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Sidwinder SCT Max Current Draw
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coreyfro
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Sidwinder SCT Max Current Draw - 02.18.2011, 12:37 PM

I am aiming to get the smallest, lightest battery I can get for my SCRT10. I am stripping every fraction of a gram I can. If I can get my battery down to something that will last me just a heat, I will. The real limit is what I can expect the 3800KV motor to demand.

Can you give me a ball park figure on the draw? I'll consider all "punch control" like options. If I do my job right, I can sacrifice punch if my ride gets light enough.
   
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BrianG
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02.18.2011, 01:13 PM

Do you have that setup right now (minus battery) and an Eagletree? If so, you could run whatever battery you have to get a ballpark figure.
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bruce750i
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Talking 02.18.2011, 01:14 PM

At 2s voltage, I would guess somewhere between 1400-1800mah/5min. I use to make a 5 min races with my hyper-10 1512 2650kv on 2s 3000mah nano packs. Lipo was a little bit too warm and soft (for a nano)after a hard 5min race. Some loss of punch was noticed at the end of the race.
I have heard a sponsored driver say "you can't use the punch of a high c rated lipo on dirt"(in a 2wd). I don't 100% agree with that because you can get away with a smaller lighter pack of a higher c rating with the same overall "punch" feeling.

Last edited by bruce750i; 02.18.2011 at 04:05 PM.
   
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coreyfro
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02.22.2011, 02:50 PM

Quote:
Originally Posted by BrianG View Post
Do you have that setup right now (minus battery) and an Eagletree? If so, you could run whatever battery you have to get a ballpark figure.
I wish I had an Eagletree. I was just hoping for a ball park.

The battery I am currently looking at is:
http://www3.towerhobbies.com/cgi-bin...?&I=LXYKT4&P=7
7.4V 4200mAh 30C (Max Burst Rate: 60C/252A)

I think that's more than enough. Before I was looking at a 3300mah stick-pack, but this one is only 30 grams more, and it will allow me to lay my pack flat. Getting a lower CG was part of the desired effect and that 30 grams lower might be better than the alternative.

Last edited by coreyfro; 02.22.2011 at 02:52 PM.
   
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crusey_aus
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02.23.2011, 01:33 AM

I have seen figures of 850 watts quoted for the motor running 2s

That would mean a burst of 115 amps or so at 7.4v

Cheers
   
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scarletboa
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02.23.2011, 02:52 AM

Quote:
Originally Posted by coreyfro View Post
I wish I had an Eagletree. I was just hoping for a ball park.

The battery I am currently looking at is:
http://www3.towerhobbies.com/cgi-bin...?&I=LXYKT4&P=7
7.4V 4200mAh 30C (Max Burst Rate: 60C/252A)

I think that's more than enough. Before I was looking at a 3300mah stick-pack, but this one is only 30 grams more, and it will allow me to lay my pack flat. Getting a lower CG was part of the desired effect and that 30 grams lower might be better than the alternative.

that battery should run just fine on your setup.


They say a good mechanic only needs 2 tools - WD40 & Duct tape. If it moves, and its not supposed to, duct tape. If it doesn't move, and its supposed to, WD40.
   
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outlaw
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02.23.2011, 07:22 AM

Quote:
Originally Posted by crusey_aus View Post
I have seen figures of 850 watts quoted for the motor running 2s

That would mean a burst of 115 amps or so at 7.4v

Cheers
Thats about right

See pdf attached
Attached Files
File Type: pdf SCT_EagleTree_2S.pdf (578.3 KB, 331 views)


kind regards

Mirko

Brushless motors have to be green ....
   
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