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Dec 05, 2006, 09:22 AM
homo ludens modellisticus
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e-flight calculators, motor- and prop-databases (compilation)


I will compile the calculators mentioned in this thread, in this first message.
Please post broken/old/dead links so I can fix/remove them.


Contents
  1. Calculators
  2. Motor- and prop-databases, prop-tools
  3. Motor and calculator theory
There is some overlap between the three lists, and double entries.


1. Calculators
  1. Drive Calculator
    Motor analysis and computation of the complete power system.
    Christian Persson/Helmut Schenk, English & German, Windows/Mac/Linux
    www.drivecalc.de
  2. Propellor Calculator
    Computes the performance data of propellers with a given geometry, notably in-flight thrust and power drain across the utilizable airspeed range.
    Helmut Schenk, English & German, Windows & Mac
    www.drivecalc.de
    → propellor calculator (bottom of page)
  3. MM_calc
    Louis Fourdan, English
    electrofly.free.fr
    → téléchargements (link at top of page)
    → moteurs
    → MM_calc
    → English or French version
    Help/discussion/announcements/bug-reports/pats-on-shoulder:
    Aero-nuts freeware - RCG
  4. MM_Calc derivatives
    All 6 are on rep. websites and/or RC-Groups + electrofly.free.fr
  5. eCalc (€/$)
    propCalc, xcopterCalc, fanCalc, heliCalc
    English, Deutsch, Čeština, 中文, Español, Português, Français, 日本語, فارسی, Polski, Pусский, Nederlands
    5$ a year subscription
    www.ecalc.ch
    Youtube channel
    xcopterCalc tutorial
    www.rcgroups.com/forums/showthread.php?t=2101447
    propCalc tutorial
    plane.ardupilot.com/wiki/ecalc-motor-and-prop-efficiency-guide
  6. Online motors and propellers graph tool + theory
    mshtests.co.nf/motor_plots.html
  7. APCE propeller thrust and absorbed power estimating program - RCG
  8. Measuring motor power without standard props, by running the motor with a calibrated "stick" fitted in place of the propeller prop:
    www.rcgroups.com/forums/showthread.php?t=1077012
  9. User yomgui's calculator/optimizer, Excel based
    aerotrash.over-blog.com/pages/Tetacalc_Electric_propulsion_calculator-6330077.html
    www.rcgroups.com/forums/showthread.php?t=606703&page=8&pp=10#post21370664
  10. Motocalc (€/$)
    www.motocalc.com
  11. Elektro-Antrieb (German only, €/$)
    AFAIK the first e-flight calculator, by Wilhelm Geck.
    Site does not exist anymore.
    www.geck-elektroantrieb.de
  12. P-calc
    brantuas.com/ezcalc/dma1.asp
  13. ElectriCalc
    www.slkelectronics.com
    Sid Kauffman - ElectriCalc Designer & Friend
  14. Mumtats, user vintage1
    MUMTATS IS HERE! For inveterate experimenters and motor builders
  15. user Rod Badcock's thrust-, prop- and motor-calculators
    www.badcock.net
  16. WebOcalc and PowerCalc (Free Open Source Software)
    web.archive.org/web/20161012020813/http://flbeagle.rchomepage.com/software/webocalc_1.7.6/webocalc.html
    (flbeagle.rchomepage.com → software)
    Help/discussion/announcements/bug-reports/pats-on-shoulder:
    WebOCalc - Free, easy power system help! - RCG
    WeboCalc - Free software for choosing motors - Part III - RCG
  17. Adam One Motor/Prop and Thrust calculators (freeware)
    www.rcplanes.online
  18. Thrust calculator (freeware)
    www.lcrcc.net/thrust_calc.htm
  19. Thrust calculator (freeware)
    www.gobrushless.com/testing/thrust_calculator.php
  20. Prof. Mark Drela's prop calculator
    web.mit.edu/drela/Public/web/qprop
  21. Dr. Martin Hepperle's prop tools
    www.mh-aerotools.de/airfoils
    → Javaprop
  22. Jim Blanner's (user jrb) calculator
    www.rcgroups.com/forums/showatt.php?attachmentid=1621267
  23. PropEngine, Jim Kitt a.k.a. Aeroplayin - RCG
    Power Systems for Extreme Flight Fanatics! - RCG
    rcwebclub.com/PropEngine.aspx
    www.rcwebclub.com/Portals/1/How_to_Use_PropEngine_09172013.pdf
  24. RC E-Calc - Electric flight calculator for Android phones
    play.google.com/store/apps/details?id=appinventor.ai_graham_dyer.RC_Ecalc_Pro
  25. Flight Calc, for props, edf's and helis
    www.castlecreations.com
    → support
    → tech support
    → Flight Calc

