New Toy For The Swimming Pool

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  • rwtdiver
    Vice Admiral

    • Feb 2019
    • 1869

    #16
    I have made a little progress on my shark's thruster design and build.

    Click image for larger version

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    I am using the existing motor housings (green) but built a new housing around them in order to accommodate the new design for attaching the thrusters to the shark's gill area. Because my shark is smaller size than the original everything has to be modified to accommodate that size.

    Rob
    "Firemen can stand the heat."

    Comment

    • rwtdiver
      Vice Admiral

      • Feb 2019
      • 1869

      #17
      Trying to find a 36 mm X 4 mm thruster prop has proven to be a tough search! I did find one on amazon that fit the size, but 3 bladed. So, I turned to some simple 360 design work and created a 4 bladed prop with the correct sizing for my needs.

      Click image for larger version

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      I did mirror image on my slicer to get both CW and CCW props.

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      I manufactured the prop shrouds for the prop that I may be using?? The design I am doing may or may not work!? Again, building this smaller shark has created some real sizing and installation challenges.
      It's just going to be a bunch of work arounds in the hope that the designs work!

      But, that is what makes this hobby so much fun and challenging.!! :-))

      Rob
      "Firemen can stand the heat."

      Comment

      • redboat219
        Admiral

        • Dec 2008
        • 3032

        #18
        Rob,
        regarding the number of prop blades, sometimes less is more as David found out when he was building the waterjets for the Moebius Seaview. He experimented with 2, 3, 4 abd 5 bladed versions and found that 2 blades were more efficient, consumed less power and less load for the motor. Click image for larger version  Name:	Screenshot_20241023_110520_Microsoft 365 (Office).jpg Views:	0 Size:	75.4 KB ID:	183449
        Attached Files
        Last edited by redboat219; 10-22-2024, 11:08 PM.
        Make it simple, make strong, make it work!

        Comment

        • rwtdiver
          Vice Admiral

          • Feb 2019
          • 1869

          #19
          Originally posted by redboat219
          Rob,
          regarding the number of prop blades, sometimes less is more as David found out when he was building the waterjets for the Moebius Seaview. He experimented with 2, 3, 4 abd 5 bladed versions and found that 2 blades were more efficient, consumed less power and less load for the motor. Click image for larger version Name:	Screenshot_20241023_110520_Microsoft 365 (Office).jpg Views:	0 Size:	75.4 KB ID:	183449
          Thanks Romel!

          Thats some good information and checking into it even further I see that what you are saying seems correct. I have two coming from amazon (CW and CCW) that are 3 bladed. I will use those or 3D print some 3 bladed props.

          I see that Bob M. is using a 5 bladed prop in his thrusters, and they seem to not have that much pitch to them. The props that are used in the 100% scale model that I am building use a 4 bladed prop with not that much pitch to them.

          After this information you provided and my own research, I will not be using the 5 bladed ones that I printed up. In looking at them, they have way to much blade pitch as well...

          Thank you Romel for the great information!

          These are the props I have coming!


          Rob
          "Firemen can stand the heat."

          Last edited by rwtdiver; 10-23-2024, 03:13 AM.

          Comment

          • rwtdiver
            Vice Admiral

            • Feb 2019
            • 1869

            #20
            I have been designing and printing out the prototype thruster housings.

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            Looking like it might be heading in the right direction!?

            Rob
            "Firemen can stand the heat."

            Comment

            • rwtdiver
              Vice Admiral

              • Feb 2019
              • 1869

              #21
              I have a question for someone in the know!

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              When I get ready to install the prop to the shroud cover.

              My question is: What kind of clearance should there be between the interior of shroud and the prop blade for best performance?

              Thanks for any knowledgeable response!

              Rob
              "Firemen can stand the heat."



              Comment

              • rwtdiver
                Vice Admiral

                • Feb 2019
                • 1869

                #22
                The above question that I had on the thrusters, was answered by David M. If anyone is interested, go to "Todays Work" build blog and go to page 168, ant take a look at all the great photos that he posted up of thruster design and operation.

                I appreciate David so much for all the help he has given me over the years as I have pursued this wonderful hobby!

                Rob
                "Firemen can stand the heat."

                Comment

                • RCSubGuy
                  Welcome to my underwater realm!

                  • Aug 2009
                  • 1855

                  #23
                  Are the thrusters going to be mounted internally or externally?

                  Comment

                  • rwtdiver
                    Vice Admiral

                    • Feb 2019
                    • 1869

                    #24
                    Originally posted by RCSubGuy
                    Are the thrusters going to be mounted internally or externally?
                    Bob,

                    They are going to be mounted internally for my first attempt. If that does not work, I will move them to the outside. This is all new territory for me, and as usual I learn by mistakes!

                    Rob
                    "Firemen can stand the heat."

                    Comment

                    • rwtdiver
                      Vice Admiral

                      • Feb 2019
                      • 1869

                      #25
                      The photo below shows my final design, except for the sizing, which I am working on now.

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                      Water in and water out through the gills might be of some issue. Just won't know until I try it. As stated before this smaller size attempt at this shark is going to be challenging! But based on my past experimentation's in this hobby (stepping outside the box) I have some great models or surface runners... :-))

                      Pushing always forward!!

                      Rob
                      "Firemen can stand the heat."

                      Comment

                      • rwtdiver
                        Vice Admiral

                        • Feb 2019
                        • 1869

                        #26
                        I have finished up all of the parts design and I am just about ready to put the thrusters together.

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                        I have the two brushless motor ESC's ordered and they will be here tomorrow. When they arrive, I will complete the thruster housing with motors installed and then wire things up for a test run.

                        Rob
                        "Firemen can stand the heat."

                        Comment

                        • Rick Teskey
                          Lieutenant Commander

                          • Jan 2009
                          • 245

                          #27
                          What is prop dia?
                          no stators?

                          Comment

                          • rwtdiver
                            Vice Admiral

                            • Feb 2019
                            • 1869

                            #28
                            Originally posted by Rick Teskey
                            What is prop dia?
                            no stators?
                            No staters at this time, and a prop size of 36mm. This design is changing from day to day. Space inside the shark is limited. May be going to the outside with the thrusters..

                            Rob
                            "Firemen can stand the heat."

                            Comment

                            • rwtdiver
                              Vice Admiral

                              • Feb 2019
                              • 1869

                              #29
                              Well it looks like my idea for thrusters for my shark are not going to work! Because of the size that it was printed at the thruster assembles are just to large and will not fit.


                              I am left with installing them on the exterior of the body just above the two lateral fins. Bob Martins original shark was designed using this same methos and it really looked as though it worked very well.

                              I've already been approached by a TON of people wanting to know how much and when they can get one. At this time, I've got build commissions that will take m...


                              Oh Well! Win some loose some! I need a bigger printer so that I can build my submarines and this shark to scale. Every time I change the original files to accommodate my printer I always run into challenges. But, is this not what this hobby is all about?! :-))

                              Firemen can stand the heat."

                              Comment

                              • rwtdiver
                                Vice Admiral

                                • Feb 2019
                                • 1869

                                #30
                                This morning at 3:00 AM. After working one more time on my thruster design! I think the above photo about going to the exterior is my the better way.

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                                As you can see, there just is not enough space.

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                                I Have designed and redesigned and fabricated these thruster parts and ideas to death. With this in mind I will go forward with the exterior installation with the thrusters.

                                Now I have another issue that keeps me awake all night, and that is the controlling system!? Oh well I will stop complaining and get back to work!!

                                Rob
                                "Firemen can stand the heat."
                                Last edited by rwtdiver; 10-30-2024, 02:30 PM.

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