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Post by flydiver on Sept 13, 2011 15:33:02 GMT 1
Iv been useing my old lipos i used in the edf n im geting about 4-4:30mins each lipo but when i land after this time my lipos have swelled a little n become quite warm! Like i say iv used them in my edf n got them hot n puffy :-( so have i messed them up? Then charged my older one right after n it charged n stoped after 42mins...i dont understand what it was doing!! I told you before.... EDF = hell on batteries Now I'm telling you...... Helicopter = more hell on batteries Yes, you got them hot and overdrawn. That's what hot and puffy is telling you. This increases the internal resistance (screws them up chemically-permanently) and lowers their performance. After that it just gets worse as you continue to use them. You can ruin a battery in as little as a single improper use. The only thing those kind of lipos are good for is LOW performance applications, not EDF and Helis. Unfortunately if you are going to play with those kind of toys you are going to have to throw lots of $$$ at HIGH-C rated lipos of GOOD quality. Figuring out WHICH lipos to choose can be a bit of a problem. You can get lots of opinions but little hard data. Since there are so many people with so many different demands and flying styles (as well as knowledge) most of those opinions are kind of useless. Have fun figuring it out. ;D (Hint-you probably won't find it in a Super Cub thread) The charging took a long time because they are trying to balance and having a hard time doing it due to the damage. This is characteristic of batteries going 'over the hill'. |
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bo54
Flying officer
Posts: 24
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Post by bo54 on Sept 13, 2011 21:01:01 GMT 1
I started out in helis, I have 2 Blade 400s, the old version. It took me a long time to level the swash plate, I see yours seems to be pre-flight tested. I notice that you are hovering in the ground effect area (too close to the ground), this will cause you heli to squirm all over the place. Be brave and bring it up to about chest high, it took me over a year to get enough nerve to turn left and right. Here are my videos, now after a few years, I feel almost comfortable: www.youtube.com/watch?v=ielijNrgWnMAlso, this web site is where I received tons of info about the Blade 400, I'm sure they have the new 450 as well: www.rcgroups.com/forums/showthread.php?t=1335273&page=12I see your batteries are heating up, the cheaper ones are not always perfect. I played with the throttle curve for a while, in warm weather, the batts will get warm, DON'T CHARGE THEM WHEN THEY ARE WARM. let them cool down, the ESC will get warm also, takes a while. Enjoy. |
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Post by pauliepilot on Sept 14, 2011 12:08:28 GMT 1
Thanks halkeye iv bookmarked it,flydiver i thought that the heli wouldnt draw as much ampage!!
I have two new 2200 25c lipos in sleep mode should i use these in the heli or not?
And use 50% first time i use them say for 3mins then second use 60% with 4mins use!or get some 2200 60c at £30 each!
bo54...nice vid :-) n the bloke in my lhs said only hover about a foot of the ground just incase u have to drop power...it shouldnt damage it to much at that hight!
He's allso the one who said these lipos would work fine!!
Thanks for all the kind words of wisdom i'll keep u updated thanks again paul :-D
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Post by flydiver on Sept 14, 2011 15:29:38 GMT 1
Cant' advise you on the particulars of using an "unknown' lipo in a motor I don't know.
A good way to approach it is as you describe-fly a few minutes > check it for heat and remaining capacity.
2 things to remember - the marketing on lipos is often garbage. Frankly, I take recommendations from LHS employees/owners with a lot of skepticism unless I've ascertained they know what they are talking about, which is seldom.
The other problem is lipos are often moving targets. Great brand names occasionally end up with a run of clunker lipos. Then a new brand comes out of the blue, is wonderful, and a good bargain. With the internet communication now this causes a stampede to the product, it soon becomes oversold, and out of stock. Then they can't keep up production and quality goes bad. Happens all the time.
Hardly ANY of the various BRANDS make the the cells. The cells are bulk purchased from manufacturers, assembled, and 'stickered/covered'. So it depends on WHERE the cells came from, how well they were matched, and how well assembled.
For instance, people seem to love HK Rhinos (2S/1000mA). I have some that suck. Never been abused, or overdrawn. They balance terribly and go out of whack with little provocation. Other sizes in the same line may be fine.
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Post by pauliepilot on Sept 14, 2011 18:40:44 GMT 1
Thanks again fly I use overlander 2200 3s sport 25c motors an eflite 420 3800kv,just had a flight with the old pack reduced my flight time to 3:30 n its still quite warm n a little puffed :-( like u say abused in my edf
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Post by flydiver on Sept 14, 2011 19:25:54 GMT 1
Not familiar with overlander. If marketing is up to par then 25c is MAX, 20C should actually be max, and you probably shouldn't use them over 15C > 33A.
That motor:
Continuous Current: 25A
Maximum Burst Current: 32A (15 sec)
Again, if used as 'usual' you are right up that at max rating, meaning close to what the battery is 'maybe' capable of.
Now, since it's actually getting hot and puffy it means it was either previously damaged or is not up to the stated specs at all.
You may need to go to the [Extreme] series or another (better) high-C lipo.
In a Cub, it might be a fine lipo. For this application, apparently not.
Once a battery is puffing and hot it is at the beginning of the way out. 140*F is the usual damage point. If you can't hold it in your hand, it's too hot.
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Post by pauliepilot on Sept 14, 2011 21:49:42 GMT 1
Yeah they have been to hot to put in my pocket befor now"edf" killed them :-(
I'll wake my new ones soon and see if they get puffed if so i'll get the overlander 2200 60c for the edf n heli...had a nice hover left right fowards and bk at waste hight :-) bit windy tho
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Post by pauliepilot on Sept 15, 2011 14:50:56 GMT 1
Charged my new 2200s n went to the field not my bk garden :-)
Used my old lipos first 3.30mins each..then my new one's i flew the same time..they got a little warm but no puffing/hot :-)
Fowards flight/bkwards flight had it about 14ft high in hover...think im geting the hang of it now
Easyer at a big field tho :-)
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Post by toff on Sept 15, 2011 22:10:26 GMT 1
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Post by flydiver on Sept 16, 2011 1:06:53 GMT 1
Those Turnigy have a pretty good reputation, better than the similar Nanos.
Warm is OK and fairly normal.
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Post by pauliepilot on Sept 16, 2011 11:58:16 GMT 1
Thank guys...bit windy today n i dont want to smash it up :-) i no what im like lol
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Post by pauliepilot on Sept 17, 2011 19:09:13 GMT 1
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Post by pauliepilot on Sept 20, 2011 16:48:35 GMT 1
Update...no problem with wind now,full power forward flight- zigzag flights-swaying left-right,
Weathers pants today so no flying for me :-(
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