How to find the center of gravity

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  • agentorange
    Senior Member
    • May 2013
    • 238
    #1

    How to find the center of gravity

    I know this might be a dumb and newbie question but how do you locate your boats CG. Why would you need to find it? Why is it important?
    Tags: None
    • properchopper
      [email protected]
      • Apr 2007
      • 6968
      #2
      If the CG is too far forward, the boat (especially monos) will nose steer/hunt, make pretty bow waves, and suck up power pushing a too-wetted hull through the water. If the CG is too far back the boat may porpoise (AKA the Wah-Wah or Oingo-Boingo) and produce charming blowover/backflips.

      In general, here's the "rule of thumb" for the CG from the stern :

      DSC04522.JPG

      This can be determined using a precision measuring device :

      DSC04394.JPG

      Used Thusly :

      DSC04521.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

        • ozzie-crawl
          Fast Electric Addict!
          • Sep 2008
          • 2865
          #3
          Were can i buy a super hitec co-g meter from

            Comment

            • properchopper
              [email protected]
              • Apr 2007
              • 6968
              #4
              Originally posted by ozzie-crawl
              Were can i buy a super hitec co-g meter from
              Most furniture stores carry them. You get four in a box for around fifty bucks and come with a free end table.
              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

                • jim82
                  Fast Electric Addict!
                  • Jan 2013
                  • 1358
                  #5
                  Originally posted by properchopper
                  Most furniture stores carry them. You get four to a box for around fifty bucks and come with a free end table.
                  LOL...Sorry I had to laugh at that one Tony...

                    Comment

                    • ozzie-crawl
                      Fast Electric Addict!
                      • Sep 2008
                      • 2865
                      #6
                      Originally posted by properchopper
                      Most furniture stores carry them. You get four in a box for around fifty bucks and come with a free end table.
                      Roflmao

                        Comment

                        • Neveryachtz
                          Member
                          • May 2013
                          • 82
                          #7
                          Hahahahahahahahaha

                            Comment

                            • DJGS1
                              Junior Member
                              • Feb 2012
                              • 18
                              #8
                              This is a NOOBIE question... When finding the COG, is that as if you're all taped up and ready to run (all hardware and batteries in the boat)?
                              Sometimes all you need to do is "finish".

                                Comment

                                • Fluid
                                  Fast and Furious
                                  • Apr 2007
                                  • 8012
                                  #9
                                  Yes, everything in the boat ready to run. The value is usually expressed in percent ahead of the transom. A 100cm boat that balances 30cm ahead of the tramson is said to have its CG at 30%.




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

                                    Comment

                                    • properchopper
                                      [email protected]
                                      • Apr 2007
                                      • 6968
                                      #10
                                      Originally posted by DJGS1
                                      This is a NOOBIE question... When finding the COG, is that as if you're all taped up and ready to run (all hardware and batteries in the boat)?
                                      Yes (tape optional)
                                      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

                                        • DJGS1
                                          Junior Member
                                          • Feb 2012
                                          • 18
                                          #11
                                          Originally posted by properchopper
                                          Yes (tape optional)
                                          Thank you.
                                          Sometimes all you need to do is "finish".

                                            Comment

                                            • DJGS1
                                              Junior Member
                                              • Feb 2012
                                              • 18
                                              #12
                                              Originally posted by Fluid
                                              Yes, everything in the boat ready to run. The value is usually expressed in percent ahead of the transom. A 100cm boat that balances 30cm ahead of the tramson is said to have its CG at 30%.




                                              .
                                              Thanks Fluid
                                              Sometimes all you need to do is "finish".

                                                Comment

                                                • agentorange
                                                  Senior Member
                                                  • May 2013
                                                  • 238
                                                  #13
                                                  Well thanks guys. As soon as i can get my hands on one of those high tech CG-O-Meters lol, i will have to check both of my boats.

                                                    Comment

                                                    • Cooper
                                                      Fast Electric Addict!
                                                      • Jan 2011
                                                      • 1141
                                                      #14
                                                      Lol, had to laugh, tony!!! And I had to build a house to get my free one!!! Only mine is round and plastic!!!! Love the rule of thumb!! Lmfao!!!

                                                        Comment

                                                        • Jason4636
                                                          Senior Member
                                                          • Jun 2012
                                                          • 654
                                                          #15
                                                          I have used a 1" dowel rod. Just roll it back and forth to find you CG

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