I was out at the field yesterday doing some more testing with the RC Timer 40A ESC in two different planes.
For purposes of consistency with testing, all ESC settings were left on factory default and Zippy Flightmax 2200 3S 40C discharge batteries were used for all flights. Temperature conditions were the same as the last tests 22 C/72 F.
So I will start with ESC #1 which if you read my previous test report was very hot after flights with the 2212/6 2700 Kv motor and 6x3 EMP prop combo, I couldn't hold my finger on it for more than 3 seconds without feeling like I was going to get burned.
So I tested the D2826/6 2200 Kv motor and 6x4 prop combo on the wattmeter to see what sort of load the ESC had to deal with.
- 50% throttle - 15.7A/192.4W
- 100% throttle - 30.2A/359W
It is of note that this motor runs much stronger and produces about 28% more watts than the average D2826/6 motor that I have used and draws about 16% more amps. I am actually happy with that as it really zips this Mig-35 along really well. This ESC #1 delivered great power and performance, I was worried that replacing the Turnigy 40A ESC that I had in the plane would reduce the performance, but it did not. However, like with the first tests, the ability of RC Timer ESC #1 to dissipate heat was not anywhere near as good as the Turnigy Plush. It wasn't smoking hot, I could keep my finger on the ESC for about 15 seconds before I felt it was becoming too hot. With the Turnigy Plush, heat build up has never been a problem.
So while I don't think the ESC #1 with this motor setup would ever get hot enough to shut down or burn itself out, for the same performance, I would go back to the Turnigy Plush in the long run, however more on that to follow as there is a bit more testing I want to try.
So on to ESC #2 paired with the 2212/6 2700 Kv motor and 6x3 EMP prop combo. As I mentioned in my last report, I wanted to test this second RC Timer ESC before coming to more definite conclusions on this ESC. As a refresher, this motor and prop combo pull 37A at full throttle. The results were significantly better with this motor and prop combo than they were with ESC #1, but still too hot for my liking. I could hold my finger on the ESC for about 10 seconds before I felt the heat build up was too much. So this is significantly better, but still not good enough for my liking as this is a motor/prop combo that I run in a lot of my planes.
So next test will be to run ESC #2 in the Mig-35 with the D2826/6 2200 Kv motor and 6x4 APC prop combo to see what the results are.
So in all honesty, after seeing the results from these two ESCs, although the performance of ESC #2 was better, I would have a hard time recommending using this ESC on our NAMC recommended parts list. I think it much better off to spend an extra $5-6 (depending on the shipping) for the Turnigy Plush 40A ESC which you can run as hard as you want all day long with the "mild" and "medium" setups we recommend. Better to spend a little extra money at the start, get an ESC that is more reliable and much better at handling the amperage and dissipating the heat than go cheap, burn out an ESC, lose your plane and end up spending more money in the long run. At least that is my opinion and why I will not be putting it on our NAMC parts list.
My learning curve on props/motors/ESCs and batteries continues to be fairly steep, so after this experience, it makes me wonder about some things to look at when purchasing an ESC to match with your power setup.
I have long known that is is always prudent to select an ESC that allows for some "amp overhead" to help it run cooler and hopefully last longer. What perhaps is also important is not just the base rating, but the burst rating also when comparing the RC Timer and Turnigy Plush 40A ESCs for example.
Obviously I was not pushing the RC Timer to it's burst rating of 45A, but I was using up a much higher percentage of that than I am with the Turnigy Plush which has a burst rating of 55A. In the case of the 2212/6 2700 Kv motor used in these tests, I am pushing the burst rating of the RC Timer motor to 82% of maximum, while only pushing the Turnigy Plush to 67% of it's burst rating.
Of course there is always the argument that the quality of one is just better than the other and perhaps that is true, and perhaps it goes back to the tried and true adage that "you get what you pay for".
So it was fun to test these components and I think they would be OK to use with some of my "mild" setups on occasion, so the money has certainly not been wasted.