy stop his boat on a six pence! I want one!!!! I think he called it an Axiom propeller, but my hearing not so good anymore.

Daniel, you have a steam boat, with slow rpm ? The slump / squat on my boat at normal rpm is 4in and 7-8in at full rpm ( not that I use full rpm , much ! ) The engine is a 34 hp prm gearbox 2:1 reduction turning a 16in dia screw 12 in pitch. Maybe the answer is a 3:1 reduction gearbox and a bigger screw ?

She sits quite flat when moored, i've taken real care when ballasting the boat. I know what your getting at and it would have never been taken as a criticism. Everybody has been fantastic with there help on this topic. I thank you to all.

I understand all of that, but. If the air is causing the problem. Why haven't boat designers put 'skirts' around the sides of the swim? To prevent air being dragged by the prop.

Yes, we have notice that the underside of the swim is visible and there are lots of bubbles in the water coming out of the propeller. I'm getting a bad back moving all this ballast around, to try and cure what i now know is called slump.

Gary, I think your right. But why is the propeller digging a hole???? We have notice this and we do back off the throttle. But the underling problem is that the stern digs in. It must be related to the propeller. Because when we broke down once and were towed the stern did not dig in.

Its good to know its not just my boat. This happens to every craft! large or small.

Why is it that when my boat is going forward, the stern digs in? The more power i put on, the more the stern digs in. It dam near covers my stern button! My boat is 48 ft with a normal swim and propeller. Is this just happening to me? We have tried putting more weight in the front, but that didn't make much difference. Would a bow like a 'super tanker' stop the stern from digging itself a hole? There must be a name for this. Even at low speeds, it feels like the boat is dragging the bottom. Help!!!!