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Old 06-30-2011, 05:48 PM   #1 (permalink)
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Default Battery size

Hi,

I fly a stretched FBL Mini Protos with a 3S2200 batteries, but, since it's tail heavy, I'm thinking of going to a bigger battery. What would be the largest size that I can use on
my Mini? I have a KYPOM 3S KT2600, which is 15mmx45mmx133mm and weighs
210g.

My current setup is
Motor: stock
Pinion:15T
ESC: CC Phoenix ICE50 Lite
Mains: 350mm
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Old 06-30-2011, 06:54 PM   #2 (permalink)
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I am flying my stretched Mini Protos with ProTek 3S 3300 packs which fit OK under the standard canopy.
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Old 06-30-2011, 08:04 PM   #3 (permalink)
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One of these ought to weigh the nose down pretty well:

3s 3800mAh
http://www.xheli.com/98p-25c-3800-3s1p.html
Size: 135.67 * 42.83 * 26.16mm (L * W * H)
Weight: 322.35g

I saw them this week and was curious as to how they would do.
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Old 06-30-2011, 08:26 PM   #4 (permalink)
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Hi, Rablett

Thanx for a quick response. According to info on the Web, the one you mentioned is 45mmx133mmx24mm in size and weighs 300g

I test fitted two Hyperion 3S1600's and found the two in parallel are very good CG-wise,
and they are nearly that weight.

So, I think ProTek would be a perfect choice, though I'm not sure if the shops in Japan
carry those.

Akira
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Old 06-30-2011, 08:28 PM   #5 (permalink)
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Hi, Exit44rc

3800mAH? That is huge for a Mini, isn't it? And a bit too heavy, maybe?

Thanks anyways. I appreciate your input.

Akira
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Old 07-01-2011, 10:09 AM   #6 (permalink)
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Why not go 4s2200, I am thinking of going this way with the stock motor an 14 tooth pinion on the stretch when I get one, but might swap to the new 2000Kv motor if the head speed is too high.

//Dennis.
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Old 07-01-2011, 10:15 AM   #7 (permalink)
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Hi,Thunder Fighter,

Yes, I'm afraid that the headspeed would be too high with a 4S battery even if I use 14T pinion. If the stock motor is replaced with another one with the lower KV, that will not be a problem, though.

The new 2000Kv motor? I'm interested to know more about that new motor.
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Old 07-01-2011, 05:03 PM   #8 (permalink)
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Another fairly popular capacity for 3s is 2600mAh. Those might be around a 250g weight which would give you a little more than a 3s 2200mAh.

EDIT: I read your original post again after I wrote this. Maybe something in the 3300mAh range would work.
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Old 07-01-2011, 09:18 PM   #9 (permalink)
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Before actually stretching the tail on my Mini P, I thought that a 3S2600 battery would be enough to make it balance out. However, it turned out that only 20 - 30g increase would not be of much improvement CG-wise.

Meanwhile, MicroBeast is doing a good job and gives me a good hover even with 3S2200, so I'm not really pressed to buy larger batteries at this moment.

When I do batteries with larger capacity, I will report back.
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Old 07-01-2011, 11:45 PM   #10 (permalink)
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How badly is the stretch out of balance with 3s 2200?

I have one on the bench now and was intending to re-use my 3s 2200 packs (190g) from my Pro, but if it will be impossible to balance should I just stick to the 325 setup?

Also, when those packs die I was thinking of replacing them with 6s, and I can only find the Voltz 1300 6s, and that's only 210g, and even that doesn't seem like it would be enough.

Cheers,
Ant
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Old 07-02-2011, 12:39 AM   #11 (permalink)
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AusAnt,

I'd say it's quite bad -- so much so that I'd probably have to lengthen the battery tray more than 7 or 8cm.

I'm not sure how you can balance your Mini Protos using a 6S pack, but probably you'd
be using a different motor and the weight of the replacement motor would hopefully help.
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Old 07-02-2011, 01:16 AM   #12 (permalink)
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Thanks. I might set it up as 325 to start then.

I'm not sure but I'm guessing the upcoming MSH 1300Kv motor for 6s setups would probably be based on the same motor as stock, but a different wind. So weight is probably not much different.

Another option would be a 4s pack with the upcoming 2000Kv or so motor, at least there would be more packs to choose from.

Cheers,
Ant
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Old 07-04-2011, 09:06 PM   #13 (permalink)
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Quote:
Originally Posted by akiyoshinosato View Post
Hi,Thunder Fighter,

Yes, I'm afraid that the headspeed would be too high with a 4S battery even if I use 14T pinion. If the stock motor is replaced with another one with the lower KV, that will not be a problem, though.

The new 2000Kv motor? I'm interested to know more about that new motor.
well, i'm thinking of running a 4s batt using the stock shown in the video. can I use a 40 C batt or should I use a 25C batt ?
the only thing i'm wondering is, how much can the stock motor take with a 4s batt in the long run...

[ame]http://www.youtube.com/watch?v=N6OMr92mFtw[/ame]

Last edited by hakiem; 07-04-2011 at 11:32 PM..
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Old 07-05-2011, 04:26 AM   #14 (permalink)
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The one in the video is Protos 500 not Mini Protos.....

On Mini Protos using 3S after 3 minutes of moderate 3D flight you have a very hot motor (stock) and I don't think you can go up to 4S without changing it...

My 2 cent opinion.
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Old 07-05-2011, 12:41 PM   #15 (permalink)
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Quote:
Originally Posted by rino2 View Post
The one in the video is Protos 500 not Mini Protos.....

On Mini Protos using 3S after 3 minutes of moderate 3D flight you have a very hot motor (stock) and I don't think you can go up to 4S without changing it...

My 2 cent opinion.
Rino
Its a mini, just a prototype before the final version was released I believe.
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