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09-20-2009 12:34 PM  11 years ago
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BMann

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Darlington, SC USA

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The wandering tail...
Hey guys, need some advice here.

Stock Belt CP (Okay, the ESC's not, it's a 35A, but..). Meaning, the older 72M stock tranny, etc.

To hover, I have to keep constant right-rudder on the left stick to keep the nose from wandering to the left. Trim won't adjust it, I'm convinced it's the gyro. Turn the gain up? Another gyro? Sunspots? I'm not holding my mouth right?
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09-20-2009 01:02 PM  11 years ago
DougsRC

rrProfessor

Mass.

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tranny
BMan, it could be your gyro but try this first. If the trim on your TX is maxed out, move the servo on the boom, I think forward in your case about an 1/8th or so to get your pitch slider closer to the center of the tail shaft and try to get your servo arm at 90 degrees. I always check the mechanics first and then look into the electronics such as the gyro or servo. In other words the best gyro and or servo in the world can't overcome mechanical limitations.
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09-20-2009 01:29 PM  11 years ago
shizack

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Aiken, SC USA

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I've helped 2 people set up their BeltCP's. Both of them suffered from lack of tail authority. I believe it's the power train. The Esky 3800/3900 motors don't really crank enough headspeed with the stock pinions to keep the tail going fast enough to move sufficient air to overcome motor torque.

What pinion size do you use? You should probably be using at least a 12T or 13T if you use either of those motors, especially with the stock TX. I think the stock TX maxes at around 80 - 85% throttle. Once the second guy I helped got a DX6i and we programmed some decent curves the tail held much better.

Try what Doug said first. It still may be the gyro, but I smell low headspeed.
A soul in tension is learning to fly
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09-20-2009 02:21 PM  11 years ago
BMann

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Darlington, SC USA

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I have to blame the cat!
You both were right!

I'll write it off to "hangar rash".

Somehow, the servo mount got bumped to the rear, and my last flight, I guess I moved the right knob. Servo mount forward, as Doug said, about 3/16". And reset the pitch knob to dead center.

Proper mast speed, plus reset servo. DARN! I took my left finger off the stick! Perfect! There we go.

You both have earned a beer. On me. Thank you both!
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