Kbb 34" mono build

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  • Luck as a Constant
    Make Total Destroy
    • Mar 2014
    • 1952

    #256
    All hulls are different. What works for one may not for another. Rear wheel in is correct. Nothing to do but try different stuff


    Sent from my iPhone using Tapatalk
    There's a hole at the center of earth where the rest of the world sinks but i stand still...

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    • royalcasa
      Senior Member
      • Mar 2014
      • 560

      #257
      you sure have a nice build Travis, hope you don't mind if I use a couple of your ideas.

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      • kfxguy
        Fast Electric Addict!
        • Oct 2013
        • 8750

        #258
        Originally posted by royalcasa View Post
        you sure have a nice build Travis, hope you don't mind if I use a couple of your ideas.
        Not at all!
        32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was

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        • kfxguy
          Fast Electric Addict!
          • Oct 2013
          • 8750

          #259
          In the shop tonight working on a couple builds. Decided to to a couple things to the mono while I wait on my parts. Just to rule out weight balance, I made a removable weight stick. It weighs 4.2oz with the four weights and the carbon plate they are stuck to. The difference in battery weights is 4.5oz so it should be close enough.




          32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was

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          • tlandauer
            Fast Electric Addict!
            • Apr 2011
            • 5660

            #260
            Travis, I shouldn't be saying anything, but my memory tells me that the leading edge angle to the bottom has to remain 90*, or it will have some lifting effects. I sharpen my bottom of the rudder just like what you have done. I think it was Grim Racer who wrote that. But his exact word was " radius"
            I could have understood wrongly.....
            Too many boats, not enough time...

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            • srislash
              Not there yet
              • Mar 2011
              • 7651

              #261
              I was contemplating that bottom edge the other night when I trimmed mine down Travis. That is a good take on it. I have a straight rudder and a tapered for the R-42 to experiment with. It is good to experiment for baselines.

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              • kfxguy
                Fast Electric Addict!
                • Oct 2013
                • 8750

                #262
                Originally posted by tlandauer View Post
                Travis, I shouldn't be saying anything, but my memory tells me that the leading edge angle to the bottom has to remain 90*, or it will have some lifting effects. I sharpen my bottom of the rudder just like what you have done. I think it was Grim Racer who wrote that. But his exact word was " radius"
                I could have understood wrongly.....

                I would figure if it was flat on the bottom it would have some lifting effects...no?
                32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was

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                • monojeff
                  Moderator
                  • Nov 2010
                  • 2551

                  #263
                  Originally posted by kfxguy View Post
                  I would figure if it was flat on the bottom it would have some lifting effects...no?
                  Yes correct flat bottom on rudder can create some lift.
                  Rounding it can help reduce the lift.
                  OSE GIFTING ELF
                  HAPPY HOLIDAYS!!

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                  • kfxguy
                    Fast Electric Addict!
                    • Oct 2013
                    • 8750

                    #264
                    Originally posted by monojeff View Post
                    Yes correct flat bottom on rudder can create some lift.
                    Rounding it can help reduce the lift.
                    So what does modding the rudder the way I did do?
                    32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was

                    Comment

                    • monojeff
                      Moderator
                      • Nov 2010
                      • 2551

                      #265
                      Don't know that it does anything.
                      Maybe reduces lift maybe not.
                      It tapered sorta like a ramp or V shape on bottom of a boat....
                      OSE GIFTING ELF
                      HAPPY HOLIDAYS!!

                      Comment

                      • tlandauer
                        Fast Electric Addict!
                        • Apr 2011
                        • 5660

                        #266
                        Originally posted by kfxguy View Post
                        I would figure if it was flat on the bottom it would have some lifting effects...no?
                        Yes, that is what I think, you didn't do anything wrong, the wedge shaped sharpening job is awesome. I only aired out my opinion because I thought if there was some ''rounding off'' of the front angle....
                        It was more of a question for my own knowledge as I had a bit of trouble picturing what was referred by Grim Racer in his response to someone ages ago....
                        I would think if the bottom wasn't sharpened , diagram #2 and #3 would have lifting effects as it serves like a "ramp".
                        Scan0003.jpg
                        Too many boats, not enough time...

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                        • kfxguy
                          Fast Electric Addict!
                          • Oct 2013
                          • 8750

                          #267
                          Well I guessthe worse that can happen is it handles bad and I just try a different one.
                          32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was

                          Comment

                          • flraptor07
                            Fast Electric Addict!
                            • Aug 2013
                            • 2451

                            #268
                            Originally posted by tlandauer View Post
                            Yes, that is what I think, you didn't do anything wrong, the wedge shaped sharpening job is awesome. I only aired out my opinion because I thought if there was some ''rounding off'' of the front angle....
                            It was more of a question for my own knowledge as I had a bit of trouble picturing what was referred by Grim Racer in his response to someone ages ago....
                            I would think if the bottom wasn't sharpened , diagram #2 and #3 would have lifting effects as it serves like a "ramp".
                            [ATTACH=CONFIG]130625[/ATTACH]
                            IMO the best would be like the middle one except the oposite, leave the leading edge longer. That way you know for sure there's no lift.

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                            • kfxguy
                              Fast Electric Addict!
                              • Oct 2013
                              • 8750

                              #269
                              My parts came in. I've realized that the trim tabs I had on there were probably more suited to about a 26" hull (they look right at home on my 26" shockwave). I added turn fins also. I want to go run it this weekend but it's supposed to rain the whole time. I'll see, if I get a chance I will.



                              I made two different mounting spots. One to the inside and one further out. I'm trying further in first. Looks like they are going to get in the way of water flow to the prop. Who knows.





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                              32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was

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                              • kfxguy
                                Fast Electric Addict!
                                • Oct 2013
                                • 8750

                                #270
                                Here's the turn fins. Also notice that I onlt drilled one extra hole on each side for the trims. They are plugged with screws. Of course once I get this thing lined out, extra holes will be filled, boat disassembled and then a nice paint job on it. I'm not painting it until I hit my speed goal as some things may need to be changed again. ****btw...if you see something I'm doing wrong, im ok if you point it out, this is still a learning process for me****



                                32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was

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