Prop ? on Genesis boat

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  • BajaOutlaw33
    Member
    • Dec 2012
    • 39

    #1

    Prop ? on Genesis boat

    Im currently running a 3 Blade Alloy Boat Propeller 436x4 on my genesis with the stock motor and a turnigy 180 esc. I use 2 turnigy nano-tech 6000 batteries in series and the boat seems fast. My temps are good but I want to change my prop to see if I can go faster. I'm some what new to boating but I have been in the Car, Truck and Heli hobby for the past ten years. I have a 4mm shaft on there now but I would like to convert it to 3/16 and upgrade my prop. I just dont understand what 1.4 or 1.6P means or any other measurments for that matter. I do know what diameter is but I dont know what would be to big for my set up. Can anyone suggest a prop size or explain it and also tell me how to upgrade my shaft size? Thanks
  • lenny
    Fast Electric Addict!
    • Sep 2010
    • 4294

    #2
    Hi,
    What S or volts are your turnigy cells and what C rate are they ?

    The stock motor is a 3674 2075kv, Right ?

    1.4 and 1.6p is the pitch of the prop.

    And I think you can just pull out your flex shaft and liner,
    And replace it with the 187 flex shaft, You just need the right length or cut it to size need.

    Hear some links for info. http://forums.offshoreelectrics.com/...Steven-Vaccaro
    http://www.offshoreelectrics.com/propeller-chart.php
    ? ONLY IF THEY WORK

    My youtube videos.http://www.youtube.com/user/61manx?feature=mhee

    Comment

    • martin
      Fast Electric Addict!
      • Aug 2010
      • 2887

      #3
      To go to 3/16" flex + stub you need to change out the strut (ose sells the upgrade strut), or mod the existing strut by boring out the strut & fitting 3/16" lead teflon bushes. Not sure how the 3/16" flex will run with no liner as the stuffing tube is stainless & not brass, maybe ok but ive only run in brass.

      Comment

      • BajaOutlaw33
        Member
        • Dec 2012
        • 39

        #4
        Yes the stock motor is 2075k. I have the 3S or 11.1V running in series (Forgot to add that). I figured the higher the pitch the farther the prop goes per rotation. I have a full size boat so I figured the pitches are relivant to each other just in smaller scale. Im just not sure how big of a diameter I should go with my set up. I really dont want to spend 20 bucks a prop just to find out its to big or worse yet burn up my esc or motor. Could anyone suggest any specifc upgrade parts to go to a 3/16 shaft or where to locate them for a good price? Thanks

        Comment

        • lenny
          Fast Electric Addict!
          • Sep 2010
          • 4294

          #5
          Flex shaft kit and coupler and bushing for strut you can find on hear in the store or shop around some,
          Now, You are running the 3s packs in series for a total of 6s ? And what ( C ) are they !
          And what prop do you use ?
          ? ONLY IF THEY WORK

          My youtube videos.http://www.youtube.com/user/61manx?feature=mhee

          Comment

          • BajaOutlaw33
            Member
            • Dec 2012
            • 39

            #6
            The batteries are 50C. I just found the strut for my boat but I havent found the Flex shaft or coupler. Im really new to boats so its taking me a while to figure this all out. I bought a 3 Blade Alloy Boat Propeller 436x4 from hobby king when I built the boat. I honestly have no idea what those numbers mean. I just shoped around on hobbyking's site and read some reviews for that prop. I haven't ran any other prop yet. I keep on reading that switching to a 3/16 shaft will give me more prop options and more reliability.

            Comment

            • lenny
              Fast Electric Addict!
              • Sep 2010
              • 4294

              #7
              I have the same boat as you but they call it a Daytona and I have a different setup in it.

              Now, Are you sure the two 3s packs are in series for a total of 6s = 22.2 volts ?

              Or are the two 3s packs in parallel 3s = 11.1 volts ?
              ? ONLY IF THEY WORK

              My youtube videos.http://www.youtube.com/user/61manx?feature=mhee

              Comment

              • iamandrew
                Senior Member
                • Jul 2010
                • 577

                #8
                the "Daytona" is just what fighter cat sells them as.
                Large props on the genesis usually work, up to 45mm, but larger than that youll get handing issues

                Comment

                • BajaOutlaw33
                  Member
                  • Dec 2012
                  • 39

                  #9
                  Yes im positive its in series. I am somewhat new to brushless but I do have experience with my Erevo 1/10 (1/8 depending who you talk to) and my T-rex 450. I have been mainly nitro my since I started into the hobby but know I like both. I know I've read that the most people run on my set up is 5s MAX but when I first got the boat I had the pure intentions of switching out the motor to a lepoard. I knew heat would be my issue running at 6s so I ran all new cooling lines and isolated the esc from my motor in my cooling loop. Which why I think my temps are within range. I wanted to start upgrading my drive train before i go with a new motor but I want to see how far I can push the stock one. Hopefully without completly melting it or catching my boat on fire!

