Rotary jet ski

Rotary jet ski DEFAULT

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As the little desert city along the shore of the mighty Colorado River starts to awake from its Winter slumber and the snow birds start to head home, the 2018 Hydro-Turf JetJam Racing series was prepping for its second weekend of racing in Lake Havasu City, AZ at the infamous Rotary Park. Friday during setup of the race site, the winds coming from California had presented the JetJam Redshirt crew a challenge of winds topping 30-plus mph! The challenge was accepted, course was set and they were ready to go for the weekend!

Saturday the winds were now a slight breeze and racers who had been to the site on Friday to start setting up their pits were relieved they had subsided and a great weekend was upon them. With the ever-growing Juniors classes, the 10-12 stock class had Jake Pierce showing Sebastien Girello and Dominic Cannady the fast way around the track and the 13-15’s Juniors had Brady Courson on top of a stacked class with great battles between Theo Beaumer and Revin Harris on the podium. Nedra Atwood had her cowbell ringing all weekend supporting her Junior racers!



Veteran Ski GP1 Open had Jeremy Poper coming all the way from Albuquerque, NM to show Joel Thayer and JB Gasperone of AZ he was number one for Saturday. Ski GP4 Stock had 14 riders take the line and battles between all were all throughout the course all day with Preston Matzdorff taking the overall win for Round 3. Women’s Ski GP2 limited, Kayoko Del Pardo held off Trisha Juarez and Bridget Poper for the top spot of the podium for Saturday.

Vintage GP1 550 Rob Flores made his way down from Las Vegas to Havasu for an overall win Saturday with Chris Hagest taking second and Brock Austin taking third. In Runabout GP2.2 Limited, Jason Ward from San Leandro, CA, took the top spot with Doug Wolff and Thomas Pagen taking second and third, respectively. One of the premier classes of the day was Ski GP1 Open, where Preston Matzdorff of Lake Havasu City, AZ atop his Kawasaki SX-R1500 took the top spot with JB Gaspeone and Aaron Geweke piloting Bullet hulls taking second and third for Saturday.



After a beautiful sunset that Arizona gives its residents every night, Sunday was upon us with more exciting racing on the waters of Lake Havasu for Round 4 of JetJam racing. Once again, Jake Pierce took the top spot on the podium over Sebastien Girello and Dominic Cannady for the Junior 10-12 GP3 Stock. Junior 13-15 GP3 Stock had Revin Harris taking the win over Brady Courson and Stevie Bascom. Sport GP3 Stock had Tyler Hill edging out Nick Leseney and Adam Levings for the win on Sunday. Ski GP2 Limited had Aaron Geweke, Trisha Juarez and Nathan Lopez on the top spots.

Runabout GP3 Stock had Brandon Warner taking the win over JoJo Thompson and Jackson Rod. Runabout GP2.3 Spark Only, a class gaining a lot of traction early, had Justin Black taking first with Kyle Cameron and Cory Bloedorn rounding out the class. X2 GP1 Open had a full 8 riders on the line. Team Retro Racing swept the podium on Sunday with Doug Wolff taking first, Matthew Goade in second and James Gagnon taking third. Once again, in Ski GP1 Open, Preston Matzdorff of Lake Havasu City, AZ showed Tim Warner of Albuquerque, NM and JB Gasperone of Flagstaff, AZ, he was the one to beat and taking the top spot again for Sunday.



During Sunday’s awards, JetJam gave away a SSR-125 pit bike to those participants who had raced Rounds 1-4. The lucky recipient was James Gagnon, whose ticket was pulled for the bike that was sponsored by RiverRat Motorsports in Lake Havasu City, AZ. We all know any event cannot move forward without the great support from sponsors; including title sponsor Hydro-Turf, presenting sponsor Bud Light, and Shark Energy Drink, Hidden Trails Motorsports, Skat-Trak, JetRenu. For more results and info to race with JetJam, please check out www.JetJam.racing.

All images courtesy of Ken Gallagher Photography. Unedited, full-sized originals can be purchased directly by clicking HERE.

Sours: https://watercraftjournal.com/gallery-hydroturf-jetjam-rounds-34-rotary-beach-lake-havasu-city-az/

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lp-mini2

Yes, what you’re looking at is a real rotary engine that is just a little bit bigger than an iPhone. This innovative little 4-stroke motor can produce 5 horsepower at 10,000 rpm and do so with only two moving parts. Officially unveiled by LiquidPiston during November’s SAE International/JSAE 2014 Small Engine Technology Conference in Italy, the “X Mini” is the successor to the company’s initial four-pound prototype that expelled 3.5 horsepower at 10,000 rpm.

