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| NEU 1105/3Y | |||||||||||||||||||||||||||||||||||||||||
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| 200Watts Continuous current, 350Watts - 30sec Max rpm: 60,000 Stator Dia. 1.1" Magnet/rotor length 0.5" Shaft: 2.3mm or 3.2mm Shaft length: .5" Weight: 2.3oz (65g) Dimensions: 1.14" dia. X 1.2" long
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| The NEU 1105/3Y is a 3500kv brushless motor and comes from the well know
brand of Steve Neu. It is at the light weight end of the spectrum for a
T-Rex motor with a weight of only 65g. Fitting the motor was straight forward
although the motor only comes with very short wires, so some relocation
of the ESC was required to get the wires to meet. The NEU does not come
with a heatsink but has an integral fan built into the motor for cooling.
I fitted an 11T pinion in line with the 3500kv motor rating. Having set
the Phoenix 35 appropriately I did a test spool up to measure headspeed.
The figures returned 2340 RPM. I was expecting faster than this for a 3500kv
motor, particularly as the AON was up close to 2800RPM on a 11T pinion
and also has a 3500kv rating. There seems to be quite a lot of fluctuation
in delivered RPM in these kv ratings, which can make pinion selection difficult
to judge. I haven't had opportunity to flight test the NEU at all yet, so for a change the bench tests will come first, followed by flight experiences later. Once again I will have to wait for the UK winter weather to calm down. I'm going to run two separate bench tests for the NEU, one test using the Tanic 3S 2220mah and the other with the Thunder Power 4S 1320mah pack. Both tests will follow the standard format as below. The tests were conducted in an ambient 20 degrees centigrade, 68 degrees Fahrenheit. The pitch range on the T-Rex being from +/- 10 degrees. Blades used were the standard Align 315mm wood blades. |
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| Charts for 3S operation : | |||||||||||||||||||||||||||||||||||||||||
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| The NEU (on 11T) recorded the following maximum values : 15.9 amps 12.6 volts 161 watts The recorded minimum voltage was 9.7 volts during the 30 second full throttle/pitch. The motor temp at the end of the test was 56 degrees centigrade, 132 degrees Fahrenheit. The lithium pack reached a max temperature of 47 degrees centigrade, 118 degrees Fahrenheit. All of this is well within specification and nothing of concern. During the 30 second climbout the headspeed dropped from 2340RPM to 2020RPM. A total drop of 320RPM.This was starting from a lower headspeed than my usual 2450RPM. I couldn't get the NEU up to this speed at hovering pitch on the 11T. My initial thoughts are that given the media/forum hype (not manufacturer generated hype I should add) around this motor I was expecting a higher perfromance than the Mega 16/15/3. Based on these results the Mega 16/15/3 provides almost identical performance. However, it should be noted that the NEU has a weight advantage of 11g and the NEU max amp draw over the course of the test was 3.2 amps below that of the Mega 16/15/3. So although the performance in terms of power is very similar the NEU is lighter and will give longer flight times than the Mega due to the overall lower amp draw. These are important aspects of this motors performance and should not be overlooked and represent just how efficiently this motor runs in comparison to it's rivals. Overall from a bench test perspective I had an expectation of slightly more power, however, given the size of this motor and it's amp draw characteristics I feel it has put in an impressive efficiency performance worthy of the hype even if it's an efficiency perfomance rather than a raw power one. Anyone looking for a motor capable of good 3D performance at conservative amp draw should give the NEU a good look. The AON 2815-3500 remains the most powerful motor tested so far by a good margin but it should be noted that this motor is a full 33g heavier than the NEU and amp draw was also higher. I should also note that the motor is normally sold with 4S power sources in mind and that on 3S the motor probably isn't showing it's best colours (even though it did perform very well), given the video evidence available I'm looking forward to seeing what the NEU can do on 4S. Next testing was done with the Align Carbon Blades, exact test setup as above, ambient temperature was 21 centigrade 70 degrees Fahrenheit. Graphs below : |
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| The NEU (on 11T) using Align 325mm Carbon Blades recorded the following
maximum values : 17.9 amps 12.6 volts 176 watts The recorded minimum voltage was 9.2 volts during the 30 second full throttle/pitch. The motor temp at the end of the test was 53 degrees centigrade, 127 degrees Fahrenheit. The lithium pack reached a max temperature of 50 degrees centigrade, 122 degrees Fahrenheit. All of this is well within specification and nothing of concern. During the 30 second climbout the headspeed dropped from 2400RPM to 1840RPM. A total drop of 560RPM. Given the relative size of the NEU this is quite a respectable result when compared to the AON 2815-3500. Flight Testing I have had two packs worth of flight experience with the NEU. Noticeable characteristics are the lighter feel of the T-Rex due to the lower weight of this motor. Climbout is reasonable but I think the NEU would benefit from use of a larger pinion, say a 13T to get more headspeed. This would give the more rapid performance I was hoping for but I haven't at this point got a 13T 2.3mm pinion that I can try this out with. All flight testing was done on standard Align 315mm wood blades, so the performance was dampened by the slightly mellow flight characteristics of these blades. I'd like to try the NEU on the Align Carbons given it's respectable performance in the power test above. I will be doing this once the weather clears. Flight times were good given the performance delivered and certainly better than one might expect from the NEUs nearest rival the Mega 16/15/3. The NEU is certainly quite frugal in it's amp draw requirements and is also a very cool running motor. This frugal amp draw also pays off in longer service life for the lithium packs being used. Carbon Blade flight tests to come, plus some 4S power figures.... |
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