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Model Forum / Radio Controlled / Air Models / November 2003Bent battery :)
Hello; Well, the Bee was in a pretty good-sized mishap some time ago... Happily, all the damage to the airframe has been repaired, pending one aileron servo, but my battery pack has a slight bend in it two fifths of the way up. It's made of two lines of five Sanyo 2400 mAh NiMH cells, soldered or welded end-to-end. The bend is about three degrees. It still provides power, but naturally, I hesitate to send up a four-pound plane on such a questionable battery. I'm wondering now, if the connections could have survived the bend; if anything else gave way (such as the ends of the cells having been pulled loose); and is there anything I can repair in there. I think I could replace the soldered joints, if I could successfully get them unsoldered. How would you proceed? Try to repair this battery, or chuck it and replace the whole thing? Or, would you even dare to test the battery under load and, if successful, put it back into service? Waiting on pins and needles... Thanks, Dan. >How would you proceed? Try to repair this battery, or chuck it and replace >the whole thing? If the bend is across the cells, definately replace the whole thing. If the bend is lengthwise to the cells, open it, check the joints, and test each individual cell. Dr.1 Driver "There's a Hun in the sun!" One question: Is the cost of a battery worth the cost of something going very wrong?  SignaturePaul McIntosh Desert Sky Model Aviation http://fly.mcintoshcentral.com > Hello; > [quoted text clipped - 18 lines] > Waiting on pins and needles... Thanks, > Dan. > One question: > > Is the cost of a battery worth the cost of something going very wrong? Depends on whether a model with no power and no control is very wrong I suppose. If its a chgeap foamie in an isolated place, you can always enter it for 'crash of the year' award. I still maintain that my most uniquely stupid crash was stepping sideways to get a tree out of my line of sight for an approach, and falling in a dyke.. "The Natural Philosopher" <a@b.c> wrote in message > I still maintain that my most uniquely stupid crash was stepping > sideways to get a tree out of my line of sight for an approach, and > falling in a dyke.. I was flying at another club's site while on vacation, and I had a very unusual "almost" crash. It was at the Myrtle Beach field; some of you might know the old site, but I think it no longer exists. The site was built right next to the city sewage treatment plant, next to the sludge ponds. Thankfully, the wind almost always blows away from the pond. <g> There is a dyke that encloses the pond, and it is above the field level, and I have never gone to look on the other side. The dyke is on long final, and I was landing, still not much removed from a newbie, and I did not have the depth perception I needed. I had a bit more sink than I needed, and was further out than I thought. All of a sudden, my trainer disappeared below the dyke. I thought I had bought the pond, and was in a sh*ty situation, so I turned to one of my guests to see his reaction, and I saw in his eyes, a very excited reaction. I turned back, and my plane had bounded off the far side of the dyke, and had reappeared in the air, still barely flying. I poured the gas to it, and pulled the stick to level flight, and it mushed through the air, and finally started flying again. Moral of the story: When you are in about to be in deep sh*t, wait until you see the splash before you quit flying the plane! <g> SignatureJim in NC That was a real gas! Joe L. >I was flying at another club's site while on vacation, and I had a very >unusual "almost" crash. It was at the Myrtle Beach field; some of you might [quoted text clipped - 18 lines] >Moral of the story: When you are in about to be in deep sh*t, wait until >you see the splash before you quit flying the plane! <g> > That was a real gas! > Joe L. [quoted text clipped - 21 lines] > >Moral of the story: When you are in about to be in deep sh*t, wait until > >you see the splash before you quit flying the plane! <g> Was that dyke Ellen DeGeneres' friend? Ellen Degenerate? SignaturePaul McIntosh Desert Sky Model Aviation http://fly.mcintoshcentral.com > > That was a real gas! > > Joe L. [quoted text clipped - 23 lines] > > Was that dyke Ellen DeGeneres' friend? Thanks for the input, everyone; Yes - intuition would say "pitch it and get a new battery", but at sixty bucks a pop, I decided to at least peel back the shrink-wrap... As it turns out, the cells aren't welded solidly end-to-end like I'd imagined they were; there are tabs between each pair of cells, which absorbed most of the shock. So it appears the only damage was stretching the shrink-wrap a bit... I'm going to put on a new layer of shrink-wrap, and pending some more bench testing, see if she'll fly again. Thanks, Dan. > Hello; > [quoted text clipped - 18 lines] > Waiting on pins and needles... Thanks, > Dan. |
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