Announcement

Collapse

Forum rules and expectations

Hello, and welcome to the forums at the Nautilus Drydocks, formerly Sub-driver.com!

We welcome anyone with a passion for submarines and a desire to learn and share knowledge about this fascinating hobby. Use of these forums indicates your intention to abide by our code of conduct:


1. No spam. All automated messages, advertisements, and links to competitor websites will be deleted immediately.

2. Please post in relevant sub-forums only. Messages posted in the wrong topic area will be removed and placed in the correct sub-forum by moderators.

3. Respect other users. No flaming or abusing fellow forum members. Users who continue to post inflammatory, abusive comments will be deleted from the forum after or without a warning.

4. No threats or harassment of other users will be tolerated. Any instance of threatening or harassing behavior is grounds for deletion from the forums.

5. No profanity or pornography is allowed. Posts containing adult material will be deleted.

6. No re-posting of copyrighted materials or other illegal content is allowed. Any posts containing illegal content or copyrighted materials will be deleted.
See more
See less

Motor keep stopping...

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Motor keep stopping...

    Hi guys,
    I have just completed my first rc submarine. It is the ArkModel Type VII. I am using a VEX radio and Dave Merriman WTC. Everything is about two years old.

    I have it balanced at both surface and dive positions with no issues. My problem comes in the motor operations.

    When I first turn the radio on and move the throttle gimbal-no response. After that first movement everything works perfectly!

    I took it to the lake and the motors became intermittent after 15 minutes of operation. They would stop then suddenly start working again, then stop, then start. You get the picture.

    I pulled it from the lake and back on the work bench everything worked perfectly, other than that first gimbal movement. I cannot get the motors to not run.

    I pulled everything form the WTC and checked all wiring and installed. The ESC lights up each time the throttle gimbal is moved.

    Back at the lake, it ran great for about 30 minutes then it stopped all together and would not restart. All other commands work as they should.

    Back on the work bench, it initially did not run then after a few gimblal moves, everything started working again.

    The antenna is run along the length of the WTC inside a plastic tube, capped on the end.

    Can someone shed some light on this. I am a newbie to subs but not rc modeling.

    All help and advice will be appreciated.

    Thanks,
    TINFISH

  • #2
    Hi Tinfish,

    Are both the motor ran off one speed controller. As you still have other functions it's not a BEC issue, It sounds like the speed control if over heating and shutting down. Do the motors work again after few minutes ?

    Cheers.
    Tim

    Comment


    • #3
      Hi Tim,
      First, thank you for taking the time to address my motor issue. All other commands work properly without issue.
      Now, yes, both motors run off of a single ESC. The speed controller lights every time power is applied, as I believe it should. Also, when I was balancing it the motors were working intermediately and they were only in the water a couple of minutes which would eliminate over heating.
      First time at the lake, the trouble started after about 10-15 minutes. Last time out, it was 30 or so.
      I keep hitting my head every direction I turn. I have a new receiver coming tomorrow. I'll try that first.
      Thanks again,
      Mike

      Comment


      • #4
        Mike,
        May I ask what speed controller? I'll tell you why I am asking. Some speed controllers have overheat or protection to stop from damaging itself from too much drain on it. It will do what you are saying, run for a little bit, overheat, stop, cool down, run again, overheat .....you get the picture.
        Beautiful sub you have there.
        Peace,
        Tom
        If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.

        Comment


        • #5
          Originally posted by TINFISH View Post
          Hi guys,
          I have just completed my first rc submarine. It is the ArkModel Type VII. I am using a VEX radio and Dave Merriman WTC. Everything is about two years old.

          I have it balanced at both surface and dive positions with no issues. My problem comes in the motor operations.

          When I first turn the radio on and move the throttle gimbal-no response. After that first movement everything works perfectly!

          I took it to the lake and the motors became intermittent after 15 minutes of operation. They would stop then suddenly start working again, then stop, then start. You get the picture.

          I pulled it from the lake and back on the work bench everything worked perfectly, other than that first gimbal movement. I cannot get the motors to not run.

          I pulled everything form the WTC and checked all wiring and installed. The ESC lights up each time the throttle gimbal is moved.

          Back at the lake, it ran great for about 30 minutes then it stopped all together and would not restart. All other commands work as they should.

          Back on the work bench, it initially did not run then after a few gimblal moves, everything started working again.

          The antenna is run along the length of the WTC inside a plastic tube, capped on the end.

          Can someone shed some light on this. I am a newbie to subs but not rc modeling.

          All help and advice will be appreciated.

          Thanks,
          TINFISH
          That non-start of the motor after switching on the SD is an artifact of the MTroniks start-up protocol. Not to worry. It's normal for those ESC's.

          As we discussed during today's video chit-chat the bad-guy here is likely an overworked BEC within the ESC. Buy a dedicated BEC, install it and plug its 4.8-volts into an unused receiver port -- that will insure enough current to drive all the servos and other devices without this glitching. Here's a good source for said BEC:

          https://www.amazon.com/DGZZI-Plastic...037666&sr=8-75

          When you plug the dedicated BEC into your SD make sure to pull the red wire from the ESC's servo lead... not the blue wire or we all die horribly!!!

          David
          "... well, that takes care of Jorgenson's theory!"

          Comment


          • #6
            Thank you so much Dave. I have it ordered and should be here Tuesday. I'll get in installed in time to go to the SubFest 2020 and try it out there.
            I really appreciate the help
            Mike

            Comment


            • #7
              Tim and Tom are making valid points -- could be the ESC itself. Stick the propellers in the water and put an Ampere meter in series with the battery, go full throttle (the propellers deep enough not to suck surface air) and record the total current draw. Discount one Ampere as hotel load, the balance is what the motors are drawing. Is that number over the continuous current rating of the ESC?

              David
              "... well, that takes care of Jorgenson's theory!"

              Comment


              • #8
                If you put together the drive train according to the Arkmodel instructions there may be too much friction in the system. There is not enough clearance for the plastic sleeve unless you removed a bunch of plastic around it. I used brass tubing with a very loose fit on the drive shaft instead. Too much friction overheats the motors and reduces their life and creates too much current draw thru the speed control.

                Comment


                • #9
                  Originally posted by TINFISH View Post
                  Hi Tim,
                  . Also, when I was balancing it the motors were working intermediately ...
                  Mike
                  Hi mike...I am jumping in here late...but the above statement glared out at me-When you say intermediately,when they are running, are they both running at the same time? or is one motor running faster then the other? If both motors are controlled by one (the same) ESC and both motors were working at different RPMs intermittently, then it has to be a wiring problem-whatever the ESC is putting out to two motors in parallel, the motors have to run at the same RPM...BUT WAIT! any chance that you have wired the two motors in series? .-BG
                  Last edited by Bob Gato; 09-14-2020, 08:30 PM.

                  Comment


                  • #10
                    Thanks for the input guys. I took the boat to the lake today and it ran perfect, with no start/stop issues, for about 30 minutes.
                    yhe only thing I know may be different was I have certain the antenna was completely stretched out and not curled up inside the hull. Which I wouldn't think would be an issue.
                    well see how it runs in Cohutta this weekend.
                    mike

                    Comment

                    Working...
                    X