Here is some basic information about choosing electric power systems for model aircraft.
This applies to inrunner and outrunner motors unless otherwise stated.
The inrunner brushless motor first came into prominence in the late 1990s. They were expensive, powerful, of relatively high Kv and so usually needed a gearbox to work for a model airplane application.
For model helicopters, with built in reduction gear systems, they were ideal.
The cost aspect was the biggest obstacle to general acceptance of the new style of motor.
Manufacturers began to think outside the box, and Hacker in Germany created some of the first outrunner brushless motors in the early 2000s.
Many others copied the design, and the brushless outrunner became the sport flier’s choice for electric powered aircraft.
Because the outrunner style of motor, even in the smaller diameters, made it possible to get more magnetic poles and turns on the stator, and so reduce the Kv of the motor.
By reducing the Kv it became possible to turn a larger prop and so produce large amounts of thrust on relatively low voltage.
What’s in a WATT?
As the power of a gasoline engine is measured in horsepower (HP), the electric motor industry in general uses either ‘fractional horsepower’ or Watts to express the power of motor.
There are 740 Watts in 1 horsepower, so it is obvious that MOST of our model motors are in the fractional range.
Most manufacturers are conservative when rating their motors for a...Continue Reading
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Born in England. Emigrated in 1976 after serving 14 years in the Royal Air Force as an Aircraft Electrician and Flight Simulator Technician on Harrier Aircraft.
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Electric Launch Sailplanes
Retired from THREE differnt career, First in the Royal Air Force, Then Electronic Engineering, and lastly as a Methodist Minister.