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› 20C and 30C what is the difference
10-19-2009 08:35 PM  8 years agoPost 1
ScottV

rrApprentice

El Dorado Hills, CA

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Hey everyone,
I have been trying to read up and understand lipo's which is not easy for a first timer to them. What is the difference between 20C and 30c, I have had both of those suggested to me and not sure what and why are they different other than the cost.

thanks for any assitance

So long and thanks for all the fish!
`·.¸¸.·´¯`·.. ><((((º>`·.¸¸.·´¯`·.¸><((((º>

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10-19-2009 08:48 PM  8 years agoPost 2
MrMel

rrProfessor

Gotland

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the 30C can deliver power more rapidly then the 20C without harm, well, that's in theory, unfortunally the Lipo manuf (some of them) use it to sell.

Anyway, if you compare two of the same brand its most likely you will get more cycles out of the 30C since it wont be used as hard as the 20C.

But if your only beginning flying (hovering, sport etc) even the 20C will last longer then the heli anyway.

for a 5000mah pack, 1C = 5.0A, 10C = 50amp, 20C = 100amp.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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10-19-2009 08:53 PM  8 years agoPost 3
Heli 770

rrProfessor

USA.

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How did you arrive with those C ratings?

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10-19-2009 08:54 PM  8 years agoPost 4
MrMel

rrProfessor

Gotland

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Edited... a full day out in the woods hunting, head isnt at 100% speed

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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10-19-2009 08:55 PM  8 years agoPost 5
Wingman77

rrProfessor

Pulaski Tennessee

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yea dude 1c on a 5k pack = 5a not 5.5a

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10-19-2009 09:02 PM  8 years agoPost 6
TJinGuy

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Socorro, NM - USA

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for a 5000mah pack, 1C = 5.5A, 10C = 55amp, 20C = 110amp.
Actually C = 5A for a 5000 pack, so a 20C pack can output a maximum of 20C or 100A (20*C = 20*5A = 100A). Whereas a 30C pack can output a maximum of 150A (30*C = 30*5A = 150A).

So as you can guess the higher the C rating the higher performance the pack is but at a cost, or several actually. First is money as they cost more. Second they are larger, so they may not fit as well. And third is weight, so they may not allow the cg to weight out easily. The benefits are several also though. They hold voltage better under load so they offer better head speeds. They also work less hard so they run cooler and that can increase the life of them.

Like Mel said if you are just starting out then a 20C pack will suffice. You will be wearing your first packs out learning to hover so there is no reason to spend the big bucks on high end packs. Then later on you can step up to a higher performance pack if you need it.

Along the same lines ... if you are just starting out then you don't need name brand packs either. Packs like Zippy, Mega Power and others are great first packs and are cheap.

- Chris

Team New Mexico
TJinTech

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10-19-2009 09:03 PM  8 years agoPost 7
ScottV

rrApprentice

El Dorado Hills, CA

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So if I am getting this right, the higher the C the faster the electricty flows to your bird. So in turn that would make your batteries have a shorter run time per charge. And since I will be doing only hovering and some forward flight the 20C would be good enough. But if I get the 30C I will be able to get more charges out of each battery and the batteries will last longer or will be able to take more charges?

I will be using the batteries on a new 450 sport. I was planning to get the Turnigy 2200mAh 3S 20C Lipo Pack.

Years ago I flew a Raptor 30 so trying to understand all the lipo stuff is a little challenging at first.

So long and thanks for all the fish!
`·.¸¸.·´¯`·.. ><((((º>`·.¸¸.·´¯`·.¸><((((º>

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10-19-2009 09:05 PM  8 years agoPost 8
MrMel

rrProfessor

Gotland

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Another thing, its more important to spend money on a good charger (safer too) then spendning lots of money on packs.

ps: (at least give me 30 seconds to edit before you start quoting )

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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10-19-2009 09:06 PM  8 years agoPost 9
MrMel

rrProfessor

Gotland

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will be using the batteries on a new 450 sport. I was planning to get the Turnigy 2200mAh 3S 20C Lipo Pack.
If your not into 3D, I say that's a good option to start with.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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10-19-2009 09:12 PM  8 years agoPost 10
ScottV

rrApprentice

El Dorado Hills, CA

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For my charger I ordered a Cellpro 4S.

