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« on: September 11, 2014, 10:11:30 PM »
rohan123
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hello everyone, i need to choose a prop for my dys 1400kv brushless motors(specs are below) ,i have a 10X4.5 can i use it??
specs of the motor:
KV: 1400
Configuration: NP
Stator Diameter: 22mm
Stator Length: 8mm
Shaft Diameter: 3.17mm
Motor Dimensions(Dia.*Len): Φ28×26mm
Weight: 44g
No.of Cells(Lipo): 2-4S
Max Continuous current: 26A
Max Continuous Power: 384W
Internal resistance: 0.106Ω
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« Reply #1 on: September 12, 2014, 05:57:49 AM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
You would be stretching that motor too far on that prop. Go for a 7*4.5, 8*5, or maximum 9*47 SF - the last will draw nearly 30 A
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« Reply #2 on: September 12, 2014, 06:07:03 AM »
madaquif
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hey rohan.....which battery do you plan to use?

2 3 or a 4 cell Huh?
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« Reply #3 on: September 12, 2014, 04:12:45 PM »
rohan123
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im using a 2200 mah 3s 25C 11.1v lipo...
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« Reply #4 on: September 12, 2014, 04:38:03 PM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
That motor is the same as this:

http://www.hobbyking.com/hobbyking/store/__12920__D2826_10_1400kv_Brushless_Motor.html

See the prop indicated; same as I told you
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« Reply #5 on: September 12, 2014, 05:05:44 PM »
K K Iyer
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@rohan123,
DYS site does not show any 2826 motor of 1400kv, of 44gms and 384 watts.
http://www.dys.hk/ProductShow.asp?ID=30
Their 2826-10, 1400kv (as well as the motor mentioned by Rai saheb) are rated for 205 watts
The pamphlet that came with the Turnigy 2826-10/1400 specifies 7x4 for 3s and 9x4.7 for 2s

Perhaps you may need to verify the motor specs again.
Maybe it is not DYS or Turnigy at all, or maybe it is a different size!
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Re: which prop to use???
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« Reply #6 on: September 12, 2014, 05:24:00 PM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
Iyer sir, it's obviously at 4S. 384 watts, @ 26 Amps => 14.8 V
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« Reply #7 on: September 12, 2014, 05:30:24 PM »
docnayeem
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Re:
384 watts!  Rai sir aren't we expecting too much from this motor...?
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« Reply #8 on: September 12, 2014, 05:39:39 PM »
docnayeem
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Re:
If we go by numbers... 
A 10*4 prop with a voltage of 14.8 (4 cell)  and spinning at 1400 kv would require a motor of 1300 odd watts...
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« Reply #9 on: September 12, 2014, 05:42:20 PM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
Quote from: docnayeem on September 12, 2014, 05:30:24 PM
384 watts!  Rai sir aren't we expecting too much from this motor...?

Those are not my figures Doc!

IMHO this motor is good for 200 W. Period.

Unless it's a Hacker, Scorpion, AXI; this is just a case of some Chinese manufacturer showing off his size Cheesy
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« Reply #10 on: September 12, 2014, 05:43:02 PM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
Quote from: docnayeem on September 12, 2014, 05:39:39 PM
If we go by numbers... 
A 10*4 prop with a voltage of 14.8 (4 cell)  and spinning at 1400 kv would require a motor of 1300 odd watts...

How?
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« Reply #11 on: September 12, 2014, 05:52:18 PM »
K K Iyer
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Quote from: sanjayrai55 on September 12, 2014, 05:24:00 PM
Iyer sir, it's obviously at 4S. 384 watts, @ 26 Amps => 14.8 V
@sanjayrai55 sir,
Oops, i missed that!
Surely one would expect DYS and/or Turnigy to publicise 384 watts instead of 205.

