Back at it. Arkmodel Type VII.

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  • sam reichart
    Past President
    • Feb 2003
    • 1325

    #1

    Back at it. Arkmodel Type VII.

    It's been a bunch of years since I've had a boat built and running, so I decided to get back into the game with one of the Arkmodel Type VIIs. I have the kit, I have a new radio, a cylinder hopefully on the way soon and a ton of questions. So much has changed in the hobby while it was off doing other things. New radio technology, new electronics, new batteries, new build methods.
    I'm going to follow some of Bob Martin's lead on building this kit. I'm also looking to see what electronics, servos, speed controllers, batteries, magnets, etc. anyone would recommend to get the model completed.
    I'm expecting to use one of Dave Merriman's SAS cylinders, so I'm expecting minimally I'll need a BEC, failsafe and pitch controller. I believe "next thing" is brushless motors, but I'm not sure if this uses them. So, if I'm using brush motors, what's a good ESC, with a BEC?
    I talked to Matt the other day, and he gave me a quick lesson on LiPo batteries. I want to use magnets to button up the hull, and potentially for plane and rudder connectors.
    The kit looks pretty good! I'm torn as to whether or not to opt for the available photoetch brass, or to build it out of the box. I've gotten spoiled with the phtoetch options I've used on the Revell Type VII, and the photoetch Bob Dimmack supplies with his kits.
    Over on Bob Martin's forums, one of the members is building this kit, and he's already made some changes on the control surfaces and connectors. I expect I'll steal some of those ideas as well.
    I'll try to post here as I build.
    Any suggestions on components or techniques gladly welcomed.
    Last edited by sam reichart; 01-15-2017, 08:06 PM.
  • JWLaRue
    Managing Editor, SubCommittee Report
    • Aug 1994
    • 4281

    #2
    Hi Sam,

    Welcome back to the r/c sub building hobby!

    A number of us have had good success with the Mtroniks series of ESC's with BECs.

    If you are looking for a new radio, have you looked at the Vex radios that Bob Martin offers? Alternatively a couple of us have taken to picking up and using the Multiple Royal Evo radios. Dead simple to program, unlike the typical Japanese radios.

    Given the size of the boat you are building, using LiPo's is a really good idea. I've converted just about all of my boats over to them.

    We need to arrange for you to come up my way for a visit so that I can show you what I've been working on.

    -Jeff
    Rohr 1.....Los!

    Comment

    • thor
      SubCommittee Member
      • Feb 2009
      • 1479

      #3
      Sam! Welcome back, my friend! I am so happy to see you active again.
      Regards,

      Matt

      Comment

      • sam reichart
        Past President
        • Feb 2003
        • 1325

        #4
        Thanks gents. It's nice to be back.
        Jeff- I've got the vex transmitter and the sombra shadow 3 receiver with the programmer. My only gripe is the vex doesn't have the "traditional" throttle channel stick movement. Both sticks have spring returns to center.
        Matt has already convinced me that I need to go to LiPo and I was cruising around the Tower Hobbies site looking at batteres and chargers. Depending on the motor and space in the cylinder, I think I'll be able to find something there.

        Comment

        • JWLaRue
          Managing Editor, SubCommittee Report
          • Aug 1994
          • 4281

          #5
          Sam,

          Is the spring return on the throttle stick removable? Most of the radios that I've "opened up" also have a reversible racket plate....

          -Jeff
          Rohr 1.....Los!

          Comment

          • steveneill
            SubCommittee Member
            • Jul 2009
            • 716

            #6
            Saaaaam! Your're still alive!

            Steve
            www.steveneillsgarage.com

            Comment

            • sam reichart
              Past President
              • Feb 2003
              • 1325

              #7
              Originally posted by JWLaRue View Post
              Sam,

              Is the spring return on the throttle stick removable? Most of the radios that I've "opened up" also have a reversible racket plate....

