As you may have already read in a previous post, I recently picked up some 7x3 EMP props from RC Timer to test with our "mild" and "hot" motor setups. You can find more links and info about the "mild" motor testing with this prop in this post.
So today I completed some bench testing using the 7x3 EMP prop, the NTM 2700 Kv motor, a Turnigy Plush 60A ESC (capable of bursts to 80A, timing set to low) and a Zippy Flightmax 2200 3S 40C discharge battery.
So here are the results
16.7A/198.4W producing 720 gr/25.4 oz of thrust
71.6A/818.7W producing 1560 gr/55 oz of thrust.
Wow! The full throttle numbers with this prop on 4S are almost exactly the same as 4S results with a 6x4 APC prop. Now I suspect that top speeds might not be quite the same since there will be a bit more drag with the longer prop, but to have that kind of thrust on a 3S battery is pretty impressive! Of course throttle and flight duration management will be very important so as not to burn out motor, ESC or battery since they are all going to be pushed very hard. As I have learned with the 4S setup, keeping throttle bursts to 3 seconds or less is important to keep things running OK. Besides, at those speed, any longer than 3 seconds and it will be out of sight!
Excited to give it a try, it is added to the list of other motor and prop testing I have to do, so more to follow in the coming weeks.