FighterCat Cheetah build

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  • properchopper
    • Apr 2007
    • 6968

    #1

    FighterCat Cheetah build

    I was commissioned to build a single-motor Cheetah for Cameron, who wanted to stay with a sport setup with decent speed and runtime on 4S2P. I advised him to have Keith build it for him; Keith's builds are impeccable, but Cameron lives nearby and wanted me to do it. With the bar set so high by KB, I set out to build a boat that measures up. After researching other Cheetah builds, most of which were 6S singles and twins, I came up with a single motor power package that can deliver speeds around 50 mph without too much current draw. A Leo 4082 2000KV motor and the trusty T-180 spinning a 447/3 was decided upon.

    One thing I learned from conversations with Keith and some of his Cheetah guys was that the tall transom needed a long strut to allow adequate adjustability. The commonly used TFL struts needed to have the mounting foot placed low on the transom, which made nutting the bolts inside tricky, clearance-wise. As a firm believer in HD hardware, I chose a Speedmaster skeg strut and 60/90 rudder, both needing some modding.

    First off, I reinforced the inner transom to keep things strong

    CB & Cheetah 1054.JPG CB & Cheetah 1056.JPG DSC03548.JPG
    2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
    2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
    '11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /Mono
  • properchopper
    • Apr 2007
    • 6968

    #2
    Cheetah build

    The Spd strut was for a .250 shaft, so I had to convert it to .187. Hmmm...

    First I pushed in .250 L/T bushings

    DSC03532.JPGDSC03536.JPG

    Then made a carrier for the final bushing

    DSC03534.JPG

    Now a standard Speedmaster .187 bushing slides right in

    DSC03538.JPG

    Stepped down the nose for the stuffing tube

    DSC03539.JPG
    2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
    2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
    '11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /Mono

    Comment

    • properchopper
      • Apr 2007
      • 6968

      #3
      Cheetah build

      Moved the strut inboard so drive dog/front of rudder line up, trimmed and rounded rudder bottom, and installed servo rod pass-through tube - I like to give the servo rod plenty of room to articulate without rubbing.

      DSC03558.JPG DSC03550.JPG DSC03552.JPG

      DSC03549.JPG
      2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
      2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
      '11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /Mono

      Comment

      • properchopper
        • Apr 2007
        • 6968

        #4
        One of the most essential considerations in determining component location is to first determine how this effects CG. Here is my rule of thumb :

        CB & Cheetah 1016.JPG

        After mocking up the insides

        DSC03557.JPG

        I use my extremely high-tech CG-Balance-O-Meter to see where I'm at

        DSC03556.JPG

        I can then mark the motor mount location, do the strut ( I used a teflon lined tube) and seal the bottom

        DSC03560.JPG
        Last edited by properchopper; 09-23-2012, 05:13 PM.
        2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
        2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
        '11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /Mono

        Comment

        • properchopper
          • Apr 2007
          • 6968

          #5
          Cheetah build

          I'm not a big fan of velcroing down the speedy. The speedy gets hot, loosens the adhesive & the esc moves around. Made a bed for the esc and shortened some bolts to use the tabs on the esc:

          DSC03567.JPG DSC03568.JPG

          To firmly glue down the battery trays inside the stepped sponsons I had to make some spacers (like trying to glue a 2 X 4 to a staircase)

          DSC03579.JPG

          To keep the cooling lines nice and neat, I hand-made some CF holders

          DSC03571.JPG

          Keeps the interior neat looking

          DSC03575.JPG
          2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
          2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
          '11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /Mono

          Comment

          • properchopper
            • Apr 2007
            • 6968

            #6
            Cheetah build

            Hatch retention : pinned front with 4mm stainless rod

            DSC03596.JPG DSC03597.JPG

            Rear uses anodized thumbscrews through grommets mating with nylon inserts. Simple, clean, strong and waterproof unlike the "twist n' locks" which are tricky to waterproof

            DSC03589.JPG DSC03590.JPG
            2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
            2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
            '11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /Mono

            Comment

            • properchopper
              • Apr 2007
              • 6968

              #7
              Cheetah build

              A few more details -

              Made a parallel adaptor using 8mm female for splice; soldered on to esc eliminating one slip-joint for better heat/resistance management

              DSC03586.JPG DSC03584.JPG

              Trick dual water outlets

              DSC03577.JPG
              2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
              2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
              '11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /Mono

              Comment

              • SirBudman32
                Senior Member
                • Aug 2011
                • 625

                #8
                Going to be doing one of these over the winter. I seen your write up on another forums page and gave me some go ideas for my build. One question I do have for you is I see that you used a SKEG type strut on this build, what is the reason for this as I have a regular type strut?
                Modified Jae21, Stock Jae21, Cheetah, Ul-1, Shock Wave 26 V2 (Rescue Boat).

