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| Hyperion YH22XL-3900 | |||||||||||||||||||||||||||||||||||||||||
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Specifications 3900kv |
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| My thanks to www.aircraft-world.com for the supply of this motor for testing. The YH22XL-3900 is a 3900kv brushless motor and one of a new range of kv motors in the Hyperion range. It is at the heavy weight end of the spectrum for a T-Rex motor with a weight of 89g. This puts it amongst the heaviest motors tested to date. Fitting the motor proved to be very straightforward using 2.5mm allen bolts to secure the motor to the motor mount. I fitted a 9T pinion which should provide up to the 2800RPM mark. I'm using the Hyperion Titan 30A ESC using the governor mode.I did a test spool up to measure headspeed. The figures returned a willingness to head up beyond to 2800 RPM but this soon dropped off under load. I had to use the governor to keep the wood blades within specification of 2400-2500RPM. I'm going to run one test for the YH22XL-3900, using stock wood blades and one with carbon blades. The test will follow the format in the table below. The test was conducted in an ambient 22 degrees centigrade, 72 degrees Fahrenheit. The pitch range on the T-Rex being from +/- 10 degrees. The power source was a Kokam 3S 2000mAh pack. The tests were performed before I had the BNBProducts inflight recorder, so there is no inflight data available for this review.. The test are charts are created from the CSV data from the Hyperion Emeter which shows Volts/Amps and RPM on one chart and Watts on a separate chart. |
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| The YH22XL-3900 recorded the following maximum values : 23.58 amps 12.44 volts 250 watts The recorded minimum voltage was 9.65 volts during the 30 second full pitch / full throttle. The motor temp at the end of the test was 70 degrees centigrade, 158 degrees Fahrenheit. All of this is well within specification and nothing of concern. This motor does run quite hot in comparison to other motors but nothing near temperatures that would cause a problem for the motor itself. During the 30 second climbout the headspeed dropped from 2450RPM to 2190RPM, a total RPM loss of 260RPM. This puts the motor power amongst some of the best tested by TrexTuning.. Amp draw is quite low given the power being produced. Next is the carbon blade test, again utilising the Kokam pack and using the Align Carbon Blades..... |
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| The YH22XL-3900 recorded the following maximum values : 28.8 amps 12.49 volts 291 watts The recorded minimum voltage was 9.6 volts during the 30 second full pitch / full throttle. The motor temp at the end of the test was 78 degrees centigrade, 172 degrees Fahrenheit. All of this is well within specification and nothing of concern. Again we have quite high temperatures on the motor but not high enough to cause any motor issues. During the 30 second climbout the headspeed dropped from 2595RPM to 2010RPM, a total RPM loss of 585RPM. This is a very good perfromance and amongst the most powerful motors that trextuning has tested. Bear in mind it is the final RPM that counts not the overall drop in RPM over the 30 seconds. The motor returned 291 watts which is also very respectable. Regular TrexTuning readers will notice the rather problematical RPM at the start of this test, the tachometer appeared to be picking up some other source and didn't settle until 2 minutes into the test. |
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| Overall conclusion During the flight testing of this motor I was impressed with the power delivery and smoothness of this motor. The motor governs very well and provides plenty of punch out when required. Full power climbouts were quite impressive and the T-Rex gives a much better feeling of confidence when you know that there is plenty of power on top to get out of a situation. Throttle response is very good and there is clearly a good deal of torque being produced to handle those punchy 3D moves. I have enjoyed flying this motor during the testing and it's nice to have a motor such as this which not only has power but is happy to be governed by the ESC without problems of fluctuation in motor RPM and the inherent tail wag that goes with it. With a 2000mah pack I was getting in the region of 10 minutes of flight. Which is very reasonable for this class of motor. Considering the power that this motor delivers the amp draw is low, this is very well worth noting. Also this motor is capable of producing an abundance of head speed when running from a 3S pack which helps produce some quite exciting 3-D capability. With this motor being a 3900kv it is not possible to run this motor on higher voltage but there is a 3250kv motor in this range which I will be testing in the very near future. This motor will also be in the 4S super test later this year. I also have a 3600kv motor from this same range which I will also be testing in the near future. Also new in this review is the option to ask questions or discuss the content of this review. Click here. If you own this motor please rate it using the TrexTuning rating system ...... |
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