Unlike its predecessor, Liquid Piston says that once finalized, X Mini could spin 15,000 rpm making more than five horsepower while weighing only three pounds. “The X Mini is an incredible breakthrough, and we expect to further optimize the engine for increased power (greater than 5 horsepower) and efficiency, and even lower operational noise,” says Dr. Alexander Shkolnik, president and co-founder of LiquidPiston.

Shkolnik sites LiquidPiston’s patented thermodynamic cycle and engine architecture as its greatest asset. Although previous larger displacement engines from the company produced 40 and 70 horsepower, the X Mini employs a High Efficiency Hybrid Cycle (HEHC) that allows the engine to be equally effective as it is condense, making it ideal for small displacement markets like “lawn and garden equipment, small motorcycles, robotics, range extenders for hybrids, auxiliary power units and even unmanned aerial vehicles,” according to a report by EngineLabs.

It continues, “The HEHC technology is said to optimize fuel efficiency by combining the best features of four current automotive engine cycles: high compression ratio in diesel; constant volume combustion in Otto; over-expansion to atmospheric pressure in Atkinson; and internal cooling with air or water in Rankine.”

Although similar to a Wankel or rotary engine with three separate combustion chambers to create three power strokes per revolution, LiquidPiston stresses that the engine doesn’t operate identical to the aforementioned engines. A closer study of the video below shows how the design is distinguished from other rotaries. Of course, the X Mini doesn’t offer itself for major applications in the PWC market, but a larger 70-horsepower unit using the same advanced technology could prove very useful for aftermarket standup ski builders.

Sours: https://watercraftjournal.com/video-liquidpistons-70cc-rotary-engine-spins-to-10000-rpm/
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Thread: rotary jet ski...!

  • 12-12-2007, 11:13 PM#1

    WATER WOODY is offline
    WATER WOODY's Avatar

    rotary jet ski...!


  • 12-13-2007, 03:25 PM#2

    jonjonwells is offline
    Wankel till I die!! jonjonwells's Avatar

    OK, who the hell put a bridge port into that thing. I want one too.


  • 12-14-2007, 01:06 PM#3

    RUNWME is offline
    RUNWME's Avatar

  • 12-14-2007, 01:16 PM#4

    Brett541 is offline

    I'd like to see that thing running in the water.


  • 12-14-2007, 03:53 PM#5

    WATER WOODY is offline
    WATER WOODY's Avatar
    Could be a Mazda motor. Isnt Mazda the developer on the rotary motor anyway?

  • 12-14-2007, 11:42 PM#6

    jonjonwells is offline
    Wankel till I die!! jonjonwells's Avatar

    Yes, it is a Mazda motor. That header is a dead giveaway. It is either a 12A or a 13B. Both have 2 rotors, just different cc's. It doesn't sound stock either, the idle is way off for that. I am thinking a very large port job.


  • 12-15-2007, 12:18 PM#7

    Trond is offline
    Norwegian Wiking Trond's Avatar
    Look at those sponsons!!!

  • 12-15-2007, 02:15 PM#8

    RX951 is offline
    Moderator RX951's Avatar

    speaking of Mazda motors, wasn't there a Mazdoo a few years back ? A guy put a rotary in a GSX ?


  • 12-15-2007, 05:11 PM#9

    Brett541 is offline

    i could have probably gotten a rotary from my friends 91' rx7 before he cubed it. (atleast i think it was a 91 maybe 93) but didnt occure to me at the time that it could go in a ski and i don't have the know-how to do it anyways.


  • 12-15-2007, 06:47 PM#10

    jonjonwells is offline
    Wankel till I die!! jonjonwells's Avatar

    I know that there have been at least 2 conversions done before. As for the know how, Dan Atkins would be the one to talk to.

    www.atkinsrotarymarine.com

    I have thought of doing this, but the engines are just too expensive. But then again, 300HP and lighter than a V-tec. The only down side to this type of engine in a watercraft is that they are lacking in HP at low RPMs. But from 5K-12K, you had best hold tight.


  • Sours: http://greenhulk.net/forums/
    Mazda 13B Rotary Engine Powered Jet Ski Project New Zealand - 2006

    Thread: No rotary engine jetskis!?

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    1. 03-13-2006, 09:39 PM#1

      WizzKidd!! is offline
      I dream skisWizzKidd!!'s Avatar

      No rotary engine jetskis!?

      Why hasn't anyone put a rotary motor into a jetski yet? They are lighter and more powerful than other engines, so it just makes sense to put one into a jetski! Has anyone heard of some attempts to do this at least? It seems to good to have not happened yet!

