Now that I have done considerable testing with the RC Timer 6x3x3 carbon and Master Airscrew 6x4x3 props, I wanted to write up a summary of how they match up with the motors on our recommended parts list as well as a couple other motors I tried out. I have dated this post in the event some new info comes to light in testing or I add more three bladed props to our parts list. You can also find more detailed bench and field test data on both these props in our Props thread.
Here is a picture comparing the two props, you can see they do have quite different blade shapes. RC Timer (RCT) 6x3x3 carbon on the left, Master Airscrew (MA) 6x4x3 on the right.
These props come in a package of 4, two that turn clockwise, two that turn counter clockwise, all usable for park jet pusher configurations, it just might take reversing a couple of the ESC wires as they connect to the motor to ensure the prop is spinning in the correct direction.
The hole in the center fits perfectly over all the shafts on the 2212 size motors on which I tested them, all of which are on our parts list.
All the ones I received had to be balanced, you can read what I learned about balancing three bladed props at this blog post. Do be very careful then handling them as the blade edges can be quite sharp and being made of carbon fiber there is no flex in the blade, easy to cut yourself if not careful.
D2826/6 or 2212/6 2200 kv motor and RCT 6x3x3 prop
This prop works very well with this very popular size of park jet motor, although it doesn't provide a lot of thrust, only about 25 oz/709 gr at full throttle. It is however very efficient, pulling only 21.5A and compared to a 6x4 APC prop that pulls 25.5A, I landed with at least 10% more "gas" left in the battery with the RCT 6x3x3 even though I had to fly around with about 10-15% more throttle than I would have with a 6x4 APC prop. So for a very light setup, say less than 18 oz/510 gr or lighter, this would be a great alternative as you can easily run it with a 30A ESC and maybe as light as a 1300 Mah 3S battery and still get good flight times with it if throttle management is good.
2212/5T 2700 kv motor and RCT 6x3x3 prop
This prop again works very well with this motor. Speed is about the same as with the 6x4 APC, but it is quieter, cooler and more efficient. Although it produces about 2 oz more thrust on the bench than the 6x4 APC, this doesn't translate to any real noticeable speed at the field, perhaps due to the blade shape or the extra blade causing a bit of drag. However, it does only pull 29.4A as opposed to 33A that the 6x4 APC pulls. I would still run this motor and prop combo with a 40A ESC as you will be pushing a 30A ESC pretty hard.
2212/6 2700 kv motor and RCT 6x3x3 prop
This motor and prop combo work really well together. I think the 6x3 EMP two bladed prop still gives a bit more top end speed and perhaps initially a bit more "jump" when you hammer the throttle, but nothing I can't live with. It runs much cooler and more efficiently, pulling only 33.6A as opposed to 36.1A and runs much quieter than the 6x3 EMP.
Master Airscrew 6x4x3 prop
These props were all perfectly balanced from the factory, although I would still check them to make sure. Of course they are quite expensive compared to other props at almost $5 USD each (before shipping unless you can get them at a local hobby shop), so one would hope they would be in good balance :)
To fit them properly on the shaft of the prop collet for 2212 size motors, you will need to ream/drill out the hole in the hub.
This prop seems to be a bit more "RPM sensitive" than the RCT 6x3x3 prop depending on the motor, however which confuses me a bit, but I'll go with it :). Of course with extra pitch and different blade shape, that might also have something to do with it. In my own testing with it and from discussing it's performance on some very powerful NTM 3000 motors with one of our Mig-35B pilots Jeff (Wildthing on RCP), it gets to a point of diminishing returns as you try to spin it faster. In other words it starts to produce even less thrust than perhaps a 6x4 APC or 6x3 EMP, but draws considerably more amps and produces considerable heat in the motor and ESC, certainly not worth chancing the motor and or ESC being damaged.
The only motors I would use with this prop from our parts list are the "mild" motors, or the 2826/6 or 2212/6 2200 Kv motors. This is not a good prop for 2212/5T 2700 Kv or 2212/6 2700 Kv motors as it pushes them too hard, draws too many amps and causes considerable motor heat build up.
However, it does seem to work quite well with the Grayson Hobby Super Mega Jet V2 (2550 Kv) and the DYS BE2208/7 2600 kv motors which I have bench and field tested and saw good results. For any motor I bench and field tested with the Master Airscrew 6x4x3 prop, I would use a 40A ESC, they all push very close to or over 30A at full throttle, so using a 40A ESC would be the safe thing to do.
If you would like more details on the specifics of bench and field testing on these two three bladed props, you can find them in this thread. The most recent version of my testing spreadsheet as of the writing of this post can be found attached here at post #455.