Re: Trex 450 motor upgrade Q

I used to run a 2221-8 on a hobbywing 40a platinum esc and now a 450mx on an align 35a esc.

I think that the scorpion is a bit less powerful but i remember getting much longer flight time and it was more consistent power (on 90% throttle youll only get 2.45 out of the 450mx). Out of the two id definitely choose the scorpion.

Dont know anything about the esc sorry.

I managed to find this on the net which show that a 35A ESC wouldn't be useful for any of the 2221 range:


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HK-2221-6, Kv = 4400, Pmax = 525W, Imax = 50 Amps
HK-2221-8, Kv = 3595, Pmax = 475W, Imax = 45 Amps
HK-2221-10, Kv = 3000, Pmax = 440W, Imax = 42 Amps
HK-2221-12, Kv = 2500, Pmax = 400W, Imax = 38 Amps

These motors are by far the most popular ones in the 22mm series. They are designed to provide the maximum performance in 400 to 480 size electric helicopters. Because these motors are so popular, we will spend a little more time here giving specific application notes on each one. In addition to use in Helicopters, the HK-2221 series are also used very successfully in Airplane applications such as Pylon Racers and Hot-Liners that require a high power, high RPM motor. More recently, they have also become very popular for powering 65 to 75mm ducted fan units that are capable of utilizing a motor that is 28mm in diameter. For the purpose of this article, we will stick to Helicopter applications.
For operation on 3 Li-Po cells, there are 3 different motors that can be used, the HK-2221-6, -8 and -10 models. The most versatile model is the HK-2221-8 motor. This motor can utilize a wide range of pinion gears, and this allows the motor to “Grow” with the pilot as their flight skills improve from beginner up through moderate 3D type flying. Here are some common applications of the HK-2221-8 motor. These numbers assume a main gear with 150 teeth, which is very common for the 450 size machines.

HK-2221-8 with an 11 tooth pinion, providing a head speed of around 2800 RPM: This is good for entry level flying, hover practice and basic aerobatics
HK-2221-8 with a 12 tooth pinion, providing a head speed of around 3050 RPM: This is good for advanced Sport flying and beginning to intermediate 3D Flight.
HK-2221-8 with a 13 tooth pinion, providing a head speed of around 3300 RPM: This gives enough power for just about any 3D maneuvers, but still allows the use of a 20C 2200mah battery back, without pulling too much current.

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