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Post by sgmason on Jul 14, 2012 12:18:56 GMT -4
I answered over on HF, but it was either the ESC blowing or a bad radio glitch. Either way the ESC went up in smoke bad enough to melt all the wires and caps off both ends. Here is the ESC
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Post by Dr. Evil on Jul 14, 2012 15:22:25 GMT -4
WOW....nasty looking! Is that the stock ESC?
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Post by sgmason on Jul 14, 2012 15:27:15 GMT -4
I bought the bare bones belt drive kit and got the Phoenixtech 115a ESC from ROVpilot. That is the nice looking side the other side the heat shrink is melted off and the heat sink is bare now. The actual damage to the helicopter is minimal, boom tube and flybar. I was going to replace the ESC anyhow in a couple of weeks this was just to get me going and didn't cost me much at all. Speaking of which, I could really use to win that GC now ;D While I am down I am going to do a couple of small upgrades to the undamaged parts of the helicopter. I want to say good bye to the plastic tail rotor holder and get the aluminum one. I think if I don't get it in the air the next time I am going to sell it and switch to airplanes Right now I am trying to find a video converter that wont mess with the audio track so I can show exactly what happened and get opinions on why it happened.
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Post by Dr. Evil on Jul 14, 2012 15:32:21 GMT -4
I bought the bare bones belt drive kit and got the Phoenixtech 115a ESC from ROVpilot. That is the nice looking side the other side the heat shrink is melted off and the heat sink is bare now. The actual damage to the helicopter is minimal, boom tube and flybar. I was going to replace the ESC anyhow in a couple of weeks this was just to get me going and didn't cost me much at all. Man....so sorry to hear and see but you get it back together! In the other hand, a good radio is a very good thing. I personally don't use spectrum but heard a bunch of good things on the 7s. You may consider the DX8 but not sure on the cost differences though. What radio are you using now?
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Post by Dr. Evil on Jul 14, 2012 15:36:49 GMT -4
I bought the bare bones belt drive kit and got the Phoenixtech 115a ESC from ROVpilot. That is the nice looking side the other side the heat shrink is melted off and the heat sink is bare now. The actual damage to the helicopter is minimal, boom tube and flybar. I was going to replace the ESC anyhow in a couple of weeks this was just to get me going and didn't cost me much at all. Speaking of which, I could really use to win that GC now ;D While I am down I am going to do a couple of small upgrades to the undamaged parts of the helicopter. I want to say good bye to the plastic tail rotor holder and get the aluminum one. I think if I don't get it in the air the next time I am going to sell it and switch to airplanes Right now I am trying to find a video converter that wont mess with the audio track so I can show exactly what happened and get opinions on why it happened. If the ESC failed right before you lost control, that would be your answer right there cause unless you're using a seperate lipo or running a external BEC to power the RX...you'll have no control over your heli once the connection is lost.
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Post by sgmason on Jul 14, 2012 15:37:20 GMT -4
I am using a CopterX branded Turnigy 9X, just one of the many factors that are keeping me on the ground. Up here in Canada the price difference between the two radios is $150, for 3 extra switch positions and a back light. To me that isn't a value upgrade.
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Post by Dr. Evil on Jul 14, 2012 15:39:05 GMT -4
I am using a CopterX branded Turnigy 9X, just one of the many factors that are keeping me on the ground. Up here in Canada the price difference between the two radios is $150, for 3 extra switch positions and a back light. To me that isn't a value upgrade. Ahh, agree. The DX7s will do the job fine, I just didn't know how much more for the DX8.
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Post by sgmason on Jul 14, 2012 15:41:08 GMT -4
I just finished converting the video, so all I have to do is a little editing and some slow motion so its easier to see what happens. I know that as soon as I lost it I killed the throttle, but it still kicked as I was walking towards the helicopter. When I saw the smoke start I ran towards it thinking I had lost a lipo battery and I didn't want the helicopter to burn.
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Post by Dr. Evil on Jul 14, 2012 15:43:44 GMT -4
I just finished converting the video, so all I have to do is a little editing and some slow motion so its easier to see what happens. I know that as soon as I lost it I killed the throttle, but it still kicked as I was walking towards the helicopter. When I saw the smoke start I ran towards it thinking I had lost a lipo battery and I didn't want the helicopter to burn. When you say you "killed the throttle", did you mean you just dropped/lowered the stick or did you hit throttle hold?
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Post by sgmason on Jul 14, 2012 16:30:03 GMT -4
Dropped the stick, for some reason when I hit the throttle hold on my Tx it goes to full negative pitch no matter how I set it. I took the pinion off and set the throttle hold to 100%, the only setting other than enabling it, and the pitch dropped but the motor didn't spin up. I decided that if something went wrong I would rather drop the throttle and have -2° than -15°.
I had gotten in the habit with my 4 channel of hitting the throttle hold and knowing what was happening with the pitch on the 600 I didn't enable it so habit wouldn't take over.
The video is uploading right now, so I should be able to post it in about 30 minutes or so.
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Post by sgmason on Jul 14, 2012 17:30:00 GMT -4
OK here is the video, after watching it a few times the sudden change it direction almost looks like the training gear was stuck in the grass. I do swear, but it is muffled. Evens so it can still be made out, just a warning It is in HD so you can see clearly even at full screen the slow motion at the end is 25% of normal speed
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Post by sgmason on Jul 14, 2012 17:31:08 GMT -4
Oh Dr. E I am running a separate BEC the CC BEC PRO
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Post by Dr. Evil on Jul 14, 2012 18:16:12 GMT -4
I've watched it over and over. I am not convinced that the grass was the issue. My take on this and with no disrespect at all, to me looks like during take off the heli started to drift to the left and maybe....just maybe it was over corrected and took a really hard sharp right into the ground. At 1:05 (timer), the landing gears looks to be clear of the ground but started to drift left. Again, please...not trying to disrespect you by saying that, it just looked that way to me. That being said, I have no idea why the ESC smoked?!?
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Post by Dr. Evil on Jul 14, 2012 18:21:06 GMT -4
Oh Dr. E I am running a separate BEC the CC BEC PRO OK...well, that clears up the fact that you should still had power/control over the RX/servos even if the ESC went to $hit. Atleast I believe we can rule that out.
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Post by sgmason on Jul 14, 2012 19:10:06 GMT -4
None taken, but I didn't try any correction, unless I did it without realizing it. My guess to what went wrong is purely electronic, three options; setup, glitch, ESC threw the brake on for a a second as it was failing or spiked causing a sudden increase in head speed. I wont rule out that I over corrected with out realizing that I was even trying to correct, anything is possible
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