Who's running a Tranny in a FE boat?

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  • ReddyWatts
    Fast Electric Addict!
    • Apr 2007
    • 1711

    #16
    I used cigarette paper to set the correct spacing between the gears, but I have shelved the trans for larger or lower KV motors.
    ReddyWatts fleet photo
    M1 Supercat - Neu 1527 1Y, 8s / Mean Machine- Feigao 580, 8s, 120 HV esc
    Mean Machine - Feigao 540 14XL, 8s, 100 amp HV esc, X537/3

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    • Meniscus
      Refuse the box exists!
      • Jul 2008
      • 3225

      #17
      Thanks for the input guys! I have to say I'm a sport guy, not racing. Sure it would be fun, but I don't have the money to replace stuff, LOL.

      I'm looking forward to trying a tranny setup. Is the Fine Design transmission the main one boaters use nowadays?
      IMPBA: 7-Time FE World Record Holder "Don't think outside the box. Rather, refuse to admit that the box exists in the first place!"

      MGM Controllers - Giant Power Lipos - ML Boatworks - Wholt's Wire Drives & Struts - Nano-Oil

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      • egneg
        Fast Electric Addict!
        • Feb 2008
        • 4670

        #18
        Ben if you want you can have the gearbox that came out of my cat. It is setup to use 1 or 2 motors and geared about 2:1. It had a pair of Kyosho ST360 brushed motors originally. the pinions are 1/8 in and the drive gear is 4mm. The brass inserts in the plastic gears could be drilled to a larger size.
        IMPBA 20481S D-12

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        • Fluid
          Fast and Furious
          • Apr 2007
          • 8011

          #19
          I used cigarette paper to set the correct spacing between the gears...
          We found that is too much lash for high power setups - teeth shear especially if running in rough water where prop speed is constantly varying. Setting at near zero lash puts the strain nearer the tooth root for better strength. Efficiency suffers slightly, especially if the gears are not turning on true centers.


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          ERROR 403 - This is not the page you are looking for

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          • Meniscus
            Refuse the box exists!
            • Jul 2008
            • 3225

            #20
            Originally posted by Fluid
            We found that is too much lash for high power setups - teeth shear especially if running in rough water where prop speed is constantly varying. Setting at near zero lash puts the strain nearer the tooth root for better strength. Efficiency suffers slightly, especially if the gears are not turning on true centers.
            OK, I admit, I don't understand your post Fluid. Could you please provide some clarity.

            Egneg, I appreciate the offer. I may have to try that for some testing and learning what does or doesn't work. What can I say, I like to make my own path. It leads to different perspectives and approaches.
            IMPBA: 7-Time FE World Record Holder "Don't think outside the box. Rather, refuse to admit that the box exists in the first place!"

            MGM Controllers - Giant Power Lipos - ML Boatworks - Wholt's Wire Drives & Struts - Nano-Oil

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            • jevmax
              Legend
              • Aug 2007
              • 368

              #21
              You can get hard coated aluminum gears from W.M. Berg. I've run them in some extreme SAW set-ups and set records. Never stripped a gear using an aluminum pinion and a nylon spur gear, with a tight gear mesh as Jay T suggests.

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              • Fluid
                Fast and Furious
                • Apr 2007
                • 8011

                #22
                OK, I admit, I don't understand your post Fluid. Could you please provide some clarity...
                Sure...gin, vodka, glycerol, distilled water, oxygen gas....those clear enough for you?



                j/k. What part of the post isn't clear to you?



