<u><span style="font-size: medium">Results:
</span></u>The motor ran smoothly with all the props tested (even though current and power, in some cases, certainly exceeded the 50A / 500W Retailer max rating).
Results are shown on the attached data sheet.
-For each prop, the lower voltage reading is for 3S LiPo, and the higher one is for 4S LiPo as the voltage source.</p>

Kv: I used two methods for calculating Kv. First, I used www.peakeff.com to calculate Kv and also Rm ("static" motor resistance); I used the 3S LiPo data values for smallest and largest props, to give the largest difference in load).
Second, I used DriveCalc to calculate ns ("real world no load speed") and Rd ("dynamic" motor resistance); DriveCalc also gives a Kv value when data is entered for a new motor (For DriveCalc, I used 3S LiPo test values for 3 different props, at very different loads).
PeakEff gave a Kv of 976; DriveCalc gave a Kv of 977, and ns of 962 -all these values were very close indeed. PeakEff and DriveCalc also gave identical values for Rm and Rd, of 58milliohms.</p>

Current draw: When 3S LiPo was used as the voltage source, none of the props tested exceeded 50A. The 10x5 prop drew a current of 20.9A, and the 14x8.5 prop a current of 37.8A.
With 4S LiPo, almost all the props drew more than 50A (the max current rating)&hellip;! Even the 11x4.7 prop drew a current of 51.5A, and the 14x8.5 prop generated a current as high as 77.6A..</p>

Input Power: Once again, using 3S LiPo, none of the props tested required more than 500W of input power. The largest was the 13x6.5 prop which produced 372.9W.
However, on 4S LiPo, it was a VERY DIFFERENT story. All of the props tested, between 10&rdquo; and 15&rdquo; diameter, required a power of more than 500W. Even the small 10x5 prop demanded 505.8W, and the 14x8.5 prop drew a power of 1016.6W -twice the max power rating given by the retailer Hacker.</p>

RPM: Prop RPM reduced as prop diameter became larger. For all props, RPM was about 30% higher with 4S LiPo, compared to 3S LiPo.</p>

Thrust: This 150g motor generated a maximum of 3.06kg thrust (with 4S LiPo), and that is impressive.
When 3S LiPo was used, the max Thrust was 1.72Kg, using a 13x6.6 prop. With 4S LiPo, a max thrust of 3.06kg was produced by the 14x8.5 prop.</p>

g of Thrust per Watt of input power: In general, and for all props tested, 3S LiPo gave around 5g Thrust per W of input power.
With 4S LiPo, the values were lower, around 3.3g to 4g Thrust per W of input power. With the 2 largest props (14x8.5 and 15x8) it was only 3g Thrust per W of input power -suggesting a bit of o
overload.</p>

RPM as % of Kv x V: Values for the smallest props were generally above 70%, and could be as high as 89% (i.e. the 10x5 prop on 3S LiPo). The 2 largest props, on 4S LiPo, only had values of 59%.</p>

Efficiency %: This was calculated as Power OUT (i.e. power produced by motor, taking into account internal Rm losses) divided by POWER IN (Vin x Iin =Watts in). The 4 smallest props had an efficiency &gt;70% with both 3S and 4S LiPo. The 2 largest props on 4S LiPo, only had an efficiency was around 63%, 65%.


Pic shows original datasheet, with original readings:



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