How to pick the correct geared motor?
First look at the motor suggestion from the plane's manufacturer.
- Use HG2015 series; if the plane calls for 280, 370-size geared motor, GWS 100/300/350 series gear motor or B20S type brushless motor.
- Use HG2025 series; if the plane calls for 370, 380, 400, 480-size geared motor, GWS 350/400 series geared motor or B20L type brushless motor.
If you already know the weight of your plane, here are some quick guidelines to select the right geared motor.
- 3-D Aerobatic Airplanes -doing a lot of hovering - the thrust should be about 150% of the take off gross weight.
- High Performance Aerobatic Airplanes - the thrust can be between 75% and 100% of the take off gross weight. For example, if the
gross weight of the plane is 300 g, your thrust needs range between 225 g and 300 g. You have plenty of room to tailor your thrust weight ratio.
Use higher thrust for performance and lower thrust for duration.
- Sport Airplanes- 50% thrust to weight ratio will give you good flight performance and duration. Really? Only 50%? Yes, the thrust to weight ratio
of Boeing 747 is around 35%. It is the lift generated by forward speed that suspends the airplane in the air.
What about gear ratio? Remember Himax gear motors come with 6.6:1 gear set installed. This is probably the
most common one to use. However, we also include the 5.3:1 and 4.4:1 gear sets for you to swap. Installation is very simple. Use the
performance guide below and play with the propeller combination to select the optimum setup for your plane. |
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