Review: Sunnysky Edge Racing R2305 R2306 Mini Quad Motors

by Oscar

The Edge Racing R2305 and R2306 – latest line of motors from Sunnysky recently arrived on my bench. In this review we will take a look at the quality and features of these motors and then test them on a mini quad to see how they perform.

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These new Edge Racing motors look absolutely gorgeous, with a semi matte blue finish on the motor bell, and shiny silver motor base. The motors are very well machined with excellent quality, there is no vertical play in the bell at all.

The Sunnysky Edge Racing R2305 and R2306 both have 23mm wide stators. The wider stator seems to be a new trend in mini quad motors as we have previously seen in the Emax RS2306 on our blog. The wider stator should in theory increase the torque in the motor especially at lower RPM and improve responsiveness. I asked for a lower 2300KV version, so hopefully they should be more efficient yet powerful on mid-heavy 5″ props.

It’s using C-Clip on the bottom of the motor.

Air gaps are super tight, almost look like the magnets are touching the stator. But the motor spins very smoothly by hand so there is no problem.

A close look at the copper wire wildings. And also notice the “gripping surface” on top of the motor bell, where propeller would rest on. It helps to hold the prop tighter, a nice touch indeed.

Features of these motors

  • Wide 23mm stator
  • Curved N52H magenets
  • Super tight air-gap
  • 0.2mm stator lamination
  • hollow shafts
  • C-Clip

There are 2 versions available of different stator heights – the R2305 and R2306. Sunnysky told me the R2306 is simply designed to provide more power than the R2305.

It’s actually pretty hard to tell the difference when sitting both motors side by side, the R2306 is slightly taller, maybe (R2306 on the left, R2305 on the right). But apart from the height and label they look almost identical.

I think they might use the same shaft (with the same length), the shaft sticks out from the bottom a little bit on the R2305 (on the right).

The Edge Racing motors seem to be on the heavy side comparing to other motors of similar stator size. The R2305 weighs at 32.8g (T-Motor F40II – 28g), while the R2306 is 36g (RS2306 weight – 35g)

The R2305 Motors will be available in 2300KV, 2480KV and 2800KV, and the R2306 will be in 2380KV and 2700KV.

Right now, I think they could improve from the following:

  • Provide 2 sets of screws for 3mm and 4mm frames, currently there is only 1 set of 5mm M3 screws
  • Just go with CCW prop shaft threads, nylon lock nuts are strong enough to hold props in place; with both CW and CCW motors only confuses users (definitely me)

Sunnsky mentioned these motors are in mass production currently, but I don’t know when they will be available, but as soon as I hear I will update this article.

Motor Testing

I didn’t have much luck with the 2306 motors, one of the motor developed some bearing issues after one or two flights. Problem reported to Sunnysky hopefully they can send me a couple more to further test.

However I love the 2305 version, flies so smooth and have been holding up well after about 20 packs now.

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Ashade 17th November 2017 - 5:22 pm

The main reason for coming back to just one threaded direction is reducing manufacturing and stock cost. Same thing with doing four motor packs. I didn’t say it was only you, I said you were promoting it from your privileged position in the community, and honestly, the lack of options only hurts customers, most definitely not the manufacturers. It’s clearly a regression.

Ashade 12th October 2017 - 11:45 am

You mean just CW threads but… Why encouraging that? There’s a clear advantage to having both. If you don’t like it, just buy the CW ones, but don’t spoil the trend for the ones that enjoy them like myself.

Oscar 19th October 2017 - 3:26 pm

the opposite threaded nuts are very hard to find, besides most motors these days come in sets (four motors) so you can’t even ask for one single threaded motors. Many motor manufacturers are going back to single threaded motors now due to the high demand, so that’s not just me prefer single threaded.

Wayne 19th August 2017 - 4:47 am

Can you review the 45a esc that comes with this motor in the power combo?

MojoPapi 22nd July 2017 - 6:20 am

Did you take it apart and measure the stator? I’ve seen them under-rate their stator sizes from 24 to 22 in the past. The weight on that might be a giveaway.

Harald 28th April 2017 - 7:38 am

Can you tell us what the internal shaft diameter is ? is it 3, or 4mm?

Oscar 1st May 2017 - 4:26 pm

it’s 4mm i think.