switched back to 75mm mob7 frame and gemfan 40mm bi blades. I'm tired of the short flight times of 65mm frames (even with bi blades). I also really like the combination of 300mah lipos with 75mm frames. I use a little piece of foam to hold the smaller lipo in place (the foam piece weighs less than a gram). I'm getting almost twice the flight times on 40mm props than with the 31mm. I also really like the throttle control and stability.

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