Location: Amsterdam High-Speed Waveless Boat (save 50% energy!) If a boat is running at high speed in a river, it will produce huge wave and disturbed the tranquility of the shore.
Here is my design (Fig.3), the screw propeller of waveless boat is fixed at the front of the boat, when the boat is running, the screw pulls the water into the duct that covered at bottom of the boat, and pushes the water through the duct.
If the current boat has 100 horsepower (see Fig.1), and running at high speed, the front resistance is about 80 horsepower, the tail resistance is 10 horsepower and the frictional resistance is 10 horsepower. Location: Amsterdam She is my dream She is my dream, do not say he please! Location: netherlands waves disturbing the shore are hullspeed displacement waves, once on plane a speed boat makes little waves. Location: Amsterdam waves disturbing the shore are hullspeed displacement waves, once on plane a speed boat makes little waves. Location: Michigan To limit water surface disturbance you must limit surface contact area. Submerged foils of a Hydrofoil may do this, but not as well as a SES (surface Effect Ship) or Hovercraft. Location: Florida Waveless Boats People have been building waveless boats for years.
Location: Amsterdam All these craft lift the body out of the water in all or in part. Originally Posted by waveless All these craft lift the body out of the water in all or in part. I also have designed a high-speed submarine that is like a dolphin, the dolphin submarine can flying on the surface of the water, and dive into the water.
Hull coefficient » Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Search this Thread Advanced Search Similar Threads Thread Thread Starter Forum Replies Last Post Are we making any real design improvements?? When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. A Mercedes Benz Blue-Hybrid Tender that demonstrates to the boating community how it can reduce “Global Warming Pollution” by 280 million metric tons per year. The Carbon Fibre Guardian S Class is a is 45 knot Solar Hybrid Vessel powered by an EPA car regulated Mercedes Benz Bluetec engine coupled to a Carbon-Grossbauteile electric motor. The Guardian’s Lithium ion UPS provides a Zero Carbon cruising range of up to 50 nautical miles while her plug-in SunPower array generates enough free energy to motor Carbon Neutral for up to 1,000 nautical miles a year. Richard Sauter head of design comments “Taking advantage of existing advances in Green Technology, the Guardian S Class leads the way in attacking one of the major causes of global warming and in doing so lays the foundation for the only marketing force likely to revitalize the boating industry in the face of ever increasing fuel prices ”. While many look to revitalizing inland waterways, doing so without regulating the inevitable increase in pollution that will come as a result, will not benefit the related communities. The EPA estimates that registered recreational boats in the USA alone produce a staggering 375 million metric tons of Co2 per year. It will be interesting to see what green superyachts of the future will have a Carbon Fibre Guardian S Class tender as part of their water sport toys and amenities available for personal use and charter guests.
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Powerboat designers are giving their maximum effort to develop something the will offer an extraordinary look as well as speed and power. Rather than resorting to personal attacks and implying I am a liar, I suggest that you go look at a tracked machine, whether it be a crawler tractor (CAT), or a tank, for an example of a prime mover driving two final drives. BTW, I am not trying to be argumentative, but I respectfully suggest that you are not reading the intended meaning of my words.