      QuoteOriginally Posted by K6Jet

      but when you want your shopping cart to do barrel rolls, you will need all four wheels


    2. 03-13-2006, 09:44 PM#2

      SBT is offline
      Administrator SBT's Avatar

      Re: No rotary engine jetskis!?

      It's happened as prototype, years ago. It never happened commercially because #1, they are not as efficient as engines that have come out in the meantime. #2, they rev too high natually to be of any use in a PWC, without detuning or using a gear reduction drive. #3, because they don't natually bolt up and there are no off the shelf parts to do an installation. #4 because used parts to do such a project are not cheap or easily or reliably found.

      Good project on paper, 10 years ago. Now, not much point.

      SBT is the World's Largest remanufacturer of PWC engines and parts. CLICK HERE for our store and full details on our site!


    3. 03-13-2006, 09:51 PM#3

      gj_fx1 is offline
      Top Doggj_fx1's Avatar

      Re: No rotary engine jetskis!?

      try a search on "mazdoo".


    4. 03-13-2006, 09:54 PM#4

      skiaddict is offline
      PWCToday Guru

      Re: No rotary engine jetskis!?

      I remember reading about that in Jet Sports like 4-5 years ago. Crazy.


    5. 03-13-2006, 10:03 PM#5

      SuperJETT is offline
      PWCToday.com Is My Home Away From HomeSuperJETT's Avatar

      Re: No rotary engine jetskis!?

      QuoteOriginally Posted by SBT

      It's happened as prototype, years ago. It never happened commercially because #1, they are not as efficient as engines that have come out in the meantime. #2, they rev too high natually to be of any use in a PWC, without detuning or using a gear reduction drive. #3, because they don't natually bolt up and there are no off the shelf parts to do an installation. #4 because used parts to do such a project are not cheap or easily or reliably found.

      Good project on paper, 10 years ago. Now, not much point.

      I've done some work on a rotary for a standup for freestyle and there were 2 main issues.

      Rotaries' eccentric shaft is in the centerline of the engine, now down low where it's a straight connection, which means an offset drive would be required increasing cost, size, and weight.

      Also, they really don't put out torque comparable to the 2-strokes we're using, not even close actually.

      Now, Tom Christiansen (Rexx Racing) on sea-doo.net put a Mazda 13B in a carbon fiber GSX hull and did get over 70mph with it, plus worked with some testers on kits to adapt the engine to different sitdown hulls, but the current crop of 4-strokes hit the market and it kinda killed his market potential.

    6. 03-13-2006, 10:20 PM#6

      mile9c1 is offline
      PWCToday.com Is My Home Away From Homemile9c1's Avatar

      Re: No rotary engine jetskis!?

      QuoteOriginally Posted by WizzKidd!!

      Why hasn't anyone put a rotary motor into a jetski yet?

      It seems like they'd have to develop one from scratch and that would cost millions upon millions of dollars that the manufacturer would never get back.

    7. 03-14-2006, 01:02 AM#7

      SuperJETT is offline
      PWCToday.com Is My Home Away From HomeSuperJETT's Avatar

      Re: No rotary engine jetskis!?

      QuoteOriginally Posted by mile9c1
      QuoteOriginally Posted by WizzKidd!!

      Why hasn't anyone put a rotary motor into a jetski yet?

      It seems like they'd have to develop one from scratch and that would cost millions upon millions of dollars that the manufacturer would never get back.
      Moller already did the research, Freedom Motors has a light twin rotor engine, but they aren't interestedin pwc really.

      One interesting development I found while researching/calling people is a tiny rotary made for small power tools, and a mega contract is out there signed by one of the top 3 tool companies to use it soon. That will be interesting if it comes to market. It was only like 10cc or something.

    8. 03-14-2006, 05:49 AM#8

      djyox is offline
      PWCToday.com Is My Home Away From Homedjyox's Avatar

      Re: No rotary engine jetskis!?

      I love rx7's... It is such a neet motor, even a 1.1 motor could spank a stock 1.5 honda.

      I would love to get one of those just to **** around with, and put into a lawnmower or somethen...

      -Nick


    9. 03-14-2006, 08:50 AM#9

      KevinS is offline
      Top DogKevinS's Avatar

      Re: No rotary engine jetskis!?

      I saw a video of some kids trying to blow-up a rotary in a mid-80s RX-7. They finally succeeded but only after about 11 minutes of WOT with no load. I am not sure that it would have blown even then, I can't remember if they forgot the rad cap or if it vented. Whatever it was, it lost its water.


    10. 03-14-2006, 11:13 AM#10

      skyking is offline
      PWCToday Guruskyking's Avatar

      Re: No rotary engine jetskis!?

      Good idea. No RPM limit on a Wankle (sp?)


