8/12/2019 SC Readmefirst

1/2

Scorpion Motors calculator (SC) version 3.60 (freeware)Download from here (post #1):http://www.rcgroups.com/forums/showthread.php?t=736782

Scorpion catalog :Scorpion_Calc_v360.exe presents 142 motor references (all outrunners)Historyv3.47 3 addings : HK3226-900 , -1400 , -1600 (8 dec 2011) pictures includedv3.49 1 adding : HK7050-340 (30 jan 2012) picture includedv3.50 minor bugv3.51 S1804,HK4525, HK4530, HK4535v3.52 New coeff. for APC 5x5Ev3.53 SII 5525, SII 5535 and SII6530 added (10 sep 2012)v3.54 HK 4530-450 (10 jan 2013)v3.55 HK 2520-1360 (18 jan 2013)v3.56 Modification of Performances (Efficiency at ESC level) (02 march 2013)v3.57 S1805-2250 + S2503-1960v3.58 Bug fixed (pictures button)v3.59 SII 4020-xxx, SII 4025-xxx & SII 4035-xxx series added (3x3 references) (27 june 2013)v3.60 Change coeff Kp, Kt of APC9x4.7SF and GWS EP9050DD (17 sep 2013)Install :After downloading the zip file ..Just unzip in any folder.

Contents :VB6 executable Scorpion_Calc_v360.exeOne Scorpion.ini (modified at each pgrm use) to save the preferences and defaultparametersTo recover the original Scorpion.ini , please Download again from the original sourceOne SC_readmefirst.txt (this document)

Running :Simply run the .exe programremark : it is MANDATORY to keep Scorpion_Calc_v360.exe AND Scorpion.ini in theSAME FOLDER

Mandatory Microsoft Visual Basic 6 library: MSVBVM60.dll (1353 kb) version 6.00.9802For open/save functions you need Microsoft files for Common Dialog boxGenerally the following files are already on the PCComdlg32.ocx and Comdlg32.dll (usually in C:\\Windows\System32\ )If not, you have to download (free) from the web (Google search for Comdlg32).

Uninstall :There are no key in the Windows register nothing into the operating system.Just kill manually Scorpion_Calc_v360.exeYou are free to keep or not the .txt or .mmc ASCII documents

Compatibility :There is no warranty that the .mmc files will be compatible with future versionsof the freeware

Screen resolution:Best image with resolutions close to 1280x720 or 1366x768 pixelsWith lower resolutions the Scorpion Calc main window could be trimmed and not comfortable.

Graphs :

8/12/2019 SC Readmefirst

2/2

Principal graph is showing the efficiency versus the current all at WOT (Wide Open Throttle)Blue curve = motor efficiency without the effect of temperature rising (zero running time)Red curve = motor efficiency with the influence of temperature rising (depends of current)Magenta curve = Speed rpm ratio relatively to no current (virtually idle) situation

Algorithms :The author is permanently optimizing the empirical formulas and the coefficientsto tryto get results as close as possible to the last real world testings.

Anyway the performances are uncertain, particularly concerning the temperature rising.The algorithm tries to compute the temperature at the copper wire level.The air flow could get down this figure. It depends of the installation in the plane.

Propellers :Don't forget the possibility to "filter" the brand, in the menu "preferences"If you want all brands choose "All" optionBrands : Aeronaut, Align, APC, Graupner, GWS, Mejzlik and some others.

Remark concerning the propeller simulation.The pitch and the power-static thrust coefficients are uncertain.So the results concerning the absorbed current(absorbed power), static thrust and pitch speed are approximative.If you have yourself some test-results, you can use "generic mode" and change the Abbott and thrust coefficients,in order to get a good fit.The library presents 291 propellers.

A static thrust and power prop calculator is available via the main menu 'propellers'.There is no calculation for in-flight performances.

Generally the thrust is going down when the plane speed / air increases and alsothe consumed power.As a result of this "unloading" the motor-rpm is slightly going up.

The author accepts to receive propeller samples to test and add on the freeware.

About the authorThis freeware was written by Louis Fourdan, who was born in 1939.Louis is living in Antony, south suburbs of Paris, France. Married, 3 children,7 grand children.He graduated with a degree in electrical engineering from Supelec (France) in 1961.He was an international radar expert (Thomson CSF) with a broad technical spectr

um,from antenna arrays to digital signal processing (DSP) and radar projects.Louis retired in 1997 and wrote a lot of software for hobbyists using the VB6 platform.He is knowledgeable about brushless motors for the RC world and particularly keen about solar-powered RC cars.Louis is the founder-moderator of "Solar-RC-Cars" Yahoo group.French friends call him "Solar Grampa".Another one of his hobbies includes Carambole billiards.