Rotorgeeks 7075 Series 2205 2700kv w/bullet connectors

This version comes with presoldered bullet connectors and a wire length of ~3cm (motor base to tip of bullet). 

The next generation of Rotorgeeks motors has arrived!  We've taken the wildly popular 2205-2700kv motor (the one that started the high kv trend), and upgraded the material to 7075-T6 aircraft grade aluminum, with almost 3 times the tensile strength of traditional 6063.  The case design has been re-engineered for maximum strength and impact resistance.  More material in key structural areas, spans, mounting hole clearance and other potential points of failure in a high speed impact.  Shafts are secured into the rotor both mechanically and with a high strength adhesive to make shaft slippage and vertical play a thing of the past.  The shaft is now held in place at the base with a standard e-clip, making servicing and parts replacement easier than ever.

We believe the 7075 Series is the toughest miniquad motor on the market.

The 2205 motor takes on 2g of additional weight compared to the RG 2204 and provides significantly more power.  The second of a series of high performance multirotor motors designed and manufactured to our specs. These are not simply rebranded motors.  Every element has passed rigorous design, lab and flight testing over a 6 month period and is a reflection of our perspective on what makes an ideal multirotor motor.

• Single wire winding - offering high current capability and heat tolerance (up to 180°C).  Most of the high perfornance custom wound motors use this technique rather than multi strand wire.  Why is it unusual? The larger wire gauge can't be wound by machine...
• Hand wound - even with all the automation available today, nothing matches the accuracy of skilled human.  The heavier gauge wire used in the Rotorgeeks motors demands hand winding
• Fully serviceable - right from the start we wanted to be able to repair and replace every part of the motor to handle crashes as well as wear and tear.  Bearings are not glued in place.  All parts are available separately - rotor w/shaft, stator, bearings, clips and shims.
• The little things
  • Dynamically balanced rotors
  • Case design was engineered for light weight and maximum cooling and airflow to the windings. 
  • The prop height has been set a little higher to reduce the likelihood of props striking the ESC. 
  • Greater clearance from the base to the windings to afford more tolerance on long mounting screws (without hitting the windings)
  • The integrated prop adapter provides a comfortable but not too tight fit on HQ props
  • Japanese NMB bearings
  • shaft permanently fixed into rotor
  • N45SH high temp magnets and 0.2mm steel laminations for stator (we've noticed some manufacturers moving to even more powerful N52 magnets but we don't think this is a good idea as they are not available with high temperature ratings - they will permanently demagnetize if overheated!)
  • Shaft and clip are completely recessed - the motor can be mounted on a flat surface without the need for a hole in the centre of the motor mount (nothing sticks out the bottom)
  • Each motor comes with a hardware kit that includes a nylock nut, standard nut and M3x6 hex head motor mount screws and washers.  The screws are good for arms ranging from 2.5 - 4mm thick.

The 2205-2700kv is primarily intended to run 4" props on the 180mm class machines such as the Tweaker, Misfit, Highwind X4 etc.  We know that won't stop some of you from running 5" but please be careful if you move to more agressive pitch, bullnose or tri-blade props.  Over propping is both hard on the motor and ultimately won't yield additonal thrust if it's outside of the operating range.  When the motor can't spin any faster the extra energy is converted to heat in the windings.  Watch the motor temperatures carefully.  If you smell burning enamel or can't keep your fingers on the motor you're running too much prop!

Specs:

• Stator:   22mm wide X 5mm high
• Stator slots / poles:  12/14
• Weight: 27g with 3cm of motor wire
• Mounting pattern: 16x19mm

The back story
Rotorgeeks has been proudly selling Cobra motors since before the development of the CM series for multirotors.  Cobras have always been great for quality and performance but their success has also led to availability challenges.  We began this journey with a simple objective - to create a motor of equivalent capability that we could actually keep in stock.  Matching the performance of the Cobra did not prove an easy task.  Prototype after prototype, we worked on every facet of the motor in the quest to match the Cobra, playing with different magnets, copper, winding techniqes etc.  Around June this year, we thought we had it based on prototype testing.  The first batch of motors arrived but the performance was still a bit lower than our objective and after much consideration, not good enough to release with the Rotorgeeks name.  A little more R&D and we landed on the final product.  The first batch of motors went back to China where they had the stators replaced (along with bearings and clips).  We're thrilled that at the end of a long road, we have the product we wanted.

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