I believe one large potential benefit not mentioned in the above posts, would be the possibility of eliminating rudders and the associated appendage drag. One engine driving two final drives has been used for years, just not in mainstream marine propulsion applications.. Furthermore, I've mentioned the Yellow Fin drive system, and provided a link to video of the FastTrack amphibian.. I would suggest that having precise control of the relative thrust from the two prop shafts is necessary for differential steering - this can be accomplished by several means, one of which could be twin CVTs, another is twin CPPs, a third way would be a twin engine set-up with closed loop control of the engine(s) speed. The FastTrack video shows differential steering - it could be done in a similar fashion if the final drives were propellers instead of tracks.. 2) With any variable drive system, it then becomes possible to load the engine for better engine efficiency in normal operating ranges. 3) With two CVTs, (or CPPs), it then becomes possible to differential steer the craft at speed. 4) With CVTs and fixed props (compared to CPPs), the propeller efficiency is potentially better across the full range of speed, and surfacing drives are a possibility. 1) Most designs being developed for automobile use do not use the mechanism to reverse - a separate gear change occurs.
2) The CVT technology is currently not mature, and has not been applied to marine applications.
As an additional note, I suspect that the torque impulses from surfacing propellers would quickly destroy existing CVTs. But, in the interest of moving the thread along, let's say the application has two Power-Vent like surface drives, counter-rotating props with a single engine, and a CVT driving each prop shaft. I suspect that there may be challenges steering such craft when in displacement mode, without rudders, but could you please explain why such a "differential steering" drive system, as I've spelled out above, cannot work in such a craft at cruising speed?
But apart from all those, partly sophisticed, partly more theoretical solutions, if we brake it down to the first question, then I still see absolutely no benefit in such a installation.
Have your main run a hydraulic pump and have this in turn driving a hydraulic motor on each shaft. Engine can be located anywhere you like, and can be mounted at any angle to the longtitudinal plane. The technology is already out there, is cheap, and is operating under severe service conditions on extended service intervals.
Originally Posted by Rick Willoughby The majority of boats are draft constrained meaning the props are smaller diameter than that required to give best efficiency. When prop diameters are constrained by draft there is some benefit in splitting the installed power between two props of similar or larger diameter than a single prop installed on the centreline. Taking an example of a 26 x 16 prop running at 1500rpm and pushing 10000N at 10kts the efficiency is 60%. Until I spent the effort to understand propeller physics I thought there were fundamental efficiency based reasons for the difference in shape between airplane props and boat props. When you understand the physics you would always go for high aspect blades and low velocity ratios if you wanted efficiency and this was the only requirement. I even have higher aspect, around 15% area ratio, and can get high eighties efficiency with low speed operation around 6 to 7 knots. From what I have seen there are not many people building boats versed in prop design from fundamental physics. The pleasure boat market has not been overly concerned about efficiency up till a couple of years ago. The practical problem with using such propellers is the draft required to swing the required prop diameter.

Location: hawaii, usa The concept of two shafts from one engine makes sense on boats where draft and manueveribility are issues. A west Florida builder (was it Dolphin?) turned out plenty of these on a nice 40' lobster hull.
Kiko Villalon's IBEX Pro Boat 34 is set up this way, and I'm sure he's not just blowing smoke at us. Location: hawaii, usa OK, the coffee's kickin in, the builder's name was Dorado, not Dolphin. Gozzo boats » Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Search this Thread Advanced Search Similar Threads Thread Thread Starter Forum Replies Last Post Convert Twins To Single Engine? By the way, interesting idea you have - looks like a flow tunnel but not quite as efficient as a ducted propeller feed.
The fexible skirts may come in contact with waves, but they give in, the full impact of a hard hull does not take place. When combined with other currently available technology her Fuel Consumption and GHG Emissions are 50 to 100% lower than any speed boat ever built. By employing catalytic dry exhaust systems, Solar Hybrid power boats like the Guardian S Class are actively protecting rather than contaminating marine bio-systems. Carbon Neutral power boats that follow the Guardian’s example can reduce that figure, by on average 75%, thereby reducing “global warming pollution” by 280 million metric tons per year. We have crewed charter boats in the favourite yachting hotspots in the Mediterranean and Caribbean as well as worldwide locations. The Supersnake powerboat is such an attempt that is made of aggregated diamond nanorods and carbon fiber. A twin engine CPP arrangement is for shure not more expensive but very efficient, reliable and off the shelve.
Not only are draft restrictions an issue but most boats aren't prop matched to their employment.
The aweless boat can run at high speed without wave, it can save 50% energy or increase 50% speed. The craft tends to flatten out any wake with an area or curtain of pressurized air captured under the craft. Both of these items would allow the vessel to operate at significantly increased efficiencies. The minor disadvantage of the wider weight distribution (dreamer made that a issue) one can almost forget, I think.
The life of a walk motor between overhauls is about 6000 hours, and they aren't hard to overhaul. The faster a hovercraft goes the less time the pressure is over one area, the less the wake. Lotusan based color paint is used to keep the boat clean and lessen the friction to its minimum level. Boat lovers will surely like the lucrative design and the power of a V8 engine that is able to produce remarkable speed.

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