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Other › which has more runtime/pwr?
06-04-2009 11:39 PM  9 years agoPost 1
saitoflyer

rrVeteran

L.A. CA

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I have 10s 30c 4500 batt and 12s 20c 4270. I'm running scorp 500kv 4035

Thanks.

is that a new heli? Oh no honey, its the same one w/different stickers.....

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06-05-2009 12:25 AM  9 years agoPost 2
Ronald Thomas

rrMaster

Gainesville, Fl, USA

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Which heli, ESC, blades, etc?

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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06-05-2009 12:39 AM  9 years agoPost 3
fergus

rrKey Veteran

Ireland

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Logo600?

If so the power factor wont really come into it at least for 3d as that motor can't be geared for a high enough headspeed on 10s.

So taking that into account and just looking at runtime alone for a similar power requirement then the 12s will likely provide the longest flighttime.

Gearing both machines for similar headspeed:
10s 18tooth 1750rpm
12s 15tooth 1750rpm

Taking an average of 1000watts and 3.5volts per cell as a figure then the amp draw and run time is as follows:

10s pack 28.5amps average draw. with a usable capacity of 3600mAh

This gives about 7 and a half minutes.

12s pack 23.8amps average draw. with a usable capacity of 3416mAh

This gives about 8 and a half minutes.

These are only estimates and are based on the fact you can not setup this heli for 3d with that motor and 600mm blades. So I am using 1000watts as an estimate of power for hovering around and very mild aerobatics.

Regards

Fergus

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06-05-2009 12:43 AM  9 years agoPost 4
Terrabit

rrElite Veteran

Seattle, WA - USA

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The 12s should do both.

mAh stands for Milliampere Hour. Ampere-hour is a unit of electric charge. One ampere-hour is equal to 3600 coulombs (ampere-seconds), the electric charge transferred by a steady current of one ampere for one hour.

The output of your electric motor is measured in watts.

Volts x Amps = Watts.

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06-05-2009 01:33 AM  9 years agoPost 5
LJS

rrKey Veteran

Minnesota, USA

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Hi Fergus,

I think you need to check your figures. A Scorpion 4035-500 is fine for 10S 3D. You can run a 14 tooth mod 1.0 for 2169 rpm at 75% governed. I'm flying an X-Era 4030-560 on a 12 tooth mod 1.0 at 2166 rpm at 75% governed and it's an awesome 3D machine.

When I compare batteries, I compare the energy in them by multiplying the number of cells by the capacity of the battery. Thus:

10 X 4500 = 45000 mahcells
12 X 4270 = 51240 mahcells

So the 12S battery has 14% more energy in it. You should get 14% more flight time given the same flight pattern. But I think you'd be better off with the 30C batteries. I've used 20C batteries before (admittedly only 8S) and they tended to run hot.

Hey Fergus, I think your flight times are spot on as I can get exactly 7.5 minutes from my 10S 4500 mah batteries on my Logo 600.

Keep 'em flying.
LJS

Logo 600 VBar, 10S
TRex 600E VBar, 8S
Logo 500 VBar, 6S
TRex 600ESP, 6S

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06-05-2009 01:41 AM  9 years agoPost 6
Terrabit

rrElite Veteran

Seattle, WA - USA

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At 4000watts you'd be pulling roughly 20amps less with the 12s setup. I think that would come pretty close to making up for the difference in the discharge rate. It really depends on whether Saito places more importance on flight time or power. And both will produce enormous power, maybe too much power - if that's possible.

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06-05-2009 09:03 AM  9 years agoPost 7
fergus

rrKey Veteran

Ireland

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I hadn't factored mod1 gears. The difference in flight time will still apply although the actual flight time may differ. The 12s setup on what is a 12s motor should do better. That is providing the 20c 12s pack is in good condition i.e maintains voltage well under load.

Regards

Fergus

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