This design innovation is the primary reason why Intrepid’s stepped hulls turn and maneuver so effortlessly. In light of rapid population growth and the inevitable overcrowding of cities, a British company known as WaterSpace has put together a design that turns houseboats into stylish and environmentally conscious studio apartments.
With WaterSpace’s Floating Studio Flat design, each boat will function as a one bedroom apartment equipped with bathroom, kitchen, and bedroom. While the Floating Studio Flat is currently little more than a concept design, WaterSpace estimates that each boat would cost around 80,000 UK Pounds (roughly $128,000).
Would this vessel have to be a hydrofoil or multihull, or could a monohull with a hinged transom of sorts convert a double ended full displacement hull to a squared off planing hull? Location: Australia Displacement-type cats probably the most likely candidate for a boat that can operate efficiently over a wide speed range. Location: Australia If such things were easy, or practicable, or affordable, they would have arrived on the scene by now.
Location: NW Washington State USA One way to do it would be to hull a bit like a Handy Billy that at a bit less than hull speed would have her transom out of the water and present an excellent full disp hull form to the water.
Location: Sweden As far as I've understood there isn't really a maximum (displacement) speed for long and narrow hulls.
The performance of any boat, and especially a multihull, goes out the window if you overload it. Location: Everson, WA From the thread, I am leaning t'ward a catamaran with hyper narrow, deep hulls.
Location: Australia There is no miracle design that will do everything better than all others. The subject of efficient power boats interests me, especially in the 10 ? 20 knots speed range. If fuel efficiency is the only criteria and length is not a restriction, a long and narrow monohull is the answer. A conventional trimaran has stabilizing amas that extend outside the sides of the hull proper. Another variant on the stabilised monohull theme is the displacement glider, also called box keel boat. When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Where Intrepid differs is in its forward panel, which is at a steeper longitudinal angle along the keel than the aft panel. Living in a decked out home like this, you might even forget that your home is floating on water. The top level of the boat will even be made into a sun deck for those who would like nothing more to sit and relax.

Of course the final price would depend on the added features, energy systems, and interior furnishings. I've seen the HYSUCATs, and would like to get feedback on a trimaran (HYSUTRI?), or another hull design.
Transom extensions might make some theoretical sense, but in practical usage, transitioning from one mode to the other, on water, would likely be problematical.
But because of her rockered bottom w more power she'd pitch up, squat a bit and have a submerged shape much more like a planing hull and go gracefully at speeds much higher than disp. I guess that this is because it is easier to make a practical boat with a catamaran hull than with a trimaran hull.
Ultra narrow catamaran hulls might be attractive for their minimal wave-making resistance, but cause hobby-horsing running into a sea, as well as being very sensitive to fore-and-aft weight distribution. I estimate that the boat that fits my requirements has a displacement around 4 tons, so I?m looking at long and narrow hulls used in displacement mode.
The platform connecting the two hulls needs a clearance of half a meter or more to the water, to avoid waves slapping into the platform.
This arrangement complicates handling in harbours so I?ve ruled out a conventional trimaran for myself. The box keel provide maybe 80% of the buoyancy, provide standing height in the forward cabin and can accommodate engine, fuel, water and technical installations. My hope is that such a boat can be made in the spirit of the beautiful power boats designed by CG Pettersson during the first half of the 20th century. Aboard many other stepped hulls, which are running flat or slightly bow-down to begin with, this is a skittish situation because the bow can actually dig in and break the back end of the boat loose. The WaterSpace team has created the initial layout of each boat, but they really want to customers to take an active role in the final design of their floating home. Maybe someday soon there will be a real market for these home, but I don’t see many people docking their homes along the Manhattan waterfront just yet. A tri could cruise on a small diesel in the center hull and have big block chevrolets with jet drives in the outer hulls. Hydrofoils sound great, until one hits anything more solid than a duck and somersaults into oblivion. Gracefully that is excluding the fact that her bow would be ungracefully high in the air, subject to winds that could make a mess of directional stability.
From boat data I've seen, and my own calculations using Michlet, long and narrow hulls are used at speeds up to around 20 knots for a 12 m long boat.
I wouldn't count out a mono-hull Tlinget or Otter types either (people in the Northwest will know what I'm talking about).
If you also want a useful boat, a monohull has to be considerably longer than 12 m to provide an acceptable beam.

Anything you build on the platform will have quite a high CoG so you will need a minimum total beam for the catamaran of 3 m - 4 m for stability and to avoid excessive wave interference between the hulls.
The clearance to the water for the hull spanning the distance between the main hull and amas still needs to be around half a meter with resulting high CoG. Add-on options include solar panels and a wind generator to provide power to all the boat’s electronic energy needs.
The idea would be to waddle along at single digit speeds for maximum range, then roar over the horizon when the Somali pirates show up.
First hand experience with a planing hull at displacement speeds proved to me that just pulling back the throttles does not save much, if any, fuel. Michlet is based on theories for wavemaking that is applicable for long and thin displacement hulls and consequently is most relevant when wavemaking is the major resistance component. My search is for the hull(s) design that goes the fastest with the least power, then I can work on a compromise of accommodations, tankage, complexity, initial cost vs long term cost, etc. For adequate initial stability, the total beam needs to be more than 3.5 m for a 12 m long boat.
Our tulip-shaped (convex or flam) bow entry adds buoyancy, and further complements the efficient lift and good handling properties of the step. The creators assert that these renewable energy sources should make the boat energy self-sufficient. If you go for planing multihulls you will sacrifice efficiency at low speed for a higher top speed, but the low speed efficiency might be adequate for your needs anyway. The data LWL = 20 m, BWL = 2 m, draft = 0.5 m, displacement 12 tons approximately describes the minimum useful displacement for a monohull (for speeds around 15 knots). A trimaran would have room for an engine in each hull, max range in the center engine, max speed with all 3 engines, and something in between on 2. It sounds good until factoring prismatic coefficients (and other formulas naval engineers have a total grasp on) for different speeds. A wise man once said the most efficient way to go through the water is not to go through the water, but the air instead, with as little of the boat in the water as possible. I have had a bit of change of thinking about this recently, and will shortly be testing a new idea via some scale models, if it's got legs I'll post some news. The boat I have experimented with is unfortunately a bit too heavy to get a good response from, with the air cavity size it has.

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