Thanks for all the help everyone.

So long and thanks for all the fish!
`·.¸¸.·´¯`·.. ><((((º>`·.¸¸.·´¯`·.¸><((((º>

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10-19-2009 09:18 PM  8 years agoPost 11
TJinGuy

rrProfessor

Socorro, NM - USA

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So if I am getting this right, the higher the C the faster the electricty flows to your bird. So in turn that would make your batteries have a shorter run time per charge.
Not exactly. The higher the C rating the more potential electricity (current really) can flow. This gives you option of drawing out more current if you want. The power system will draw what it needs in relation to what you ask of it and the C rating will not have an impact on that until you start to crank up the performance. So for basic hovering the 20C and 30C packs will last about the same length of time.

- Chris

Team New Mexico
TJinTech

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10-19-2009 09:25 PM  8 years agoPost 12
ScottV

rrApprentice

El Dorado Hills, CA

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So then C is like amps in a way, it informs you of the rate of flow of the current.

I think I understand now.

So long and thanks for all the fish!
`·.¸¸.·´¯`·.. ><((((º>`·.¸¸.·´¯`·.¸><((((º>

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10-19-2009 09:32 PM  8 years agoPost 13
TJinGuy

rrProfessor

Socorro, NM - USA

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C is used to find all the Amp numbers for a pack. So for charging you would use 1C or 2C to set the charge rate. For selecting components for a new heli you would look at the maximum discharge rate or 20C.

So an example would be a 3s 2200mAh 20C pack for a Trex 450. To charge it at 1C you would

C = 2.2A
1C = 1*2.2A = 2.2A

For 2C charging you would use

C = 2.2A
2C = 2*2.2A = 4.4A

The maximum discharge rate of the pack would be

C = 2.2A
20C = 44A

See how that works? See how the number of cells plays no part? This is all about current (amps).

Could you now figure out all the numbers for a 6s 3000mAh 20C pack?

- Chris

Team New Mexico
TJinTech

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10-19-2009 09:59 PM  8 years agoPost 14
Richardmid1

rrProfessor

Leeds, England

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C ratings have nothing to do with rate of current flow or how fast current will get to your heli. Imagine your motor sucking power out of your battery through a straw, your battery does not push current into your motor. A motor can suck harder on the higher C rated packs without damaging the pack. A higher C rated pack will also hold a slightly higher voltage during use giving better performance.

So the biggest difference to a beginner is the price!

60% of the time, it works every time!

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10-19-2009 10:05 PM  8 years agoPost 15
Dr Lodge

rrElite Veteran

Guildford, Surrey - UK

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A higher C rated pack has a lower internal resistance. That means, for any given current draw, the pack will retain a higher voltage which in turn will give a higher headspeed. I notice this increase in headspeed alot on my Loong Max 30C packs compared to my 20C and 25C Flightpower packs.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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10-19-2009 10:06 PM  8 years agoPost 16
TJinGuy

rrProfessor

Socorro, NM - USA

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C ratings have nothing to do with rate of current flow
Actually it does change the rate of current flow. A higher C rated pack can flow more current at a given voltage than a lower C rated pack. If I use your analogy, the higher the C rating the bigger the straw. Yes this has to do with how hard it is on packs but it also has to do with actual output of the packs.

- Chris

Team New Mexico
TJinTech

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10-20-2009 12:51 AM  8 years agoPost 17
ScottV

rrApprentice

El Dorado Hills, CA

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Thanks for all the information Chris. You have explainer more than I have been able to read and understand.

So long and thanks for all the fish!
`·.¸¸.·´¯`·.. ><((((º>`·.¸¸.·´¯`·.¸><((((º>

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› 20C and 30C what is the difference
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