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Old Oct 27, 2011, 10:49 AM
RTFM
octane81's Avatar
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Cool , anyone know if this kind of info is available for the BEVRC recommended SW motor also?
Thanks thekubiaks , very helpfull info !!!
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Old Nov 02, 2011, 12:27 PM
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Some cruise numbers for you.

I am flying the Skywalker V5 with the Turnigy 3542/1000 6 pole (APC 9x4), 5000 4S and a 1750 3S. If you look at my posts above, the max amps for this motor with a 9x4 is ~20.7amps, this is plenty of power for me. I can easily climb with 2/3 power at 700 - 800fpm. Probably climb at > 1500fpm at max power. Flying weight is 5 lbs exactly with a GoPro on the nose.

Comfortable cruise with the GoPro is 8.3 amps and ~ 22mph. Without the GoPro, it takes about 6.8 amps. I have my CG right on the servo wire channel when I fly with the GoPro. This makes the airplane "feel" a little aft CG but I think the flat face of the GoPro on the nose is messing up the aerodynamics somewhat and making it pitch sensitive.

If I take the GoPro off and put the foam canopy on, the airplane flies much better with the CG a little behind the servo wire channel. YMMV.
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Last edited by thekubiaks; Nov 02, 2011 at 12:39 PM.
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Old Nov 05, 2011, 12:50 PM
O <- this a ground loop
Japan
Joined Nov 2010
514 Posts
Quote:
Originally Posted by thekubiaks View Post
I was going to test the 9x4 but only had one left. I took that prop flying this morning on the Skywalker with the 3536/1450. The 3536/1450 has a 5mm shaft but the 3542/1000kv has an 8mm shaft and I have to ream it out (one way mission) I'll go get a new 9x4 in a minute and let you know how it comes out. Cheers
Are you sure about the 8mm shaft on the 3542/1000kv?
The spec on HK says 5mm and nobody has complained as of yet

Anyone tried any tri-blades?
There is this page I found way back
http://fpvpilot.com/LongRangeFPVPlane.aspx

cheers,

Ren
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Old Nov 05, 2011, 02:16 PM
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The motor shaft is 5mm , but the prop adapter is 8mm
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Old Nov 05, 2011, 09:03 PM
I do all my own crashes
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United States, NH, Rochester
Joined Jan 2011
243 Posts
Skywalker Power setup

Format borrowed as well..... thanks


Weight: don't know.
Motor: G Force 35-36 1250kv
Prop size: 9x6 APC
ESC: hobbywing 40AMP (signal only used)
Separate BEC: BEV 4A and ferrite on output
Servos used: HXT 9G
Flight battery: 1 or 2 3S 5000mA 25C
Video battery: same as above
Flight cam: security system 2000 520TVL
VTX: FOX 800Ma 1280Mhz
VTX antenna: IBCrazy Clover
RX: Dragon Link
RX antenna: Stock DL
Stabilizer: RVOSD Gen5
OSD: RVOSD Gen5
OSD to VTX/CAM: Standard 24awg servo wires
LRS: Dragon Link
Cruise minimal consumption: 8-10A
Max speed: 58MPH
Max distance reached: 2 miles (10 miles round trip)
RTX: Dragon Link
RTX antenna: Stock Long Range
VRX 1 and 2: Range Video 1.3Ghz
Diversity: Range Video
VRX 1 antenna: IBCrazy Skew plannar wheel
VRX 2 antena: 5 turn helical
Ground station battery: 12 volt lead acid 7000mAh
Video distribution: PYLE 4 channel video amp
Flight recording: GoPro Hero / Sony VRD-MC6
Flight control viewing: 19” LCD and Headplay’s
Flight backup viewing: Sony DVD VRD-MC6
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Last edited by Wingnut13; Nov 05, 2011 at 09:36 PM.
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Old Nov 05, 2011, 10:19 PM
Nakelp
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United States, NJ, Union
Joined Sep 2004
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Great
THX Wingnut :-)
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Old Nov 06, 2011, 05:50 AM
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Australia, VIC, Melbourne
Joined Oct 2007
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Great thread. What are your thoughts on the Turnigy Aerodrive SK3 - 3536-1200kv for the skywalker ?

http://www.hobbyking.com/hobbyking/s...ner_Motor.html
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Old Nov 10, 2011, 08:59 PM
2Vision-Air
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Canada, QC, Blainville
Joined Aug 2009
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I did my own testing with my setup and different prop, here is my result.

