I have a power meter and test all motors on scales in situ in the airframe, great indicator of performance in flight. All my planes from 2s up to 4s have unlimited vertical. (Including my Su37 Twin edf)
Interesting stuff. The 4S testing is going well thus far, some video I shot a couple days ago. If you watch on YouTube, links to all the power components are in the video description.
The plane in the video weighs 575 gr with the 4S battery, so with thrust from the bench testing being 1630 gr with this setup, T/W is about 2.8:1.
Now that I have had a few flights to experience the power, I have put this same setup in my "Mini Mig-35B" which has a 24" wingspan, so much less drag and weighs 534 gr with the 4S battery, so theoretically a T/W of 3.1:1. It is pretty fast already on 3S, so on 4S it should be pretty crazy!
I am hoping to get a bit more speed out of the EMAX 2306 2750 setup I'm running once I get a chance to try some 5" props with more pitch, although very fast at the field, I fear that the RPM are getting so high that the 6x3 EMP prop may not be delivering the full bench tested thrust past a certain throttle setting. But that is why we bench and field test these things I suppose
I'm also currently building a modified, downsized RC Powers Su-30 V4 which will have about a 24.5" wingspan, I think it might be an even sleeker airframe than the "mini Mig" I have been doing a video log on my YouTube channel at this playlist
Best of luck with your testing, interested to hear how those Cobra motors perform
Hows the 4s going @e3_Scott
? It's a drill I bet. My 350g Mig 29 took a beating on 4s 1550g of ST with a TW of over 4:1!!!
Regarding the 2s project Let me try a few things out 1st Scott before I make my recommendations. But the best thrust I've seen in situ is 660g on 2s drawing 20a. To make 3:1 I'm looking at a auw of 220g or less and I've got some very light parts coming. It's definitely achievable. (Still using 9g servos)
Happy flying chaps.