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I have not flown mine in some time, but I remember some of the settings in the manual are in correct. Travel is like 130 over 100. Something like that. There are some great post on helifreak, about ho to calbrate the escape with your Tx. The talon esc will do some wako things if not set set up properly. Also the motor leads get brittle, when twist then around, in the frame.
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Finally had chance to re-maiden mine. Initial flight crash required LG, TT, and front end tail gear (the one that meshes with the main gear, whatever that's called). Also didn't like the way the main bearings felt, so replaced upper and lower main bearing blocks with a Lynx set.
1st flight yesterday saw the heli acting a little sloppy, tail was wagging slowly. (gyro gain was at 75% per manual) On 2nd flight I bumped up the gain to 80%. Transformation! Suddenly the heli was precise and responsive! Does the gain setting affect all axes, or just yaw? Anyway, I am definitely liking this bird now. Dave |
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Quote:
FYI, I don't know if there is an actual ubiquitously accepted term for that particular gear. But I've always called it the tail PTO gear. Which stands for power take off. Because it is literally the gear that takes power off the main drive to also drive another rotor. Which is essentially the same terminology used with tractors and lawn mowers for how they take power off the central drive of the engine to power something like mower blades or other machines when it comes to big tractors and machines like that. The main difference on those kinds of machines vs. a heli is that helis cannot disengage and engage the PTO gear at will to turn on or off the tail rotor like you would mower blades. Otherwise it's basically the same mechanical concept. |
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I thought the radio gyro gain only controlled the tail, but the change in behavior was so dramatic it made me wonder. I haven't investigated the procedure to make adjustments to the flight controller's setup, so it's all kind of a mystery to me.
And I found the answer to what that gear is called -- it's this: BLH3421 Tail Pinion Gear/Shaft Page 13 in the manual. Are a lot of you guys replacing the main blades? |
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https://www.ebay.com/itm/Xtreme-Blad...EAAOSwZjJU~HUi https://www.ebay.com/itm/Xtreme-Blad...8AAOSwrklU~HTD |
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I took my 180 off of ebay as nobody was biting at the very reasonable price. I've decided to try again with her.
My problem is still the same thing - it hovers beautifully then drops 10 feet all of a sudden and completely randomly. If you move the servos on the bench you can actually see her doing it. The rearmost servo seems to smoothly go to her travel limit then 'snap' back in the opposite direction. It's as if I slammed the left stick down like a pitch pump. As previously posted, if she's not high enough, she slams into the ground. It's making me too nervous to fly her. I tried all the previous advice given about making sure the gear tabs were centered etc. I really hope it's not rx related. |
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rossi46:
Sorry you are still experiencing trouble. Maybe if you entertain a couple of my naive questions and observations you will be led to an answer You have observed the rear servo "snapping back". Do the other servos do this as well? If they don't, your heli would back flip into the ground, it wouldn't go straight down. If all servos move, trouble is probably not a servo problem. However, though I have never suffered it, I have heard of bad servos affecting other components of the system. Seems to me those are the choices -- bad servo, bad receiver. Without symptoms pointing clearly to one of several possibles culprits, I usually choose the least costly one first. Hope this helps. Dave |
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video of the behavior on the bench could be helpful in diagnosing the situation. I wouldn't be surprised if the one servo is bad and causing the issue. I had a elevator servo go bad on me once and it just wouldn't take off no matter how much pitch I put in. Then, all of a sudden, it shot into the sky at full bore and nearly hit me. This little guy just does weird things when servos go bad. Crappy part is they charge like $19 each for the servos.
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Well, *I* had an issue yesterday at the field. Flew 2 batteries, idle up 1 mode, no issues. 3rd battery, decided to go to idle up 2, bird gets very responsive! A couple of minutes into the flight, SOMETHING happened. Essentially lost control at about 10' altitude. Managed to hit TH at about impact. I found that the swashplate had separated! The upper rotating part appears to have pulled out of the lower half. Also noted cracked canopy and teeth missing on tail drive pinion, but TT seems OK.
I had assumed this mishap was due to poor piloting, but after mulling that over for a while I'm not so sure. That is, I don't know if the failed swash was cause or effect. The variable was running it at higher head speed, which I had never done. I certainly can't remember doing anything violent at the time of the crash. A separating swash would, I think, fit the behavior. Dave |
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Last edited by hancockdw; Apr 29, 2018 at 06:59 PM.
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