Thread: Build Log Build A Tricopter
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Old Jan 24, 2010, 05:26 AM
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Dihedral reduced thrust and pendulum effect.

Originally Posted by etman View Post
I'm not getting enough endurance from my 3s 2200 battery running on Turnigy SK motors, only 4 mins. This motor is rated for 3s and 4s.
My guess is the thrust is not optimal for 3s, this motor requires 4s to shine.
It requires 75% throttle (on the pitch curve) to hover with a 6 oz payload and endurance is 4 mins.

But 4s would mean greater weight and change to a 4s lipo alarm.
Partly the reduced thrust is due to the dihedral angle on the motors. I have about 5 deg of it.

And dihedral makes the tricopter act funny.
Let me describe. I put it in forward flight. Then I pull back to slow it down to a hover. Instead of levelling out, it slightly overshoots into forward flight again. Sort of a pendulum thing. Next time I'll try with less "braking" and let it settle down into a hover.
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