HK ARTR Sprint Formula3 Tunnel Hull Outboard

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  • Snowride
    Senior Member
    • Sep 2010
    • 297

    #1

    HK ARTR Sprint Formula3 Tunnel Hull Outboard

    Does anyone have any experience with this unit? I just purchased one and OMG is the finish on this nice. Seems like the same outboard as offered here on OSE called the mini outboard. Looking for some feedback on different setups. Probably up the motor to a 3500kva from the stock 3000 and stick to 3S, will be trying a 32mm 1.7 cnc prop and maybe even the 35mm 1.7 to see what this will do. Here is a link to the boat. http://www.hobbyking.com/hobbyking/s...or_630mm_.html Here is a link to a video of one which really seems to scoot. http://www.youtube.com/watch?v=Y7sPk...layer_embedded
  • kendt
    Senior Member
    • Jul 2011
    • 557

    #2
    It looks cool in the video. Better than I would have thought and its kind of a cool design. Something a bit different. 3000kv is actually a good set up for 3s although probably not the one that's on it. I would think Something in the 17-1800 watt range with a 120a esc would be ideal.

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    • Snowride
      Senior Member
      • Sep 2010
      • 297

      #3
      On that video he has a 3500kv motor and running 4S. Looks like he is doing 60+ with that setup. He has a stock prop which I believe is a cnc 32 x 1.4. The one in the video is not the same as HK even though they are. What I mean is HK has their version compared to this place in Australia which sell the same boat but is comes stock with the 3500kv motor and has the 32mm CNC prop. http://shop.rcboatbitz.com.au/index....oducts_id=1448 Basically they are saying a 3500kv motor on 3s will scoot this thing at 78kph or 48mph. Running 4S on that same setup must bring it 60+

      I really really like the sealed hull design where you tape down the transparent cover under the canopy. No water intrusion to the ESC or receiver or anything inside. Motor and flex shaft are on the outside incorporated into the outboard which is really high quailty. This is going to be a blast.
      Last edited by Snowride; 09-16-2013, 04:43 PM.

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      • kendt
        Senior Member
        • Jul 2011
        • 557

        #4
        Well its quick for sure but I would be very surprised if it was hitting 60. My boats all run on 6s and are faster than that. 50 for a hull that size would be screaming.

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        • Snowride
          Senior Member
          • Sep 2010
          • 297

          #5
          Originally posted by kendt
          Well its quick for sure but I would be very surprised if it was hitting 60. My boats all run on 6s and are faster than that. 50 for a hull that size would be screaming.
          If you look at the link above you will see it is tested with 3S via gps and advertised doing 48mph out of the box. Now that guy in the video has upgraded the stock esc to be able to run 4S on the same setup. I don't know the math but lets just say the additional 1800 rpm must give him a bit more. Maybe 3-4 mph? Change to a more aggressive prop and who knows. If I get a solid, reliable 50mph on a 24" hull with the stability shown in the video, I am a happy camper.

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          • Heaving Earth
            Banned
            • Jun 2012
            • 1877

            #6
            i always liked the looks of those little buggers. looks pretty cool for small ponds

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            • Snowride
              Senior Member
              • Sep 2010
              • 297

              #7
              Finally got her all together and ran her. Hard part is keeping the nose down but it is getting better as I tweak. A little more and I should have her perfect. Managed an honest 46mph but ran out of room. Can easily add 2-3 mph in this configuration. Temps all around are nice and warm at best, hottest being the batteries at 100ºF after a hard 10 min run, the rest is around 80ºF. If I can get this stable and running to the T, I will test the 35mm x 1.7 cnc prop to see how far I can push this hull.

              Setup now is twin Nano Tech 5800mah 2S 40-80C batteries combined to run 4S at the motor. Perfect setup for this hull as I am getting a good 10mins of run time. Motor is a Turnigy Typhoon 3450. ESC, Turnigy 180A. Prop, 32mm x 1.7 CNC.

              On a 24" hull, 46mph is really screaming to say the least, gotta love it.

              May need to look into the flex cable as today I snapped one clean.



