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Oct 29, 2012, 06:47 AM
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Dr Kiwi's Avatar
Quote:
Originally Posted by Maggie.Y
I don't think so , may be there are some similar in appearance , is normal .
I know many motors looks the same , but different the testing results . Right ,
Dr Kiwi ?
Since the company seems to be unwilling/unable to send out any motors for testing (ask Louis Fourdan) we may never know how they perform in independent testing!
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Oct 29, 2012, 10:44 PM
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Maggie.Y's Avatar
Quote:
Originally Posted by Dr Kiwi
Since the company seems to be unwilling/unable to send out any motors for testing (ask Louis Fourdan) we may never know how they perform in independent testing!
Is that so ? I know many company will not provide free motor sample , because that will be expensive . But they should be provide others detail if customer would like to . it is their responsibility.
I agree you , Dr Kiwi , the testing results decide motor quality in a way .
Nov 15, 2012, 06:07 AM
Registered User
yang1346888's Avatar
Quote:
Originally Posted by Dr Kiwi
Since the company seems to be unwilling/unable to send out any motors for testing (ask Louis Fourdan) we may never know how they perform in independent testing!
I'll have to send the test parameters, thank you for your support!
Nov 15, 2012, 01:12 PM
Why kamikaze pilot wear helmet
mikes68charger's Avatar
If eather one of your 5055/5065 motors have a at least a 500kv and can handle 6s then I will try/Buy one.

Im trying to spin an APC 12X8 nitro prop at 14k at about our under 100amps
Nov 15, 2012, 05:42 PM
ex-noob
Lardog's Avatar
If you want 14K RPM on 6s, you'll need more than 500kv. You'll need a motor that can do around 630rpm/volt under load. 14000 / 22.2 = 630.

I had a Rimfire .46, which is an 800Kv motor, spinning an APCE 12x6 at ~14K rpm on 6s. Pulled about 80A
Nov 15, 2012, 06:12 PM
Good Better Best quest.
olmod's Avatar
Quote:
Originally Posted by yang1346888
I'll have to send the test parameters, thank you for your support!
My goodness you had the offer from Dr Kiwi a tester who most will agree is quite thorough and reliable and you dont even want to send even a small motor for testing to see if his results are the same as yours

who would send a sales person into the world ill equipped to market a product you so far have offered no specifications relating to prop sizes and Volts /amps required.
Nov 16, 2012, 07:31 AM
Registered User
yang1346888's Avatar
Quote:
Originally Posted by olmod
My goodness you had the offer from Dr Kiwi a tester who most will agree is quite thorough and reliable and you dont even want to send even a small motor for testing to see if his results are the same as yours

who would send a sales person into the world ill equipped to market a product you so far have offered no specifications relating to prop sizes and Volts /amps required.
You‘re rightt!
Nov 16, 2012, 04:18 PM
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Dr Kiwi's Avatar
What is that motor's Kv?

Ambient temperature? How long was it run at WOT before temperatures were recorded? Where were temperatures taken.. from the windings, or from the outside of the bell... with a thermoprobe, or an IR gun?
Nov 16, 2012, 07:03 PM
Registered User

Picky


We make motor.

You buy motor.

All good.
Nov 17, 2012, 06:49 PM
Registered User
Dr Kiwi's Avatar
I am concerned about the data sheet posted in Post#22.. that 10x8 EP is seriously over-loading the motor, such that efficiency is down to 54%! That is why I questioned the duration of the test.. to see when the 50C temperature was reached. 240W through a 54.5g motor is asking for trouble and on the higher voltages those GWS RS props are exceeding their safe RPM limits (probably no more than 40-50,000 rpm/diameter.. yet these tests are running 'em at 60-70,000rpm/diameter).

I also question the thrust figures.. DriveCalc, Badcock, MotoCalc, FlyBrushless etc have decent "Thrust from RPM" data.. the figures posted in this table are as much as 20-30% higher than can be expected from prop x at RPM y.
Last edited by Dr Kiwi; Nov 17, 2012 at 08:39 PM.
Nov 17, 2012, 07:17 PM
Night Flying
Ron H's Avatar
Quote:
Originally Posted by cyclops2
We make motor.

You buy motor.

All good.
We buy motor.

Not good motor.

Now what?
Nov 17, 2012, 07:52 PM
Registered User
Nov 18, 2012, 06:19 PM
Registered User
Fourdan's Avatar
Quote:
Originally Posted by yang1346888
I'll have to send the test parameters, thank you for your support!
Hi
If you want a software similar to Scorpion Calc or Dualsky Calc I can do it
Louis
Nov 18, 2012, 08:09 PM
Registered User
Maggie.Y's Avatar
Quote:
Originally Posted by Dr Kiwi
I am concerned about the data sheet posted in Post#22.. that 10x8 EP is seriously over-loading the motor, such that efficiency is down to 54%! That is why I questioned the duration of the test.. to see when the 50C temperature was reached. 240W through a 54.5g motor is asking for trouble and on the higher voltages those GWS RS props are exceeding their safe RPM limits (probably no more than 40-50,000 rpm/diameter.. yet these tests are running 'em at 60-70,000rpm/diameter).

I also question the thrust figures.. DriveCalc, Badcock, MotoCalc, FlyBrushless etc have decent "Thrust from RPM" data.. the figures posted in this table are as much as 20-30% higher than can be expected from prop x at RPM y.
I think , everything will be clear when you buy a sample motor and testing it .
If I were you I would do that , because I must be know the motor is good or bad at that time .
Nov 18, 2012, 08:15 PM
Registered User
yang1346888's Avatar
Quote:
Originally Posted by Dr Kiwi
What is that motor's Kv?

Ambient temperature? How long was it run at WOT before temperatures were recorded? Where were temperatures taken.. from the windings, or from the outside of the bell... with a thermoprobe, or an IR gun?
The motor is KV880, temperature is the first time use IR gun test.


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