All engineered crafts are mental and physical compromises of what a skilled man can do, both from the structural engineering side and the operational side. The engineer who designed, chose the materials, and built that boat, knew exactly what was needed for him to continuously save the lives of the crew, both in calm and stormy conditions and the same applies to aircraft /car/bridges/domestic/industrial/medical/surgical/ art, military, religious, etc engineering. The ship's master does not seem to be conversant with the PID control ( and acceleration control) we use in automatic control engineering and is letting the craft oscillate continuously with marginal stability with the wave using only positional feedback to the rudder which is rather a delayed control system. If he used derivative feedback he could have kept that craft going straight but would impose greater pressures on the rudder. He is a wise person. I feel that the boat is a little overloaded with not too much reserve buoyancy. It is well designed to control the broaching action/reaction, and the buoyancy at the transom has less buoyancy compared with that at the bows which seem to be ample to stop the nose digging and build up lateral resistance, which is something one does not want when navigating in a flowing sea as shown in this video. The use of the scuppers in such a situation is imperative not to build too much water on deck. I think that I would have raised the working deck a little higher but retaining the self-righting action of such boats. What we see in this video is great teamwork by engineers and shipmasters. The scuppers could have a flapper to act as one-way valves. There is not much, operational pilots and shipmasters, and many other modern professions, including the religions, philosophies, artists, medical field, the law, domestic and industrial work, Armies, Navies, Airforces, politics, can do without the intelligence and guaranteed working products of engineers. There are not many service and vociferous professions which guarantee their work as engineers do. If any operator exceeds the structural and operational integrity of what engineers provide for them, there is nothing much they can do on their own apart from...........praying. Many people are proud to be able to buy and own and operate what engineers build. One must look at engineers as being the profession that provides handicapped people with all sort of prostheses for those with missing abilities as pilots without wings, sea masters without flutes who cannot cross oceans on their own, X- rays and MRI and ventilators and surgical tools for the medical field and all that comfortable devices we find in and outside our home. Most modern people are born handicapped in that they cannot do what they want under their own steam and so they need engineering prostheses to be able to do it. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-aMknOn_871U.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-3jA0CscY1YU.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-0bA0NAEqPcQ.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--Yr4ZIc47Pw.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Kzxf3n3KxXM.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-BEZMaTKRPVU.html MIsuse of engineering............ ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-y4Xs_G9tdSw.html
With the displacement he was making, I doubt his engines have the grunt to do what you're talking about. Semi-displacing hulls, such as cruisers, may be able to do that, but not a full displacement boat like that. You can see both the hull form and engine operation in the bow wave throughout the clip - all that water pushing vertical is the displacement of water around the hull. You can't surge power on a vessel that displaces like that - not in the sense of cruising between the waves. All a displacement hull skipper can do is maintain angles, like he did in this clip. And you can see from the stern motion that the forces that skipper was fighting were enormous, yet the boat never left base course (sure it was yawing, but that skippers excellent seamanship and coxn abilities were amply demonstrated that he maintained the course even with the yawing)!
That boat looks loaded. And what is more she is loaded at the back so that the back coming waves will not broach her. She did well, but really that sea is not so bad.
Oh yes it is and it is often exponentially worse. The under current on that bar is treacherous. Add into that the changing tide and high river water and yet shallow bar, things can get out of control very quickly. This footage shows just how an experienced skipper can make crossing that dangerous water look easy. It isn't. I've been across it.
Ebb tide? Flood? Looking at the shore the tide looked high/slack. Google Maps shows the harbor is the mouth of a river. The Greymouth River? River mouths are always a tricky passage. The bar is created by silt settling out of the river. The shallows push up the ocean swells into formidable waves sometimes, depending on the strength of the current.The Columbia River bar in Oregon is notorious. Outside the Golden Gate in San Francisco is a bar called the Potato Patch. Small craft are advised to stay out of it at all times.
At this time the Grey river was in flood and the fishing boats can only go in or out to the Greymouth Port at high tide or in coming tides as its shallow ,but with the river being in flood makes it very dangerous coming in or out with the flooded Grey river coming down pushing against the incoming tide, the Bar has taken many lives and boats over the years.
they are also pushing into the flooded Greymouth River which forms part of the harbor mouth.which is also flowing into the sea and pushing against the incoming tide.
Looks almost as though he throttles up when the stern is lifted by a wave, and then throttles back, perhaps even put the trans in N as the stern settles in a trough. To protect the prop perhaps? Boat makes very little headway when in the trough, almost none in fact. And then pushes a lot when surfing. Nicely done. Love to know how much water is under his keel in those troughs.
@@ysesq, the Bar is shallow and the boats can only come in or out on incoming and high tides. with the Grey River in flood pushing against the incoming tide can make it quite dangerous and the Bar has taken many boats and lives over the years.
I took the videos and photos, I am the copyright owner of my photos and my videos.unless he was paying me to take the photos or videos for him,then he has nothing really to do with it.
Not hard at all! Try doing that with a Sygmond Hull loaded to the 7th barrel berm! Then you know a thing or two. This was Chetsmith markum** Easy as a Sunday milk bath! You don’t know mate, and don’t try to ply my waterline dry.
That is dangerous she's a half decker one of them waves could fill her you'd need good working pumps on board anyway.And a few paling buckets for back up.
Quite frankly I think the boat would have handled better if the captain had given her a bit more throttle. Wallowing in the waves tends to lead to less directional stability whereas maintaining the same speed of the wave can keep you out of the trough and more directional stable. Admittedly there is a fine line between too fast and too slow but I think he erred a bit on the too slow side?
