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prototype 6in. jet unit

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prototype 6in. jet unit

Postby Scottwaterjet » Sat Feb 02, 2013 3:04 pm

With all the interest in small 10-12 ft .boats resently we have been working on a 6.1 in. 2 stage jet unit. This is still in the prototype phase with no production date or pricing yet set. Here is a couple pictures of it being installed into a 3 meter boat we folded up for testing.
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Re: prototype 6in. jet unit

Postby Moab21 » Sat Feb 02, 2013 8:34 pm

This pump seems really cool. I hope you can keep it cheep and simple to stay in the spirit of the little boats.

I am looking forward to Seeing how it comes out.

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Re: prototype 6in. jet unit

Postby Alex Sib » Sun Feb 03, 2013 8:00 am

very nice looking pump. Please, keep posting AND LET US KNOW WHEN IT WILL AVAILABLE.
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Re: prototype 6in. jet unit

Postby Scottwaterjet » Mon Feb 04, 2013 12:57 pm

Some more pics of the jet, we have been doing some extreme testing with them to test both performance and durability. The nature of these small boats is that they will spend a good part of their time being used in small shallow rivers and therefore they must be very durable and have the ability to process alot of debri and still perform with partially blocked grates. This is the reason 99% of the jets we produce are two stage as in our testing nothing has come close to the ability of the two stage to process trash and still perform with partially blocked grates or worn and damaged impellors. Allot of the small creeks and rivers that we run are only accessable when in flood so the jet needs to cope with dirty water and lots of debri and this is where we find the two stage jet is awesome, the grip in white water is also far better with the two stage because even if the front impellor grabs air the rear one is still pumping which retains drive unlike a single stage once you lose drive it can take some time to reprime. The most stones we have removed from the grate so far after a day of extreme shallow water boating has been 38 and performance was still good . Its been a hoot testing these small jets as its been some time since we built our firts small boat which was back in the mid 1990's and to be honest we had forgotten how much fun these are, we are about to test the jet on some more engines, its a hell of a job but someone has to do it.
Basic specs on the jet as they are in testing
157mm dia (6.1''), front impellor 3 blade hardened with tungsten tips, Stator stainless steel vanes cast alloy body, rear impellor 3 blade hardened with tungsten tips, tail pipe ( rear stator) cast HD alloy, Nozzle hydraulically controlled patented Scott Trim Nozzle with changable nozzle rings, Reverse hydraulically controlled semi split duct reverse bucket - can be operated under power as a brake,(The trim and reverse share the same 12 volt hydraulic pump) Intake grate Bissaloy 25mm x 5mm HD bars, mainshaft 2205 HT stainless, front bearing is a SKF split race high thrust bearing gease lubricated bearing
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Re: prototype 6in. jet unit

Postby Lincoln » Mon Feb 04, 2013 9:53 pm

Can you get away with a smaller drive shaft? I would think some more output power could be gained with less rotating mass.
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Re: prototype 6in. jet unit

Postby markh2000 » Tue Feb 05, 2013 4:48 pm

What happened to the SeaDoo engine shown in picture #2 in your first post? I see in your last post you have a different engine coupled to the pump.

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Re: prototype 6in. jet unit

Postby Scottwaterjet » Tue Feb 05, 2013 4:59 pm

The small amount of power gained with a smaller shaft would not outway the strength and durablity that we gain with having a larger drive shaft.

The first engine was just sitting there while we were trying to figure a few things out. We are hoping to test with one of those bigger engines here in the near future.
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Re: prototype 6in. jet unit

Postby Lincoln » Tue Feb 05, 2013 8:06 pm

Thanks for the input. Lately I've been on a lighter is better kick and looking at that got me thinking (usually a bad thing).
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Re: prototype 6in. jet unit

Postby aston_driver » Sun Feb 10, 2013 6:36 pm

How did it run in testing?
Does this run "modified" impellors from the bigger waterjet or completely designed new impellors?
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Re: prototype 6in. jet unit

Postby Scottwaterjet » Mon Feb 11, 2013 5:46 pm

So far the testing we have done on that jet has been very impressive. It is a robust little unit with plenty of durablity and promise. The impellers have been built using our 7.5 inch jet impeller hubs and main shaft as we have those readily available . That makes for doing any changes during our R&D sessions quick and simple. This little unit is still a work in progress. We are working on getting several different engines in front of it. After that testing is all completed we will then look at what needs to be changed/ improved/or modified to go into production. As we test differenet engines we will post it up.
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Re: prototype 6in. jet unit

Postby aston_driver » Mon Feb 11, 2013 6:40 pm

Scottwaterjet wrote:So far the testing we have done on that jet has been very impressive. It is a robust little unit with plenty of durablity and promise. The impellers have been built using our 7.5 inch jet impeller hubs and main shaft as we have those readily available . That makes for doing any changes during our R&D sessions quick and simple. This little unit is still a work in progress. We are working on getting several different engines in front of it. After that testing is all completed we will then look at what needs to be changed/ improved/or modified to go into production. As we test differenet engines we will post it up.