this is my motor NTM Prop Drive Series 35-36A 1400Kv / 550W

ESC : TURNIGY Sentry 40amp Speed Controller

1st prop : APC style propeller 9x6-E

44.58A 501W 1.83kg

2nd prop : Master Airscrew propeller 9x5

38.65A 439W 1.63kg

3rd prop : Master Airscrew propeller 9x4

26.89A 310W 1.30kg

Funny how my result are not at all like the other test in this thread.
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Old Nov 11, 2011, 01:10 AM
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Quote:
Originally Posted by bakchos View Post
I did my own testing with my setup and different prop, here is my result.

this is my motor NTM Prop Drive Series 35-36A 1400Kv / 550W

ESC : TURNIGY Sentry 40amp Speed Controller

1st prop : APC style propeller 9x6-E

44.58A 501W 1.83kg

2nd prop : Master Airscrew propeller 9x5

38.65A 439W 1.63kg

3rd prop : Master Airscrew propeller 9x4

26.89A 310W 1.30kg

Funny how my result are not at all like the other test in this thread.
Interesting, the only thing that comes to mind are, were you running a 3S or 4S battery. And you said you are running an NTM motor, I was running a Turnigy, there could definitely be internal differences in the motors.
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Old Nov 11, 2011, 06:54 AM
2Vision-Air
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Canada, QC, Blainville
Joined Aug 2009
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Quote:
Originally Posted by thekubiaks View Post
Interesting, the only thing that comes to mind are, were you running a 3S or 4S battery. And you said you are running an NTM motor, I was running a Turnigy, there could definitely be internal differences in the motors.
I am on 3S.

I will test in the air and check the cruise speed/amp, if the 9x4 is not enough i will use the 9x5 and i will be within the ESC range.
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Old Nov 11, 2011, 11:54 AM
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Quote:
Originally Posted by bakchos View Post
I am on 3S.

I will test in the air and check the cruise speed/amp, if the 9x4 is not enough i will use the 9x5 and i will be within the ESC range.
Yes, please let me know what you are getting for cruise, if you could get me a thrust at around 8 amps that would be helpful. I am at the point now in FPV where I am seeking max efficiency. Daemon seems to be able to cruise at around 6.8 amps in his Skywalker but he has a very nice Scorpion motor.

the difference between cruising at 6.8 amps and 8.3 amps can be several miles.
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Old Nov 11, 2011, 01:03 PM
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deleted..
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Old Nov 11, 2011, 02:25 PM
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Lakewood, Colorado
Joined Aug 2002
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Actually it was 3300mAh over 30 minutes so 6.6A average draw and with a little
more attention to clean aerodynamics, could easily get it lower than that. Get
you CG back where it needs to be to fly efficiently (this is *really* important),
and fly as slow as the plane will go and you should be able to achieve that with
most common motor/prop combos.

ian
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Old Nov 22, 2011, 10:09 PM
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Canada, ON, Toronto
Joined Apr 2011
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I was trying to figure this out and I thought a visual aid would come in handy

So I've condensed the data into a graph for quick review.

Thrust VS Amps



The Prop on the 3S Lipo (best performance of the lot- tested on Turnigy 3536/1450kv motor

All Props on the 4S - tested on Turnigy 3542/1000kv 6 pole motor

So absolute efficiency - the 9x4 APC on 4S (purple)
Best all rounder - the 9x5 MA on 4S (red)
Max Power - 9.5x7.5 Parkzone T28 prop (green)

3S in blue for comparison

credit to thekubiaks for the testing

PS....It would be interesting to see the results with a 10" or 11" prop on the same motor.
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Last edited by idletime; Nov 22, 2011 at 10:19 PM.
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Old Nov 22, 2011, 10:40 PM
If it's to be, it's up to me.
subsonic's Avatar
Sydney, Australia
Joined Jan 2007
3,128 Posts
Why couldn't you plot it with Thrust vs Power? That way the 3S vs 4S data could be comparable.

come to think of it, I always wonder why, for FPV, to people even look at amps. I always set up my OSD to display power (Watts). That way, I know what the motor(s) is(are) putting out, regardless of battery condition. Current readings vary by too much depending on the state of charge to be useful for specifying flight performance for me.

sub
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