Motor Experiment

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  • MAMBA2200
    I need a scooby snack
    • Jul 2012
    • 1202

    #1

    Motor Experiment

    so this weekend i got my 3674 leopard 1900kv 4 pole back and i wanted to compare it to my tacon 3674 1900kv 2 pole motor so the test boat was a mystic 29 and running 4s so off to the pond i go i ran the tacon first and using my gps i took it out and run it for 2 minutes brought it in and checked out temps and speed ambient temp was 42 water temp was also low 40's
    round 1 tacon 2 pole 2 min run: motor temp was 74 esc temp was 76

    round 2 leopard 4 pole 2 min run: motor temp was 84 esc temp was 77

    here is the kicker with the tacon motor i had a speed of 49mph with the leopard motor only 46mph

    now by all rights the leopard should be the faster motor but it was not and this shocked me because i thought the leopard should have been a little better all around and b4 you say the tacon will not last i have ran the crap out of this 36 dollar motor and is still was faster than the 88 dollar motor i have many tacon motors and ive always had great luck with them never got a bad one by no means am i bashing either motor cause they seem to be clones but for the money difference i just wanted to share my info and findings
    Im Only Responsible For What I Say Not For What You Understand
  • Basstronics
    Fast Electric Addict!
    • Jun 2008
    • 2345

    #2
    Did you recharge the batts?
    42" Osprey, 32" Pursuit, 26" Bling Rocket (rescue), Blizzard Rigger, JAE 21FE rigger, Hobby King rigger (RIP)

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    • Fluid
      Fast and Furious
      • Apr 2007
      • 8012

      #3
      Wow Scott, don't they teach punctuation in Tennessee? Your post is kinda hard to follow, but the first thing that comes to mind is what packs were you using? Were they both charged to the same voltage and at the same starting temperature for each test? Were the water conditions similar for each run? Did you follow the exact same driving course for each run? If you run the GPS with the Tacon does it give identical speeds on back-to-back runs?

      These are both budget motors so variances within each line are to be expected. The Tacon may test out to have a 2001 Kv while the Leopard may actually be a 1915 Kv. Just because they have the same outer dimensions and Kvs does not make them comparable - you'd be surprised what my Kv checker has shown on many motors. I find your test data very interesting, more so after the questions above are answered. Thanks for the effort.

      Here is a different test: https://www.rc-monster.com/forum/showthread.php?t=29390

      BTW late model Tacons are 4-pole. http://www.hobbypartz.com/96m802-4074-2150kv.html



      .
      Last edited by Fluid; 11-26-2012, 11:24 AM. Reason: typo
      ERROR 403 - This is not the page you are looking for

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      • Brushless55
        Creator
        • Oct 2008
        • 9488

        #4
        Originally posted by Fluid
        Wow Scott, don't they teach punctuation in Tennessee? Your post is kinda hard to follow, but the first thing that comes to mind is what packs were you using? Were they both charged to the same voltage and at the same starting temperature for each test? Were the water conditions similar for each run? Did you follow the exact same driving course for each run? If you run the GPS with the Tacon does it give identical speeds on back-to-back runs?

        These are both budget motors so variances within each line are to be expected. The Tacon may test out to have a 2001 Kv while the Leopard may actually be a 1915 Kv. Just because they have the same outer dimensions and Kvs does not make them comparable - you'd be surprised what my Kv checker has shown on many motors. I find your test data very interesting, more so after the questions above are answered. Thanks for the effort.



        .
        that's a good point
        .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

        • MAMBA2200
          I need a scooby snack
          • Jul 2012
          • 1202

          #5
          yes batts were at same start voltage same temp i did 2 runs with each motor and these were the average btween the 2 runs i ran the same distance within a tenth and same water conditions and the packs were sky lipo 5000mah and 40c all four packs were brand new first run on all four packs the first run on tacon was 49 2nd run 49.2 leopard 46.3 2nd 43.5 and yes the 4074 tacons are 4 pole but the 3674 are 2 pole http://www.hobbypartz.com/96m215-3674-1900kv-9t.html
          Im Only Responsible For What I Say Not For What You Understand

          Comment

          • Fluid
            Fast and Furious
            • Apr 2007
            • 8012

            #6
            Yes, apparently I can't read very well this morning. Very interesting results.



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

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            • siberianhusky
              Fast Electric Addict!
              • Dec 2009
              • 2187

              #7
              Very interesting, I've never run a leopard and was going to post and ask if anybody had done a comparison between them and Castle which I have run. Just might be trying one in my new Whip.
              If my boats upside down then who owns the one I thought I was driving the last two laps?

              Comment

              • Speedtospare
                Junior Member
                • Nov 2012
                • 2

                #8
                Don't the 2 pole motors have more RPM ability per volt? Generally 2 people motors will rev higher and 4 pole will generate more torque no?

