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Old Nov 26, 2012, 08:21 AM
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thoughts on this?
http://www.hobbyking.com/hobbyking/s...r_1320kv_.html
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Old Nov 26, 2012, 10:38 AM
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Lower max amps, 28. I would prefer something with higher amp cap. Something a little beefier.
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Old Nov 26, 2012, 11:06 AM
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eroeder's Avatar
United States, TX, Frisco
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I'm looking at either:
http://innov8tivedesigns.com/Cobra/C...6-12_Specs.htm

Or

http://innov8tivedesigns.com/Cobra/C...5-10_Specs.htm

Not sure of engine compartment dimensions and max prop size (also what prop gets dangerous for launching)
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Old Nov 26, 2012, 11:50 AM
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Engine is external, and you are good stock with a 9 x 6. No danger in launching at all.
Again, look for something in the 1200kv range for 3s, and 1000 range for 4S.
Copy the successful configs on here instead of trying to find a new motor.
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Old Nov 26, 2012, 06:18 PM
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eroeder's Avatar
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Quote:
Originally Posted by Shadrack View Post
Engine is external, and you are good stock with a 9 x 6. No danger in launching at all.
Again, look for something in the 1200kv range for 3s, and 1000 range for 4S.
Copy the successful configs on here instead of trying to find a new motor.

Isn't picking a motor part of determining a successful config?
Why so high on the Kv? Won't a larger prop turn slower and use less amps? The recommended motor is 830Kv and 12x6. Assuming the pic is the same, the 9x6 you suggest should be well clear of chomping fingers.
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Old Nov 26, 2012, 06:31 PM
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Sure, and if you look around you will see that with 3S, you want about 12-1400kv, for 4S you want less.
12 x 6 won't fit without a lot of mods.
I run the same 1200kv, 9 x 6, and have had level flight with 3 amps.
Can fly an hour with this config.
Larger prop also gives less top speed.
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Old Nov 26, 2012, 06:42 PM
If it's to be, it's up to me.
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Quote:
Originally Posted by eroeder View Post

Isn't picking a motor part of determining a successful config?
Why so high on the Kv? Won't a larger prop turn slower and use less amps? The recommended motor is 830Kv and 12x6. Assuming the pic is the same, the 9x6 you suggest should be well clear of chomping fingers.
I don't think we're all talking about the same Skywalker
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Old Nov 26, 2012, 06:51 PM
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Damn, my bust.
Got side tracked between groups mointored on the Skywalker and Skyhunter. Oops.
Sorry.
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Last edited by eroeder; Nov 26, 2012 at 07:01 PM. Reason: .
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Old Nov 26, 2012, 07:08 PM
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Good luck
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Old Nov 26, 2012, 07:42 PM
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Subsonic.. Love that compass man! I like the 2-wheel main as well.... Little more drag but better than one center wheel I'm sure.
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Old Nov 26, 2012, 10:58 PM
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Quote:
Originally Posted by subsonic View Post
I don't think we're all talking about the same Skywalker
This compass thing is indeed so good. Can I ask you to post more close-ups of the chassis part? What does it look like from the belly side? To my shame I didn't give it much thinking and just used standard long-legged 2-wheel chassis, but your solution looks so much better and smarter.
Also, is there a wheel on the tail end?
I don't have a wheel there, only (shame on me, yes yes) a strap of tin cut out of a beer can, merely to protect the foam from rubbing against the surface of the runway. Weighs less then 2 g.
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Old Nov 26, 2012, 11:10 PM
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Sydney, Australia
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I'll post in the 1680 SW thread. This one is for power systems.
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Old Dec 07, 2012, 11:58 PM
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United States, TX, El Paso
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Anybody using sunnysky motors? Just got my new Condor in. Looking forward to the build.
Link to motor.
http://epbuddy.com/index.php?main_pa...roducts_id=189
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Old Dec 14, 2012, 03:10 PM
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Joined Dec 2012
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Hi Folks,

I am building a 1900 sw and have an Axi 2808/24 gold line motor kicking around.

It says 2 or 3s lipo cells on the blurb, if I run it on 4s, will it burn?!! (a 9x6 pusher prop)

Will it work on the SW anyway?

Thanks!
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Old Dec 31, 2012, 04:38 PM
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United States, TX, College Station
Joined Nov 2010
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  • Weight: around 73 oz.
  • Motor: 920 kv Emax BL2820/07 from HURC (http://www.headsuprc.com/servlet/the...ushless/Detail)
  • Prop size: 9x6, 10x5, 10x6, 10x7
  • ESC: Hobbywing Platinum 40A
  • Separate BEC: Castle 10A
  • Servos used: HS-82MG x4 on wings (noisy little buggers); HS-65HB x2 on tail
  • Flight battery: 1 Sky Lipo 4S 4000 mAh
  • Video battery: small 3S
  • Flight cam: RMRC 480
  • VTX: 400 mW Sunsky
  • VTX antena: DIY Cloverleaf
  • RX: Sunsky or Lawmate
  • RX antenna: DIY Virevent or Skew-planar wheel
  • Stabilizer: GWS PG-02 dual-gain, switchable via Tx
  • OSD: Remzibi OSD
  • Max wind: about 25 knots
  • Mods: flaps, motor mount, carbon ribbons in wings/stabilizers, proper hinges and control hardware.

Some prop data for my motor. Admittedly, it's not very helpful since I don't have a tachometer and therefore, have no way of measuring thrust.

9x6:
Max current: 28.55 A @ 16.02 V
Max power: 457.3 W
Min voltage: 15.73 V

10x5:
Max current: 31.21 A @ 16.01 V
Max power: 499.7 W
Min voltage: 15.72 V


10x6:
Max current: 35.03 A @ 15.83 V
Max power: 554.6 W
Min voltage: 15.51 V

10x7:
Max current: 37.74 A @ 16.03 V
Max power: 604.8 W
Min voltage: 15.40 V
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Last edited by TexasAggie; Jan 06, 2013 at 08:35 PM.
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