2. Motor- and prop-databases, prop-tools and theory
  1. Lots of prop info and links in Louis Fourdan's sticky
    Propellers (sticky)
  2. Motor Data - test bench data for several hundred brushless motors - RCG (sticky)
    The database, several selection options
    www.flybrushless.com
  3. APC propeller performance data
    www.apcprop.com/v/downloads/PERFILES_WEB/datalist.asp
  4. rcaeronotes.wordpress.com (RCG user aeromodel03)
    → Model airplane propellers
    → APCE ropeller Ct and Cp oefficients
    &
    → APC sport propeller characteristics
  5. Flybrushless prop database
    www.flybrushless.com/prop/search
  6. Prof. Michael Selig's propdata and tools, a.o. APC props
    m-selig.ae.illinois.edu
  7. Aeronaut, APC & Slowflyprop
    old.torcman.de/index_e.htm
    → TM Configurator
    → Aeronaut, APC & Slowflyprop tabs
  8. APCE propeller thrust and absorbed power estimating program - RCG
  9. Determining motor constants
    www.bavaria-direct.co.za
    → motor constants
    Christo van der Merwe a.k.a. RCG user Skylar
  10. How to add tested motor data to Drive Calculator by Ken Myers (www.theampeer.org)
    Collecting Motor Data for Input Into Drive Calculator
  11. Measuring Brushless Motor Resistance (Two Digital Meter Method) - WFF
  12. Practical diy dynamometer - RCG
  13. Several diy test rig designs, thrust and dynamoter
  14. Theory and profiles by dr. Helmut Quabeck
    www.hq-modellflug.de

3. Motor and calculator theory
The math behind it all. Finally
  1. Determining motor constants
    www.bavaria-direct.co.za (Christo van der Merwe a.k.a. RCG user Skylar)
    → motor constants
  2. Feature Article - Motor constants, how to find them and use them - RCG, by Joachim Bergmeyer
    The article is about brushed motors, however, math is identical for both brushed and brushless motors
    A brushless motor in combination with it's controller behaves just like a brushed motor. It is a brushed motor with electronic commutation (the ESC) instead of mechanical commutation (the brushes).
  3. www.astroflight.com/explanation-of-motor-terminology.html
  4. Motor equations by Stefan Vorkoetter, author of Motocalc (thanks Christo/Skylar)
  5. Motor Modellierung Theorie, by Helmut Schenk (pdf, German)
  6. krex.k-state.edu/dspace/bitstream/handle/2097/1507/JamesMevey2009.pdf
    chapter 3 : Motor + ESC theory and modelization
Vriendelijke groeten Ron
Cumulus MFC, Nijmegen, Nederland • Drive Calculator group
diy brushless motor groupdiy motor building tips & tricks
Last edited by Ron van Sommeren; Nov 23, 2018 at 06:35 PM.
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Dec 05, 2006, 09:48 AM
kit
kit
Registered User
http://www.lcrcc.net/thrust_calc.htm
Dec 06, 2006, 02:20 PM
Registered User
Dr Kiwi's Avatar
Here is another one for thrust/rpm: http://www.gobrushless.com/testing/t...calculator.php

and another estimator: http://www.adamone.rchomepage.com/calc_motor.htm
Dec 19, 2007, 11:36 AM
Registered User
Fourdan's Avatar

Brand dedicated Motor Calc


Hi

In the serie you have
MM_Calc (see Ron post #1) on electrofly
You have the cousins in any order
1) Scorpion Calc http://www.scorpionsystem.com/downloads/
here v3.68 (sep 2017) : https://www.rcgroups.com/forums/showthread.php?t=736782
SC v4 beta with plane wizard : https://www.rcgroups.com/forums/show....php?t=1388429
2) Dualsky Calc v3.26 04 feb 2017
https://www.rcgroups.com/forums/show...0#post12693433
3) MotrolFly Calc 2.36 http://www.subsonicplanes.com april 2009
4) ARC Calc https://www.rcgroups.com/forums/show...819392&page=25 post #373 pg 25
5) Aero-nuts Calc http://www.aero-nuts.com seems out of service in 2018
6) Himax Calc v2.35 http://www.maxxprod.com/
All 6 are on rep. websites and/or RC-Groups + electrofly
I update regularly

Louis (the author)
Last edited by Fourdan; Feb 19, 2018 at 05:58 PM. Reason: SC version 3.68
Dec 19, 2007, 01:34 PM
jrb
jrb
Member
jrb's Avatar
Here's my spreadsheet (have EDF version too); its helped me with these and others:
Dec 29, 2007, 01:52 PM
Registered User
Prof. Drela has recently released a windows version of QPORP, his motor/prop analysis software. I've found it much better at predictions and efficiency calcs, since it uses a much more advanced prop model (not just thrust coefficients). Here's an exerpt of the manual:

QPROP is an analysis program for predicting the performance
of propeller-motor combinations. Its intent is to provide
an alternative to the existing prop/motor simulation programs,
which use relatively simple propeller models, and assume
a brushed DC motor type. QPROP has a relatively sophisticated
and accurate prop aerodynamic model, and a general motor model
which can be implemented via a user-supplied subroutine
if necessary.

