EP Kaos 60 questions

[Ellis Newkirk]

I am assembling an EP Tower Kaos 60 and would like some experienced opinions on efficient 1400W setups.

 

Rimfire .80 for lower KV and bigger prop?

Prop charts for Rimfire .60 and .80?

Better choice than Rimfire?

Is there good 13.5” prop to use?

6S over 5S (higher voltage = more efficiency)?

Two 3S versus one 6S?

Preferred battery?

3350/4350/5000mAh? (yes, I use lots of throttle management)

Preferred ESC?

 

Feedback appreciated!

Ellis Newkirk

 

[Vic Koenig]

  Ellis, got to cobramotorsusa.com and look at the C-4120/16 610 Kv. Then look at the prop chart icon for prop test results. They are very thorough describing thrust, watts used and amp (to get the right ESC) and also different pack sizes.  My choice for you would be a 5S pack, a Masterairscrew 13/8/3. The ARF is light enough to jerked all over with that motor.

  I'm currently using a 4120/16 610 Kv with 6S pack on a 6.4 pounder and it's just perfect. I use a 12/7/3 MAS and it is more than adequate. I have some Scorpions that are also viable, a 4020/12 (I think) on a 7pound 4 oz plane. I forget the prop ( 3 blade) but if you consider the Scorpion I'll look it up. My phone is 423 282 0572 if you want to talk.  Vic K

 

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[Vic Koenig]

  Just saw this on Scorpion's page, discontinued but a hot dog. Vic

Scorpion S-4020-10

[S-4020-10]

[Jim Johns]

Ellis,

This is the setup Bob Redmon from Wichita Falls is using on the Bootlegger he flies in Expert. It's also what he recommended to me for my first electric SPA plane. I saw him fly the Bootlegger at the West Open last year and it performed well. 

Cobra 4120/18 540Kv, Cobra 80A ESC and a APC 13x8e prop. I believe he's currently running 6S 4500mah LiPos.

http://innov8tivedesigns.com/parts/brushless-motors/cobra-c-4120-18-brushless-motor-kv-540

You might email Bob at k5sm...@gmail.com for more info. Tell him I sent you and he'll only charge you double! :-)

Jim Johns 

[Robert Redmon]

All,

I have found that the best prop for that (4120-610kv-5cell) setup is a 12/10e apc. I have tried the MAS 3 blades and they just don't pull the airplane with the same authority as the apc. The 610kv Cobra 4120 (Have one in my Compensator) is not rated for 1400 watts. Practically speaking, on 5 cells, it is good for about 1200 and compared to the 4130 540kv, just lacks "guts." Also, when I tested the MAS 3 blade props (11/8, 12/8, 13/8), I could also not get the kind of rpm and thrust figures that the Cobra website cites. In my case, they loaded the prop more (higher current) and the 6120 just could not turn the things at the rpm cited in the prop table. On the other hand, the figures cited for the APC props are almost exactly what I see when I measure current and rpm. Test flying the MAS props produced disappointing results as well. By the way, my motors, esc's, and batteries rarely exceed 20 degrees above ambient air temperature at the end of a practice flight. The more heat produced, the more energy is being wasted, so cool is good.

The 4130 (540kv), in my experience, is a much better motor for use in SPA planes/competition than the 4120 (610kv). It does weigh more and, because it is 3/8" longer, it is not as easy to squeeze into the nose of some SPA planes (my new Curare, for instance).  On 6 cells (4500-5000 mah - 35C), using an APC 13/8e, it is easily equivalent of most of the better IC engines in use. In the (low drag) 6.75 lb Curare, it really makes me shuffle my feet, and verticals are essentially unlimited.

FWIW,

Bob

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[Dave Swanson]

I have waded through this thread on RC Groups that covers a wide breadth of various experiences with the Kaos 60 ARF.  It is 72 pages long, but there are many good nuggets of information for E power and IC
https://www.rcgroups.com/forums/showthread.php?2491809-Tower-Kaos-60-ARF
. 

There are many good E combos that will fly this plane well, but it seems the fan favorite so far is the Rimfire 60 with a 100 amp ESC, 6S 5000+ battery, and the APC 13x8E prop.   At max throttle it will exceed the 1400 watt SPA max, but it would be easy to set up a throttle curve that would be SPA friendly. 

[Dave Swanson]

Regarding batteries,  I am using the Gens Ace 6S  45C 5500mah batteries with great success, but if I was to do it over again I might go with Floureon on our favorite auction site.  The Floureons with up to 8000 mah  are being used by a number of flyers and they have been working out great.  You also can beat the price. 

This is a great deal when you consider the price paid for 18600 mah  worth of batteries (3 x 6200 mag)

http://www.ebay.com/itm/3x-FLOUREON-6S-22-2V-30C-6200mAh-LiPo-Battery-EC5-for-RC-Car-Helicopter-Airplane-/302019890811?hash=item4651c9ce7b:g:X9cAAOSwcUBYPuPu

[Dave Swanson]

I might add that since the beginning of this year I have logged  150 flights on my Kaos 60 ARF using the setup below and couldn't be more pleased.