RC BOATING SCALE BOATS Builds Scale Boats Electric Predators Double Trouble scale Archer 650 – 6.5m offshore Runabout -Rebuild

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    • #2600

      With Autumn here & winter fast approaching its time to start thinking about a winter rebuild project.

      My Archer 650 – 6.5M Offshore has been sitting around gathering dust since I stripped it down to paint two years ago.

      As most will remember the original build had the boat equipped with twin outboard motors powered with big Axial Rock Crawler brushed motors. It went well and looked great but there was never ending maintenance required on the Outboards due to running in & cooling with salt water.


      The second rebuild saw it equipped with twin inboard motors (same as above) but still salt water cooled. This went well and required only a flush of the cooling system with fresh water after every use to keep it all working. Even though this arrangement was a bit heavy on batteries I intended to stay with it and to that end the boat was stripped down for painting & finishing.


      More Archer 650 build pics here

      Before I got around to it the Aquacraft Rescue 17 came along and when upgrading that (with grateful input from UncleG), I opted for an air cooled brushless motor & ESC, which works a treat and uses a lot less power.


      To that end I have ordered two more of the Turnigy D3548/6 790kv motors & two HK 2s-4s-60A (w/reverse) air cooled ESC’s. May need to modify the motor mounting tray slightly but that shouldn’t be an issue with the 3D printer on hand to manufacture whatever is needed.

      More to follow.


    • #8674

      Gee, its 4 years since I started the refit on the Scale model Archer 6.5M Offshore.

      All the upgrade bits have been laying around gathering dust for a long time so I guess this will be the next cab off the rank after the “Badger II” (Mt Gay 30) is finished.

      At this rate I’ll be dead & buried before I get back to the half finished A Class Wizzle Wozzle.  My how time does fly.

      • #8677
        Uncle G

        You can’ rush these things Mike!

    • #8678

      Your doing a great job Pred. Even if some projects are on the back burner you are well occupied with your current toys. I have lost all interest in my hobbies over the past few years, hopefully I will get back into it sometime. You guys seen the sun lately. Been a pretty miserable winter over here. Granted  probably more like summer to some in the world but unusual for over here. Have followed this project since its inception on SS and now this forum, look forward to the next chapter.

      • #9001

        Sorry about the late reply Tug, to be honest the weather over winter so far (apart from the last week) has been pretty decent for winter. We haven’t been missing too many flying or sailing trips and most days I still manage a 3k or 4k walk with Pyro.

        He does like a nap in sun when we get back though.

        Anyway looks like the “Double Trouble” project is back on track – well for a little while anyway.

    • #8994

      Today it’s time to start again on “Double Trouble”

      I have finally managed to source the correct universal joint couplings (5mm x 4mm) to connect the new brushless motors to the propshafts.  No doubt they will take a few weeks to arrive from downtown China so in the meantime I’ll remove all the watercooling pickups & outlets that were fitted to cool the brushed motors that were fitted when the Outboards were first removed.


      The brushless ESC’s are aircooled (fan assisted) and the motors are so oversized that they barely get warm so no additional cooling is required.

      Inlet & outlet pipes have been removed so next job is to fibreglass all the holes then the bottom of the hull & the rudders can be painted.

      Also need to manufacture a timber stand for storage & display purposes.

    • #9000

      After a fair bit of hunting around to find all the bits & pieces (after all it is 4 years since she was stripped down) the work is finally under way.

      Cooling tube holes have been epoxied over and had a light coat of spot putty applied so the hull is now ready for paint preparation.  After another quick rub down & tidy up, a coat of primer followed by spray putty on any rough spots then a final primer and several top coats.

      I was going for deep blue originally for the underwater area but as I have black in stock methinks it may end up black below the waterline.

      Motors & ESC’s have been temporarily installed and the alignment looks OK. Once the drive couplings turn up final alignment can be set & the electronics permanently installed.


      I’ve opted to install the ESC’s in the cabin area (below floor level) so there is plenty of room in the rear for batteries & video gear etc.

    • #9006

      I dont believe it after all this time

      May the repair gods be with you

      • #9007

        Yes Moose, its finally underway again.

        Whilst this winter has generally been fairly mild it has knocked me about a bit health wise.  At least it’s got me motivated to get all these outstanding projects finished while I’m still upright !!

        Still got 3 more yachts to finish once this is done, the 1/5 fuelie Dune Buggy still needs the clutch fixed before our next West Coast trip, the Drift Car needs a rebuild & the list goes on.

    • #9008

      After walking the dog it was time to get a bit more done on Double Trouble today.

      Motors & electronics were removed (yet again) just to make life a little easier.

      The lower hull was then spotted, sanded and cleaned (several times) ready for primer tomorrow. I will only need to paint to the waterline as the gel coat finish on the rest of the hull is very good and after a bit of effort cleaning today she looks like new.

      In between spotting & sanding I managed to get some of the vinyl lettering done (to replace the paper signs that have been in place temporarily  since August 2013 – not bad for paper, ink-jet printed & covered with clear tape).

      First time I’ve tried double printing (two colours) and whilst it came out OK it really was a lot of fiddling to get right .


      The Blue & the Black Shadow – cut separately

      Colour overlaid on the shadow – ready to apply

      Ah, the joys of modelling.

    • #9009

      Starting to look the part A job well done mike

      • #9010

        Thanks Mr Moose, I’m on a bit of a roll at the moment & its going well.  Hopefully I’ll get it masked up tomorrow morning then get the paint on when I get back from visiting the Covid Clinic for my second AZ shot.

        If painting doesn’t happen tomorrow then it will need to wait till Friday as hopefully we are all flying on Thursday.

        I am assuming we will see you @ the field on Thursday with your collection of planes.

    • #9082

      Still plodding away with Double Trouble.

      Got the hull primed last week , also got the display stand built.

      Today the topcoat went on the underwater area.

      I’ll give it a day or two for the black to harden up then a quick cut & polish of the whole hull below the gunwales, add the signage, rudders & props and that will be about the extent of it for a few weeks till the drive couplings arrive.

      I’ll need to get the stand for this & Badger II epoxied as well, soon as we get a nice warm day.

    • #9083

      Looking good Mike you wont know what to do with yourself soon or am I fooling

    • #9084

      Still got 2 x Victoria RC yachts & the Wizzle Wozzle A Class to finish + some minor repairs on the N12 yacht. Then the Mystic 32 Offshore Racer is still waiting for repairs from where it hit the old (yes, old) jetty @ the canal.

      Don’t think I’ll run out of projects ant time soon.

      But at least the list is getting shorter !!

    • #9139

      Driveshaft couplings arrived early from downtown China so the motors are now installed ready for the first on water test run.

    • #9140
      Uncle G

      Where’s the differential thrust steering mix?

      You will need that to get out of Kermit’s way!

      • #9141

        With the big rudders I should not need differential thrust, however it’s easy enough to add if necessary.

        I’ve just bodged it together to see how it performs with the new motors. Once I know it all works correctly then fancy bits can be added.

        You know you can’t rush these things !!

    • #9179

      While “Double Trouble” is still far from finished it is a least now sitting on it’s own display stand and it is all fully functional ready for on water testing.

      Just want to make sure it runs as expected with the new brushless setup and that the steering is satisfactory.

      One of the props is badly out of balance so will either need balancing or I may need to replace the pair if they don’t match up with the new motors.

      I’ve left the Hardtop off for this first round of tests but eventually it will go back on once the interior is all tidied up.

      May get a test run this Saturday if the weather is favourable.




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