                Comment

                • kevinpratt823
                  Fast Electric Addict!
                  • Aug 2012
                  • 1361

                  #9
                  You said all 4 lipos were brand new, correct? I would be interested to see the results after they were all cycled a few times to break them in some. They can be a touch inconsistent when brand new, especially if one's been sitting longer.......
                  My private off road rc track
                  https://www.youtube.com/watch?v=XC3H...yaNZNA&index=8

                  Comment

                  • Fluid
                    Fast and Furious
                    • Apr 2007
                    • 8012

                    #10
                    Don't the 2 pole motors have more RPM ability per volt? Generally 2 people motors will rev higher and 4 pole will generate more torque no?
                    No, the rpm ability is determined by the motor Kv, not the number of poles. I have raced both 2-pole and 4-pole motors spinning over 40,000 rpm. Comparing two motors of the same size and Kv, one 2-pole and one 4-pole, the latter will pull away from the bank much harder and pull a larger prop at the same rpm.


                    I've never run a leopard and was going to post and ask if anybody had done a comparison between them and Castle which I have run.
                    Check out the video for an anecdotal comparison.



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

                    Comment

                    • MAMBA2200
                      I need a scooby snack
                      • Jul 2012
                      • 1202

                      #11
                      You said all 4 lipos were brand new, correct? I would be interested to see the results after they were all cycled a few times to break them in some. They can be a touch inconsistent when brand new, especially if one's been sitting longer.......
                      im gonna do it again just for that reason to see how the batteries react
                      Im Only Responsible For What I Say Not For What You Understand

                      Comment

                      • siberianhusky
                        Fast Electric Addict!
                        • Dec 2009
                        • 2187

                        #12
                        Thats what I was commenting on, thanks for posting that! Interesting about all 3 having about the same amp draw on the same gearing, as he says at the end it would be really nice to test them on a dyno.
                        If my boats upside down then who owns the one I thought I was driving the last two laps?

                        Comment

                        • Mike Caruso
                          Senior Member
                          • May 2012
                          • 940

                          #13
                          Originally posted by Fluid
                          Wow Scott, don't they teach punctuation in Tennessee? Your post is kinda hard to follow, but the first thing that comes to mind is what packs were you using? Were they both charged to the same voltage and at the same starting temperature for each test? Were the water conditions similar for each run? Did you follow the exact same driving course for each run? If you run the GPS with the Tacon does it give identical speeds on back-to-back runs?

                          These are both budget motors so variances within each line are to be expected. The Tacon may test out to have a 2001 Kv while the Leopard may actually be a 1915 Kv. Just because they have the same outer dimensions and Kvs does not make them comparable - you'd be surprised what my Kv checker has shown on many motors. I find your test data very interesting, more so after the questions above are answered. Thanks for the effort.

                          Here is a different test: https://www.rc-monster.com/forum/showthread.php?t=29390

                          BTW late model Tacons are 4-pole. http://www.hobbypartz.com/96m802-4074-2150kv.html



                          .
                          you'd be surprised what my Kv checker has shown on many motor.

                          Is this something you bought or made?
                          Do It Like You Mean It .....or Don't Bother

                          Comment

                          • 785boats
                            Wet Track Racing
                            • Nov 2008
                            • 3169

                            #14
                            Mamba.
                            If your Tacon motor is a Y wind, & you have the timing up to say 15 degrees or so, you will need to turn the timing down to around 1 - 3 degrees for the Leopard motor, as it is a D wind motor & too much timing will cause extra heat & also not allow the motor to reach max revs. What timing settings did you use on each motor?

                            But some time ago, both myself and another club member did similar tests between 2 pole 3674 8Xl 2075 kv motors ( both FSD & Feigao ) & the Leopard 3674 2200kv 4 pole motor. Even with the adjusted timing settings the 2 pole motors were cooler & faster than the Leopard with the same props in the same boats. We tried them in both monos & hydros. You would think, as we did, that the extra kv & the extra torque of the extra two poles, that the Leopard would be quicker & cooler. But that's not what we saw. Granted, the Leopard should be able to swing a bigger prop too, but we didn't even bother trying that as we thought they would get even hotter.

                            Fluid.
                            I'd be interested in knowing where to get a KV checker too.

                            Cheers.
                            Paul.
                            See the danger. THEN DO IT ANYWAY!!!
                            http://forums.offshoreelectrics.com/...hp?albumid=319
                            http://forums.offshoreelectrics.com/...hp?albumid=320

                            Comment

                            • MAMBA2200
                              I need a scooby snack
                              • Jul 2012
                              • 1202

                              #15
                              i used the same timing 3.25
                              Im Only Responsible For What I Say Not For What You Understand

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