Pulling "Hole Shots" -- Sprint Cat 40 -- Flipped out!

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  • mm123521
    Senior Member
    • Sep 2010
    • 150
    #1

    Pulling "Hole Shots" -- Sprint Cat 40 -- Flipped out!

    Pulling hole shots with my Sprint Cat 40.
    Twin CC 1520 motors
    6S2P -- 10000Mah total
    X447 Right and Left props

    Sorry for the poor videos -- I am running the radio and the camera.
    Check out the flip - it was caused by "Blast Acceleration" raising the bow too high.

    This thing is standing on the props, bow high, when starting (it almost flipped about 30 feet out!). Flipped when I got off the throttle, then got back on.
    http://www.youtube.com/watch?v=qvu4dJbVhwM


    Note the "bow high" attitude when starting, then I ran out of lake!!!
    http://www.youtube.com/watch?v=JMk2QfFUkj0


    Check out this "wheele"
    http://www.youtube.com/watch?v=7QPsBLwlX_g


    http://www.youtube.com/watch?v=OqMkMMZuypE


    My other toy:
    http://youtu.be/WhVavTvlvjg


    Mark
    Last edited by mm123521; 04-09-2011, 05:21 PM.
    Avatar is the dangerous end of a Gatling Gun!
    Tags: None
    • egneg
      Fast Electric Addict!
      • Feb 2008
      • 4670
      #2
      This is a hole shot ...

      http://www.youtube.com/watch?v=AMelS7V4_3M
      IMPBA 20481S D-12

        Comment

        • mm123521
          Senior Member
          • Sep 2010
          • 150
          #3
          Yah! See the prop torque roll that boat!!

          On a twin it stays flatter.

          Good action shots!

          Mark
          Avatar is the dangerous end of a Gatling Gun!

            Comment

            • carlcisneros
              Fast Electric Addict!
              • Jan 2010
              • 1218
              #4
              what ESC's are you running it that beast?

                Comment

                • mm123521
                  Senior Member
                  • Sep 2010
                  • 150
                  #5
                  They are just T180's

                  I am learning about batteries.
                  Those "hole shots" were with 40C batteries.

                  The 25C zippeys dont even compare - they will not do hole shots and they are visably slower. All are 5000Mah times two batteries.

                  Pulling hole shots must be really hard on the ESC's !

                  Mark
                  Avatar is the dangerous end of a Gatling Gun!

                    Comment

                    • oscarel
                      Fast Electric Addict!
                      • Dec 2009
                      • 2130
                      #6
                      I've got the same thing happening with my Top Gun and twin 1717's with X450/3's. I'm also using T180's and I've recorded 300 amps per on hole shots so be careful with the 25C lipos.

                        Comment

                        • Brushless55
                          Creator
                          • Oct 2008
                          • 9488
                          #7
                          Looks cool man!
                          I wonder what the top speed of your cat is?
                          .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

                            • mm123521
                              Senior Member
                              • Sep 2010
                              • 150
                              #8
                              Oscral,

                              Is that 300 amps for both motors or just one?
                              What batteries are you using?
                              1717's are a lot of power!


                              Brussless55,
                              I have nothing to measure the speed, but I can guess:

                              I am running 6S and 1600KV so thats 35500 RPM unloaded.
                              X447's pitch is 2.59 inch so my speed, with 20% slip should be about 69MPH.
                              But thats with unloaded RPM, so I figure the speed is in the low or middle 60's.

                              I have 1800KV motors (cc1518) ready to drop in, that would get me into the 70's
                              BUT I'am scared! for now this is all the speed I can handle!


                              Mark
                              Last edited by mm123521; 04-10-2011, 09:30 AM.
                              Avatar is the dangerous end of a Gatling Gun!

                                Comment

                                • Brushless55
                                  Creator
                                  • Oct 2008
                                  • 9488
                                  #9
                                  right on man..
                                  I really dig these hulls, and I wish they made a 36-38" version
                                  .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

                                    • oscarel
                                      Fast Electric Addict!
                                      • Dec 2009
                                      • 2130
                                      #10
                                      Just 1 motor. I'm using Turnigy 5000mah 40C in 6S2P setup .
                                      I've measured 68mph so far.

                                        Comment

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