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Electric Stunt => Gettin all AMP'ed up! => Topic started by: Robertc on July 24, 2010, 04:53:13 PM
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I tried a new setting on CC Phoenix 45 today and got it all wrong. Motor took off at around 12,000 RPM and the flight was VERY fast
Didn't want to fly around in fast circles, so I tried doing a soft pattern at 70 degrees. On the last corner of the inside squares, the battery
flew out. Ended up going over 50 yards away! Battery was bent and puffy. I didn't trust taking it home. A friend that works with LiPos at work
said if he hit with a screw driver, it would blow. I don't recommend doing this, but he went ahead and did it in the middle of the desert on a concrete
pad. Took a picture of the fire for all to see. Didn't burn like I thought it would, as I expected a big flash and tall flames. Instead, a lot of smoke and HEAT.
I can see if one of these went off in a house, even in a safe place, the smoke damage alone would be major.
I will now re-think my storage of these batteries.
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Robert,
What change did you make in the ESC, it seems like the rpm must have increased the amp draw to puff the battery. I have had a significant increase in amp draw (like 6 amps) with only 200 increase in rpm. I was able to drop the amp load by reducing the prop diameter 1/2" (12" prop). Didn't seem to hurt the lap time or speed in maneuvers. How many flights did you have on the battery?
Best, DennisT
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What damaged the battery was being thrown out of plane going about 75mph and hitting the ground.
I was about 1 1/2 minutes into the flight....
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OUCH! :'( :'( :'(
Can you share some details on your battery installation? I am hoping you can share what you did so it can be a "lessons learned" for the rest of us...
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I thought that was your burger, Robert.. ;->
L.
"Survival kit contents check. In them you'll find: one forty-five caliber automatic; two boxes of ammunition; four days' concentrated emergency rations; one drug issue containing antibiotics, morphine, vitamin pills, pep pills, sleeping pills, tranquilizer pills; one miniature combination Russian phrase book and Bible; one hundred dollars in rubles; one hundred dollars in gold; nine packs of chewing gum; one issue of prophylactics; three lipsticks; three pair of nylon stockings. Shoot, a fella' could have a pretty good weekend in Vegas with all that stuff." -Major T. J. "King" Kong
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My battery is held in place with velcro, to keep it moving fore and aft, and a ply plate to hold it from moving up and down. My ply plate
was missing from a take apart session at home the week before, so I substituted a force fit piece of plastic I found at the field. I'm sure that piece of plastic was not up to the task at the speed and Gs I was
pulling. Nothing else was missing or damaged.