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Engines for Airplanes & Helicopters

In general, 2 different types of motors are used: brushed and brushless.

Brushed motors are usually less powerful but can immediately switch between driving forward and backward.
Brushless motors are more powerful and often better resistant to dust, but this does come with a higher price.

To decide which engine you need, there are a number of things to take into account. For both engines you first choose an engine size, this is the number after the brand name in the title (E.g. Injora 540 13T-80T Brushed Motor 1/10 of Ignore 3650 3600-5200KV Brushless Motor). The higher this number, the more powerful the motor. Be sure to check the dimensions in the description to make sure this engine will fit.

Brushed motors have turns, this is indicated in the titles (E.g. 20T). The higher the turns, the slower the motor and the higher the torque. So if you're going for top speed, a lower turn rating is recommended.
Brushless motors have a KV rating, this is also indicated in the titles (e.g. 2000KV). This works approximately the same as the turns on a brushed motor, but reversed. The higher the KV the more top speed, the lower the KV the more torque. Higher KV motors often require slightly more cooling.