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| Z-Power RC 450TH | |||||||||||||||||||||||||||||||||||||||
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Specifications Weight - 57 grams, |
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| My thanks to www.wattsuprc.com.au for the supply of this motor for testing. The 450TH is a 2950kv brushless motor and a new variant in the 450 range. It is at the light weight end of the spectrum for a T-Rex motor with a weight of 57g. This puts it amongst the lightest motors tested to date. Fitting the motor proved to be very straightforward using 2.5mm allen nuts to secure the motor to the motor mount. I fitted a 13T pinion which should provide up to the 2800-2900RPM mark. I'm using the Castle Creations 35A ESC but in fixed throttle mode as the governor mode seems to be a bit off with the latest software updates.I did a test spool up to measure headspeed. The figures returned a willingness to head up beyond 2900 RPM but this soon dropped off under load. I had to use the curves to keep the wood blades within specification of 2400-2500RPM. I also approached this motor with some intrepidation as it's 450DH cousing had given my packs a real beating with high amp draw. I'm going to run one test for the 450TH, using stock wood blades and one with carbon blades. Later in the year this motor will be in the 4S super test where I pit all the 4S capable motors I have aginst one another. 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. Also new for this motor test is some inflight data gathered using BNB Products Digital Power Analyser. The results from this test were very interesting. The pack used for the inflight tests was a Thunder Power 3S 2000mah pro-lite. 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 450TH recorded the following maximum values : 24.36 amps 12.49 volts 247 watts The recorded minimum voltage was 9.72 volts during the 30 second full pitch / full throttle. The motor temp at the end of the test was 25 degrees centigrade, 77 degrees Fahrenheit. The lithium pack reached a max temperature of 45 degrees centigrade, 113 degrees Fahrenheit. All of this is well within specification and nothing of concern. This is a very cool running motor. During the 30 second climbout the headspeed dropped from 2400RPM to 2130RPM, a total RPM loss of 270RPM. This puts the motor power in the realms of a MEGA 16/15/3 which is quite respectable. Amp draw was similar to that of a Mega 16/15/3 as well but not so high as to be a concern. Next is the carbon blade test, again utilising the Kokam pack and using the Align Carbon Blades..... |
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| The 450TH recorded the following maximum values : 27.24 amps 12.47 volts 265 watts The recorded minimum voltage was 9.17 volts during the 30 second full pitch / full throttle. The motor temp at the end of the test was 25 degrees centigrade, 77 degrees Fahrenheit. The lithium pack reached a max temperature of 45 degrees centigrade, 113 degrees Fahrenheit. All of this is well within specification and nothing of concern. Again this is a very cool running motor. During the 30 second climbout the headspeed dropped from 2610RPM to 1935RPM, a total RPM loss of 675RPM. This is a very reasonable perfromance and in the same realms as many of the other 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 265 watts which is also very respectable in this weight class. Inflight testing. This is a completely new parts to the motor tests conducted by trextuning. The data is gathered using a DPR-50 from BNB products. The trex used in this test was an XL HDE running with a Thunder Power 2000mah 3S pack. The blades were the align carbon blades used the tests above. Throughout the course of this flight it was my intention to try to hit the peaks and troughs of power demand whilst putting the trex through a thorough work out. The data is less organised than the bench test data above (for obvious reasons) and I did not follow any particular flight regime in order to produce this data. The below graph is difficult to read so I have made it possible to click on this to get the full size graphic. |
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| The interesting elements to this flight data are the differences in amp
draw in flight versus static bench testing. I knew that the data would
show a lower amp draw with the model in free flight rather than strapped
down but the surprise is how large this difference turned out to be. The
maximum amp draw in flight was 22.3 amps which is significantly lower than
the 27 amps pulled in a static carbon blade bench test. Also notable is
that the average current for the entire flight was only 8.3 amps. Battery
efficiency was 78% across the flight and the motor provided a maximum power
output of 209 watts. I should also add that upon landing I checked my blade
pitches and discovered that I had knocked one of my transmitter switches
inadvertently and had been flying with 12° positive pitch. So maximum amp
draw could in fact be lower than shown above if using a standard 10° of
positive pitch. Overall conclusion During the flight testing of this motor I was quite impressed with the power delivery which to some degree was down to the lightweight motor and lightweight pack being used. One notable issue which can be seen in the carbon blade test during the full pitch / throttle test and has occurred on numerous occasions during flight (approximately twice per flight) should also be mentioned. This is a problem I believe with the Castle creations speed controller in that it appears to be losing timing with the motor during certain flight conditions, which results in a blip in the power and the motor shutting down momentarily. This can be quite worrying when it happens as it looks like a glitch. With a 2000mah pack I was getting in the region of eight to 10 minutes of flight. More often than not closer to eight minutes. Which is reasonable for this class of motor. Considering the power that this motor delivers the amp draw is reasonably frugal. 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. I didn't feel the need to drop the pinion from the selected 13T pinion but it is conceivable that running with a 11T pinion may result in less drop in head speed in the tests but would mean much less head speed being available for 3-D manoeuvres. Lastly, this motor because of its low KV value can easily be used with a 4S pack combination. The extra voltage would certainly provide a stronger performance and I will explore this in my 4S super test later this year. 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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