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Skookum Robotics Skookum Robotics SK-360 SK-540 & SK-720 Digital Flybar |
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01-31-2009, 05:12 AM | #1 (permalink) |
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Join Date: Jul 2008
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Cyclic pitch setting of sk 360 - from Skookum
Skookum gave me this and I feel it helps, thus should share with all of you here.
Cyclic pitch sets the control motion available to the gyro. You want the normal +-10 deg to make sure the SK360 can have enough trim for fast forward flight, and then you want to not change it after that. The reason you want to keep the same range, is that the gains will be changed too by accident, and you'll have to re-tune a bit. Also, if everyone uses similar cyclic pitch ranges it makes it easier for them to compare gain settings. If you change the control rate, the only other thing you might need to adjust is the bell gain. So usually if you increase control rates by say 50%, say from 180 deg/s to 270 deg/s, you'd also want to increase bell by about that much (its not exact). For more roll speed, I think +-10 should provide the max roll rate. At that point with a bit of collective pitch the blades are stalling, I've seen it in data logs. But roll rate is a function blade pitch *and* blade weight. With most blades the G5 and trex450 are both limited by their physics to around 270 deg/s to 300 deg/s max rates, so you could set it higher in the sk360 but it won't help. Lighter blades might help it roll faster, but might be a bit less stable.
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