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              • tlandauer
                Fast Electric Addict!
                • Apr 2011
                • 5666

                #8
                This is great news! I too like this hull very much, but I think I am going to wait a bit as I have my eye on the Popeye.

                I am not familiar with Turnigy motors, is that an In-runner or Out-Runner? Does it come stock with the boat? And in the photo do you have to run the ESC to motor wire really long? I can't tell by looking at your picture.
                Thanks for posting these pictures!
                Too many boats, not enough time...

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                • lenny
                  Fast Electric Addict!
                  • Sep 2010
                  • 4294

                  #9
                  Check how many mah go back in to the 5800mahs pack when you charge it back up,
                  Also what do the cells read on the 5800mah packs now after that 10 minute run ?
                  ? ONLY IF THEY WORK

                  My youtube videos.http://www.youtube.com/user/61manx?feature=mhee

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                  • Snowride
                    Senior Member
                    • Sep 2010
                    • 297

                    #10
                    Originally posted by lenny
                    Check how many mah go back in to the 5800mahs pack when you charge it back up,
                    Also what do the cells read on the 5800mah packs now after that 10 minute run ?
                    Will do, they still have 3.75v per cell left after a good 10 min run after a 10 min max cool down time. Could probably still safely squeeze a couple more minutes out of her.
                    Last edited by Snowride; 09-28-2013, 08:48 PM.

                    Comment

                    • Snowride
                      Senior Member
                      • Sep 2010
                      • 297

                      #11
                      Originally posted by tlandauer
                      This is great news! I too like this hull very much, but I think I am going to wait a bit as I have my eye on the Popeye.

                      I am not familiar with Turnigy motors, is that an In-runner or Out-Runner? Does it come stock with the boat? And in the photo do you have to run the ESC to motor wire really long? I can't tell by looking at your picture.
                      Thanks for posting these pictures!
                      Outrunner used for 450 class helicopters. Stock is an el cheapo 3000kv no brand name. Here is a link to the Typhoon which has fantastic ratings and apparently capable of 880 watts. This is an excellent motor yet only costs $15. Only mod required was to cut down the shaft length as it was a little to long. http://www.hobbyking.com/hobbyking/s...50_class_.html

                      Cool thing about this boat which is not seen in the picture is it is completely sealed when running as the outboard obviously has no shaft through the hull. Only the 3 wires from the motor which sit high up well above the water line and go through the hull which I gooped a little silicone on to seal. Basically everything inside is waterproofed once the transparent cover is on and taped in place which is really easy as all surfaces are flat and easy to apply tape to. Been using 3M Blenderm tape which is the best tape bar none to waterproof any boat. See picture below.

                      Esc cables are stock length to motor cable stock length on 3.5mm bullets. There is a 4" extension between them. ESC is way overkill but I have a bunch of these so might as well put them to good use.

                      The hull is only 24" long yet there is plenty of room inside as you can see. Heck I even have my GPS in there. Amazing how much more room there is when there is no motor or drive system inside.

                      Last edited by Snowride; 09-28-2013, 08:50 PM.

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                      • tlandauer
                        Fast Electric Addict!
                        • Apr 2011
                        • 5666

                        #12
                        Thank you very much, I had been dying to get all this info ever since some of us noticed this boat on the HK site.
                        Ever since I bought a converted VS-1 and then I converted a TS3, I have been bitten by the tunnel/hydro bug.
                        Too many boats, not enough time...

                        Comment

                        • Snowride
                          Senior Member
                          • Sep 2010
                          • 297

                          #13
                          They even sell the same outboard here at OSE along with the flex cable. http://www.offshoreelectrics.com/sea...man=&x=43&y=11

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                          • Snowride
                            Senior Member
                            • Sep 2010
                            • 297

                            #14
                            A good friend of mine has the 7600 mah packs which I will borrow for a run. God knows this thing needs a little more weight up front so this will help in that department as well as increase the run time to maybe 15 minutes. These are the packs. http://www.hobbyking.com/hobbyking/s...o_E_Maxx_.html

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                            • er8sr
                              Senior Member
                              • Apr 2013
                              • 183

                              #15
                              Snowride you running the mini outboard on 4s?

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