Location: South Australia Home Built Jet Dinghy's from New Zealand Just thought some of you might like to see these little home built aluminium jet boats from New Zealand. There are quite a few on youtube, some with Jetski engines, others running 600 to 1000cc motorcycle engines directly coupled to PWC jet pumps. I just came across these on youtube etc and thought members here may be interested in seeing them, or even be inspired to build one them self. I was merely searching the web for small 8-10' speedboats as I am wanting to build one suitable for a 25hp short-shaft Merc outboard I have. Location: South Australia Here is a link to the page showing the plastic sheet being made and fitted, with his explanation. We have a great jet-sprint series here in Australia, back 15 or so years ago we even had a course here in South Australia at Currency Creek built on the side of our lower Murray River system near Goolwa. It was a perfect location where the course sat in the bottom of a natural amphitheatre and the crowd watched on from the high land around it, and the sound of those big V8 engines at full power echoed off the hills. When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Location: Samogitia Build of small mahogany sailboat with water jet propulsion I began to build a mahogany boat with water jet drive and and own design wingsail. Using AutoCAD I tried to design a boat hull somewhat similar dinghy, yachts and powerboats hulls. My disposal I have a woodworking shop, CNC machining center, stainless steel welding equipment, AutoCAD using experience, joiners tools and experience. Well, I still think I can build this boat and am looking forward to constructive criticism from you.
Location: Samogitia Few pictures of boat building process CNC machined and assembled form for machogany boat build. Location: France Man, it's already looking very good - specially when you say you have no experience with boat building.
Location: Eustis, FL You don't really think that's anything close, to a reasonable set of sailing lines do you? If honestly I think that for better sailing lines need more boat wide, smaller transom and may be deeper keel. Location: Samogitia More of boat building process Showed that the first layer will not be easy to put correctly on the curved boat hull form.
Trying to resolve the situation with the springy rubber hose pieces pierced with wire hooks.
The second layer of mahogany cross diagonal bands is finished and sanded for outer 2,5 mm layer gluing. Location: Canada i still think a gear box would be a lot better but i will do with what i have for now ! Submarine Tom Previous Member   You could drop the buckets on this boat at speed and bury the bow anchor which was something for 62 feet (20m) and 60 tons. I think I get it now: 360's while docking is like a dog that turns around a few times before laying down. Location: US With 360 turning I was referring to the amazing slow speed maneuverability I get from my Hamilton hj212. Frosty Previous Member   I seem to remember that when reversing a jet you would turn the steering wheel the opposite direction to what you would normally. Originally Posted by jbmboats here is the pic of the rev bucket you will need for your yamaha jet pumps You may wish to custom adapt a different type of bucket that doesn't pivot as part of the nozzle.
Originally Posted by Frosty I seem to remember that when reversing a jet you would turn the steering wheel the opposite direction to what you would normally.

