New Scorpion Calc v355

The most updated Scorpion Calculator v355 is just released, it includes our Scorpion newest HK-4530-450Kv, HK-3536-510Kv and HK-2520-1360Kv

Please click HERE to download.

Scorpion Motors calculator (SC) version 3.55 (freeware)
Download from here (post #1):

Scorpion catalog :
Scorpion_Calc_v355.exe presents 131 motor references (all outrunners)
v3.47 3 addings : HK3226-900 , -1400 , -1600 (8 dec 2011) pictures included
v3.49 1 adding : HK7050-340 (30 jan 2012) picture included
v3.50 minor bug
v3.51 S1804,HK4525, HK4530, HK4535
v3.52 New coeff. for APC 5x5E
v3.53 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)
Install :
After downloading the zip file ..
Just unzip in any folder.

Contents :
VB6 executable Scorpion_Calc_v355.exe
One Scorpion.ini (modified at each pgrm use) to save the preferences and default parameters
To recover the original Scorpion.ini , please Download again from the original source
One SC_readmefirst.txt (this document)

Running :
Simply run the .exe program
remark : it is MANDATORY to keep Scorpion_Calc_v355.exe AND Scorpion.ini in the SAME FOLDER

Mandatory Microsoft Visual Basic 6 library: MSVBVM60.dll (1353 kb) version 6.00.9802
For open/save functions you need Microsoft files for Common Dialog box
Generally the following files are already on the PC
Comdlg32.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_v355.exe
You 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 versions of the freeware

Screen resolution:
Best image with resolutions close to 1280×720 or 1366×768 pixels
With lower resolutions the Scorpion Calc main window could be trimmed and not comfortable.

Graphs :
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 coefficients to try
to 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” option
Brands : 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 in v3.55 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 also the 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 author
This 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 spectrum,
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.

Line Break - Medium Red

New Released!!! Scorpion HK-2520-1360Kv Motor

Scorpion is delighted to announce our newest HK-2520-1360Kv series is now available. This motor suits for 450 class helicopter with running 6s lipo such as Compass Warp 360. This motor provides all the power that you can use, while still maintaining excellent efficiency and cool running characteristics.

Available on 01st Feb,2013

Scorpion HK-2520-1360Kv Motor
Price: $79.99

Scorpion HK-2520 motors have been developed for the 450 class electric helicopters running on 6-cell Li-Po power such as WARP 360. This motor is designed to provide all the power that you can use, while still maintaining excellent efficiency and cool running characteristics.

Scorpion HK-Series Brushless Motors are built from the best materials available, and are designed to provide both quality and performance at an affordable price. Scorpion starts with high quality aluminum alloy parts that are produced on the latest CNC milling machines. These parts are then gold Electro-Coated to provide a beautiful, long-lasting finish. The stators are made with 0.2mm laminations to give maximum efficiency, and minimum Eddy current losses. The stators are epoxy coated to prevent shorts, and are wound with wire that is rated at 180 degrees C (356 F). The magnets used in Scorpion Motors are custom manufactured to be able to withstand high temperatures, making a motor that is virtually impossible to burn up in normal use.

Scorpion Motors are built to last, and are backed with a 2-Year warranty against defects in materials or workmanship. However, due to the high RPM of these motors, and the fact that we cannot control the installation and setup, the bearings are not covered by the 2-Year warranty, nor is any subsequent damage caused to the motor by a bearing failure. Bearings are a normal wear item, and as such, need to be maintained and changed periodically. For maximum life, make sure that a sufficient gap is left between the pinion and main gear during motor installation to avoid binding, and put a small drop of oil on each bearing every 5-6 flights. It is the responsibility of the pilot to ensure that the bearings are maintained properly.

For the best overall combination of quality, performance, and value, use Scorpion Motors in your helicopter!

Worldwide Patent : Pending


Stator Diameter: 25.0 mm (0.98 in)
Stator Thickness: 20.0 mm (0.79 in)
No. of Stator Arms: 12
Magnet Poles: 10
Motor Wind: 12 Turn Delta
Motor Wire: 9-Strand 0.25mm
Motor Kv: 1360Kv RPM/Volt
No-Load Current (IO/10V): 1.55 Amps
Motor Resistance (Rm): 0.038 Ohms
Max Continuous Current: 30 Amps
Max Continuous Power: 630 Watts
Weight: 108 Grams (3.78 oz)
Outside Diameter: 31.5 mm (1.24 in)
Shaft Diameter: 4 mm (0.15 in)
Body Length: 39.6 mm (1.56 in)
Overall Shaft Length: 62.5 mm (2.46 in)
Max Lipo Cell: 6s
Max Peak Current: 40A (2 seconds)
Max Peak Power: 840 Watts (2 seconds)
Motor Timing: 5deg
Drive Frequency: 8kHz

Included in the Box

1 x Scorpion HK-2520-1360KV Motor
3 x Female Connectors
3 x Heat Shrink
4 x M3 Screws

Weight including packaging


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