alfa1
New Member
Posts: 12
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Post by alfa1 on Dec 16, 2010 22:08:37 GMT -5
On the PCB, at the front right edge, there's a white adjustment pot, with wax sealing the top. I'd be willing to BET this is the factory trim adjustment. Be careful here. Since it's a radio controlled heli (as opposed to IR), there will be a radio receiver on board. These typically use a simple LC tuning setup, as seen on the board of this toy car...  On the right side of that board is a variable inductor, also wax sealed, that controls the frequency of radio reception. If you're going to play with the one on the Costco machine, you'll want to be sure that its not in the tuning circuit. If its anywhere near the antenna attachment point, it'll be the tuner. |
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Post by killbucket on Dec 17, 2010 5:28:20 GMT -5
Me wrong- it is.
endless fiddling got them to straighten out.
I think L/R trim is more of a drift-compensation or something.
Yeah, it bugs me to see the knob cranked over to one side. But the copter holds nose lock very well, so it's moot.
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Post by gamedude on Dec 18, 2010 11:01:48 GMT -5
I just exchanged this heli. I got sick of fiddling with it. The new one is the same model but I only need a slight right trim to get it to center, even when the batteries start to drain. It works much better. Thanks for all the info though. I took apart my new one and lubed the bearings, shafts, and gears, and now there's less friction so it operates better and i get a little more battery life out of it!
I noticed with this one that it tends to rock forward and backward for a second first when I go to move it forwards, but only if I give it full forward throttle right away. If I ease into it, it goes forwards smoothly. I assume that's just the way they work. Other than that it's fine.
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Post by killbucket on Dec 19, 2010 11:34:35 GMT -5
By its very design and nature, a coaxial must de-stabilize to fly forwards. They are the epitome of design compromise.
Nearly every part is critical-duty and the minimum that will suffice.
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Post by gamedude on Dec 19, 2010 13:34:28 GMT -5
I had it apart and tinkered with it some more, and now it only rocks slightly, instead of all over the place like it was before. Maybe I didn't have something put back in the exact spot last time I had it apart. Anyways, all is well now. I noticed that it turns to the left a little when you gain altitude at full throttle, but I guess that's just because one of the motors is very slightly faster than the other at full throttle. It's no big deal though, it hovers straight at part throttle.
BTW, I tried your mod by removing the stabilizer weights, and the helicopter now leans into turns and you can do more tricks with it! It also goes forward twice as fast. You need more room to turn though, since it makes wider turns. I guess removing weight from the stabilizer makes it less stable. Who would have thought? ;D
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Post by killbucket on Dec 22, 2010 13:09:26 GMT -5
The flybar and its weights are there to make the mainshafts stay pointed at the ground. This stabilizes the copter in one place, IF no air is moving IT.
The tail rotor on a 3-channel lifts or lowers the tail, effectively making the copter "fall off" its column of air, and travel as it does.
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