Rêvo specialises in designing and building jet boats.
From small river boats with jet ski engines and running gear to 9 metre ocean going jet boats to commercial workboats with jet propulsion, jet boats are an area of specialised expertise we pride ourselves in.
We particularly specialise in sea-going jet boats and believe that a well designed jet boat is unbeatable.
I believe everyone who claims to be a boat designer should have to design a jet boat. Jet drive will expose any flaw in a design. There is no leg or rudder to artificially compensate for poor design. These days there are trim nozzles on some units which can be used to alter trim in an attempt to bypass poor design. None of my jet boats require trim nozzles! This is why they have better handling, better ride and better speed than any other jet boat.
With the right design the choice of jet will be a decision you will be very happy with at sea.
We particularly specialise in sea-going jet boats and believe that a well designed jet boat is unbeatable.
I believe everyone who claims to be a boat designer should have to design a jet boat. Jet drive will expose any flaw in a design. There is no leg or rudder to artificially compensate for poor design. These days there are trim nozzles on some units which can be used to alter trim in an attempt to bypass poor design. None of my jet boats require trim nozzles! This is why they have better handling, better ride and better speed than any other jet boat.
With the right design the choice of jet will be a decision you will be very happy with at sea.
Understanding jet boat design.
Ask yourself what does a good jet boat do. The most common answer is they run in shallow water. Correct. But how much water do they need to get running. This is a question that jet boat owners and enthusiasts never think about. So I have attached a short clip here made up of still shots. The first boat is a beautifully built boat that the builders market heavily on the way the boat takes off as a major selling point. And people buy the boat because of this. The second boat is a Boxta 45. By using the still shots we can show how the boat sits in the water and emphasise the hulls characteristics. Sometimes missed at full speed.
You will notice the massive trim angles the first boat takes on to get planing. The power of the engine and jet are able to overcome these massive trim angles and thrust the boat up over the bow wave where it launches into the air. Thereafter it crashes down into the water before bouncing out again. This is repeated until the boat reaches a planing equilibrium. The still shots reveal how much of the hull is submerged while it goes through this transition. This is not obvious when viewed at full speed. You will notice the Boxta 45 does not take on those extreme trim angles and therefore does not submerge the back of the hull as deeply. In fact the Boxta 45 which runs the same horsepower and similar sized jet submerges one half to one third as much as the other boat (or any typical modern jet boat as they pretty much all behave the same way. They are merely clones of one another)
The implications go further than the depth of water required to get the boat planing. The boats have to be fully planing to reduce running draft. The Boxta is fully planing almost immediately and at a very low speed. The other boat due to the extreme trim angles is planing at a much higher speed. Full planing speed is the point at which the bow starts to come down from its maximum trim angle. The higher the trim angle the higher the full planing speed.
Now imagine going down a fast flowing river full of rocks. The faster you go down that river the less time you have to make decisions. The slower the full planing speed of the boat the more time you have to make those critical decisions. Also think about the trim angles. If you are coming down a river and need to slow down to have a look or buy yourself some time, would you rather be in a boat that sinks down by the stern with massive trim angles (in the video the angles are so high the helmsman cant even see over the bow and the draft or depth of hull is a lot so requires deeper water) or in a boat that sinks its stern very little and does not take on extreme trim angles and is therefore able to plane down the river at a much slower speed. Also note how the Boxta can accelerate very quickly and effortlessly without extreme trim. There is no bouncing so she is instantly at the required speed.
At the end of each clip is a shot showing the wake coming off each boat. Note how clean and well aft the water breaks from the Boxta hull as compared to the other boat which almost pushes the water out forward of the hull. But that is another story I will explain later!
That is the first Boxta advantage. I will discuss more advantages in future articles.
The implications go further than the depth of water required to get the boat planing. The boats have to be fully planing to reduce running draft. The Boxta is fully planing almost immediately and at a very low speed. The other boat due to the extreme trim angles is planing at a much higher speed. Full planing speed is the point at which the bow starts to come down from its maximum trim angle. The higher the trim angle the higher the full planing speed.
