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[pintheair]

hi guys, iv'e got a 52" beachcomer sports boat,   ply buillt,   26cc marine engine (3hp)   58mm mocom prop.
weight about 12kg, runs and planes nicely,
been thinking about brushless conversion but what size motor and esc would i need?
any help would be good ,thanks

[nick_75au]

3 Hp is about 2200 watts, which at 12 volts is nearly 200 amps, this means a High voltage set-up is preferable, at least 24 volts, I would get at least a minimum 150 amp ESC and a motor like this.

http://www.hobbyking.com/hobbyking/store/__17707__XK5692_540KV_Brushless_Inrunner.html on 24 volts or 6S Lipo

or perhaps this 780 Kv version

http://www.hobbyking.com/hobbyking/store/__18854__T5692_Turnigy_Pro_Comp_Brushless_Inrunner_Motor_780kv.html

There are a few outrunner types that would work but the in-runner is easier to cool with a water jacket.

Do you know what RPM your getting,  This might help in selecting something.

Cheers
nick

[pintheair]

ta v much for quick reply nick.
had a look at giantcod  here , would these be ok?
 
Keda KB45-11L 1649kV 70A Brushless Inrunner
 
RC Max 120amp Boat ESC
5C CWatercooling Jacket for KB45 inrunner
5c charge Loong Max 4000mah 6S 20C Tipple Lipo Battery
thats about £140 over here. could be an  interesting new project,
 thanks bud.       pierre

[nick_75au]

Not enough power and way to high Kv.

If you want a comparison the US guys are putting these in 47" boats that weighs 8-9 Kg's

http://www.castlecreations.com/products/2028_motor.html

 they run 10 cells with surface piercing props

On 6 cell would be good for the subsurface Mocom prop.

Nick

[martno1fan]

A customer used twin t 600 outrunners 880 kv on 6s two hk 200 amp esc and she runs 50 mph easy.He has since changed to twin hi model 1100 kv motors because one motor got damaged when his battery came loose and hit one motor ouch.
Mart
http://www.youtube.com/watch?v=6g5ZfT-bQ70&lc=_qhQFbHkkJ4eIu5sEwa5yBQmy9TkaonXHMYXQYkdvCU&context=C34950f4ADOEgsToPDskLs2VJCSmUv6thAGFUjPjRy

motors,these are monster power and equally as good as leopard motors at less than half the cost.

http://www.hobbyking.com/hobbyking/store/__11143__Turnigy_T600_Brushless_Outrunner_for_600_Heli_880kv_.html

[MikeA]

are you working to a budget pintheair?



the motor that nick pointed runs at 6000w lol thats just over 8hp! :

http://www.hobbyking.com/hobbyking/store/__18854__T5692_Turnigy_Pro_Comp_Brushless_Inrunner_Motor_780kv.html

[nick_75au]

are you working to a budget pintheair?



the motor that nick pointed runs at 6000w lol thats just over 8hp! :

http://www.hobbyking.com/hobbyking/store/__18854__T5692_Turnigy_Pro_Comp_Brushless_Inrunner_Motor_780kv.html

See my first Post........ Oh yeah thats the same motor

Nick

[MikeA]

i know it is thats why the post says the motor that NICK pointed out 

[nick_75au]

Oh yeah thought you were pointing out the Castle motor, this was a while ago...

Nick