Just read an article in power and motoryacht, they claim that mercruiser has severed ties with gm?
I'm trying to find pictures of the Evolution Marine triple outboard 38ft Larry Smith Scarab. The deadrise angle of a Vee hull?s lifting surfaces can have a big influence on the performance of the boat.
A shallow vee design (low deadrise) will generally produce more hull Lift, and consequently, a corresponding increase in ultimate boat speed. The deeper "Vee-bottom? (high deadrise) boat is the most common of present-day hull designs - most manufacturers of performance boats built today use modifications of this design. Vee-Pad Hull - Some "Vee"-bottom boats have a flat surface at the very bottom called a "pad." This pad allows a much more efficient planing surface aft, with an increase in top speed.
Hull designers have used the idea of a flatter planing pad with rounded chine hulls or hard-chined vee design hulls since the early 1900?s.
Howard Pipkorn, founder of Hydrostream performance boats, patented a type of pad-vee design that has typified super-fast vee-hull configurations for the last 3 decades. The reason for the pad-vee design of hull and its relatively recent proliferation is that it really works! The pad is a relatively flat (or perfectly flat) planing surface configured to the aft-most section of a vee shaped hull.
This smooths out the pounding through heavier waves, and helps to more gradually transfer the lifting load to the pad as the hull accelerates. Balancing Act - the high-performance vee-bottom can be a real challenge to drive at high speed. The pad provides a somewhat wider platform on which the hull will ride ? making it easier to balance at higher speeds. All in all, however, the ?pad-walk? is usually infrequent, whereas a vee-hull must constantly ?waver? from side to side.
The hull planing surfaces must always make enough Lift to support the complete weight of the boat.
Less Trim - Because the pad is a more efficient lifting surface, the angle of attack required to generate weight-balancing Lift is less than it would be if the Lift were generated by a higher deadrise vee hull surface.
Setup is important ? particularly weight distribution, because the boat must balance on the pad. Less Drag = More Speed - All the Lift of the hull must counterbalance the total weight of the hull. Here?s How it Works - If we consider the example of a high-performance deep vee hull, we will see how the addition of a pad can increase speed. A 1700lb (total weight) hull with a 20-degree deadrise vee hull design could achieve 90 mph at an angle of attack of approximately 2 degrees. OR?alternatively, as most speed-hungry powerboat enthusiasts would consider, we could take advantage of our full power capability, and turn that efficiency into more speed!


Porpoising and Dynamic stability are also affected by the relationship of all of these forces working together at the various speeds throughout the velocity range. When a high-speed vee hull design is the objective, though, a well-designed vee-pad will usually result in more speed!
A very informative article, thanks for sharing the information Jim and Greg for posting it on S&F. Jim Russell is the best there is and Helmut and I have always been guided by his knowledge and experience. Location: Lakeland Fl USA Stodgy old dude that I am, I never understood why a pontoon boat needs to go fast.
Value in the mind of the customer is how much it costs him to cruise to where he wants to go.
I have always thought that there was a market for a better, more efficient pontoon boat, and if you can produce your hull for somewhere near the price of the aluminum tube ones, you should be able to sell it.
Location: Ontario Not sure about Florida, but there's definitely a market for a faster pontoon boat up in Ontario cottage country.
Location: fl Thanks Matt Our boat will handle 1-3' pretty well,one of our good customers just took his boat from Sarasota to key west,he ran the coast to naples and refueled and shoot across fl bay,it was a 32X 10 tritoon with a 225 merc,he said he cruised at 32 mph,said he was out to the light house every day diving ,he's planning another trip to key west with a trip from key west to fort jefferson in tortougas!
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. The development of new technologies and new materials permits an optimization of the hulls for each application. Work boats have to be stable and have loading capacity, they have to withstand heavy sea’s. The revolutionairy model S&YSHCAT, catamarans with submerged floaters, gives a stability which has never been obtained before.
The propulsion system and engines have to fit in this scope, they have to be high performing and light.
All this can easily be achieved with reinforced plastics, and even more, extreme design can be made for the greater joy of the owners.
The principle of High-Speed Waveless Hovercraft is same as ?High-Speed Waveless Boat?, but wetted surface areas of Waveless Hovercraft is about 10% of normal boats. Originally Posted by waveless High-Speed Waveless Hovercraft is different to the normal hovercraft, the air at the bottom of the hull is never leak out from the hull. Another problem is the hole in the water below that would form when the pressure reaches certain level. Location: Amsterdam How can a solid body touch the surface and not make waves? In waveless boat, you say the resistance will be biger, because the wetted surface areas is 3 times than the conventional vessel.
I was work in a research institute for many years, you do not need to tell me how to write a discourse.


We found this wild old school hot rod ski boat on eBay, built in 1965 this was a turnkey speed boat offer by Hallett. It’s the engine that powered the Shelby Cobra and it has found its way under the hood of most body styles that Ford produced like Galaxies, the notorious Thunderbolts, Fairlanes and was even available in wagons and sedans as special order. As you can see this boat has been kept in amazing condition for its age, and we have to wonder if the present economy has thrown caution to the wind, because as the auction nears closing it has yet to receive a bid. I've been playing with a Hydrostream Valero Vee pad trying to as much as possible on a limited budget. Performing boats can save crew out off dangerous situations where heavy boats can’t get away in time.
If I'm reading it correctly it will act as a big water catcher and drag brake or at best a second bow with double the resistance of a single bow. Number one is waves over water - the impact is unforgiving on a hard hull unless you slice through the water or plane over it. That is unless a tail wind makes the front dig in, or a side wind causes one side to make contact and spin you around like a top or worse. Again you seem to be making claims for performance that you are unwilling to substantiate, either mathematically, or experimentally.
If you require further details regarding the transaction data, please contact the supplier directly. Just knowing the history of the engine and the era when this boat was built, we know it had to be a pretty expensive toy even back then. It is pleasing to learn that you are building these boats with a design concept different from the woefully inefficient round aluminum tubes. For an idea like this to work, you would have to have ultra light boat to benefit from air pressure under the hull. PIERRE AND MIQUE SUDAN SURINAME SVALBARD AND JAN MAY SWAZILAND SWEDEN SWITZERLAND SYRIAN ARAB REPUBLIC TAIWAN, REPUBLIC OF TAJIKISTAN TANZANIA, UNITED REP THAILAND TOGO TOKELAU TONGA TRINIDAD AND TOBAGO TUNISIA TURKEY TURKMENISTAN TURKS AND CAICOS ISL TUVALU UGANDA UKRAINE UNITED ARAB EMIRATES UNITED KINGDOM UNITED STATES UNITED STATES MINOR URUGUAY UZBEKISTAN VANUATU VATICAN CITY STATE ( VENEZUELA VIET NAM VIRGIN ISLANDS (BRIT VIRGIN ISLANDS (U.S.
It also won the 1964 Super Stock Title in NHRA, in all its variations from Low-, Medium-, and the High-Riser versions, the 427 FE engine has set records in numerous forms of competition.
ASSEMBLY INSTRUCTIONS 12455 Click to write a caption for this image.Copyright 2010 Ceasar Infatable Boats,A US. Your boat's nose will also generate a lot of waves by simply pushing the water in front of it (sea is not flat.



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