HI Cliff, the watt meter is sound advice, I have one that does battery testing as well, the spec shows 120a continuous with a surge of 720a, as a minimum your ESC needs to be 150a, better would be 200a, with a fuse to protect the overload, log in on ebay and type brushless esc 200ah watercooled, at that sort of power the ESC will fry, without cooling.

Hi I peek the motor and speed Controller can you all tell me if its the right speed controller for the motor r not? heres the Specs:Turnigy AquaStar 4084-620KV Water Cooled Brushless Motor
RPM/v: 620kv
Winding: 2.5Y
Max voltage: 37V (10S)
Max Current: 105A
Max Watts: 3050W
Resistance: 0.03ohm
No Load Current: 0.7A
Can Diameter: 39mm (actual motor diameter)
Can Diameter inc. Water Jacket: 49mm
Can Length: 84mm
Shaft Size: 5mm
Weight: 508g
Motor Connector: 4mm bullet plug
and heres the Speed Controller im going for
Specs:
Voltage input: 26 LiPoly cells (618 NiMh)
Continuous Current: 120A
Burst Current: 720A
BEC Type: Switching with on/off switch
BEC Output: 6V@5A
Motor Connectors: 4mm
Servo lead: JR style
Servo Lead length: 300mm
Water Cooling Pipe: 3mm I/D~5.4mm O/D
Dimensions: 68.5x39.4x32mm
Weight: 160g
many thanks cliff

Hi Clifford
I suggest you invest in a Wattmeter and measure the actual current and wattage your motor and prop draw. As already said you do need a battery and ESC that capable of supplying the max current. However the choice of prop will determine the current drawn and if it exceeds the spec for the motor/ESC or battery you will have problems. Reducing the prop size and pitch will bring the current down.
Water cooling is almost certainly a requirement and with very high wattages you may well need two feeds. I have a club member who is into fast electrics and he seems to manage with a single cooling supply, but he does use some state of the art kit and achives about 47mph.
Good luck
Dave

or use a dual pickup and water cool each independently.

http://www.performancemodels.co.uk/product/aluminium-water-pickup-flush-type-dual/


http://www.performancemodels.co.uk/product/aluminium-rudder-large/

Look at the amp & lipo cell rating for the motor. Then at least equal or exceed that. Above a certain rating it will be water cooled also. in that case not sure which way the water should flow first. Probably the ESC. Others may disagree.

Got a stuck key jarvo???? laughs

looking at the reports of that ESC I think you may well need one with a higher rating

http://pcguys.org.uk/index.php?route=product/product&product_id=319

expensive I know but if your going to play around with high Amp motors everything else needs to be uprated as well.

HI Clifford, have not looked at the spec of the motor, but, would suggest looking for the match on the hobbyking web site that will match to the motor, Mark

HI Clifford, have not looked at the spec of the motor, but, would suggest looking for the match on the hobbyking web site that will match to the motor, Mark

since you have a hobbyking motor why not use their recommended ESC.

http://www.hobbyking.co.uk/hobbyking/store/__45159__Turnigy_AquaStar_160A_Water_Cooled_ESC_UK_Warehouse_.html