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Home✈️Aircraft🚁Helicoptere-SABGoblin 700 › 45C vs 65C for my new Goblin 700
03-21-2016 01:49 AM  4 years ago
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AaronBmore

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baltimore,md, usa

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45C vs 65C for my new Goblin 700
Am buying a Goblin 700 and am pricing batteries.
Looking at:
$280 for 2-6s 45c 5000mah thunderpower
Or
$340 for 2-6s 55c 5000mah pulse.

My question is am i going to notice the difference in c rating when I'm flying the crap out of it?

Will the heli maintain headspeed just as well with either battery set?
Thanks,
Aaron.
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03-21-2016 02:11 AM  4 years ago
Heli Fanatix

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Fountain Valley, CA

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If it's pulse batteries, you WILL feel the difference.

But if it's between Pulse Ultra 45C or Optio Power 30C .... The Opti Power packs a bigger punch!
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04-09-2016 11:52 PM  4 years ago
Anon0942

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Personally I wouldn't buy thunderpower packs at all, their overpriced and only give you half the performance pulse can. I just bought 2 new 6s 5000mah 65c packs for my Goblin 700 and they are rock solid, way better than my 45c packs I used to have.
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04-10-2016 12:52 AM  4 years ago
rcflyerheli

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Granbury, TX USA

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IMHO, it will all depend on just how hard you fly and load up your system. Unless you are a hard smack pro flyer, I really don't think you will see any difference between 45c and 65c.Logo 700, Specter 700, Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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04-10-2016 02:03 AM  4 years ago
Blackhawk6

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Trenton, Mi

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Like RC said, it all depends on the type of pilot you are. If you're mainly a sport pilot and don't push the limits with your system you won't notice the difference between 45/65c packs so save yourself a few bucks and go with the 45c. If you're a hard pilot you can most definitely notice the difference in punch that the higher rated packs offer...Team XpertUSA
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04-10-2016 08:02 PM  4 years ago
egiraldo911

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McKinney, TX - USA

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Look at the specs of the motor. That determines your amperage needs. If you have a motor with a max power output of 4500 Watts, that's 100A Max. For 5000mAh capacity LiPo's, 100A/5Ah = 20C. So you would need at least 20C to run that system. You want some headroom though, like 30C for this example. Some motors can peak at 10,000 Watts for a couple of seconds, for those type of motors, you will need at least a 45C LiPo. That's is 10,000W/44.4V = 225A. 225A/5Ah = 45C. As you can see, it all depends on the motor and how hard you really push that motor. If you have the ability to push a motor to need 225A, then you need a bigger lipo like a 45C. So the 65C might just be a waste of money.Is not the size of your heli that matters, is how you fly it!
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04-10-2016 08:44 PM  4 years ago
crespo1

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parksville new york

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I have both and I fly big air and mild 3d and no diffent
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04-10-2016 09:07 PM  4 years ago
rcflyerheli

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Granbury, TX USA

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I don't really think the motor itself will drive the battery requirement. It's how you push the motor. If you have a 10,000w motor and all you do is hover, then you won't require any more power than a 4,000w motor.

If you push each one to it's limit, then of course the 65c would handle the more powerful motor better than the 45c.
Logo 700, Specter 700, Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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04-10-2016 09:31 PM  4 years ago
egiraldo911

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McKinney, TX - USA

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Correct, that's what I said, it all depends on how hard the motor is pushed to that limit. However, knowing the specs of the motor is imperative when choosing your lipos and ESC.Is not the size of your heli that matters, is how you fly it!
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04-11-2016 03:33 PM  4 years ago
Richardmid1

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Leeds, England

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These topics make me laugh. Ever heard of advertising hype?

First of all, different manufacturers have different ways of testing their packs so a 45-90C pack MAY have reached 90C discharge for like 5 seconds then burst into flames! On the other hand a 30-60C pack may have been tested at 60C for 10 seconds multiple times.

C ratings sell batteries and the manufacturers know this!

Secondly the majority of packs come with cable incapable of such discharge numbers!

Keep buying expensive packs and they will keep being expensive!

BUY TURNIGYS!! The ratings on them are from the actual cell manufacturers not from the people who wrap them up in fancy heatshrink and stick ridiculous C rating lables on them and put metal plates in them so you think they never puff!! haha!

The trick is to check your packs for balance and impedance BEFORE you have soldered connectors on and the pack if you are not happy for a replacement.
60% of the time, it works every time!
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04-11-2016 03:39 PM  4 years ago
Richardmid1

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Leeds, England

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Some motors can peak at 10,000 Watts for a couple of seconds, for those type of motors, you will need at least a 45C LiPo. That's is 10,000W/44.4V = 225A. 225A/5Ah = 45C.
Remember the 45C rating (it won't be!) is continuous (tested till the pack drops to 3v/cell I think) but those packs will have a burst rating of 90C for 5-10 seconds (again it's doubtful!).

A very hard 3d flight of 4 minutes will average only 60A current draw! A 20C 5000 pack can do 100A continuous! Still think you need 65C?!

If you usually get 5 minutes out of your 5Ah helis, that's only 48A average!
60% of the time, it works every time!
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04-11-2016 03:48 PM  4 years ago
egiraldo911

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McKinney, TX - USA

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Remember the 45C rating (it won't be!) is continuous (tested till the pack drops to 3v/cell I think) but those packs will have a burst rating of 90C for 5-10 seconds (again it's doubtful!)
Do all LiPo's have a burst C rating above what's listed as C rating in the label? I know Trunigy Nano Techs list the burst ratings, but not Pulse.
I have some 5000mAh 35C LiPo's I want to use on a Goblin 770. That should be 175 Amps continuous then, correct? Thanks
Is not the size of your heli that matters, is how you fly it!
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04-11-2016 04:11 PM  4 years ago
Richardmid1

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Leeds, England

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Yes they all have a burst rating but again different manufacturers test the burst over different times, some for only 4 seconds which is why some burst ratings are double the continuous rating, some 10+ seconds.

Yes theoretically a 35C 5000 packs can manage 175A continuous.
60% of the time, it works every time!
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