Size ESC Needed
 

Have a 29 inch hobby boat that I put two 550 , 17 turn, 4100 kv motors brushed motors in. Has 35 mm props. Looking all around the net and forums for formulas, etc, to figure out what amp size brushed esc I should be getting. Anybody have some info or formulas for calculating max amps? Thanks

(no comments please on going brushless - brushed motors ar in to stay until they burn out)

Oops forgot - running 8.4 volt NIMH 3000 battery.<br type="_moz" />

RE: Size ESC Needed
 

Anybody? Not looking for exact answer. Restated: about how many amps(50 - 100- 150-?) will a couple of 550 size (4100 kv/8.4 vNIMH) in light plastic boat pull at steady run full throttle. Thanks in advance.

RE: Size ESC Needed
 

ha, just read this over on offshore. Check your answer over there. I believe they are saying a 90 amp speedo would be good. If you expect to pull 50 amps i wouldn't get a 60 amp speedo for a boat. Since you will likely be using full throttle a lot, 10 amp head room isn't much.

Can i ask why brushed? Is this stuff you already had? The worst brushless motor would probably be better then the best brushed motor in my opinion.

RE: Size ESC Needed
 

Already have the motors and mounted. Its a 42 dollar boat that I don't want to put much money in. Popped the esc that came with it on initial run and therefore the search. Going to purchase stuff that I can use later on when I deep six this one. Thanks for the reply.

RE: Size ESC Needed
 

Be mindful that if you buy a brushed esc it will not work with brushless motors when you come to update.

RE: Size ESC Needed
 

Go to Offshore and buy the 700 and be done with it and use a 60 amp esc and get a couple of 3.5 lipos in parallel and a 440 prop and have something.