Forgive for asking but wouldn't the bigger hub give you very little space left for decent vanes on the impellor, and that means an unreal test of it's performance?
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Re: prototype 6in. jet unit

Postby Scottwaterjet » Mon Feb 11, 2013 7:11 pm

You are correct. Using bits off the shelve does make doing changes during testing fast , simple and less expensive. Like I said before , once testing is done with the prototype we will get the production stuff dialed in. It is all work in progress. I would know from experiance that once we do all our testing and get to building impellers more suited to that size of unit that the preformance will do nothing but get better.
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Re: prototype 6in. jet unit

Postby Scottwaterjet » Tue Feb 12, 2013 9:42 pm

Pics of one of the sets of test impellors, this shows the blade area and scale of the impellor, we have 3 sets we are testing initially. We are about to now start testing different engines the next one being a Suzuki 1500 4 stroke which will be in testing soon, we will post pics of it as we get it ready. Initial testing has been very pleasing one of the boats is equipped with a 110 hp Rotax. We did some load lifting tests to see what it could do, we hooked it up to the second test boat to see if we could pull it up onto the plane, with two people in each boat and a total weight of 2300lbs we could could easilly tow the second boat up onto the plane and maintain both plaining at 3/4 throttle, we deliberatly connected onto the bow handle of the boat being towed and not the nose eye to make it as difficult to tow as possible we were shocked at how it pulled up both boats, very promising and once we get some power on board these should be a real hoot.
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Re: prototype 6in. jet unit

Postby Hamish » Thu Feb 14, 2013 11:34 pm

Hi,

Would this unit be compatible with the lower revving smallish car engines like the EA81 Subaru engine?

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Re: prototype 6in. jet unit

Postby Scottwaterjet » Sun Feb 17, 2013 2:54 pm

Hi We are going to test with a number of small automotive engines with this jet, we have over the years tested alot of Subaru engines and the EA81 is probally the lightest of them, but they do have their issue's. They have deep sumps which means getting them low enough to line up with the jet is very challenging (you have to fabricate a new sump and oil pick up) you also have to cut away alot of the engine bearers in the hull to get the flat 4 engine sitting down in the boat low enough to line up this weakens the hull considerbly and also makes the area under the cylinder heads very tight to get the exhaust out and then because the cylinders are so low they are inclined to suck water back into the cylinders. I feel there are some much better and simpler engine choices such as the Suzuki 1500 we are about to test as it has gone strait in with a std sump and flywheel diameter. We should be testing this week and I will post pics then
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Re: prototype 6in. jet unit

Postby rockchuckar » Tue May 28, 2013 4:36 pm

Here are some pictures from further testing of the new 612 jet unit. Konrad has been testing a Suzuki 1500 cc engine with it in the 3 .3 meter boat. The engine produces 115 hp . It has been pushing that boat to 47 mph @ 6200 rpm's.
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Re: prototype 6in. jet unit

Postby rockchuckar » Fri Jul 12, 2013 11:50 am

Here is the next prototype 612 getting ready to ship here to the US. With the way testing has gone so far, I can't wait to start testing here.
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Re: prototype 6in. jet unit

Postby Scottwaterjet » Thu Jul 18, 2013 1:49 pm

Pictures of a finished SWJ 612 ready to be crated for shipping, we are building several 612 jets at present for selected dealers/customers and one will be on its way very shorty to Schlagel Marine in the USA to fit to one of there demo boats for testing and to allow potential customers hands on testing, I know Jeff is very excited about having one in his hands, we are looking forward to his feedback as he always offers great feedback being an experienced jetboater. We have been doing test rides here with our test boats and the response has been excellent people are genuinely surprised at how well these small boats perform with even modest power the Suzuki Swift 1500 engine has really impressed people with its performance. We have been doing quite a lot of rock chewing to test the durability of the jet as the nature of these small boats is that they will get a lot of shallow water use and must be able to maintain performance with a partially blocked grate and after passing trash, they have come through with flying colours, the impellors are super tough and constructed with 6mm thick impellor blades hard tipped with tungsten, the centre stator section has steel stator vanes and the intake grate is very robust with eleven 25mm deep 5mm thick high tensile bissaloy 400 bars. Trim and reverse are both hydraulically operated and are therefore self locking and require no physical effort to operate, the reverse is joystick operated and is a very effective brake when needing to slow or stop in a hurry ( we have tested this numerous times in unexpected dead end creaks) and having trim is absolutely essential on these small boats especially as load and river conditions change, the ability to lift the bow when jumping trees is very hand
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Re: prototype 6in. jet unit

Postby SolarPanel » Thu Jul 18, 2013 3:50 pm

What's the price gonna be roughly?? Thx, Josh
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Re: prototype 6in. jet unit

Postby Scottwaterjet » Mon Jul 22, 2013 2:24 pm

We are still working on the application guide line and this is the reason we are testing with a variety of combinations so that our recommendations are based on actual testing, at this stage we are focusing on boats up to 15 ft and engines up to 350 hp and boats with a wet ready to run weight under 1300 lbs. The jet is designed for small displacement high RPM engines that have moderate torque, these engines need to be able to achieve higher RPM to produce their peak outputs. The Rpm range of the engine is directly related to the diameter of the jet - shaft speed times circumference of the impellor will give you impellor tip speed, the smaller the jet the higher the usable RPM range will be, but their are numerous other factors that also come into play such as volume (weight of water) through the jet this has a big effect on hole shot, lift, and mid range throttle response which are all super important for proper jetboating, this also has a huge impact on boat handling the more volume (weight of water) through the jet the more grip the hull will have, grill size, intake geometry and height are all very important factors as is nozzle discharge position, one of the reasons (their are many) we favour the two stage is the extra length from the transom to the outlet of the steering nozzle, the extra leverage this creates for better steering and trim control cannot be over stressed especially in a small boat, this also greatly enhances reverse operation as the water can be turned further back before it is redirected under the boat with the reverse bucket this allows for a much better water angle under the boat and a more effective reverse .
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