Now imagine going down a fast flowing river full of rocks. The faster you go down that river the less time you have to make decisions. The slower the full planing speed of the boat the more time you have to make those critical decisions. Also think about the trim angles. If you are coming down a river and need to slow down to have a look or buy yourself some time, would you rather be in a boat that sinks down by the stern with massive trim angles (in the video the angles are so high the helmsman cant even see over the bow and the draft or depth of hull is a lot so requires deeper water) or in a boat that sinks its stern very little and does not take on extreme trim angles and is therefore able to plane down the river at a much slower speed. Also note how the Boxta can accelerate very quickly and effortlessly without extreme trim. There is no bouncing so she is instantly at the required speed.
At the end of each clip is a shot showing the wake coming off each boat. Note how clean and well aft the water breaks from the Boxta hull as compared to the other boat which almost pushes the water out forward of the hull. But that is another story I will explain later!
That is the first Boxta advantage. I will discuss more advantages in future articles.
Rêvo Boxta 45Rêvo Boxta 45.
4-5 seat Non Reinforced Plastic (NRP) jet boat. The big strong silent type. Commissioned by an owner of the smaller Boxta who said "the boat is so good I don't want to boat in anything else now". But he did want to be able to take family and friends aboard so commissioned the Boxta 45. Here is what the owner Bill Winmill said about the boat:- The boat is so smooth and quiet and handles rough water so gently without banging. Performance and handling are superb. So responsive. She planes so quickly and at such a low speed. Coming down river is very safe. You have so much control. She just goes where you point her. Handling is superb. Can't believe how easy it was to get the boat back to water. It slid very easily unlike an alloy boat. But what amazed me most was how it required so little water to get it planing. It hrdly needs any more water than it takes to float the hull to get it planing and it floats in less than 300mm of water. About a half to one third of other boats this size. It is one tough boat. We ran it 40 metres high and dry. No damage at all. We have had some massive hits fully loaded at speed and not compromised the hull. She is one tough boat The boat is so easy to work on for maintenance. The full engine bay and cover is brilliant. There is so much open space all around the engine and jet so getting access to all parts is very easy. And it provides good storage space for gear when on a weekend camp. I couldn't be any happier. She is perfect. Fully fabricated Polyethylene hull professionally designed/engineered and professionally built using new technology for an even better stronger boat and more dimensionally accurate accurate hull shape. Chevy L86 alloy V8 Scott 852 water jet. This unit is fitted with a trim nozzle but the owner does not use it. He does not need to alter the trim at any speed. It is all set by the superior design which increases efficiency and improves handling making the boat faster and safer. Using trim to alter trim angles is wasting horsepower and ultimately will not make the boat safe. The ride angles must be set by the design for safe efficient handling. No chine walking at speed in this boat! 125 Km/Hr top speed. The final part of the design process is validation. Checking how the boat performs compared to the design predictions. This is more than just speed it includes ride angle and ride heights. This verifies my formulas are correct so is a vital part of the design process. The video here is part of that evaluation process. As you watch the Wairaurahiri video, pay attention to the engine revs. This is New Zealands fastest flowing river. The Boxta 45 is cruising down at barely above idle. At times Bill comes completely off the accelerator but the boat does not squat. It maintains planing and trim at very low speed. Then notice when the power is applied the boat just accelerates without taking on great trim angles. This is what gives the driver so much control coming down river, where being able to operate at the lowest possible speed is a huge advantage. Also note there is no noise. The boat does not bang and pound or club the water like most jet boats. I call those kinds of jet boats clubbers. They club the water, BANG BANG BANG! And you can tell how quiet the boat is by the normal conversations they have on the journey. Not having to yell and bear in mind the engine box is not even enclosed. And she hits a few rocks on the way down. But suffers no damage at all. Even that impact is reduces by the ability of the plastic hull to absorb and dissipate shock loads. The ride is a cruise. Very enjoyable! Also note that there are no strakes on the hull, yet the the boat does not slide around. As the owner says, "she just goes where you point her". A big advantage going down a river that flows as fast as this. |
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Rêvo Boxta 45
This boat was commisioned by the owner of the Rêvo Boxta. He loved the boat so much he said "I just don't want to boat in anything else now". But he did want a bigger boat to take his family so was born the Boxta 45, a 4-5 seat version of the Smaller Boxta. He wanted the same style with the plumb bow but motor was an all alloy 6.2 litre Chevy L86 V8 with a a Scott 852 waterjet. I did a lot of work on this design as the speed she is capable of is breath taking so everything had to be right. Once again built of non-reinforced plastic (NRP). Once again he would not build a boat in anything else now after having the NRP Boxta. Jet unit is in and motor not far away so will keep you posted. The owner is very excited. His words, "I love it, I can't take my eyes off the fucking thing"
He believes he could boat DOWN the hidden Falls Rapids in this boat as the boat will fully plane at such a low speed but give instant and easy aceleration when needed and the plumb bow keeps the boat buoyant helping maintain precise control in all circumstances. |
Rêvo BoxtaBreaking new ground!
