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[sabre]

My winter project but the world of brushless motors is like getting lost in fog as I've  no  experience of them.   The last time I built an rc boat was decades ago and it had a 10cc turning a 50x prop.So, what motor do I require for this old thing.  50" length and 18" wide catamaran hull and by the look of it there was an ic engine at one time and maybe even an electric at some point.   Eyewatering speed is not essential, just a good turn of speed.

[Subculture]

Some tips on a 10cc brushless equivalent. You'll need something fairly chunky for a boat that size.

https://forum.flitetest.com/index.php?threads/10cc-like-brushless-motor-help.32222/

[chas]

Have a look at the various posts about electric sea queens, any motor used in them should be fine for you. Dont be afraid of brushless motors, they're simple to use and install, just one extra wire.

[Backerther]

Hi
It may be a bit nervous and delicate point to choose an adequate size of motor.
I also made quite the same experience on that point and finally decided the motor from the viewpoint of output power.
My original specifications of The Jupiter F-99(40" long) was powered by Enya 60 2st IC engine with 1.45HP.
Happening to find a brushless motor water-cooled with an output of 1200watt(1.6HP), KV2200, I soon purchased it
without hesitation.!!   The screw prop is 46mm dia, two bladed that has been working nicely up to today.

See the video how actually the newly born boat sailed. I am satisfied with this level of sailing performance.
Jupiter F-99 at speed in the spring sailing for 2022 - YouTube      .......This is a bit fast version.
My Jupiter F-99 sailed calmly in a very fine day of May. - YouTube......This is slow speed version.!!

1; I removed the Enya 60 IC engine together with a steel plate mount from the bed.
2; And I installed the brushless motor of the above.
3; 46mm dia prop.  The original spec was 60 dia. prop two bladed with the IC engine.
4; The newly born Jupiter F-99 with the brushless motor ran like this really scale like speed. Not so fast, not so slow!
5;　This is just an addition.

Good luck with your challenge to the brushless motor conversion project.!!

[sabre]

Thanks for the replies everybody, it looks like I'll be spending the rest of the night looking at large brushless motors.  Nice photo on flat calm water, looks really good.