For a while now, I have been recommending the RTC5010 + RCT15x5.5cf prop as a very efficient, stable combination. I think I have now found one better.
I've been testing the Tiger Motors MN3508-29 (380kV) + RCT15x5.5cf combination. They have very similar performance and have an efficiency sweet spot below 50% throttle on 4S.
MN3508-29 vs RCT5010
Pros:
- Much higher quality construction
- Consistently lower vibration out of the box
- Higher efficiency (don't have hard data on how much yet)
Cons:
- More expensive (but if you factor in how many RCT5010's you have to throw away or use for parts, not too much more)
- Heavier