Recent content by Yamaharacerx

I guess, I know it works. It is proven but I don't agree with his interpretation of why it works. I do not agree that is trapping the water. I do not see it as adding to the weight of the boat, thus lowering the VCG. I see it as adding additional surface area that push's against the water.

The problem with the Mac is that the water drains through a valve, if you were to punch the throttle you would still have weight in the ballast as water flowed out of the valve. How ever long that takes. The tunnel concept would allow an almost instant response. Here is a similar system...

If you can do it with the hull of the boat, it becomes passive. Who wants to keep a stability anchor on boats that you have to worry about putting over the side of the boat and then pulling back in. With that said do you think he is thinking about it correctly, is it "trapping" the water. Or...

Understood, but is there a difference between the two pictures above where one has a plate on the bottom of the tunnel and the other doesn't. Well if placed correctly, you can reduce the friction of the hull on water but getting them positioned where when on plane the tunnels are out of the water.

Sorry one other note to answer the mail about why we don't close the tunnels. This is a planning craft boat like a speed boat. So any water added as ballast weight will reduce the speed of the boat.

Thanks Dave, But the MacGregor system works by pulling a plug on the transom and letting the ballast tank fill with water. Then you put the plug back in when you have filled the tank. Basically filling a contained tank inside the boat with seawater, and since this added weight is below the...

Thank Jack, That makes sense to me. So now what if we look at a situation where we have a boat with tunnels vs. a boat with tunnels but the tunnels are "capped" at the bottom. So when sitting still in the water both tunnels are filled with water. Now when you heel to the port or starboard...

So I go into a debate this morning with a co-worker about a boat hull design. He is stating that if we create tunnels in the bottom of the boat that run longitudinally and are capped on the bottom but open on the ends they will trap water and act like ballast tanks thus adding stability when...