|Dec 05, 2006, 09:22 AM|
e-flight calculators (compilation)
I will compile the calculators mentioned in this thread, in this first message. Please post broken/old/rotten links so I can fix them.
Vriendelijke groeten Ron
• Cumulus MFC, Nijmegen, the Netherlands
• diy motor building tips & tricks
• diy brushless motor discussion group
• Drive Calculator download & discussion group
|Dec 06, 2006, 02:20 PM|
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|
Brand dedicated Motor Calc
In the serie you have
MM_Calc (see Ron post #1) on electrofly
You have the cousins in any order
1) Scorpion Calc www.scorpionsystem.com
here v3.60 (17 sept. 2013) : 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
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)
|Dec 29, 2007, 01:52 PM|
United States, CA, Mountain View
Joined Nov 2006
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
It's a little more complex than motocalc, but pretty simple to use once you climb the learning curve.
|Jan 06, 2008, 03:12 AM|
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.
[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.]
|Mar 07, 2008, 09:04 AM|
Joined Jul 2007
www.RCadvisor.com - new free model airplane calculator
My new free online calculator (www.RCadvisor.com):
|Jul 09, 2009, 05:45 PM|
Measuring motor power output using a calibrated dummy prop:
Vriendelijke groeten Ron
|Aug 08, 2009, 08:29 PM|
I'm in the process of moving all my "freeware", including MotorXLT2 and TurnCalculator3, to my blog for easier maintenance. Here's the link:
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.
|Oct 15, 2009, 02:38 PM|
Should read "measuring motor power output using a calibrated dummy prop".
|Mar 06, 2010, 09:53 PM|
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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|Discussion||e-flight calculators (compilation), internal link||Ron van Sommeren||Electric Plane Talk||0||Dec 05, 2006 09:25 AM|