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Mar 02, 2003, 03:50 PM
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soholingo's Avatar

Bandit on an AXI 2820/10


Well a lot of people have asked about this set up. Here are some inflight details.

I flew this setup today:

AXI 2820/10
8 H/R AUP 1700 nimh
Gruapner 14x9.5 prop (yes this is larger than spec, but other than a little heat, this setup rocks)

A few observations.

1. This set up is lighter than a hacker, gearbox, and cp1700 cells, a very popular setup.

2. This set up does VERITICAL!!!! I was using 3000 nimh before, and they were too heavy, with the lighter cells and bigger prop, performance is great.

3. It is quiet. Which I like because it doesn't attrack a lot of attention.

4. Relatively speaking, this is probably the greates bang for the buck setup going. (you could save some money and go with cp 1300 cells, but you would loose duration).

5. Because I was flying in a wet field I taped up the holes after the 2nd flight. Motor and battery became warmer, but seemed to perform better. With the holes exposed pack, motor, and esc were cool to the touch.

Let me say this, unless you are looking for mind numbing climbs, this setup is great. You can get to 500 feet in about 15-20 seconds, and you have decent power to climb. I never once experienced torque steer with this setup. Lastly, my bandit was heavy due to all the repairs so a fresh bandit should perform nicely.

j
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Mar 02, 2003, 09:49 PM
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icewindblue's Avatar
I notice that you're using a NiMh pack - how does it perform compared to a Ni-Cd pack? Is the internal resistance low enough to allow the 40-50-60 amps you must be drawing on that 14x9.5 prop? How does the pack weight compare to that of a cp-1700 pack?

Thanks to some help from you and some other ezoners, I've ordered an Axi for my Omega 2mE, and would love to save some weight with a NiMh pack IF and only IF it'll be up to the task! I've seen these packs advertised, but heard nothing about them.

Thanks,

Chris
Mar 02, 2003, 11:35 PM
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soholingo's Avatar
I am estimating I am pulling around 40 amps with the bigger prop. The cells take it no sweat. And since the max efficency of the motor is at 35 amps, you don't need to pull much more than 40 amps.

The h/r aup cells weigh about the same as cp1300 but hold a real 1700-1900 mah, where as the cp1300 only hold about 1100 or so.

really this is the best bang for the buck setup I have seen. And the lighter weight has helped the flying immensly.

j
Mar 03, 2003, 07:46 AM
Registered User
Fredrik W's Avatar
I have done some testing with the AXI motors and a 14 x 8 Aeronaut folding prop pulls 39 A on 7 RC2400 cells. Your set up exceeds the motors spec alot!

I have pulished my tests on my site:

The Great Electric Motor Test

// Fredrik Wergeland
Sweden
www.flyingmodels.org
Mar 03, 2003, 07:55 AM
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soholingo's Avatar
Quote:
Originally posted by Fredrik W
I have done some testing with the AXI motors and a 14 x 8 Aeronaut folding prop pulls 39 A on 7 RC2400 cells. Your set up exceeds the motors spec alot![/URL]
Fredrick you are exactly right!!! After seeing others push their setups (hacker 8s rated at 40 amps running at over 60 amps) I decided what the heck. Besides your tests are static. As soon as let go of the plane I am sure the amps drop back down into the optimum 35 amp range...

j
Mar 03, 2003, 11:17 AM
Registered User
Quote:
Originally posted by Fredrik W
I have done some testing with the AXI motors and a 14 x 8 Aeronaut folding prop pulls 39 A on 7 RC2400 cells. Your set up exceeds the motors spec alot!
The spec says 40 amps for 60 sec.
And if you run this Bandit for 60 seconds, you've got other problems than hot motor (disappeared plane!)

/Stefan
Mar 03, 2003, 12:13 PM
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soholingo's Avatar
Quote:
Originally posted by Janzzon
The spec says 40 amps for 60 sec.
And if you run this Bandit for 60 seconds, you've got other problems than hot motor (disappeared plane!)

/Stefan
Janzzon,

GOOD POINT. I am only running the motor for about 30 seconds at a time. It's nice to see that the motor is going to survivr...



j
Mar 03, 2003, 12:16 PM
Registered User
MikeC's Avatar
For most of the last years flying season I used a 16X10 prop on my seven cell (CP1300s) Axi powered sailplane and static amps was less than 42. I fly at 6200 ft asl. One other guy in our club has suggested to prop the Axi up intil it burns out to find its upper limit, but I like this motor too much to do that and besides the effeciency is not that of Hacker motors so it seems worthless to go much beyond 40 amps.

Mike
Mar 03, 2003, 12:47 PM
Tacoma, WA, USA
William A's Avatar
My Bandit;

AXI 2820/10
12X6 CAM
10-1700CP
approx 40 amps
10 second runs (vertical till ya can't see it)

Does your Bandit make a 'howling' kinda noise during high speed snap rolls ?
Last edited by William A; Mar 09, 2003 at 03:12 PM.
Mar 03, 2003, 01:03 PM
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soholingo's Avatar
Quote:
Originally posted by William A
My Bandit;

Does your Bandit make a 'howling' kinda noise during high speed snap rolls ?
My bandit doesn't snap roll, it just snaps...

Good to see other people using this motor in the bandit. It's a gem...

j
Mar 03, 2003, 03:11 PM
Registered User
Fredrik W's Avatar
Quote:
Originally posted by soholingo
Good to see other people using this motor in the bandit. It's a gem...
Sad I didnīt know this two weeks ago. I have just received a Fun 400-42 + 4,2:1 gearb. But I already had an AXI 2820/10...

// Fredrik Wergeland
Sweden
www.flyingmodels.org
The Great Electric Motor Test
Mar 03, 2003, 04:13 PM
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soholingo's Avatar
Quote:
Originally posted by Fredrik W
Sad I didnīt know this two weeks ago. I have just received a Fun 400-42 + 4,2:1 gearb. But I already had an AXI 2820/10...

// Fredrik Wergeland
Sweden
[/URL]
I think you would have wanted something more powerful than a fun 400. So with your motor tests, you didn't measure the amount of thrust that the axi was putting out on 7 cells? Even on 7 cells and a 14x8 prop the climb should be prodigous...

j
Mar 03, 2003, 05:14 PM
Registered User
krakatoa's Avatar
Soho,
Thanks for all the info on your AXi setup as I am looking to up the ante with my bandit.

William....mine makes a wonderful howling whistle on a high speed high rate roll......I love it ... power dive silent level off for a low pass and then a sudden roll in front of the pit area makes every one of the gas guys go what was that!!
Now to go Faster for a double roll
Mark
Mar 04, 2003, 12:07 AM
Registered User
Fredrik W's Avatar
Quote:
Originally posted by soholingo
you didn't measure the amount of thrust that the axi was putting out on 7 cells? Even on 7 cells and a 14x8 prop the climb should be prodigous...
Yes I did, but I thought that the Fun 400 + gearb gaved much more power than the AXI.

// Fredrik Wergeland
Sweden
www.flyingmodels.org
The Great Electric Motor Test
Mar 04, 2003, 02:28 AM
Registered User
WimH's Avatar
Quote:
Originally posted by Fredrik W
I have done some testing with the AXI motors and a 14 x 8 Aeronaut folding prop pulls 39 A on 7 RC2400 cells. Your set up exceeds the motors spec alot!
www.flyingmodels.org
An Aeronaut 14*8 prop pulls quite a bit more current than a Graupner 14*9.5...

@ Soholingo : Hav you tried the Aeronaut 13*11? It should use slightly less current and work even better...