                Comment

                • properchopper
                  • Apr 2007
                  • 6968

                  #9
                  A few graphics brighten things up.

                  DSC03603.JPG DSC03601.JPG DSC03602.JPG

                  A lot more "little details" went in to this build - maybe too boring to post. In all, this boat is one beaut; I'm strongly considering one for myself for some P-Offshore action.

                  Thanks for looking & feel free to "borrow" any ideas you'd like - We're all in this together

                  Tony
                  [email protected]
                  2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
                  2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
                  '11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /Mono

                  Comment

                  • properchopper
                    • Apr 2007
                    • 6968

                    #10
                    Originally posted by SirBudman32
                    Going to be doing one of these over the winter. I seen your write up on another forums page and gave me some go ideas for my build. One question I do have for you is I see that you used a SKEG type strut on this build, what is the reason for this as I have a regular type strut?
                    In theory a skeg strut will hold the boat to a tighter line in high speed turns.
                    2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
                    2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
                    '11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /Mono

                    Comment

                    • SirBudman32
                      Senior Member
                      • Aug 2011
                      • 625

                      #11
                      Ok thanks. Really looking forwards to the build as it will be my First. If I run into any problems I guess I know who to ask.
                      Modified Jae21, Stock Jae21, Cheetah, Ul-1, Shock Wave 26 V2 (Rescue Boat).

                      Comment

                      • properchopper
                        • Apr 2007
                        • 6968

                        #12
                        Originally posted by SirBudman32
                        Ok thanks. Really looking forwards to the build as it will be my First. If I run into any problems I guess I know who to ask.
                        I'll be there for you, Bro
                        2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
                        2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
                        '11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /Mono

                        Comment

                        • LOVE6S
                          Senior Member
                          • May 2012
                          • 545

                          #13
                          Originally posted by properchopper
                          A few more details -

                          Made a parallel adaptor using 8mm female for splice; soldered on to esc eliminating one slip-joint for better heat/resistance management

                          [ATTACH=CONFIG]84979[/ATTACH] [ATTACH=CONFIG]84978[/ATTACH]

                          Trick dual water outlets

                          [ATTACH=CONFIG]84980[/ATTACH]
                          What are the water outlets from, is it just a thru the hull conn, cut down, looks nice, good flow too I bet.

                          Comment

                          • properchopper
                            • Apr 2007
                            • 6968

                            #14
                            Originally posted by LOVE6S
                            What are the water outlets from, is it just a thru the hull conn, cut down, looks nice, good flow too I bet.
                            Darn, my secret's out
                            2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
                            2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
                            '11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /Mono

                            Comment

                            • Brushless55
                              Creator
                              • Oct 2008
                              • 9488

                              #15
                              Originally posted by properchopper
                              A few more details -

                              Made a parallel adaptor using 8mm female for splice; soldered on to esc eliminating one slip-joint for better heat/resistance management

                              [ATTACH=CONFIG]84979[/ATTACH] [ATTACH=CONFIG]84978[/ATTACH]

                              Trick dual water outlets

                              [ATTACH=CONFIG]84980[/ATTACH]
                              I like the 8mm idea, and I thought about that for my SF240's
                              on my PMono I soldered the second pair of battery wires on the underside of my T180 escs
                              works great and no heat what so ever
                              .NAMBA20...Caterpillar UL-1, P-Spec OM29, P-Mono DF33, P-Spec JAE, Aussie 33" Hydro-LSH, Sprintcat CC2028 on 8s, PT SS45 Q Hydro, PS295 UL-1 power, OSE Brothers Outlaw QMono 4-sale, Rio 51z CC2028 on 8s

                              Comment

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