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Thread: AB Marine Intimidator Endurance Boat

  1. #31

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    Quote Originally Posted by Peter A View Post
    I have found from experience so far that 32% is the 'magic' number for CG.

    How is this measured? Length of hull, 30-35% total length from the stern?

  2. #32

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    Quote Originally Posted by DanInWV View Post
    How is this measured? Length of hull, 30-35% total length from the stern?
    Yes the measured length of the running surface. Some hulls have a big overhang at transom but that is not included in the measure. EG: if hull is 41” and has a 4” overhang then it is 30-35% of 37”

  3. #33

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    Ok, so after a few weeks of this boat sitting I have decided to get it ready for racing. It will be an oval racer for now, but it may be possible to use it for the original purpose later, we'll see.
    So a bit of placing and balancing and what was clear was that it would not work out the way it is to get CG right.
    So....
    Saturdays mission, tear it out and redo.

    Before.
    20190112_114609.jpg

    Gutted.
    20190511_133511.jpg

    End of the day.
    20190511_154609.jpg

    Now a few bits to do. I will make a tray for the rx and battery that will be removable but cover the stuffing tube, and I am waiting on some battery trays which I ordered on Friday and should see later this week.
    NZMPBA 2013, 2016 Open Electric Champion. NZMPBA 2016 P Offshore Champion.
    2016 SUHA Q Sport Hydro Hi Points Champion.
    BOPMPBC Open Mono, Open Electric Champion.

  4. #34

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    Done, ready for a run on Saturday and see how she goes.

    20190522_171151.jpg
    NZMPBA 2013, 2016 Open Electric Champion. NZMPBA 2016 P Offshore Champion.
    2016 SUHA Q Sport Hydro Hi Points Champion.
    BOPMPBC Open Mono, Open Electric Champion.

  5. #35

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    Woot, woot

  6. #36

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    Got it on the water Saturday, no issues with speed, temps and runtime for ovals, it corners well too. Just has a problem with getting really loose at speed, I think the drive line needs to come up a bit to settle the hull in the water. I will fit a flood tube and strut, but I will live with it for club day this coming Sunday.

    Screenshot_20190527-073222_RCM Telemetry.jpg
    NZMPBA 2013, 2016 Open Electric Champion. NZMPBA 2016 P Offshore Champion.
    2016 SUHA Q Sport Hydro Hi Points Champion.
    BOPMPBC Open Mono, Open Electric Champion.

  7. #37

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    Well the boat had it's first racing yesterday. Straight out and won the first two heats, second in the third and slammed upside down in the fourth for a DNF. That is against bigger gassers.
    That ticked me off as one boat tried to squeeze inside me when I was in lane one for the start, then cut across me for turn one and then his son cut me in turn 1 and I was out. Nothing like the same old people not holding lanes (basically cheating) to get in front! Fortunately no damage and the hatch seal works great.
    Rant over, I was pretty happy with the way it ran. I had changed the turn fins and readjusted the stinger and trim tabs. It only used 2400 mah for a race on an X452/3. Next is change out the stinger for a flood tube and strut so the hull will settle better at speed and I can run bigger props. There is more in this boat yet.
    NZMPBA 2013, 2016 Open Electric Champion. NZMPBA 2016 P Offshore Champion.
    2016 SUHA Q Sport Hydro Hi Points Champion.
    BOPMPBC Open Mono, Open Electric Champion.

  8. #38

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    Are you using a shaft oiler for these extended runtimes?

  9. #39

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    Quote Originally Posted by RayR View Post
    Are you using a shaft oiler for these extended runtimes?
    The original setup was grease, then changed to an oil cup with teflon liner due to heat in the stuffing tube. Heat=friction=power losses. The oiling system worked fine and was sufficient for 20 min runs. Now that the boat has been reset up for ovals I have gone back to grease.
    In my Osprey which I am using again for endurance racing, I use grease and have a spring loaded pressure pot I made which continually pushes grease into the stuffing tube as it runs. This works well.
    NZMPBA 2013, 2016 Open Electric Champion. NZMPBA 2016 P Offshore Champion.
    2016 SUHA Q Sport Hydro Hi Points Champion.
    BOPMPBC Open Mono, Open Electric Champion.

  10. #40

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    Update. I have fitted a flood tube and am awaiting parts from OSE (hopefully see them today or tomorrow) so that I can finish the strut conversion and hopefully test this coming Saturday.
    Will do some pics then.
    NZMPBA 2013, 2016 Open Electric Champion. NZMPBA 2016 P Offshore Champion.
    2016 SUHA Q Sport Hydro Hi Points Champion.
    BOPMPBC Open Mono, Open Electric Champion.

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