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Old Nov 04, 2004, 12:43 AM
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Lipo explosion on video

Notr sure what the deal here is but this shows you how bad things can get if you don't follow the instructions. Very impressive. This was on Subcommitee.

I also build Subs.

Here's the post and the video. Don't do this at home! LOL

steve

I've seen a number of questions here regarding the use op LiPoly batteries in subs. I've always advised against them but now I can show you guys why.
Movie is 9mb and takes quite a while to reach the climax but worth the wait. You would not want this to happen in your expensive boats.
http://ludwigdanninger.de/Videos/Son...Explosion2.mpg

EJK
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Old Nov 04, 2004, 01:48 AM
go fly! no crashes!
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no need for depthcharges!
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Old Nov 04, 2004, 01:56 AM
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no need for depthcharges!
LOL!!!!!!!
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Old Nov 04, 2004, 02:07 AM
go fly! no crashes!
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hmmm, single cell 340 pack put into a small ok ok i better stop thinking.....
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Old Nov 04, 2004, 02:09 AM
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You nut!!!!!!
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Old Nov 04, 2004, 02:28 AM
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Hmm.. Not good. exactly why i've got no cobalt dioxide lithiums.

can't wait to try 2nd generation Saphion lithiums, no fire potential! well very very very little.

Alex
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Old Nov 04, 2004, 11:00 AM
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Steve, sounds like water & li-poly don't mix, nor for that matter U-boots & Pb-acids & etc.......

I remember sticking a NiCd cell into my trouser pocket once. You guessed it,

Don't mean to make light of this subject. Li-Pos in airplanes can also be a disaster if there is a sudden downpour. Safety shud always be foremost in ones mind when playing with fire!

Phil
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Old Nov 04, 2004, 11:30 AM
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Someone else has money (and lipolys to burn)

Like the old joke: "Don't be a Dick!"

Proper and safe use of any technology means following the proper procedures.

Same went for nicads when they first came out (dating myself there), and when turbines went into ducted fan models.

Dropping the equivalent of several hours (or a day or two) of gross wages into a battery pack is going to make me very cautious about abusing the suckers.

Abuse a dog long enough, and you'll get bit! (Robert Heinlein as Lazarus Long)
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Old Nov 04, 2004, 11:39 AM
It wasn't me...
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Quote:
Originally Posted by U812
Notr sure what the deal here is but this shows you how bad things can get if you don't follow the instructions. Very impressive. This was on Subcommitee.
Reading the responses on the Subcommittee thread, it's explained that the video came from a German modeler who intentionally overcharged his LIPO pack because he wanted to see (and presumably capture on video) a LIPO explosion.

While the video is dramatic, it doesn't show anything we haven't known for a while --if you overcharge a LIPO it will burst with smoke and flame.

So, the only thing this video really shows is that you shouldn't intentionally overcharge your LIPO while it's in your sub.

I can't see a reason why LIPOs couldn't be used in a sub.

Dan
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Old Nov 04, 2004, 12:19 PM
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Some food for thought,

One item I found interesting is the amount of smoke that is released prior to the pack exploding. Seems to me that a good strategy would be a large enclosure around a charging container, that contains a smoke detector wired to some type of "Power Disconnect" devise for the charger.

Even though the shut off will be late, and I'm guessin ghte pack will explode anyway, you would alteast be alerted to a pending fire.

Perhaps a plastic bag filled with sand could be suspended over the charging container whihc would burst from the flames, and release its cargo of sand
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Old Nov 04, 2004, 01:23 PM
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nice video steve.


see ya at the fun fly.

Gene
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Old Nov 04, 2004, 02:45 PM
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I'm just going to use nimhs on this one.

Steve
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Old Nov 04, 2004, 03:52 PM
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Quote:
Originally Posted by rcjetpilot
Some food for thought,

One item I found interesting is the amount of smoke that is released prior to the pack exploding. Seems to me that a good strategy would be a large enclosure around a charging container, that contains a smoke detector wired to some type of "Power Disconnect" devise for the charger.

Even though the shut off will be late, and I'm guessin ghte pack will explode anyway, you would alteast be alerted to a pending fire.

Perhaps a plastic bag filled with sand could be suspended over the charging container whihc would burst from the flames, and release its cargo of sand
There may be a problem with this idea, I remember hearing about 'themal runaway' or something that suggested once the lipo gets to the stage of letting off smoke like that, even if you take the power supply away, it will continue to heat up and explode.

Still worth a try maybe

Grant
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Old Nov 04, 2004, 03:57 PM
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Oops sorry Rcjetpilot, I just replyed after reading the first bit of your post, then I read the rest. So yes I agree with you, is what I'm saying The cut off would be a bit late.

Grant
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Old Nov 04, 2004, 04:08 PM
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I can't help but think that using the thermal probe that is available on some chargers would stop this kind of thing, even if you accidentally set the charger for the wrong kind of battery.
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