I have been so impressed with the quiet power and efficiency I have been getting with the Master Airscrew (MA) 6x4x3 prop, I ordered up a few more. I have been running it with great success in my RC Powers Su-27 and F-22 V5s using the very popular Turnigy D2826/6 2200 kv motor. It has been working really, really well with these two planes which are both about 21 oz/595 gr range.
6x4 APC results -
50% throttle - 11.9A/140.1W producing 418 gr/14.7 oz of thrust;
100% throttle - 24.0A/267.3W producing 671 gr/23.7 oz of thrust.
Master Airscrew 6x4x3 results -
50% throttle - 13.0A/154.2W producing 470gr/16.6 oz of thrust;
100% throttle - 26.9A/307.8W producing 884/31.2 oz of thrust.
Just for grins, I also wanted to see the difference in noise level of these two props, so I found a free sound meter app for my cell phone and tested the noise level on the bench. The phone was held about 1 ft from the edge of the prop arc in both tests.
6x4 APC - 84 dB;
MA 6x4x3 - 77 dB.
Not a big drop in noise level, but perhaps it is the frequency of the prop noise and how it carries through the air as I and many of my fellow RC club members not how much quieter it is. It is without a doubt the best 3S setup I have ever used with the Turnigy 2200 motor.
So since I already know it causes too much amp draw and heat build up in the 2212 2700 kv motors I like to use (the mild and hot motors on our recommended parts list), I got digging through my "supply bin" and decided to test the MA 6x4x3 prop with the RC Timer 2208/8 2600 Kv and the old school Grayson Hobby Super Mega Jet V2 (SMJV2) 2550 Kv motors.
The RCT 2600 and SMJV2 are not two motors that will ever be on our recommended parts list, but I had them laying around and thought I would test them out.
Both tests done using a Turnigy Plush 60A ESC at low timing and freshly charged Zippy Flightmax 2200 3S 40C batteries.
RC Timer 2208/8 2600 kv results
50% throttle - 13.3A/157.4W producing 402 gr/14.2 oz of thrust;
100% throttle - 32.7A/381.0W producing 780 gr/27.5 oz of thrust.
50% throttle - 14.8A/178.4W producing 488 gr/17.2 oz of thrust;
100% throttle - 29.7A/357.3W producing 946 gr/33.4 oz of thrust.
Based on these results, I will not use the RC Timer 2600 motor with the MA 6x4x3 prop in a plane as it is not very efficient and I think I would be pushing the motor beyond it's amp limit far too often.
I will however try out the SMJV2 if nothing else for old times sake. It is a bit heavier motor than the 2212 series of motors I normally use, but provides pretty efficient power. I already have one installed in one of my Mig-35Bs to start testing very soon.
More results from the field to follow soon.