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[ormer]

hi all
i am struggling i have built a 36" multi hull known as a monza
i have a submerged drive in it tried with a 35 mil prop and running a 3505kv brushless motor
and have completely blown almost caught fire 2 speed controllers
1 was a mystery 80 amp water cooled speed controller
2 was a jeti hacker navy 3 opto 99 i believe (cant read as it in cinders)
both times i was running 12 cells
any ideas before i rip it out and stick either a bbturbo 12v
or a 8.4 v bb turbo
both times motor has also been water cooled and boat has been completely dry so know leakage letting in water and water cooling working properly
many thanks in advance 

[dougal99]

Please don't be insulted.

Were the speed controllers designed to work with brushless motors?

[ormer]

ye they were
not insulted

[Stavros]

Hi what make is the brushless motor and a silly question really BUT when you bought the motor did the seller reccomend a speed controller at all


Stavros

[ormer]

hm the motor is a purple one from hong kong no name on it and they say it was rated for 80 amps so that is what i had in it to begin with then the jeti hacker much bigger but still almost caught fire evrything was water cooled motor and esc

[nick_75au]

May be a bit late in the piece but you need a lower kv motor or gear the high kv motor, Ive got a smaller 3200 kv outrunner motor on a gearbox and 35mm prop on 10 cells no water cooling on motor and 40 amp speed controller water cooled but barely needs it.
or use a smaller prop.
Regards
nick