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Old Nov 28, 2012, 10:05 AM
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What battery do I need for my AXN Floater

Hey guys...I've decided to get the AXN floater over the bixler for now so i can crash something cheap before building up a bixler with some really nice components. That being said I'm looking for batteries for the AXN Floater. Im looking in the 1800-2200mAh range, but am unsure what "C" I need? I'm not exactly sure what C is compared to when dealing with amps/watts of the motor. The motors specs are this AXN-2208 w/ 2150kv. Max output is 180w and 20amps. The ESC is rated for 20amps. Something to keep in mind, I will be planning on putting a bigger motor in the bixler when I get it and want to be able to use the batteries for both applications while still gaining optimal performance for the bigger motor. The bigger motor will be in the range of a 2826-10 with 1400kv. That requires around a 25-30amp ESC. Let me know what you think?
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Old Nov 28, 2012, 12:06 PM
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Orleans, MA
Joined Feb 2007
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A 2200mAh (3S?) battery looks like the right size for your current and future plans. A 10C draw from this battery (2.2 amps x 10) or about 22 amps should be easily accommodated by almost all batteries rated 20C and up.

Here's a DriveCalc run for the AX-2208N on 3S turning a 6x4 APC E.
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Last edited by whitecrest; Nov 28, 2012 at 12:24 PM. Reason: Additional info.
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Old Nov 28, 2012, 01:44 PM
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United States, TX
Joined Jun 2011
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The AXN Floater will not fly nice like the Bixler. It's more of a handful.
It's very fast, has a very powerful motor, and has a tendancy to dive. Mine had a bad warp in the wing, and I had to hold right aileron to get it to fly straight, but I could never take my hands off the controls.

I know some people really like the AXN Floater. But I didn't care for it at all.
That being said, I used an 11.1V 1150 mah lipo for mine, if I remember right. I think I also needed a little lead in the nose to balance out still. Not a whole lot of room is provided for equipment though! It's really tight inside.

Personally, I don't think the Bixler will crash for you, but I think the AXN probably might. It flies, it's just more of a challenge to fly than the Bixler would be. Just fair warning.
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Old Nov 28, 2012, 04:28 PM
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United States, CA, Oceanside
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I use a 2200 mah 50c battery in mine and am getting about 12-15 minutes of flying time depending on how much I use full throttle. Builderdude is right, it is a handful for the newbie as it does have some strange characteristics, like wanting to dive at full throttle. It is very fast too.
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Old Nov 28, 2012, 04:41 PM
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United States, FL
Joined Feb 2012
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Add a mix for the elevator to go up when increasing throttle to solve the diving problem.
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Old Nov 28, 2012, 05:40 PM
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Quote:
Originally Posted by kov16 View Post
Add a mix for the elevator to go up when increasing throttle to solve the diving problem.
Or buy a different airplane to solve the diving problem...
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Old Nov 28, 2012, 09:21 PM
Noob making progress
Australia, NSW, Mt Colah
Joined Oct 2012
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Just maidened mine.

3S 2200 Turnigy, which gives a SLIGHTLY nose heavy COG, positioned back to just clear the servos. You will need to trim some foam to fit the lipo, tho' Flew some 5-6 min, half throttle, put back 250mAh on charge.

Can't say I found it difficult to fly, and I'm upgrading from a Champ, so no 4-channel experience. Maybe yours was damaged?

Alastair
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Old Nov 29, 2012, 08:30 AM
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Not damaged. Just real spotty quality. Mine came from China. When I ordered it, it took awhile to come in and was shipped to me. My theory is that it got excessively hot in the shipping container because it flew like it had a warp in the wing. That didn't explain the tendency to dive under full throttle though. That right there is just bad quality design.

Enjoy your plane.
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Old Nov 29, 2012, 11:38 AM
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United States, CA, Oceanside
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Yep, have added up elevator when flying full throttle. At half throttle she flies straight and true hands off.
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Old Nov 29, 2012, 11:38 AM
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Alistar, what C rating did you have on the 2200mAh
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Old Nov 29, 2012, 09:36 PM
Noob making progress
Australia, NSW, Mt Colah
Joined Oct 2012
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I've got 2 of these

http://www.hobbyking.com/hobbyking/s...dProduct=14642

If the weather holds tomorrow I'll be flying, so will give more info on duration.

Alastair
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Old Dec 01, 2012, 08:13 AM
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Australia, NSW, Mt Colah
Joined Oct 2012
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Some more data

Flights of 8'; 13'30"; 12'30". Flying circuits on mixed throtle.

Put in ~ 400mAh; 1100; 1000

Looks like will run something near 20' without taking it too low.

Alastair
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Old Dec 01, 2012, 11:11 AM
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above whitecrest was saying that the C rating is equivent to 2.2amps of motor power. Can anyone verify that? I just notice that that would only make a need for 10C output for a 20amp motor, then why do I see people running 20c-50c for the same application?
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Old Dec 01, 2012, 12:35 PM
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Orleans, MA
Joined Feb 2007
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Yes, for a 2200mAh battery, 1C is 2.2 amps, 10C is 22 amps. The motor/prop only draws needed current. Batteries with higher C ratings can provide more burst current, if demanded, and will generally provide a higher loaded voltage.

Sizing the battery for a 10C draw in the power system allows the use of relatively inexpensive 20C batteries with plenty of reserve power and about 6 minutes of full-throttle power. Higher-C batteries will provide higher loaded voltages and more instantaneous power.
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Old Dec 01, 2012, 08:12 PM
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so does the amps per C depend on how many mAh the battery has. Im running 3s, so if I have this right, then if I got an 1800mAh 3s battery then a 10C battery would only be good for up to 18amps?
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