Model Boat Mayhem

Technical, Techniques, Hints, and Tips => BRUSHLESS Motors and Speed Controllers => Topic started by: mermod on March 28, 2012, 11:49:49 am

Title: johnson 785/700
Post by: mermod on March 28, 2012, 11:49:49 am
Just wondered if anyone knew roughly what a johnson or mabuchi 785 or 700 brushed motor would equate to in brushless?
Title: Re: johnson 785/700
Post by: essex2visuvesi on March 28, 2012, 11:52:01 am
inrunner or outrunner?
Title: Re: johnson 785/700
Post by: mermod on March 28, 2012, 11:57:59 am
It would be for a 700mm long tug so probably outrunner
Title: Re: johnson 785/700
Post by: 16-21 on March 29, 2012, 04:45:14 pm
Size of prop?
operating voltage?
Required rpm??

Title: Re: johnson 785/700
Post by: nick_75au on April 02, 2012, 10:45:36 am
Don't have the exact specs for those motors, but a
 RE 800 is about 800 Kv
 RE 850 is 485 Kv
Speed 900 torque is about 550 Kv
the slowest speed 700 is about 960 kv
Speed 720 BB torque is about 350 Kv

Maximum  watts are 157W for the RE850 all the others are sub 100w .

Nick
Title: Re: johnson 785/700
Post by: mermod on April 08, 2012, 09:39:39 am
Perfect, just what I needed, thanks nick :-))