I have been very busy at the field the last couple days since receiving a couple of Master Airscrew (MA) 6x4x3 props in the mail. I purchased them from a distributor in Canada, Great Hobbies. These props are certainly not cheap, $6.99 Cdn (about $5.29 USD) and unfortunately by the time I paid for shipping, they were $12.74 Cdn each :/. They also seem to be available in limited quantity on Ebay and most reputable online hobby distributors and local hobby shops (unfortunately I don't have a LHS, so all my shopping for goodies is online).
I had purchased them to use in combination with a DYS BE2208/7 2600 Kv motor that had been getting very good reviews on the RC Powers forum. Alas, I might have received a dud motor as it started acting quite strangely on the 7th flight. You can read more about that motor on the Motors thread.
There is no doubt however, this is a very good quality product, both props balanced perfectly out of the package and the finish is very high quality. A few pictures of the packaging in which each prop was delivered. A little fancier than most of the props I use :)
As already mentioned, day 1, I tested it with the DYS BE2208/7 2600 kv motor with good results until the motor started acting up. I did shoot this short video so that you can hear how different it sounds from a 6x4 APC or 6x3 EMP setup. It is overall much quieter and almost sounds more like an EDF setup. It was on this flight that the motor first started acting up at about 3:50 of the video.
- Turnigy 2826/6 2200 kv;
- Gear Best A2212/5T 2700 kv; and
- Gear Best XXD 2212/6 2200 kv.
This prop is ideal for really getting an increase in power in the 2200 kv motors I tested, I would say at least a 15% increase in power and speed with very little increase in heat build up and negligible increase in battery consumption.
Today at the field, I tested this prop with the Turnigy 2200 motor, so I will go into a bit more detail with it as I did some comparative bench testing before going to the field. I purposely picked my "weakest" Turnigy 2200 motor to see if the MA 6x4x3 prop would breathe new life into it. As you can see by the 6x4 APC numbers, it is at the very lowest end of thrust one might expect from most 2826/6 2200 kv motors. It is very lethargic, only really good in most of my planes in very light wind conditions or in a super light plane, so it has not seen much use.
Here are the test numbers, all tests done with a Turnigy Plush 60A ESC and Zippy Flightmax 2200 3S 40C battery.
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.
Fortunately, these numbers translated directly to better performance at the field. It was like a whole new motor with the MA prop, very good power and speed in a 20.9 oz airplane. I tested it in the modified RC Powers Su27 V5 shown below. Not as fast as the GB 2700/6x4 APC prop combo I had been running in it, but quite respectable. I might swap in the GB XXD 2200 motor to continue evaluating it and the prop as it runs stronger than this Turnigy 2200 and the MA prop also made a significant increase in it's performance.
However, throughout all the flights, this prop performed exceptionally well, ran very smooth and balanced. It has provided excellent acceleration and top speed, very immediate and linear. I suspect this is due to the high quality of the material used to make the prop. As you can see in the picture above, it has a very "beefy" hub and the blades are very stiff and strong. If there is any prop flex when hammering the throttle, I suspect it is minimal compared to the lighter more flexible 6x4 APC props I use (actually knockoffs from Hobby King) and the 6x3 EMP props.
I will continue testing, granted these props are expensive, but so far worth the investment. If I buy them again, I'll probably buy four of five to lessen the pain of the postage! :/ More to follow as I continue enjoying this prop with the 2200 kv motors.