It's a little more complex than motocalc, but pretty simple to use once you climb the learning curve.

http://web.mit.edu/drela/Public/web/qprop/
Jan 06, 2008, 03:12 AM
Registered Aircraft Offender
Truglodite's Avatar

Eagle Tree Spreadsheet


i rigged up this spreadsheet for use with my eagle tree micro logger (with temp and rpm expanders):

Excel Spreadsheet (freeware)
Example Spreadsheet (freeware)

it supports quick & simple copy/paste operation directly from the eagle tree software, and outputs thrust, efficiency, kV, Io, Rm, max efficiency, max power, pitch speed... pretty much everything. for kicks i included standard deviations for every number.

it is based on rod badcock's spreadsheet (see post #1), and includes a few other calculations based on these equations. keep in mind it's in beta stage at the moment, and i'm not 100% sure if it'll work with pre o2k3 excel. the example sheet shows what it looks like with all the data entered from a bench test i did on a custom bluewonder.

just like badcock's spreadsheet, both of these spreadsheets include macros, so you may have to modify your security settings for them to work properly.

kev

[edit: i just found an error in the spreadsheet which will cause it to be inaccurate if the logger is set to record temperature in farenheit. it works perfectly with the logger set to celcius. i'm working on a temperature unit selector, but until i update use celsius please.]
Last edited by Truglodite; Jul 15, 2008 at 04:25 AM.
Jan 24, 2008, 09:10 PM
Registered User
BlazerB52's Avatar
Nice converter program:
Last edited by BlazerB52; Jan 24, 2008 at 09:17 PM.
Mar 07, 2008, 09:04 AM
Carlos Reyes

www.RCadvisor.com - new free model airplane calculator


My new free online calculator (www.RCadvisor.com):
  • designs efficient electric power systems
  • teaches you using interactive Tutorials and ToolTips
  • flies your model in a virtual wind tunnel
  • predicts airfoil performance
  • shows you the right tradeoffs for your scale model
  • displays graphs that update in real-time
  • runs on Windows, Linux and Mac OS X
Last edited by creyes123; Sep 09, 2008 at 08:50 PM.
Mar 27, 2008, 11:06 PM
Carlos Reyes
My calculator (www.RCAdvisor.com) includes the estimated Climb Rate. The Climb Angle seemed less useful. I don't provide feet/minute (easy to add), but I have MPH and feet/second among other units.
Jul 09, 2009, 04:45 PM
homo ludens modellisticus
Ron van Sommeren's Avatar
Measuring motor power output using a calibrated dummy prop:
https://www.rcgroups.com/forums/show....php?t=1077012

Vriendelijke groeten Ron
Last edited by Ron van Sommeren; Oct 15, 2009 at 03:16 PM.
Aug 08, 2009, 07:29 PM
Registered Aircraft Offender
Truglodite's Avatar
I'm in the process of moving all my "freeware", including MotorXLT2 and TurnCalculator3, to my blog for easier maintenance. Here's the link:

https://www.rcgroups.com/forums/show...44#post8108089

Note that I recently updated MotorXLT2 with my latest version, which includes calculations based on up to 4-props and no-load. This makes the calculations much more accurate. I also made the no-load page more "printer/screen grab" friendly, for easy posting of test results. Unfortunately, I still haven't got around to making a temperature unit selector, so you'll have to record temps in Celsius.

A general tip to those who benchmark:
Just like any other motor constant calculator, when setting up a series of tests you need to avoid using 2 props that are nearly identical (with respect to RPM, A, and V). Use of similar props often leads to inaccurate calculations of Rm, Kv, and Io. An example of this would be the apc5x5e and apc5.5x4.5e. While they fly very differently, both will give nearly identical RPM and current on the bench, which will confuse a motor calculator.

Cheers,
Kev
Oct 15, 2009, 01:38 PM
Registered User
peterangus's Avatar
Quote:
Originally Posted by Ron van Sommeren
Measuring motor resistance without standard props, by using a dummy prop:
Post 11

Should read "measuring motor power output using a calibrated dummy prop".
Mar 06, 2010, 09:53 PM
Scratch building addict
rotagen's Avatar
What cracks me up about a lot of these calculators is they only have very expensive brands of components in the database.

Its like an advertisement. Nowadays things are great for the consumer, i've found some amazing good deals on very well engineered power systems, at about 1/10 the cost of hackers, scorpions, etc...certainly in the same performance ballpark at least.
Mar 30, 2010, 03:56 AM
electric power,what else!
eJets's Avatar
@rotagen
it is not a matter of expensive or cheap motors - it's a matter of motor data availability, and this availability is the general problem of cheap motors....

feel free sending PM with motor data (Kv, Internal Resistance Ri, Idle Current Io, Power or Current Limit, Housing length and weight) of cheap motors.

Cheers eJets

http://www.s4a.ch/eflight/motorcalc_e.htm
http://www.s4a.ch/eflight/fancalc_e.htm


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