setup advice for twin drive 55" scarab

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  • befu
    Senior Member
    • Aug 2009
    • 980

    #1

    setup advice for twin drive 55" scarab

    Got a question from someone who looked at a 55" scarab and wondered what it would take to setup one as a fast scale twin. Now, this is non race, but still a fast boat. Is it possible?

    Boat, 55" scarab, strong but not a heavy hull. Most of the weight will probably be batteries.
    Drive: Will be twin drive, counter rotating using a steerable surface drive with a flex cable setup.
    Wondering what it would take to get it to burst up to mid 50's?

    Props: Would octura 447 props surface drive push a hull like this? I tend to think twins would. If using 447 props, a loaded rpm of about 30,000 rpm would work. that is 10s at 1000 kv or 6s at 1650 kv.

    A gas engine would push this boat with about 5hp to this speed, so going twin will require more total power as well as a heavier weight. Maybe 5000 watts total? Am I close here? On 10s that is about 70ish amps, or 6s that is 120 amps on each motor.

    Anyone with experience with a boat this size or power curves. I know a boat like this is some good coinage, but wondering if a couple of nice outrunners would push this (like the old little screamers).

    Brian
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