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Old Dec 05, 2006, 08:22 AM
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e-flight calculators and propdata (compilation)

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

First the links to prop- and motordatabases, then the list of calculators. There is some overlap, so be sure to check both lists.

1 - Numbers
  1. Motor Data - test bench data for several hundred brushless motors - RCG (sticky)
    The database, several selection options
    www.flybrushless.com
  2. APC propeller performance data
    www.apcprop.com/v/downloads/PERFILES_WEB/datalist.asp
  3. Flybrushless prop database
    www.flybrushless.com/prop/search
  4. Prof. Michael Selig's propdata and tools, a.o. APC props
    m-selig.ae.illinois.edu
  5. Aeronaut, APC & Slowflyprop
    old.torcman.de/index_e.htm
    → TM Configurator
    → Aeronaut, APC & Slowflyprop tabs
  6. Determining motor constants
    www.bavaria-direct.co.za
    → motor constants
    Christo van der Merwe a.k.a. RCG user Skylar
  7. How to for adding tested motor data to Drive Calculator by Ken Myers (www.theampeer.org)
    Collecting Motor Data for Input Into Drive Calculator
  8. Measuring brushless motor resistance
    Measuring Brushless Motor Resistance (Two Digital Meter Method) - WFF
  9. Theory and profiles by dr. Helmut Quabeck
    www.hq-modellflug.de
  10. The math behind calculators and motors.
    Brushless motors are just brushed motors with electronic commutation (the ESC) instead of mechanical commutation (the brushes). Math is identical for both types.
    www.rcgroups.com/forums/showthread.php?t=185271

2 - 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
  4. MM_Calc derivatives
    All 6 are on rep. websites and/or RC-Groups + electrofly.free.fr
  5. 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
  6. 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
    xcopterCalc tutorial
    www.rcgroups.com/forums/showthread.php?t=2101447
    propCalc tutorial
    plane.ardupilot.com/wiki/ecalc-motor-and-prop-efficiency-guide
  7. 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
  8. Motocalc (€/$)
    www.motocalc.com
  9. Elektro-Antrieb (German only, (€/$)
    www.geck-elektroantrieb.de
  10. P-calc
    brantuas.com/ezcalc/dma1.asp
  11. ElectriCalc
    www.slkelectronics.com
    Sid Kauffman - ElectriCalc Designer & Friend
  12. Mumtats, user vintage1
    MUMTATS IS HERE! For inveterate experimenters and motor builders
  13. user Rod Badcock's thrust-, prop- and motor-calculators
    www.badcock.net
  14. WebOcalc and PowerCalc (Free Open Source Software)
    flbeagle.rchomepage.com
    → software
    Help/discussion/announcements/bug-reports/pats-on-shoulder:
    WebOCalc - Free, easy power system help!
  15. Adam One Motor/Prop calculator (freeware)
    www.adamone.rchomepage.com/calc_motor.htm
  16. Thrust calculator (freeware)
    www.lcrcc.net/thrust_calc.htm
  17. Thrust calculator (freeware)
    www.gobrushless.com/testing/thrust_calculator.php
  18. Prof. Mark Drela's prop calculator
    web.mit.edu/drela/Public/web/qprop
  19. Dr. Martin Hepperle's prop tools
    www.mh-aerotools.de/airfoils
    → Javaprop
  20. Jim Banner's (user jrb) calculator
    www.rcgroups.com/forums/showatt.php?attachmentid=1621267
  21. 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
  22. RC E-Calc - Electric flight calculator for Android phones
    play.google.com/store/apps/details?id=appinventor.ai_graham_dyer.RC_Ecalc_Pro
  23. Flight Calc, for props, edf's and helis
    www.castlecreations.com
    → support
    → tech support
    → Flight Calc
Vriendelijke groeten Ron
Cumulus MFC, Nijmegen, Nederland Drive Calculator group
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Old Dec 05, 2006, 08:48 AM
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http://www.lcrcc.net/thrust_calc.htm
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Old Dec 06, 2006, 01:20 PM
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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
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Old Dec 19, 2007, 10:36 AM
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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 v3.66 (march 2016) : http://www.rcgroups.com/forums/showthread.php?t=736782
SC v4 beta with plane wizard : http://www.rcgroups.com/forums/showthread.php?t=1388429
2) Dualsky Calc v3.24 04 march 2013
http://www.rcgroups.com/forums/showt...0#post12693433
3) MotrolFly Calc 2.36 http://www.subsonicplanes.com april 2009
4) ARC Calc http://www.rcgroups.com/forums/showt...819392&page=25 post #373 pg 25
5) Aero-nuts Calc http://www.aero-nuts.com
6) Himax Calc http://www.maxxprod.com/
All 6 are on rep. websites and/or RC-Groups + electrofly
I update regularly

Louis (the author)
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Last edited by Fourdan; Mar 05, 2016 at 05:46 PM. Reason: SC new version
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Old Dec 19, 2007, 12:34 PM
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Here's my spreadsheet (have EDF version too); its helped me with these and others:
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Old Dec 29, 2007, 12:52 PM
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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/
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Old Jan 06, 2008, 02:12 AM
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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.]
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Old Jan 24, 2008, 08:10 PM
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Nice converter program:
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Old Mar 07, 2008, 08:04 AM
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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
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Old Mar 27, 2008, 11:06 PM
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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.
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Old Jul 09, 2009, 04:45 PM
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Measuring motor power output using a calibrated dummy prop:
http://www.rcgroups.com/forums/showthread.php?t=1077012

Vriendelijke groeten Ron
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Old Aug 08, 2009, 07:29 PM
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I'm in the process of moving all my "freeware", including MotorXLT2 and TurnCalculator3, to my blog for easier maintenance. Here's the link:

http://www.rcgroups.com/forums/showt...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
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Old Oct 15, 2009, 01:38 PM
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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".
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Old Oct 15, 2009, 03:14 PM
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Brainfart Thank you Peter, I corrected it.

Vriendelijke groeten Ron
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Old Mar 06, 2010, 08:53 PM
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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.
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