1 mm = 100 cm 1 m = 100 cm 1 ha = 10,000 m Speed, V = Distance / time 1 hour = 60 min 1 min = 60 sec 1 hp = 0.75 kW 1000 L = 1 m 1 L = 0.001 m Theorical Field Capacity (TFC) v (km) x w(m) 10 km x W (m)x F.E hr Efective Field Capacity (EFC) Field Efficiency (EF): 10 Effective Field Capacity (EFC) Theorical Field Capacity (TFC) x 100 Drawbar Power (kW): Force (kN)x speed(km/hr) Metric Unit 3.6 Torqe(Nm)x N(rpm) PTO power (kW) = 9549 PTO Hp PTO HP Width = x 0.86 Engine Hp DrawbarHp 0.86 Draft (kN) kN Draft m Power loss Accessories Ambient Temperature Altitude 10% other than fan 5% fan and radiator 1% or each 5.6C above 29 C - Gasoline engine 1% or each 2.7C above 29 C - Diesel engine 3% for each 305 m above 152 m Type of service 10% for intermittent loads 20% for continuous loads