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    Ski rotary jet

    Sea-Doo Rotary Valve

    Description

    This is a new 159 Degree Rotary Valve.

    A rotary valve refers to the fuel intake valve of earlier Sea-Doo two stroke engines.
    The rotary valve is driven off of a gear on the rotary shaft in the crankcase between the cylinders.
    This motion allows the intake port to be opened and closed in time with the engine power pulses.
    The rotary valve allows the port to have no restriction.
    Rotary valve engines are a very efficient design with complete control of airflow into an engine.
    They allow the air/fuel mixture to flow without any airflow restrictions (unlike like reeds).

    159 DEGREE VALVE
    1994 Sea-Doo XP Rotary Valve
    1995 Sea-Doo GTX Rotary Valve
    1995 Sea-Doo HX Rotary Valve
    1995 Sea-Doo SPX Rotary Valve
    1995 Sea-Doo XP Rotary Valve
    1995 Sea-Doo XP800 Rotary Valve
    1996 Sea-Doo Challenger Rotary Valve
    1996 Sea-Doo GSX Rotary Valve
    1996 Sea-Doo GTI Rotary Valve
    1996 Sea-Doo GTX Rotary Valve
    1996 Sea-Doo HX Rotary Valve
    1996 Sea-Doo SPX Rotary Valve
    1996 Sea-Doo XP Rotary Valve
    1997 Sea-Doo Challenger 1800 Rotary Valve
    1997 Sea-Doo Challenger Rotary Valve
    1997 Sea-Doo GS Rotary Valve
    1997 Sea-Doo GSI Rotary Valve
    1997 Sea-Doo GSX Rotary Valve
    1997 Sea-Doo GTI Rotary Valve
    1997 Sea-Doo GTS Rotary Valve
    1997 Sea-Doo GTX Rotary Valve
    1997 Sea-Doo HX Rotary Valve
    1997 Sea-Doo SPX Rotary Valve
    1997 Sea-Doo XP Rotary Valve
    1998 Sea-Doo Challenger Rotary Valve
    1998 Sea-Doo GS Rotary Valve
    1998 Sea-Doo GSI Rotary Valve
    1998 Sea-Doo GSX Rotary Valve
    1998 Sea-Doo GTI Rotary Valve
    1998 Sea-Doo GTS Rotary Valve
    1998 Sea-Doo GTX RFI Rotary Valve
    1998 Sea-Doo SPX Rotary Valve
    1999 Sea-Doo Challenger 1800 Rotary Valve
    1999 Sea Doo Jet Boat Speedster SK Rotary Valve
    1999 Sea Doo Jet Boat Speedster Rotary Valve
    1999 Sea Doo Jet Boat Sportster 1800 Rotary Valve
    1999 Sea-Doo GS Rotary Valve
    1999 Sea-Doo GSX RFI Rotary Valve
    1999 Sea-Doo GTI Rotary Valve
    1999 Sea-Doo GTS Rotary Valve
    1999 Sea-Doo GTX RFI Rotary Valve
    1999 Sea-Doo SPX Rotary Valve
    2000 Sea-Doo GS Rotary Valve
    2000 Sea-Doo GSX RFI Rotary Valve
    2000 Sea-Doo GTI Rotary Valve
    2000 Sea-Doo GTS Rotary Valve
    2000 Sea-Doo GTX RFI Rotary Valve
    2001 Sea-Doo GS Rotary Valve
    2001 Sea-Doo GTI Rotary Valve
    2001 Sea-Doo GTS Rotary Valve
    2001 Sea-Doo GTX RFI Rotary Valve
    2002 Sea-Doo GTX RFI Rotary Valve
    2002 Sea Doo PWC GTI Rotary Valve
    2002 Sea Doo PWC GTX RFI Rotary Valve
    2003 Sea-Doo GTI LE RFI Rotary Valve
    2003 Sea Doo PWC GTI LE Rotary Valve
    2003 Sea Doo PWC GTI Rotary Valve
    2004 Sea-Doo 3D RFI Rotary Valve
    2004 Sea Doo PWC GTI LE Rotary Valve
    2004 Sea Doo PWC GTI RFI Rotary Valve
    2004 Sea Doo PWC GTI Rotary Valve
    2005 Sea-Doo 3D RFI Rotary Valve
    2005 Sea-Doo GTI LE RFI Rotary Valve
    2005 Sea Doo PWC GTI RFI STD Rotary Valve
    2005 Sea Doo PWC GTI Rotary Valve

    Sours: https://jetskijunk.co.nz/product/sea-doo-rotary-valve/
    Theo's 13b Rotary turbo jet boat 82kmh at 0,7 bar

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