Hi Everyone -
I had my test rig busy today getting some testing done with a couple motors using the King Kong/LDARC 6040 prop which I field tested in post #4 above but had not gathered any bench test data til now. Link to the prop https://www.banggood.com/10-Pairs-KINGKONG-6040-Propellers-CW-CCW-For-QAV250-RC-Multirotors-p-988179.html?rmmds=myorder
I will cover the highlights below, but you can also read the full test numbers on the motor test spreadsheet for the two motors I tested, the Racerstar BR2406 2600 and the GepRC GR2306 2750 here https://docs.google.com/spreadsheets/d/1KLR_wdkJ1OdGcf5f9jxxxU8qqmz_kXjMQH8NOLjW3NQ/edit?usp=sharing
For the Racerstar motor, I used the Turnigy AE-45A ESC with custom settings of 22.5 degrees timing and 24 KHz on the PWM frequency for both 3S and 4S testing. I saw some very good results for what is essentially a $0.25 USD prop
On 3S, thurst performance is about the same as what I saw with the Gemfan 6045 Carbon nylon prop, about 10 gr less thrust with the KK prop at mid and full throttle, but quite a bit more efficient drawing about 3.4A less at full throttle.
On 4S, the numbers are almost identical to what I saw testing the 6x3 EMP prop, perhaps this is why I really couldn't tell the difference in speed at the field, although my eyes aren't what they once were.
Here are the 4S numbers for the Racerstar motor with the KK 6040 prop.
50% throttle - 17.3A/284.6W producing 800 gr/28.2 oz of thrust;
100% throttle - 43.6A/660.4W producing 1460 gr/51.5 oz of thrust
Again, not bad for such an inexpensive prop on a value priced motor
For the GepRC motor, I tested the KK 6040 prop on 3S using the Turnigy AE-45A ESC again with the same settings listed above as that is the ESC I would use on 3S most of the time in most of my planes.
50% throttle - 19A/228.9W producing 695 gr/24.5 oz of thrust;
100% throttle - 39.9A/449.9W producing 1210 gr/42.7 of thrust.
So these numbers are not as good as the numbers produced with the 6x3 EMP prop on 3S, but are better than the numbers with the 6x4 APC gas prop which is about 10 times the price of the KK 6040 prop (for me anyway). It is also more efficient producing this power than either the 6x3 EMP or 6x4 APC gas props.
For the 4S testing, I used the HobbyWing Platinum PRO 40A ESC with custom settings of 26.25 degrees timing and 8 KHz PWM frequency. Here are the numbers with the KK 6040 prop.
50% throttle - 26.1A/420.8W producing 1030 gr/36.3 oz of thrust;
100% throttle - 57.1A/850.4W producing 1780 gr/62.8 oz of thrust.
So this is interesting as the numbers are very close to the 6x3 EMP and also with less amp draw on 4S. What is interesting is that when I hammered the throttle to full, the thrust jumped to about 1830 gr on the test stand for just over a second before settling at 1780 gr (I like to hold the throttle in position for about 5 seconds to get a more valid reading). I had not seen a number that high with the 6x3 EMP bench testing
So now that I have my speed test bed Su30 built again, I will continue with the GepRC motor/HobbyWing 40A ESC and 6x3 EMP prop on 4S to see if I can break 100 mph with that setup and then try the KK 6040 prop to see what the results are in the air since I will be using my GPS data logger on the 4S setups to see what sort of top speeds I am getting