Electric Outboard

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-installed

Specs:
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

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

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