Electric Flight Specialist since 1999

"How do I decide which motor/battery to use in a model?"
The simple answer is, calculate the power needed (watts), to fly the model (weight in pounds/kg) in the way you would like it to fly.  If this sounds complicated, trust us, it isn't!
There are many other factors which could be taken into account but we don't want to do that,

"How do I calculate the power being produced by a motor "By multiplying the voltage (V) of the battery pack by the current drawn ( I ) from the pack you have the power (Watts) going into the motor. Of course this is input power and the actual power out is dependant on the efficiency of the motor, but for simplicity most people use the input power when calculating power required for a given model. The simplest method of measuring the voltage and current is to use a "Watt meter" this invaluable device calculates the watts and allows you select the correct components for your power train. Without this ability you do not know if the battery / motor / controller are are operating within their respective limits.

"How much Power is required to fly the way you want?"   It takes about 30 watts per pound of aircraft to stay in the air.  40 to 50 watts per pound are needed to take off from a grass field  or (ROG) rise off ground. With more than 60 watts per pound, you will be aerobatic if the airframe is capable.  At 100 watts per pound and above, full aerobatic performance is possible.  Motor efficiency is getting better with advances in technology so less power is required if using brushless motors.

More answers being compiled! Please ring if you require help.