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Blade 400 Blade Helicopters (eFlite) 400 Helicopters |
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08-26-2010, 04:00 PM | #1 (permalink) |
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what is better a 20c, 30c or 35c lipo
wanting to get some turnigy 2200 packs. i want the one that will give me the longest flight times.
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----------------------------------------------------------------- Blade 180 CFX, Sold the rest of my stuff, I dont really fly all that often any more. |
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08-26-2010, 04:09 PM | #2 (permalink) |
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Higher C packs can be discharged at a higher rate, meaning thay can discharge faster than lower C packs. The voltage will stay higher throughout the discharge, but the end will come sooner. That's one of the trade-offs.
So actually, higher mAh batteries with lower C ratings could last longer under certain conditions. An analogy: Gas engine, fuel tanks and fuel lines. Think of "mAh" as fuel tank capacity. Think of "C" as fuel line diameter. If the engine wants a lot of fuel, and large fuel line can deliver, then the tank will empty faster than if a smaller fuel line was being used. -John |
08-26-2010, 04:10 PM | #3 (permalink) | |
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also will the connector work, i know the 400 uses a ec3 connection to hook up the battery i see it says the charge plug is a Charge Plug: JST-XH i would guess that is the plug you use to connect the battery to the heli but not sure. http://hobbyking.com/hobbyking/store...idProduct=9805
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----------------------------------------------------------------- Blade 180 CFX, Sold the rest of my stuff, I dont really fly all that often any more. |
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08-26-2010, 04:19 PM | #4 (permalink) |
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The higher the C the more efficient the power will get to the motor. The guy at the LHS explained it to me like this. A 20c pack is like pouring water through the top of a water bottle, not a very steady, fast or efficient stream. A 35c pack is like cutting the top of the water bottle off, so more comes out at once. The pouring water equals battery power. The higher the C the more power to the motor, but because it is discharging faster you will have slightly shorter flight times.
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08-26-2010, 04:21 PM | #5 (permalink) |
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It depends on how you fly or discharge the pack. If you fly gently around you'll get the longest run time. If you punch it hard you'll get less. Just like a car - hard starts and stops will use gas quicker than slower starts and stops.
It's just that with a 20C pack the voltage will drop (RPMs drop too) when you punch it because the battery can't supply the higher current being requested from it - it only lets so many mAh out at a time. With a 30C pack the voltage stays higher (RPMs stay higher too) when you punch it because it has no problem delivering the extra current and will "run out" quicker if you punch it a lot. It's a trade-off:
If you have a higher C pack but fly gently you'll get just as much run time as a lower C pack (of the same mAh rating) - no more, no less. -John |
08-26-2010, 04:24 PM | #6 (permalink) | |
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ill probably go with the 20 c batterys than, one guy said he was getting 12 min flight times with a 20c 2200 turnigy battery, that would be great. i dont expect to get those kind of times but if i do that would be killer. my flight times have definitely cut down after adding new electronics. i can get about 5 min and 30 seconds and than i notice a loss in power. i was getting 7 min easily before i upgraded.
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----------------------------------------------------------------- Blade 180 CFX, Sold the rest of my stuff, I dont really fly all that often any more. |
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08-26-2010, 04:30 PM | #7 (permalink) |
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TURNIGY PLUGS
The Turnigy LiPos come with the right balance plug, but, the main battery leads are Deans T plugs. You can either cut 'em off and solder on EC3s or make up a Deans to EC3 jumper.
Hey Danny, do you have a pic off your GY520 install? I just ordered one today. Thanks! |
08-26-2010, 04:32 PM | #8 (permalink) |
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He's right about the rate thing - higher charge and discharge rates will consume/kill any battery sooner than slower rates. Just another trade off.
In general, a given battery subjected to high charge and discharge rates will die much sooner than if it were charged & discharged at lower rates. |
08-26-2010, 04:41 PM | #9 (permalink) | |
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not to mention you are already talking bout flips n rolls those eat batteries because number 1 you would b flying in IU. 100% throttle now the way the pack is explained to me.. was that the pack had a 25c discharge with a 35c burst .. which is only good for a few seconds at most it will not run @ 35c until it is demanded.. which is what cuts your times every time you roll it flip it those are burst when you demand the most from the packs, and aftermarket gear.. If you were going to fly slow n smooth.. no inverted flying or anything.. or just learning to hover but you are passing that stage
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Dx7s, exi 450 pro(I swear it's a trex by now lol) MSH Prôtos: 500 fbl,MSH Prôtos 450 fbl Blackout 250 ZMR 250 |
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08-26-2010, 04:49 PM | #10 (permalink) | |
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the guy at the hobby shop always hooks me up so i guess i should just let this slide, it should be here any day now.
