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Electric Helicopters Dedicated to larger than Micro/Mini Electric Helicopters of any Brand |
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05-10-2011, 09:35 AM | #1 (permalink) |
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need help figuring this out
So, a week ago I crashed my new Tarot 500. I finally got it fixed today replacing a few parts, including main blades and set it up fresh. Swash level, blades balanced, everything was fine. Went outside to try her out and she spooled up nice and went into a hover and tracking was good too. Hovered through the whole battery, all is just peachy. About an hour later I decide to go out again and hover her through another battery. I got her about two feet off the ground, nice and steady, all of a sudden she just went into the ground, straight down. It was like I hit full negative pitch. I have no idea what happened. I was in normal with pitchcurve 42-45-50-75-100. I looked the bird completely over and the only things damaged are the new main blades (completely toast) and the bearing seal was out of the swashplate. I don't know if it came out because of how hard the heli went down or what. Nothing else happened, no ball links damaged or disconnected, servos move the way they're supposed to, everything works the way it should. I noticed that the throttle hold switch was on on the TX. I don't remember flipping the switch (still used to flying FP). I wonder if it somehow was in between positions and finally just went into hold. Either way it shouldn't have gone down like it did. The pitchcurve is the same from midstick up (0-25-50-75-100) and since I was hovering I was past 50%. The blades must have hit the ground since they are toast, especially underneath. Now I'm kinda hesitant to put new blades on and try again since I don't know what caused it. I just can't figure out what happened, AND can't figure out why nothing but the blades got damaged. Any ideas?
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05-10-2011, 05:02 PM | #2 (permalink) |
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Ok, something is not right. I did notice this from the beginning, but didn't bother worrying until the crash happened. FYI, my cyclic servos are Hitec HS225MG. When I first spool up the heli, at some point the aileron servo will pull down for a sec, then going back to normal. I also noticed that for the first 30 sec of hover the bird will "twitch", meaning it will suddenly rise about 6 inches, and after a few more seconds fall a few inches. After the first about 30 seconds everything will normalize. I set the bird back down and cut the throttle. I let the rotor stop completely and spool back up, the aileron servo does NOT do this again and the heli does not "twitch" anymore. It flies the way it's supposed to. This repeats on every battery. I just replaced the cyclic servos but only went from nylon to metal gears, HS225BB to MG. And yes, it did this with the nylons too. In the video you can clearly see the swash moving down on the right at about the 15 seconds mark. Why would it do this???
[ame]http://www.youtube.com/watch?v=92K_M1cWjHk[/ame] |
05-22-2011, 03:47 PM | #3 (permalink) | |
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Quote:
__________________
No one really knows how helicopters fly?? No wonder this has taken me some time to figure out |
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