This little boat is a complete break away from jet boat tradition. NRP (non reinforced plastic) fabrication, plastic trailer and a completely new high performance hull design. More efficient Safer handling Tougher, stronger, more durable hull Smoother and quiter. To prove it just watch this video of Boxta going up the Hidden Falls Rapid in low flow, thought to be unboatable in those conditions! |
Rêvo 361 Sportsman Jet (two-man)
70 horsepower 2Si engine and jet unit.
Lightweight hunting and fishing jet boat. Designed to get you further up rivers for better hunting and fishing. She will run in two inches of water, but unlike many small jet boats this has safe and secure handling. Light enough to drag and carry past impassable stretches of rivers to more boating beyond or light enough to get yourself out of trouble if you find yourself stuck when you are alone. These hulls are not just river boats but also very capable in harbours and lakes with a good soft ride and safe handling. We pull up a single skier no problems at all. Construction in either aluminium or Polyethylene. |
Watch video
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Rêvo 361 Sportsman Jet (three-man)
Shown here is one of our 361 wide body light weight jets which runs jet ski style running gear for moving further up shallow rivers for better fishing and hunting.
This boat has been built by Beachcraft Boats. The owner called and said when they finally hit the bottom and got out, the leathers on their boots didn't even get wet, just the soles. They were boating in 2 inches of water! Then they just picked the boat up and carried it back into about 200mm of water to get planing again. But their real surprise came when they ran the boat in the harbour and were very impressed with how she ran in rough water. He was happy to cross the Karitane Bar in the little boat. A very versatile little boat that can be used in rivers or on harbours and lakes. |
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The link below is a Rêvo 361 2022 model sold through DIYNO Kitset Boats built by James Bowdler, Queenstown, New Zealand. Aboard for the boats first run
rumble.com/v105puj-the-diyno-smile-aboard-the-the-diyno-361-jet.html |
Short video of the original Rêvo two man jet
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Rêvo 551 Diesel Jet Work Boat
Built by Pacific Hydraulics in Whangarei. Specifically designed as a work boat running marinised 3.0 litre Toyota diesel engines coupled to a Scott water jet. Pure work boats designed to do a job. These boats work in all conditions so have to have good sea keeping qualities but also stability for safety while hauling lines and working nets. This is an example of a Rêvo specific design to meet specific requirements using jet propulsion. The use of Toyota diesel engines was based on reliability and serviceability anywhere in the world and the need to remove petrol from the mother ships due to fire hazard. The boats are based purely on function and performance and that in itself makes them attractive to those charged with operating them. One skipper was quoted as saying, 'everyone will want one of these.' |
Rêvo Beachcraft 821 Jet
Designed for fishing and diving along the South Island's West Coast and regularly operates in rough seas across a notorious bar.
The owner can set the boat in the direction he wants and leave the helm. Described by a professional skipper who conducted sea trials on the boat as the best boat he has ever been on. The Scott 952 jet unit is superb and offers exceptional perfomance and handling. Click here for Scott Water Jet Built by Beachcraft Boats, Dunedin LOA 8.2 metres 370 Horsepower Scott 952 Water Jet |
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Rêvo Beachcraft 881 Jet9 metre jet boat.
Yanmar 430 horsepower engine coupled to a Hamilton 274 jet unit Built by Beachcraft Boats Dunedin |
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