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Old Jan 24, 2009, 01:47 PM
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Carl Petersen's Avatar
United States, AZ, Quartzsite
Joined Mar 2002
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Quote:
Originally Posted by Fourdan
Hello
It seems you are right.
I have to open the VB6 hood to correct
Thanks
Louis
No thanks required. Thanks to you for providing a very useful tool.

As a side note I've had an oppertunity to use Real Software's REALBasic. The main advantage is that it will generate Windows, Mac X OS, and Linux executables from one source tree. Disadvantage it cost money for the Windows and Mac X OS version At least the Linux version is free.
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Old Jan 25, 2009, 03:46 PM
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Fourdan's Avatar
Antony (France)
Joined Sep 2003
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New version 3.15

Hi
Scorpion Calc updated v3.15
Minor bug on v3.13 (about menu) and v3.14 (about prop filtering)
Refer to post#1
Louis
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Old Feb 04, 2009, 08:33 AM
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Fourdan's Avatar
Antony (France)
Joined Sep 2003
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New version 3.16

Hi
Scorpion Calc updated v3.16
Refer to post#1
Added : new version 2 motor SII 3014-1040 (1070)
No picture for now
Louis
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Old Mar 05, 2009, 02:10 PM
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Joined Oct 2004
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newbie question,

How can I calculate, or is it already in the software, estimated WOT run time ?
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Old Mar 05, 2009, 03:28 PM
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Fourdan's Avatar
Antony (France)
Joined Sep 2003
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Quote:
Originally Posted by Kregan
newbie question,

How can I calculate, or is it already in the software, estimated WOT run time ?
Hi
In Scorpion Calc all results are for "full throttle" (WOT)
If you consider partial throttle it is equivalent approximatively to reduce the source voltage with "some percentage", reducing also the motor speed, the thrust, the average current, the power ...
Regards
Louis
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Old Mar 06, 2009, 04:23 AM
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Fourdan's Avatar
Antony (France)
Joined Sep 2003
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New version 3.17

Hi
Scorpion Calc updated v3.17
Refer to post#1
New : "no load" button bug fixed
Louis
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Old Mar 06, 2009, 07:30 PM
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Joined Oct 2004
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Thank you for the reply.
What I meant to say was how do I calculate flying time at WOT with the scorpion calculator?


Quote:
Originally Posted by Fourdan
Hi
In Scorpion Calc all results are for "full throttle" (WOT)
If you consider partial throttle it is equivalent approximatively to reduce the source voltage with "some percentage", reducing also the motor speed, the thrust, the average current, the power ...
Regards
Louis
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Old Mar 06, 2009, 10:33 PM
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methos's Avatar
Canada
Joined Jun 2006
384 Posts
I'm getting an error of temp too high with any of the 4025-** motors on 7s Lipo when I increase the motor on time, and increase the prop size just a little.

I'm not getting this error with any of the 4020-** motors.
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Old Mar 07, 2009, 06:04 PM
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Fourdan's Avatar
Antony (France)
Joined Sep 2003
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Quote:
Originally Posted by Kregan
Thank you for the reply.
What I meant to say was how do I calculate flying time at WOT with the scorpion calculator?
Hi
For now the battery capacity (Ah) is not implemented as an input data.
So the flight duration is not computed.
S Calc is just giving the absorbed current.
If you divide Ah by this current (A) you get the flying time in hour.
Multiply by 60 you get it in minutes.
Louis
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Old Mar 07, 2009, 06:19 PM
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Fourdan's Avatar
Antony (France)
Joined Sep 2003
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Quote:
Originally Posted by methos
I'm getting an error of temp too high with any of the 4025-** motors on 7s Lipo when I increase the motor on time, and increase the prop size just a little.

I'm not getting this error with any of the 4020-** motors.
Hi
Could you indicate to me
* 7S (25.9V)
* ref of S4025 -xx (Kv ?)
* prop selected
* running time in minutes
So I could analyze the problem.

