How about this with an Arduino thrown in as and ECU should be able to deliver around 3.5 HP on 24 Volts. Two 75 Ah batteries should give around 20-30 minutes range at full throttle, much more at lower speeds.
Some belts and pulleys
Batteries 2 off
Turnigy AquaStar T20 3T 730KV/1280KV Water Cooled Brushless Motor
Features:• Dual Configuration Allowing for 730KV or 1280KV Operation
• CNC Machined Billet T6 Aluminum Motor Can
• High Purity Copper Windings
• Powerful Sintered Neodymium Magnet
• Precision Engineered for Maximum Energy Conversion
• Water Cooling Jacket Pre-installedSpecs:
RPM/v: 730kv @ "Y" config. / 1280kv @ "?" config.
Max voltage: 41V (11S)
Max Current: 128A @ "Y" 730kv / 229A @ "?" 1280kvMax Watts: 5280w
Resistance: 0.0132ohm @ "Y" 730kv / 0.0046 @ "?" 1280kv
No Load Current: 3.2A @ "Y" 730kv / 4.2 @ "?" 1280kv
Can Diameter: 56mm (actual motor diameter) Can Diameter inc. Water Jacket: 63mm
Length: 102mm
Shaft Size: 8mmWeight: 971g
• CNC Machined Billet T6 Aluminum Motor Can
• High Purity Copper Windings
• Powerful Sintered Neodymium Magnet
• Precision Engineered for Maximum Energy Conversion
• Water Cooling Jacket Pre-installed
RPM/v: 730kv @ "Y" config. / 1280kv @ "?" config.
Max voltage: 41V (11S)
Max Current: 128A @ "Y" 730kv / 229A @ "?" 1280kvMax Watts: 5280w
Resistance: 0.0132ohm @ "Y" 730kv / 0.0046 @ "?" 1280kv
No Load Current: 3.2A @ "Y" 730kv / 4.2 @ "?" 1280kv
Can Diameter: 56mm (actual motor diameter) Can Diameter inc. Water Jacket: 63mm
Length: 102mm
Shaft Size: 8mmWeight: 971g
Turnigy Marine 180A Brushless Boat ESC
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Programmable settings;
Reverse
Low Voltage (none/2.8v/3v/3.2v/3.4v)
Brake: (none/soft/hard)
Timing (0.00/3.75/7.50/11.25/15.00/18.75/22.50/26.25)
Constant Current: 180A
Burst Current: 360A
Resistance: .0007ohm
Battery: 2-6S Lipoly
BEC: 5.8v/ 3AMotor Type: Sensorless BrushlessSize: 72 x 68 x 34mmWeight: 165g
Reverse
Low Voltage (none/2.8v/3v/3.2v/3.4v)
Brake: (none/soft/hard)
Timing (0.00/3.75/7.50/11.25/15.00/18.75/22.50/26.25)
Constant Current: 180A
Burst Current: 360A
Resistance: .0007ohm
Battery: 2-6S Lipoly
BEC: 5.8v/ 3AMotor Type: Sensorless BrushlessSize: 72 x 68 x 34mmWeight: 165g
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