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AXI 2208/34 on 3cell problem, HELP - 10/30/2004 9:27 PM   
shannah


 

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Status: offline 		I have a AXI 2208/34 running 3 cell Kokam 1020 mah. Jeti Advance 08 3P controller. APC 10x4.7 or APC 9x3.8. Problem is this: After about 2-3 minutes of flying the motor starts pulsating and won't go to full power. Both of my battery packs behave the same way. Switched to a 2 cell and it did the same thing. Is the controller too small??? I ran this on my shockflyer and didn't have this problem (2 cell). Any thoughts????????

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RE: AXI 2208/34 on 3cell problem, HELP - 10/30/2004 10:11 PM   
YS-I-DO


 

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Status: offline 		Get a bigger ESC. The 3 cell will pull more amps than a 2 cell. I ran a Phoenix 25 on my 2208, and had no problems at all with 3 cell.

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RE: AXI 2208/34 on 3cell problem, HELP - 10/30/2004 10:11 PM   
Geistware



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Status: offline 		I have this same setup and will be interested in the responses.

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RE: AXI 2208/34 on 3cell problem, HELP - 10/30/2004 11:13 PM   
thedak



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Status: offline 		A 2208/34 with a Jeti 8P is fine. You don't need a bigger ESC. It doesn't even get warm on a 3 cell pack and a 9 X 3.8 PRop.

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RE: AXI 2208/34 on 3cell problem, HELP - 10/30/2004 11:33 PM   
bob_nj



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Status: offline 		Well then, maybe the real question is what amperage is shannah pulling, and why?

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RE: AXI 2208/34 on 3cell problem, HELP - 10/31/2004 7:26 AM   
thedak



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Status: offline 		To big a prop.

2208/34

9x3.8 on a 3 cell
10x4.7 on a 2 cell

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RE: AXI 2208/34 on 3cell problem, HELP - 10/31/2004 7:33 AM   
shannah


 

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Status: offline 		I ran the 9x3.8 and it did the same thing.

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RE: AXI 2208/34 on 3cell problem, HELP - 10/31/2004 7:59 AM   
b-mccor8



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Status: offline 		I am running a jeti 18, axi 2208/34 with a apc 10 x 4.7 3 cell 10-12c. Flys roughly 15 minutes, no power problems. Cannot get the plane to fly right though. Knife edge and inverted problems?

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RE: AXI 2208/34 on 3cell problem, HELP - 10/31/2004 8:10 AM   
shannah


 

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Status: offline 		Guess my ESC is too small. Darn. It was the setup I ran on my shocky, guess I didn't have to go full bore with that as much as I do with the Raptor.

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RE: AXI 2208/34 on 3cell problem, HELP - 10/31/2004 8:31 AM   
YS-I-DO


 

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Status: offline 		Something I just thought of. I had my ESC programmed for a 9 volt cutoff (3 cells). I tried running a 2 cell pack and the motor would run up, then die, over and over. If the Jeti is programmable, check to see if you voltage cutoff is too high.

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RE: AXI 2208/34 on 3cell problem, HELP - 10/31/2004 9:35 AM   
Airbike


 

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Status: offline 		My 2208/34 w/9x4.7 prop pulls about 12 amps at WOT, on 3cell 1200 Etec pack rated at 10C.
You need to make sure that your battery is up to it. If you have one of the earlier packs, they were not rated for much amp draw.
See if you can borrow someone's TP1320 pack to check your setup.

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RE: AXI 2208/34 on 3cell problem, HELP - 10/31/2004 2:46 PM   
Magnum9


 

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Status: offline 		I have the 2208/34 running the APC 9x3.8 in an 11 ounce AUW EPP plane with the Jeti Advance 08 and have had no problems. That combo will pull almost 9 amps static, but on my setup full throttle goes vertical until you can't see it in under 15 seconds, so you don't pull that many amps all the time. The 10x4.7 is really too big for 3 cells.

I run E-tec 3S-700 7.5C packs and 3S-1200 8.5C packs and they both handle the current no problem. The 700 packs get quite warm, but nothing extreme. The 1200 pack, having lower internal resistance, gives more static RPM and better vertical, but is 30 grams heavier.

Check if the motor is getting warm, mine is still cold after running three packs through it. Check that you have the correct timing setup on the Jeti for the AXI. It is weird that you say you ran the same setup on another plane without any problems. The ESC is not too small, don't go and buy another one, you don't need to. The weight of the plane doesn't matter because the current ratings you see are static. If my setup pulls 9 amps static, then pulling 11 ounces around it probably only sees 7 amps at full throttle most of the time.

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RE: AXI 2208/34 on 3cell problem, HELP - 10/31/2004 3:43 PM   
Geistware



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Status: offline 		I can you tell if a 3 cell setup is too big or not. I have everything I need except the plane and I want to do some tests to make sure that everything is ok. Do you just run the engine at WOT and measure the current?

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RE: AXI 2208/34 on 3cell problem, HELP - 10/31/2004 4:11 PM   
bipeaddict



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Status: offline 		It sounds like your BEC is overheating and causing the motor to cut out. You can't size an ESC on amperage calculations only if you are running the BEC enabled.

There is a direct correlation between the size of the ESC, number of cells in the battery, number of servos and type, and the BEC.

Here is cell count for a CC Phoenix 25 (Can handle 25 Amps). A 3 cell lipo pack is borderline between the 7-8 and 9-10 columns.

Servo Ratings with BEC Enabled

Servo Type 5-6 cells 7-8 cells 9-10 cells
Standard (micro) servos 4 4 3
High Torque (micro) servos 4 3 2

The JETI 18 will support a fewer number of servos.

How many servos are you running? What type? Some servos pull way more amperage than a std GWS pico.

If you setup runs with the motor not cutting out with the servos disconnected then it is your BEC overheating.

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