                .
                ERROR 403 - This is not the page you are looking for

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                • ED66677
                  Fast Electric Addict!
                  • Apr 2007
                  • 1300

                  #23
                  what Fluid means is that you need to have some gap between gears, he used to use cigarette paper (as thickness gage) to set this gap, but with such a small gap gears still can rotate one from the other and in rough water this "chocks" them together when the prop is going high above water and deap in water, when the prop is out, gears are free, when it touches the water again the very high torque shears the teeth, to avoid or limit this, you need to set no gap between gears but friction is then very important and efficiency drop considerably.
                  Using helicoidal gears might help to counter this effect but it would cost much more to build... assuming you can find some helicoidal gears?!
                  Emmanuel
                  I'm french but I doubt I really am!
                  http://pagesperso-orange.fr/pleindetrucs/

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                  • Meniscus
                    Refuse the box exists!
                    • Jul 2008
                    • 3225

                    #24
                    I get it. I think I had too much to drink that night...or not enough.

                    ...a little too much ballast on the port side...
                    IMPBA: 7-Time FE World Record Holder "Don't think outside the box. Rather, refuse to admit that the box exists in the first place!"

                    MGM Controllers - Giant Power Lipos - ML Boatworks - Wholt's Wire Drives & Struts - Nano-Oil

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                    • ED66677
                      Fast Electric Addict!
                      • Apr 2007
                      • 1300

                      #25
                      If I was to build a strong and efficient one I would do it this way... very expensive way

                      dual helicoidal spur gear in opposition for a noiseless "progressive attack" and smooth operation
                      Emmanuel
                      I'm french but I doubt I really am!
                      http://pagesperso-orange.fr/pleindetrucs/

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                      • Meniscus
                        Refuse the box exists!
                        • Jul 2008
                        • 3225

                        #26
                        I've seen this kind of system. I'm not sure if the guy I got turned onto does it this way. Wow, that thing looks advanced no matter how you look at it. Where did you find this?
                        IMPBA: 7-Time FE World Record Holder "Don't think outside the box. Rather, refuse to admit that the box exists in the first place!"

                        MGM Controllers - Giant Power Lipos - ML Boatworks - Wholt's Wire Drives & Struts - Nano-Oil

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                        • Jeff Wohlt
                          Fast Electric Addict!
                          • Jan 2008
                          • 2716

                          #27
                          But that gear box looks 1:1 so it does no good for what we are considering.

                          As jve said....there are alum gears out there. I used to run some boxes and I have to admit...very forgiving and was nice on the motors and ESCs and you always had options...once you found the right gear. It allows you a ton of options for props....almost too many!

                          The hardest part was figuring it all out....at least for me it was but I still never burned anything...they were all brushed motors as well. Heck I was running P225 prop on a 12cell 550 macbuchi motors with 2:1 gears and they lasted a very long time and running 2200 cells in a 33" boat. Still very fast.

                          Chris Fine has all the combos for running his gear boxes. He is always ready to share info....if you can talk with him on the phone.
                          www.rcraceboat.com

                          [email protected]

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                          • Meniscus
                            Refuse the box exists!
                            • Jul 2008
                            • 3225

                            #28
                            Cool! I'll have to try speaking with him. I'd just hate to waste anyone's time until I educate myself, LOL!
                            IMPBA: 7-Time FE World Record Holder "Don't think outside the box. Rather, refuse to admit that the box exists in the first place!"

                            MGM Controllers - Giant Power Lipos - ML Boatworks - Wholt's Wire Drives & Struts - Nano-Oil

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                            • ED66677
                              Fast Electric Addict!
                              • Apr 2007
                              • 1300

                              #29
                              The one I posted before is only an example of helicoidal spur gear not an existing tranny at all, this was just to show twin gears! twin gears on the motor side and twin gears on the prop shaft, this kind of assembly reduce the lash to its minimum! using single helicoidal gears on both side would create some axial effort, twins in opposition counter this effect!
                              Again this is probably the most expensive way to it!
                              Emmanuel
                              I'm french but I doubt I really am!
                              http://pagesperso-orange.fr/pleindetrucs/

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                              • egneg
                                Fast Electric Addict!
                                • Feb 2008
                                • 4670

                                #30
                                what about a 2 speed planetary gear system like that used in cordless drills?
                                IMPBA 20481S D-12

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