              -Jeff
              Jeff- I don't know. Never opened one up, because all my other radios were already set. I've got to go find some documentation for this transmitter. One of the downsides of all new technology these days is nothing comes with documentation any longer. Google is my friend...

              Comment

              • PaulC
                Administrator
                • Feb 2003
                • 1542

                #8
                That's great news, Sam! Looking forward to the project.
                Warm regards,

                Paul Crozier
                <><

                Comment

                • sam reichart
                  Past President
                  • Feb 2003
                  • 1325

                  #9
                  Originally posted by steveneill View Post
                  Saaaaam! Your're still alive!

                  Steve
                  Hi Steve. Yep, still around. Been lurking for a long time.
                  Love your builds. You do great work with Bob's kits.

                  Comment

                  • steveneill
                    SubCommittee Member
                    • Jul 2009
                    • 716

                    #10
                    Originally posted by sam reichart View Post
                    Hi Steve. Yep, still around. Been lurking for a long time.
                    Love your builds. You do great work with Bob's kits.
                    Thanks but you're one hell of a builder so this will be a knock out VII!
                    www.steveneillsgarage.com

                    Comment

                    • bigdave
                      Junior Member
                      • Feb 2003
                      • 3596

                      #11
                      Looking forward to seeing a build Sam.
                      Nice kit from what I have heard.
                      BTW Jeff I would be remiss if I did not point out you forgot the X. BD
                      sigpic"Eat your pudding Mr Land"
                      "I ain't sure it's pudden" 20K

                      Comment

                      • Guest

                        #12
                        The BEC's on a lot of Mtroniks esc's are not robust enough for submarine use IMO, where you tend to have a lot of servos hanging off the 5 volt bus. It gets worse if you use a 11.1-14.4 volt power system rather than 6-7.4 volts.

                        They do supply special models with larger BEC's, but they come at quite a premium, and even then I would say no more than three servos, as the BEC is linear and they tend to be current limited unless you run humongous heatsinks.

                        Microgyros are better ESC's IMO, with a very good linear BEC and considerably cheaper when compared in spec to Mtroniks. They also do an excellent leveller. Ask Mike about the ESC and leveller package deal.

                        Website has been down for a while, but Mike is still trading- he gets enough business through word and mouth. Webpage archive link, the telephone number should still be fine.

                        Radio control boat and model submarine electronics.Model submarine pitch controller,depth controller.Electronic speed control,fast electric speed control


                        You might want to consider using a switchmode BEC if you find the onboard BEC is struggling. They are dirt cheap on ebay these days, about a £1 posted. e.g.



                        When it comes to batteries, have a gander at 18560 cells. These are a standard for lithium cells, and they come in cylindrical form like the old nicads. They're available in various capacities and prices, but good Panasonic cells are available inexpensively- as used by Tesla, type VII in ludicrous mode anyone? e.g.



                        These types of batteries are not used much in the hobby, because they have a lower C rating than some packs, and also the hard case makes them heavier- not so great for flyers where weight is everything. For a scale sub however, the power requirements are far more modest, and the extra weight is unlikely to be an issue, and can be an asset if you locate the batteries in the keel.

                        The capacity of these batteries is also very high for their size.
                        Last edited by Guest; 01-20-2017, 04:33 AM.

                        Comment

                        • JWLaRue
                          Managing Editor, SubCommittee Report
                          • Aug 1994
                          • 4281

                          #13
                          Interesting.....there are a number of us that use the Mtronik ESC's without issue.....

                          -Jeff
                          Rohr 1.....Los!

                          Comment

                          • Guest

                            #14
                            Okay, not sure if you're inferring I'm exaggerating or worse. Basically I don't give monkeys, it's your money and your choice.

                            Comment

                            • JWLaRue
                              Managing Editor, SubCommittee Report
                              • Aug 1994
                              • 4281

                              #15
                              I'm inferring neither. You're reading waaay too much into my reply.

                              Simply stating an observation, including my own experience. Would be nice to understand why there are such different experiences.

                              -Jeff
                              Rohr 1.....Los!

                              Comment

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