Location: Iowa Gentelmen, When you are talking about preloading an impeller you are referring to an inducer. And I'm not sure that airborne operation is an important design criteria when choosing a propulsion system for a fast ferry.
However, you are absolutely correct, the torque load on a jet drive does change when you take the boat out of the water.
For the most part, and I may be stretching here a bit, I don't perceive that the majority of contributors here are primarily concerned about launching their boats into the air. Heck, my boat would "perform" better if I threw a couple af 500HP diesels at it too! So what it seems to come down to is that Jet drive propulsion becomes a choice that is made by weighing a certain set of criteria. Location: France - Bourbriac Just to pull it up from the depths once more - and to twist it out of shape on the way. Location: Atlanta GA While we're on the subject, I'm in the final prototype of my foot-controlled electric powered personal watercraft - Stream Dancer.
In PBB there was a similar discussion of jet vs prop , and what caught my eye was a statement that the water accelerated by the hull on a 40 f'er was about 4 inches thick. While an inlet is fine for capturing a very small portion of this accelerated water , and increasing the jets efficiency, it is probably only capturing 5 or 10% of the energy already paid for. A high velocity prop stream (Atkin used small diameter props and 1-1 gearing) would operate in the already accelerated stream for better efficiency?
Certainly easier to change prop pitch , than have a variety of impellers cast, to optimize.
Regretably I don't have time to enter this discussion at the time, but I might suggest you post a similar inquiry on this other forum as sometimes there are many interested parties that do not cross over in the discussions.
Location: alaska Looking for some information on how to change lower unit from prop to jet unit.
Originally Posted by brian eiland It certainly appears as though the rim-driven propulsor concept has a lot of potential as a component in a jet pump drive system??ie, a rim driven impeller (?a new era of impeller design? as noted by YachtForums). A concept investigation has been carried out into the possibility of using a tip driven electro-magnetic propulsor as part of a waterjet propulsion unit.
The viability of the concept has been examined by considering the performance of an axial flow electromagnetic thruster developed for the ROV market and numerically studying its performance within a typical waterjet inflow.
Originally Posted by john zimmerlee But this is what I'm thinking: Build a catamaran with a tunnel down the centerline. If the width of the wheels are about the same as the depth of the tunnel, and the top of the tunnel is below the waterline, it should not cavitate and should have propulsion wherever the the boat can draft. The advantage of a squid drive is its rocket mode in the initial thrust as the water is taken in when the velocity is at zero.
With a jet you want to just accelerate the water backward rather then bringing it up to boat speed before ejecting.
When we wrote up the Samba in April 2009, it had already been through four prototypes, and several more have seen the water since then. One of the benefits from using a lightweight, low-powered craft with such efficient drives is that the range of the unit has now skyrocketed and Rodrigo expects to get more than three hours usage from a full charge ? well in excess of the 250 horsepower sit-down PWCs. The most importantly - the boat will have to be small and beautiful, will have low weight that I can carry it on my car's roof.
I've watched many boats images as shown on the internet and I have not bad joiner experience. You can adjust how much tension it applies but it was designed more so that the thrust from the nozzle doesn't kick the bucket back into the 'up' position.

While this will work for an 'adequite' reverse, it won't enable the type of manouvers described prior.
The more common bucket will work mounted on the jet bodies or the transoms.As for manouvres, they will be very restricted with your setup anyway. This does help your hole shot especially when working with a loader in the intake, but doesn't always produce a higher top end.
The one thing I have noticed from all the manufacturers websites and case studies is a propensity towards throwing a lot more power at jet drive systems. Electric-only fishing tournaments are popping up all over the place and interest is extremely high in this watercraft. The forum moderator of this other site has quite a bit of knowledge in the smaller jet units, particularly if you can draw him into the discussions. Recently purchased a 19' alumaweld formula vee and it has a 1995 150 hp 2.0L mercury that came with a jet unit. Now we know there is considerable work being done on rim-drive technology, particularly those incorporating permanent-magnet electric motor components to power-up the rim.
The primary advantage is that there is no need to insert a drive shaft within the waterjet inflow. It seems too logical and I can't find where any one is using this, so please tell me where my thinking is flawed.
The latest iteration has seen the shape and construction refined to such an extent that according to Rodrigo Silveira, just 65 bhp is now required to match the performance of the biggest 240-260 bhp Sea-Doo, Kawasaki and Yamaha designs.
With limited resources and the high burn-rate of funds associated with intensive R&D, Silveira acknowledges that he was on the verge of giving up when the breakthrough came. It is very hard to pull the bucket into the jetstream at full throttle anyway, you do need to back off a ways while the bucket is applied then mash it again. Or conversely, how much additional torque load is placed on a jet drive system when one adds, say, 500 lbs.
Reinell Flybridge with the twin diesels becomes airborne or starts chine walking due to excessive speed, I'll post a picture of my shorts! This significantly reduces cyclic variations in the propulsor inflow and removes an area of flow separation around the shaft.
It is concluded that for a typical size of waterjet with an input power requirement of 110 kW and diameter of 0.25m the maximum delivered power at 2,200 rpm would be 90 kW. But the aim had also been to eventually replace the 800cc twin-cylinder internal combustion engines the company was using in the development process with electric propulsion.
One thing to remember or think about from the above posts is that there were three styles of pumps mentioned above; axle flow, mixed flow, and centrifigul pumps these are not apple to apple comparisons. It also provides the designer with greater freedom as to the types of propulsion systems available and where they can be placed within the ship. I Rubbed the hull with epoxy resin, with six hand-help put fiberglass and dip the cloth by epoxy.
Instead, you simply leave the wheel right where it is, hit reverse and it's a thing of beauty.
And now it's too late to correct boat hull problems because, sadly but the hull is finished. Very nervous job.Will need to apply extra two layers of fiberglass without for preparing to warnish.

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