Thanks so much Jeff, I took off a lot of weight from the bottom of my free spinning rotor, and voila! I got 28 seconds in my small foyer!Weight is CRITICAL. Excess weight is bad. Any recommendation for rubber size for a 4 gm copter will just be completely WRONG for heavier copter and KILL flight time.
I'm pretty sure you will be limited to 1.5 gm rubber, don't fly with more! If your copter is heavier, just user thicker 1.5 gm motors or increase the strands of thinner motors. Or better yet, make a lighter copter.
You CAN use uneven numbers of strands, though its a little tricky. Tie a loop in both ends of the band. Hook one end over the prop hook, loop strand around tail hook, around prop hook again and the other end loop then goes over the tail hook giving you three strands as an example.
So, if you want to fly well, FIRST learn to build to weight. Then play with rubber size and rotor pitch.
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