@rohan123
Could you post pics of the motor and the spec sheet please?
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« Reply #12 on: September 12, 2014, 06:28:07 PM »
docnayeem
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Re:
Sanjay sir... I use a webcalc routinely
http://adamone.rchomepage.com/calc_thrust.htm
Please have a look
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« Reply #13 on: September 12, 2014, 06:32:46 PM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
I don't agree with it. Reality is something else.

As you know, I do my own testing. I have run a 2826-1400 with a 10*4.5 at 3S, goes to about 24 A.

At 4S will go to about 30 A.

What actually happens is as the motor capacity is reached, the RPM drops. So V drops, the wattage peaks out. If you continue running, it burns out  >Cheesy
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« Reply #14 on: September 12, 2014, 06:55:06 PM »
rohan123
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Photos of my motor... It says BE2208-1400Kv on it
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Re: which prop to use???
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« Reply #15 on: September 12, 2014, 07:02:35 PM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
Item No.   NO LOAD   ON LOAD   LOAD TYPE
BE2208-13
(1400KV)   VOLTAGE   CURRENT   SPEED   CURRENT   Pull   Power   Battery/prop
V   A   rpm   A   g   W
7.4   0.4   7970   3.4   170   25.2    LiPoх2/6x5E
9.6   340   71.0    LiPoх2/7x5E
10.3   430   76.2    LiPoх2/8x4E
12.1   530   89.5    LiPoх2/9x6E
11.1   0.5   11930   6.3   380   69.9    LiPoх3/6x5E
16.1   580   178.7    LiPoх3/7x5E
17.1   730   189.8    LiPoх3/8x4E
19   835   210.9    LiPoх3/9x6E
14.8   0.5   15880   9.8   640   145.0    LiPoх4/6x5E
22.1   780   327.1    LiPoх4/7x5E
23.5   960   347.8    LiPoх4/8x4E
26   1060   384.8    LiPoх4/9x6E
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« Reply #16 on: September 12, 2014, 07:03:40 PM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
I think this clears up all. The manufacturers propchart, which should have been posted in the very first place
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« Reply #17 on: September 12, 2014, 07:07:13 PM »
rohan123
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Sorry sir, i was unable to find this data and the seller suggested 10x4.5 props so i bought them,and now im worried i can damage the motors so help me pleasenn
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« Reply #18 on: September 12, 2014, 07:08:49 PM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
What do you want to use it on? Give details
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« Reply #19 on: September 12, 2014, 07:09:47 PM »
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Re:
Can't get that table right Sad it's all smudged up
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« Reply #20 on: September 12, 2014, 07:11:54 PM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
Search DYS 2208 1400 KV on google
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« Reply #21 on: September 12, 2014, 07:12:25 PM »
docnayeem
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Quote from: sanjayrai55 on September 12, 2014, 06:32:46 PM
I don't agree with it. Reality is something else.

As you know, I do my own testing. I have run a 2826-1400 with a 10*4.5 at 3S, goes to about 24 A.

At 4S will go to about 30 A.

What actually happens is as the motor capacity is reached, the RPM drops. So V drops, the wattage peaks out. If you continue running, it burns out  >Cheesy
Sir actually when you shift from 3 cell to 4 cell the current drawn drops and does not increase...  If motor and prop setup is the same....
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« Reply #22 on: September 12, 2014, 07:13:52 PM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
Rohan- the props will work on a 2S with no problem. On a 3S they should be OK, but you should check with a wattmeter
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« Reply #23 on: September 12, 2014, 07:14:34 PM »
sanjayrai55
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Don't wake a Tiger until you've factored the teeth
Doc Nayeem: Have you tried this with measurement?
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« Reply #24 on: September 12, 2014, 07:17:33 PM »
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Quote from: sanjayrai55 on September 12, 2014, 07:14:34 PM
Doc Nayeem: Have you tried this with measurement?
Sir logically
I (current) * V(voltage) = W(Power)
So when power consumed is the same (w)  is constant in both the cases... If V increases.. 'I' has to decrease..
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