Having just received my replacement Axi 2212/34 Gold from Hobby-Lobby (thanks, guys) I thought it might be amusing to compare performance data from this new one (listed as 710Kv) with those from the original (listed at 740Kv).

The test set up was pretty much the same in each case, except that the original was tested on the MkII Tractor stand and the new one was on the Mk III Pusher stand - thus the thrust numbers, in relation to rpm, might be slightly higher for the new motor.

The odd thing is that the new model (710Kv) draws a little more than the old one (740Kv)???

Cheers, Phil

Why are the volts higher on the new motor than the old motor? Are you using a different power supply?

Originally Posted by 10Thumbs

Why are the volts higher on the new motor than the old motor? Are you using a different power supply?

Same power supply, but a bad contact early on was making voltage drop more at higher voltages/current than it does now.

I fully understand that this comparison as presented here is somewhat flawed - but still, I have some other figures where even at the same volts-in the new one is drawing a little more.

The odd 1/10th of a volt doesn't explain the rather larger increase in current draw.

Hi

First of all many thanks for sharing all your tests, it´s very useful info


Have you compared any axi silver vs gold line?



Andres

Originally Posted by AndrésMtnez

Hi

First of all many thanks for sharing all your tests, it´s very useful info


Have you compared any axi silver vs gold line?



Andres

No, I haven't ever tested any of the Silver line. The Gold are so good, that I don't want to compromise just to save a a few dollars.

I think the price difference (30%) worth the "risk". I have a 2212/20silver with a formosa and I´m very happy with it. Just curious about the real difference with the gold line.


Andres

I have one in and AUW 15.5 Oz model, and the vertical is fast , But its never used that way , just a squirt to get me out of trouble sometimes , when I get out of shape , with a 9 by 4 APC on,,,, acceleration is instant and I feel that full throttle turns around the sky would snap the model , its lightly built , no way would a gold make any difference to this model except in price and its been running for months,, 180 Watts of real power

Originally Posted by Geoff Woodward

no way would a gold make any difference to this model except in price and its been running for months,, 180 Watts of real power

Hobby Lobby states the silvers are ~2% less efficient.. So its like flying a 1294mAh pack vs a 1320mAh pack .

My guess is there is a larger difference in real life... It would be interesting to find out.

It would be interesting to find out the difference
But it means nothing to me in terms of flight enjoyment on my setup
180watts is nothing
in glow terms but in electric, its the ultimate weapon

Originally Posted by Geoff Woodward

I have one in and AUW 15.5 Oz model, and the vertical is fast , But its never used that way , just a squirt to get me out of trouble sometimes , when I get out of shape , with a 9 by 4 APC on,,,, acceleration is instant and I feel that full throttle turns around the sky would snap the model , its lightly built , no way would a gold make any difference to this model except in price and its been running for months,, 180 Watts of real power

Good thing you don't use WOT too much - 180W sounds to me a bit over the top for a 2212/20 doesn't it? I guess these Axi's are pretty rugged and perhaps conservatively rated!

My calcs are 12.6V by 16 A are over 200 watts , Its a 16 A for minute allowable motor , thats real big power in 15.5 Oz AUW and I dont know if its pulling 16 on a 9 by 4 APC , I reckon that I could pull a 9.5 by 4 ( more amps for a short period ) and have even more massive performance
But to be sure its not a WOT setup
It would be crazy to do that,
Im burning a CS 1650MaH , 10C 3S , so thats right for 16A constant and about 24A burst if I remember right
Wide open throttle in the far sky is a far different setup to short sharp 3D and the 2 setups dont seem to mix,,,,,, I made sure I understood the setup before I converted to electric,, it really pays

Should be 15A for 60 Sec
Which could be 20A for 5 Secs

Thats still a lot of herbs for a small motor

I just tried Motocalc with the Silver Axi 2212/20 on 3s and a 9x4.5 APC E (I assume that's what you have) - I can't see 180-200W anywhere - just over 12A and 125W is what it predicts.

I don't quite understand your 12.6v and 16A - {unless you are using 4s} there is no way you can get 12.6v out of a 3s pack - a 1650 10C pack might deliver 10.5v under 16A load but not much more.

Just goes to show how much
I know about Electric
Zip
Im glad Im talking to you guys
I see ,,, under load you mean you have a lot less voltage to play with ,MMMMM, and your saying I can run a lot more prop but my bat may be not up to delivering 16 amps ,,, oh no Luck the plane even works ,, but as I said the performance is good
I was under the impression that a 1650 battery,, 10C,, could deliver 16 A Constant

10.5 times 16 is 168 Watts

And my motor is only pulling about 12 A really, with a 9/4 APC E
Thanks heaps

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