Abstract: An apparatus for controlling an electric motor in a motor-assisted, pedaled or hand-cranked vehicle includes a processor adapted to calculate a value for the net opposing force acting on the vehicle; a vehicle speed sensor, an accelerometer to measure a component of vehicle acceleration in a direction of travel of the vehicle, an air pressure sensor measuring air pressure in the direction of travel, a sensor that measures the power output of the electric motor, and a power assist processor that calculates an amount of power to be supplied by an electric motor according to measured values for speed, acceleration, air pressure, and power provided by a person riding the vehicle.

Abstract: An apparatus is disclosed comprising a suite of sensors for measuring instant static and dynamic pressure, speed of the water flowing past the vessel in the direction of travel of the vessel, acceleration of the vessel in the direction of motion, and position of a vessel, such as a row boat. A microprocessor receives data from the sensors and calculates power expended by the rower, paddler, or other human or non-human power source by finding the total of all forces impinging upon the vessel and passengers, thereafter multiplying by the speed of the water flowing past the vessel in the direction of travel of the vessel. In one embodiment data is stored for later analysis or for downloading to a computer or other data storage device.