                  Comment

                  • BajaOutlaw33
                    Member
                    • Dec 2012
                    • 39

                    #10
                    What would you mean by handling issues?

                    Comment

                    • viper1
                      Senior Member
                      • Jun 2012
                      • 218

                      #11
                      Originally posted by BajaOutlaw33
                      What would you mean by handling issues?
                      She's relatively narrow, simply said: the boat will start 'rolling' around the prop on larger diameters.
                      (Not really but so you'll understand)

                      For the prop, try a 42mm maximum on that Kv. Pitch 1.4 (Octura M442?) By the way, the pitch means a factor from the diameter.
                      In other words 42x1.4 means 42 mm diameter, pitch 42x1.4 = 58.8
                      So per revolution the prop would go 58.8 mm forward in theory, IF you would have no slip.


                      On a similar setup I tickled 100Km/h-62mph but with 1900KV motor better quality than stock.
                      Wisdom is knowing how little we know

                      Comment

                      • viper1
                        Senior Member
                        • Jun 2012
                        • 218

                        #12
                        Originally posted by BajaOutlaw33
                        What would you mean by handling issues?
                        She's relatively narrow, simply said: the boat will start 'rolling' around the prop on larger diameters.
                        (Not really but so you'll understand)

                        For the prop, try a 42mm maximum on that Kv. Pitch 1.4 (Octura M442?) By the way, the pitch means a factor from the diameter.
                        In other words 42x1.4 means 42 mm diameter, pitch 42x1.4 = 58.8
                        So per revolution the prop would go 58.8 mm forward in theory, IF you would have no slip.


                        On a similar setup I tickled 100Km/h-62mph but with 1900KV motor but better quality than the stock.

                        Originally posted by martin
                        To go to 3/16" flex + stub you need to change out the strut (ose sells the upgrade strut), or mod the existing strut by boring out the strut & fitting 3/16" lead teflon bushes. Not sure how the 3/16" flex will run with no liner as the stuffing tube is stainless & not brass, maybe ok but ive only run in brass.
                        I machined my strut out when I upgraded the flex to 3/16", still using original SS stuffing tube -no liner- runs fine.
                        Wisdom is knowing how little we know

                        Comment

                        • martin
                          Fast Electric Addict!
                          • Aug 2010
                          • 2887

                          #13
                          Originally posted by viper1
                          She's relatively narrow, simply said: the boat will start 'rolling' around the prop on larger diameters.
                          (Not really but so you'll understand)

                          For the prop, try a 42mm maximum on that Kv. Pitch 1.4 (Octura M442?) By the way, the pitch means a factor from the diameter.
                          In other words 42x1.4 means 42 mm diameter, pitch 42x1.4 = 58.8
                          So per revolution the prop would go 58.8 mm forward in theory, IF you would have no slip.


                          On a similar setup I tickled 100Km/h-62mph but with 1900KV motor but better quality than the stock.



                          I machined my strut out when I upgraded the flex to 3/16", still using original SS stuffing tube -no liner- runs fine.
                          I take it you used 3/16 i/d x 1/4 o/d lead tefon bushes.
                          Last edited by martin; 02-21-2013, 11:42 AM.

                          Comment

                          • viper1
                            Senior Member
                            • Jun 2012
                            • 218

                            #14
                            Originally posted by martin
                            I take it you used 3/16 i/d x 1/14 o/d lead tefon bushes.
                            Correct

                            Edit; I read it again, 3/16x1/4 but I take it that was a typo
                            Wisdom is knowing how little we know

                            Comment

                            • BajaOutlaw33
                              Member
                              • Dec 2012
                              • 39

                              #15
                              Viper1 when you machined it do you mean you drilled out a 1/4 " through the strut and then used 3/16" inner by 1/4" bushings? My concern if I were to do that is if I can get it perfectly straight. Did you use a drill press? I think it might be easier for me to just buy a strut a flex shaft and a coupler. Thank you also for explaing the prop for me. I just need to do the 3/16 conversion before I can get that prop. What 1900 motor where u using? Thanks again everyone!!!

                              Comment

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