Mini Quad Motors: 2306 vs. 2207 Stator Size

The differences between 2306 and 2207 mini quad motors are often discussed. In this article I will share my understanding and experience to help you pick a suitable motor size for your next quadcopter build.

To give you a little technical background, the numbers 2306 and 2207 are the different stator sizes. The first 2 digits are the stator width, the last two digits are stator height.

Further Reading: How to choose Mini Quad Motors

2306 is wider but shorter, while the 2207 is taller but thinner.

It’s hard to find 2306 and 2207 motors of the same construction, features and material to make a fair comparison. This article is based on my experience with the motors I have flown with, and feedback from many pilots I’ve talked to.

Theoretical Differences between 2207 and 2306

Stator Width & Height

2207 has a narrower stator width, results in a smaller rotational inertia that allows for faster RPM changes. The taller stator creates a larger “surface area” and increases magnet size, therefore it can cut through more magnetic field.

Compared to a 2206, 2306 has a wider stator which increases the stator volume and coil size more than the permanent magnets. This makes a more torquey and efficient motor.

Stator Volume

2306 and 2207 motors have different dimensions, hence different stator volumes:

  • 2306: (23/2)^2 x 3.14 x 6 = 2491.59
  • 2207: (22/2)^2 x 3.14 x 7 = 2659.58

The 2207 motor has 6.3% more volume, so it’s normally heavier than 2306. For example, the Dragonfly Hurricane 2207 is about 32g while the Brotherhobby R5 2306 are about 29g.

Assuming all other variables are equal, 2207 would have more torque since stator volume is a factor of motor torque.

It’s impossible to say definitively what performance you will get on a 2306 or 2207 motor, because it hugely depends on the design features and material used. Things like the amount of copper, type of magnet, air gap, stator lamination etc, all play a part in the performance of a motor.

But purely based on the different stator sizes, the general impression is that 2207 has more top end power and can change RPM more effective in high throttle range, while 2306 gives you more low end throttle response and resolution.

Real Life Experience

The differences between 2306 and 2207 are very subtle but you can tell they are different if you fly them long enough.

2306 has better power and response at the low and mid throttle range, but missing the power you would expect at top throttle. 2207 has a more linear power to throttle curve, and it really pops at higher throttle.

These motors also seem to change my flying style a little.

With the 2306, I really enjoy cruising and flying close proximity thanks to the extra throttle response I get around 30% to 70%. When flying 2207 I can’t help myself doing more acrobatic moves and my flights were more dynamic.

On many motor thrust tests you can see 2207 typically draws more current at max throttle and tends to be less efficient than 2306. But that doesn’t necessarily mean it will impact your flight time by any noticeable amount since we don’t pull full throttle a lot in real flights.

Should I Choose 2306 or 2207 Motor?

For beginners, I really don’t think the differences are that noticeable. There are some other influential factors when picking a motor like the construction of a motor, design features, user feedback/reviews etc.

For more experienced pilots, you might notice the subtle differences and IMO the decision comes down to your flying style and setup.

If your style is more dynamic and acrobatic, 2207 might be a better choice because of the awesome top end power. 2207 is also favoured in racing due to this reason.

2306 is a little bit more “gentle” IMO, and it’s great for those who prefer smoother freestyle. The excellent low end control would also work great for tight race courses.

Whichever motor you choose, beware that it will impact your prop choice too. 2306 should handle aggressive props better than 2207. It might be able to handle it, but it might draw more current and be less efficient.

The weight of the quad also plays a big part. From my observation, 2207 is a lot more popular for lighter mini quad (below 350g dry weight?) while 2306 is more often used on a heavier rig.

Motor Recommendations

I really like the Dragonfly Hurricane 2207 for its value, and the BrotherHobby R5 2306 for its performance.

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