Pursuit jet boat

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  • srislash
    Not there yet
    • Mar 2011
    • 7673

    #1

    Pursuit jet boat

    Good day guys, I have moved to a new area of British Columbia and have been setting the property up so I haven?t posted in some time. But alas my hobby shack is working now so my first project is to convert the dog boat to a jet boat. Let?s start with George
    F08B5B9C-900F-4ACD-B998-54BF05E43AB2.jpg

    And my once beloved Bling Rocket

    1672B8DE-FA26-448D-B777-F825456C6965.jpg

    So the new location has a beach nearby which has a great shallow area and a great space for George to chase the boat. But I need this boat to be a jet boat for safety reasons now. BTW, the boat is beat up from George rescues, he is so proud of himself when he rescues it.
  • srislash
    Not there yet
    • Mar 2011
    • 7673

    #2
    So this is what I have so far as of yesterday:
    Boat gutted and a TFL jet drive, layout of hole

    My CG should remain close to where it was. Motor is yet to be determined.

    3B95F947-BBE1-4D5B-9673-0F39A21DFD1A.jpg41CD6DC6-8E75-4956-BC49-7CCCB3B137AD.jpg

    I?m not sure if I should widen the flat intake area or keep as much of the V as possible. I?ll take a few more speculative pics and report back.
    Any input as to motor size and such is appreciated. My thought here is that the boat must be faster than George can run in 1.5ft of water and really prefer it not to just spin out when I turn.

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    • a53hoop
      Member
      • Oct 2019
      • 65

      #3
      where about in bc are you. i am in salmon arm and have no boats guys that i can find any were near,AL

      Comment

      • Panther6834
        Senior Member
        • Apr 2020
        • 708

        #4
        I don't know anything about converting a V fire a jet drive...but, I do have a TFL Jet Boat. Looking at the bottom, there is 5mm of flat hull area on each side of the jet drive. I can't get calipers inside the hull to accurately measure spacing...but, to the best of my judgement, I'd estimate there's approx 2-3mm (closer to 3mm) of visible hull of each side of the drive. Not sure if this will help you...but, if it can, all the better.


        ~ More peace, love, and kindness would make the world a much better place

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        • srislash
          Not there yet
          • Mar 2011
          • 7673

          #5
          Originally posted by a53hoop
          where about in bc are you. i am in salmon arm and have no boats guys that i can find any were near,AL
          Hey Al, I moved to the hills just west of Oliver, Fairview area.
          Shawn

          Comment

          • lilbigmacky
            Junior Member
            • May 2020
            • 26

            #6
            I'm interested in this as well. I have always been a fan of jet boats and wanted to build an rc one. Im not sure about how removing the v will affect the ride but I know you dont want to restrict the intake because less water in means less water out which reduces thrust.

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            • srislash
              Not there yet
              • Mar 2011
              • 7673

              #7
              Originally posted by Panther6834
              I don't know anything about converting a V fire a jet drive...but, I do have a TFL Jet Boat. Looking at the bottom, there is 5mm of flat hull area on each side of the jet drive. I can't get calipers inside the hull to accurately measure spacing...but, to the best of my judgement, I'd estimate there's approx 2-3mm (closer to 3mm) of visible hull of each side of the drive. Not sure if this will help you...but, if it can, all the better.


              ~ More peace, love, and kindness would make the world a much better place
              Hey thanks for that, does be that hull have any spin out characteristics? I’ve had a couple of the old NQD jet boats(that’s where George started chasing boats). As soon as you juiced em up they started to be straight line boats. So I’ll try a couple hydrodynamic cues from them. I’m thinking a couple small strokes from jet pump intake to the transom.

              Comment

              • srislash
                Not there yet
                • Mar 2011
                • 7673

                #8
                Originally posted by lilbigmacky
                I'm interested in this as well. I have always been a fan of jet boats and wanted to build an rc one. Im not sure about how removing the v will affect the ride but I know you dont want to restrict the intake because less water in means less water out which reduces thrust.
                Yeah I think I’m going To taper the V forward till I get a desired ride attitude.
                Surprisingly there is little on information on general hydrodynamics of jet boats and such. I have visited this subject a couple times over the years and do have a balsa/ply flat bottom with Graupner jet yet to see water.

