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HomeAircraftHelicopterHelicopter Main Discussion › why run 12s over 10s
10-22-2013 07:05 PM  4 years agoPost 1
waheed1998

rrApprentice

baltimore,md

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Are they any benefits in run your heli on 12s over 10s,now i know this is one of the same that has been talk about,and a beginner like myself just getting to this point,but i just wanted to know.The reason the science don't add up to me reason you'll do.I 4 one don't see any benefit ,do you get more flight time, is the heli more heavier vs lighter not more stress on the battery's or is 12s geometry better suited for battery life,not to share stick pack or split pack with 700 heli .Does the heli get more power.Or 10s battery hard to get 2 5s battery or don't like sick packs

anthony jackson

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10-22-2013 07:19 PM  4 years agoPost 2
JKos

rrProfessor

Redondo Beach, CA

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If you have 10S and 12S battery packs with the same amount of total energy and the same weight, then, in a perfect world, they would both fly the same heli with the same power and same flight time.

However, we don't live in a perfect world and, thus, there are losses throughout the electrical system of a heli. Given the same shaft power output and the same motor efficiencies, a 12S system will draw 16.7% less current then a 10S system. That means 30.6% less I²R losses in the 12S system.

However, it is possible for a motor used in a 12S system to be less efficient then a motor used in a 10S system and, thus, cancel out some or all gains from the reduced I²R losses.

- John

RR rules!

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10-22-2013 07:20 PM  4 years agoPost 3
niyot

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Baltimore, Maryland

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More power!! Just like 14s has more punch than 12s. It also depends on what you are flying. 12s can be overkill for some applications. I like the being able to use double up a 6s pack to make a 12s or just use the 6s by itself.

Hood HeLi : RIP Roman

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10-22-2013 07:48 PM  4 years agoPost 4
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

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"power" is defined by Voltage*AMPs. So, it's a bit erroneous to say 12s is more powerful than 10s. While it is possible to GET more power from 12s, the real benefit is in the efficiencies in delivery. For example:

a 12s setup (aka 44.4v) delivering 80 amps = 3552 Watts
has the exact same 'power' as a
10s setup (aka 37v) delivering 96 amps

If anyone remembers the first trex 600, it was a 6s setup.

6s (aka 22.2v) * 100amps = 2220 watts of 'power'

back in those days 20C-25C lipos were the norm. So, you can imagine running a 5000mah 20C pack at 100amps for 4 minutes, the thing was cooking. I regularly measured 115°F after flights. $300 packs dying after 10-20 cycles got old REALLY quick.

So, i converted to 3300mah 20C 12s.
power remained 2220 watts, but rather than redlining my packs at 20C, I'm only pulling 50amps continuous out of the packs or 75% of their C rating. The result was packs (and ESC and motor) that came down MUCH cooler, and packs that lasted 75-80 cycles rather than 20.

so, people ask me why I run a 10s setup on my Logo 600 when 12s is "more powerful". And, I say "well, my gov is set for 2200RPM, and my tach tells me it never deviates more than 50RPM even through the hardest moves I can throw at it. My amp draw is 33% of my packs' C rating. And, packs measure a cool 5°F above ambient after I fly. The only benefit of 12s I see is a slight weight savings, which would only require me to add ballast to my tail to re-CG the airframe. I don't see a benefit to running 12s."

if it ain't broke, break it.

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10-22-2013 07:52 PM  4 years agoPost 5
niyot

rrApprentice

Baltimore, Maryland

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Yeah.. Like cuda said..
I thought I basically said the same thing

Hood HeLi : RIP Roman

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10-22-2013 07:58 PM  4 years agoPost 6
qraptor

rrApprentice

Illinois

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As JKos said, it really boils down to efficiency. The higher power demands from a 700 size heli would have unacceptable power losses at high head speeds if run at 6S rather than 12S. The difference is smaller between 10S and 12S, but it is there, esp since the losses go up as the square of the current.

This is why all the high power trans lines all run at very high voltages.

And Cuda posted an excellent explanation as I was typing

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10-22-2013 08:43 PM  4 years agoPost 7
Scott1115

rrElite Veteran

Greenwich, CT

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I used to run my Furion on 10S (2* 4000mAh, 30C) then I changed over to 12S (2* 3300mAh, 35C). I did change the pinion for proper gearing, but I can say it feels more powerful; the biggest plus though is the motor, batteries, and ESC come down much cooler (measured with infrared thermometer). Flight times are the same.

Compass 7HV, Trex 550E
RCRCC

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10-22-2013 10:07 PM  4 years agoPost 8
devin120

rrVeteran

Canada

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gee
Gee I don't know, maybe 2 extra cells? So you have 8.4 more volts. tabarnak...

Miniature Aircraft - OS power - Futaba electronics

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10-22-2013 10:40 PM  4 years agoPost 9
AirWolfRC

rrProfessor

42½ N, 83½ W

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The difference between a 10S and a 12S is trivial. Other factors will decide what works better for a complete set of circumstances.

For a given power level and wiring set, the higher voltage will waste less energy in the wires.

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10-22-2013 11:44 PM  4 years agoPost 10
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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Aside from 12S being more efficient than 10s.
I believe the popularity of 6S packs to be the culprit to making 12S more favoured over 10S as well.
Not many people use 5S packs and they are harder to locate.

spending time, paying attention

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10-22-2013 11:52 PM  4 years agoPost 11
Ace Dude

rrProfessor

USA

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2m pattern planes are limited to 10s in competition and there are a lot more pattern pilots than heli pilots so I'd bet 5s packs outsell 6s packs.

  

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10-22-2013 11:58 PM  4 years agoPost 12
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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That's quite possible I don't know of any airplane shops. All the shops I know of or use, sell only heli's.

spending time, paying attention

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10-23-2013 12:41 AM  4 years agoPost 13
Ace Dude

rrProfessor

USA

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The only reason I know this is because there are several pattern pilots in my club. Some of them compete at the Master's level and they all fly 2x5s packs. Other than that I don't have a clue about pattern planes.

  

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