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----------------------------------------------------------------- Blade 180 CFX, Sold the rest of my stuff, I dont really fly all that often any more. |
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08-26-2010, 04:51 PM | #11 (permalink) | |
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----------------------------------------------------------------- Blade 180 CFX, Sold the rest of my stuff, I dont really fly all that often any more. |
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08-26-2010, 06:29 PM | #12 (permalink) |
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what about ordering a few 20Cs and then get at least one 35C and then you can see what you like best.
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08-26-2010, 06:50 PM | #13 (permalink) |
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I have to disagree with the advice you are being given, DannyL.
The C rating multiplied times your Ah rating equals the constant amperage the battery can discharge. Most give a burst rating as well, for example: A 20C battery (with 30C burst) at 2.2Ah (2200mAh) will constantly discharge at 44A and 66A for a short duration (burst). Your stock ESC is only 25A, and you aren't running it as max current all of the time. Current, or Amperage doesn't force its way into a motor or ESC, it is drawn based on the internal resistance of the ESC and motor. So, you could put a 45C battery on a heli, but if the motor and ESC only draws 20A constant current and 35A peak, you just threw your money away. A higher C rated battery won't make the motor spin faster, only higher voltage will. A better ESC with a lower internal resistance (better FETs) will give you a noticeable improvement over stock, and probably run cooler. If you have a battery with too low of a C-rating (10C), it will overheat because the amperage draw from the motor and ESC will be more than the battery can discharge, due to internal resistance in the battery. I would buy 20C and save a sackful of money.
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08-26-2010, 07:37 PM | #14 (permalink) |
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Daddy B I DO NOT disagree with anything you said .. but I do use a aftermarket ESC and I put a draw on my ESC .., because after half stick I'm at 80% power and my upgrades no I have not put a amp meter to it .. I just know I do more than the stock was set up for . So yes I see the difference .. I know Danny a lil bit and he will b upgrading the ESC shortly..
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Dx7s, exi 450 pro(I swear it's a trex by now lol) MSH Prôtos: 500 fbl,MSH Prôtos 450 fbl Blackout 250 ZMR 250 |
08-26-2010, 09:02 PM | #15 (permalink) | |
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I guess I was thinking more of the case of the 2200 mAh batteries, which should be more than able to handle the draw of any 400 or 450 helicopter setup. Then again, you don't know if Turnigy and Zippy accurately rate their batteries!
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"There's nothing wrong with fast. You can always throttle back" -Flying field buddy |
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08-26-2010, 09:14 PM | #16 (permalink) |
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A higher C rating battery doesn't make the blades spin any faster - but it helps keep the voltage from dropping during punches, which in turn keeps the RPMs from dropping as well.
And no, current doesn't force it's way into the motor or ESC. If the ESC and motor "ask" for more current (ie. during a punch) then a higher C battery can deliver it without causing the voltage (thus RPMs) to drop. Continued "asking" for more current - and getting it - will simply result in a quicker discharge of the battery. -John |
08-26-2010, 09:29 PM | #17 (permalink) |
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If your motor can ask for more than the battery can deliver it is hard on the battery. Higher C rating is less likely to get hot or puff as easy as lower C rating. Running close to or above the c rating will shorten the life and eventually cause puffing and shorten life. And what those other guys said.
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08-27-2010, 03:22 AM | #18 (permalink) | |
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probably wont be upgrading the esc any time soon, it no longer gets hot after flying but the battery still do. 5 min flight times just wont do it for me. 20c flight times vs 30c flight times. can some one explain how much of a difference i will get in flight time between a 20 and 30
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----------------------------------------------------------------- Blade 180 CFX, Sold the rest of my stuff, I dont really fly all that often any more. |
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08-27-2010, 03:49 AM | #19 (permalink) |
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It all depends on what your motor and esc are asking for, but if you can use the extra energy the 30c battery is capable of producing such as an ICE 50 and a Scorpion 4600 and you are flying hard 3d you can pretty much knock off as much as 30% of your flight time as when you are using stock components with a 20c battery. This is very general but easier to understand.
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08-27-2010, 07:43 AM | #20 (permalink) | |
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http://hobbyking.com/hobbyking/store..._30C_Lipo_Pack also any one know where you can get a xt60 to ec3 adapter, the only one i found are the female xt60 to the the male ec3 i need it to be the other way around. i think these are the one i need. http://www.hobbyking.com/hobbyking/s...%283pcs/bag%29
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----------------------------------------------------------------- Blade 180 CFX, Sold the rest of my stuff, I dont really fly all that often any more. |
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