                Comment

                • fweasel
                  master of some
                  • Jul 2016
                  • 4279

                  #9
                  Jet boats typically have a flat ride pad. I would look at pictures of production models like the Thrasher and the TFL hull.

                  The only experience I have with running one is the Proboat riverjet I rebuilt for a project a few years ago. I would suggest under powering or under-volting it to begin with. Too much power on a jet boat makes for miserable control.
                  Vac-U-Tug Jr (13mph)

                  Comment

                  • srislash
                    Not there yet
                    • Mar 2011
                    • 7673

                    #10
                    Originally posted by fweasel
                    Jet boats typically have a flat ride pad. I would look at pictures of production models like the Thrasher and the TFL hull.

                    The only experience I have with running one is the Proboat riverjet I rebuilt for a project a few years ago. I would suggest under powering or under-volting it to begin with. Too much power on a jet boat makes for miserable control.
                    Hey there Ryan, yeah I’m going to stick with 20,000 rpm ish, maybe a 1600kv motor or something.

                    Comment

                    • Peter A
                      Fast Electric Addict!
                      • Sep 2012
                      • 1486

                      #11
                      20211002_101111.jpg20211002_101056.jpg20211002_101103.jpg20211002_101214.jpg

                      This is a jet boat I built earlier this year (during another lockdown). It was an old nitro flattie hull that I rebuilt to suit. Running the TFL jet unit with a SSS3674 1300 kv and OSE Raider esc on 4s. Runs pretty low current draw, I can get nearly 10 mins out of 6000 mah. I didn't want a super fast boat and am happy with the speed, it would be a fast scale speed, maybe 20-25mph. It does however spin out really easy so in due course I will put strakes on the front of the hull to try and keep the bow up in the turns. I have played with cg and turn fins but do not have it how I want it yet.
                      NZMPBA 2013, 2016 Open Electric Champion. NZMPBA 2016 P Offshore Champion.
                      2016 SUHA Q Sport Hydro Hi Points Champion.
                      BOPMPBC Open Mono, Open Electric Champion.

                      Comment

                      • srislash
                        Not there yet
                        • Mar 2011
                        • 7673

                        #12
                        Originally posted by Peter A
                        [ATTACH=CONFIG]174180[/ATTACH][ATTACH=CONFIG]174181[/ATTACH][ATTACH=CONFIG]174182[/ATTACH][ATTACH=CONFIG]174183[/ATTACH]

                        This is a jet boat I built earlier this year (during another lockdown). It was an old nitro flattie hull that I rebuilt to suit. Running the TFL jet unit with a SSS3674 1300 kv and OSE Raider esc on 4s. Runs pretty low current draw, I can get nearly 10 mins out of 6000 mah. I didn't want a super fast boat and am happy with the speed, it would be a fast scale speed, maybe 20-25mph. It does however spin out really easy so in due course I will put strakes on the front of the hull to try and keep the bow up in the turns. I have played with cg and turn fins but do not have it how I want it yet.
                        Thanks for the pics and input Peter. Great job on that. I have an outrunner at 1100 kv here that is size appropriate, I’m not opposed to a purchase either, I’ll dig around.
                        How many amps are you thinking on ESC then?
                        Last edited by srislash; 12-03-2021, 07:25 PM.

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                        • srislash
                          Not there yet
                          • Mar 2011
                          • 7673

                          #13
                          So I have the hull cut forward now but the pics should demonstrate the hull attitude I mentioned

                          049F4033-38FB-4B2B-B0AC-7FDC23AC59BF.jpg4A1D1939-5592-41B5-B4D9-BFA9BF79AF91.jpgE3D3641B-DF58-4887-AC06-F1FA86E29325.jpg

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                          • srislash
                            Not there yet
                            • Mar 2011
                            • 7673

                            #14
                            I have the pump outlet all hogged out to fit, just need to drill four mounting holes and then it will be fill in the holes time

                            ACA3FA1C-C393-4302-82EC-0C0D95DBF94A.jpg1982390D-B7EE-4E75-8271-6E1DD58C9041.jpg

                            Comment

                            • lilbigmacky
                              Junior Member
                              • May 2020
                              • 26

                              #15
                              I might build a flat bottom zippkits crackerbox in the future and put a big ol jet pump in there to see how it works. Id like to see how your jet projects turn out.

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