Have you tested that setup in the real world ?
If yes I am interested by your results and the temperature reached.

For information temperature is "predicted-estimated" by SC at the stator flange, with a good venting of the motor by the prop.

Thanks
Louis
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Old Mar 07, 2009, 06:26 PM
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United States, NV, Pahrump
Joined Aug 2004
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Fourdan,

I think Methos "motor on time" setting is just set too high. Can you explain what this setting does/is for?
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Old Mar 07, 2009, 07:13 PM
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Fourdan's Avatar
Antony (France)
Joined Sep 2003
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Quote:
Originally Posted by ramovan
Fourdan,

I think Methos "motor on time" setting is just set too high. Can you explain what this setting does/is for?
Hi Ramovan

In SC I have tried to predict the performances with the maximum of influences.
"running time" is simulated inside to "rise the temperature", taking into account some C/W and some thermal time constant.
a) excessive temperature is the #1 danger for the motor
b) operating point is varying due to Rm increase (copper conductivity constant variation)

On the contrary of Drive Calc algorithm that is taking an average dynamic resistance, Rm is not fixed in SC, but re-calculated for every setup point.

Regards
Louis
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Old Mar 10, 2009, 07:07 PM
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methos's Avatar
Canada
Joined Jun 2006
384 Posts
7S 25.9V
S 4025 - 12
APC 13 x 8
On Time 10 min

I'm guessing, maybe I'm wrong, but motor on time is the estimated flight duration if you were to fly max throttle?

I also put in 5 min with the APC 11 x 9E with the 4025-10 and got the same thing... motor temp warning. 137.4C even though the amps were only at 60.
Here are a couple screen shots:





Quote:
Originally Posted by Fourdan
Hi
Could you indicate to me
* 7S (25.9V)
* ref of S4025 -xx (Kv ?)
* prop selected
* running time in minutes
So I could analyze the problem.

Have you tested that setup in the real world ?
If yes I am interested by your results and the temperature reached.

For information temperature is "predicted-estimated" by SC at the stator flange, with a good venting of the motor by the prop.

Thanks
Louis
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Old Mar 11, 2009, 05:52 AM
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Fourdan's Avatar
Antony (France)
Joined Sep 2003
3,004 Posts
Hi Methos

For the S4025-12 on 7S LiPo with APC 13x8E..
the temperature is 133.5 C for 10 minutes WOT
The warning is reached for the next prop that is in fact the APC 14x7E (at 148.4C for 1195W), and the background is kept on the previous 13x8 prop.

1) It is possible for the user to suppress the warnings (in Preferences menu)

2) It is very difficult to simulate the rising temperature behaviour.
I use Kc C/W and thermal constant Th in minutes.
For now those 2 coeff are fixed. In the real world they vary with the efflux air velocity and with the aerodynamics environment.
I know that I have to work on this subject to change Kc and Th as a function of the efflux velocity (or pitch speed)
Presently Kc and Th are constants for one motor.
That is in my Todo list

3) In my Todo list there are several tasks before that temperature behaviour
a) Embed new SII Scorpion motors
b) Finish the Plane-Wizard sheet to select automatically the right setup
---
To give some words on your config S4025-12 on 7S and APC 13x8E
That set up is beyond my limit on my Power Supply PS MRGN 900
(limits are 15-60A or 30V-30A or 60V-15A)
So I have not tested that, nor on my PS, nor on a pack

Prediction is around 25.9V 42A = 1087 W for a motor 353g
That is 3.08 W per gram of motor.
It is probably close to the limit for 3-4 minutes.
I don't know if Lucien tested that.
If yourself want to try (under temperature monitoring) I would be interested by the results.

Louis
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Old Mar 18, 2009, 02:47 PM
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Fourdan's Avatar
Antony (France)
Joined Sep 2003
3,004 Posts
New version 3.18

Hi
Scorpion Calc updated v3.18
Refer to post#1
New1 : improved "no load" current management
New2 : SII 3014-830 motor (I measured Kv 878 rpm/V on my sample)
Louis
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