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This is true for all but Nanotech batteries. Don't pay for that junk. I ordered 5000mAh Nanotech and it puffed after 3-4 flights in Skywalker! Peak current is around 42 Amps for few seconds after start, standard flying power comsumption is around 11A... Low (20-25) C-rate Zippy are much better...
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Agreed...recently switched to NanoTech 60C plus ratings.
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Not everyone sets up their SW's to be "loiterers" If you can't tell this by now it is a pet-peeve of mine. The goal isn't to make the lightest and wimpiest SW out there like so many brag about. And adding those new huge wings takes this to a whole new level of bobbling around like a butterfly in the sky. Some of use like to reinforce the SW and fly more aggressive. While I can sludge through the air at 11amps I typically fly more aggressively in the 20amp range while proximity flying etc. I often hit 40amps several times during a flight and in the 50's on launch and/or aggressive climb. And with all of that I still stay airborne for close to 40mins on a 5000 4S. High C rating batteries are a definite plus!
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Flying at 20-40A versus 7-10 doesn't change the fact that you absolutely
positively don't need a battery rated for 300A. My X8 pulls up to 65A, and still runs just fine on 25C 5000mAh packs. And high C packs don't hold any more capacity than low. The only way to get 40min out of a 5000mAh pack of any C rating is to average about 7.5A draw over the whole flight. The only place you can see any difference is if you're trying to run full throttle down into the last 20% of the pack's capacity and then there'll be a little faster voltage sag as it goes over the "knee" in the curve. I don't own any Nanotech packs. Maybe they're just junk and will really puff after 3-4 normal flights, but I really doubt it. ian |
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Last edited by Daemon; Aug 22, 2012 at 01:44 PM.
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It's not only with 5000mAh Nanotech - I'm flying also MaxiSwift with 2x2200mAh 3S Nanotech batteries. They are puffing like popcorn - I've just made a little photo. From left to right: Zippy, not puffed at all, few flights only to the left, in the middle is a little puffed Nanotech, few flights only (the same age and using as Zippy), to the right Nanotech with cca 10-15 flights - not usable anymore... Peak current of my MaxiSwift is 36A, standard flying current cca 11A.
My 5000mAh Nanotech in skywalker is now only slightly puffed, looks like the battery in the middle. But I can't recommend buying this - I was thinking "the more C-rate, the cooler and less puffed battery". Forget it... |
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I never discharge batteries under 3.3V under load. Battery warning is set to 10.5V. So I always charge less then 2000mAh. I have never such problem with other battery brands than Turnigy (my 30-40C 3600mAh were pretty bad, too) - but those Nanotechs are worst of them all. I bought them three times, so it can't be just a bad serie. First I thought it's because of my parallel connection, but also my Nanotech in tricopter get puffed and now the one in Skywalker... I don't trust them anymore.
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That one on the right is a goner...it's time for the recycling plant
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As an aside, I read recently that one of the companies researching ultra long range, solar augmented surveylance aircraft are putting a good deal of research into LiPo batteries of under 1C discharge rate. These are the ultimate loiterers. Must really get under your skin Adam Cheers, Sub |
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Hi,
I fly FPV with a Zephyr from some months.. It's a great plane but sometime, on occasion, I need a plane more calm for a relaxed FPV tourism. For this reason I'm interested to buy a SkyWalker. I would ask if it's better to buy the 168cm or 190cm version ? Who owns them could tell me the strengths and weaknesses of the two versions ? thanks |
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