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Nov 02, 2005, 03:27 PM
The Big Kahuna of Foam.
bkahuna's Avatar
Thread OP

Simple motor data calculator

I got tired of trying to remember fomulas and dragging out the calculator. So, I whipped up this quick motor calculator. I have posted it for anyone else that wants to use it. It is written in C# .Net so it requires MS .Net 1.1 Framework to be installed. Runs on Windows 2K/XP.

Note: Although I have not seen any issues, I would still consider it kinda beta, so if you see an issues with it, let me know so I can fix it. Also, a few of these calculations like thrust and Kv will get you close but are only approximations. To measure thrust you really need a trust meter and to measure Kv you need to hook your motor up a drill or another motor to drive it. Prop pitch speed and Delta vs Wye should be accurate.

If you don't have .Net installed, you can download it here...
>> Download .Net Framework <<
Last edited by bkahuna; Nov 02, 2005 at 03:36 PM.
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Nov 02, 2005, 09:42 PM
a little kid at heart
poulsbobill's Avatar
thats pretty cool

thank you
Nov 03, 2005, 05:15 PM
selector's Avatar

bug report

hi ! very good idea !

in version, 1.0.2132.27271 please see the bug when i enter a decimal value in Kv field of the the Kv Tab : if typed decimal separator is a dot, it bugs


PS : it would be very helpful if when clicking on a new button placed on each Tab, the app could display formulas used by current the page ....

PS2 : last tab indicates to us you're a self winder man ;-)
Nov 03, 2005, 05:19 PM
The Big Kahuna of Foam.
bkahuna's Avatar
Thread OP

I'll take a look at it and see if I can come up with a fix.
Nov 03, 2005, 05:36 PM
The Big Kahuna of Foam.
bkahuna's Avatar
Thread OP
I just tried it and was unable to see an error.

I see that you are in France. My guess is that is has to do with regional settings as I see your answer has a comma instead of a period in it.

Nov 04, 2005, 01:16 AM
Paul Williams
Originally Posted by bkahuna
... Also, a few of these calculations like thrust and Kv will get you close but are only approximations....
Firstly, thanks for the great tool...

Secondly, please can you tell me what approximations you have used for the thrust
Nov 04, 2005, 01:48 AM
Permanently Banned
Larry3215's Avatar
Yes - curious about the thrust calcs - they seem to take pitch into account more than other calc tools I have used.

Nifty program tho!

Nov 04, 2005, 01:52 AM
Permanently Banned
Larry3215's Avatar
Here are a couple I use.

Both give higher results for a 12x6 at 5000 rpm, but they dont agree with each other either

Both also ignor pitch.

Nov 22, 2005, 10:33 PM
prop wash
biggy boy's Avatar
Thanks this is exactly what I was looking for.
My question to you is how accurate is this for different styles of props,
such as a slow fly GWS RS as compared to a HD prop?
In Motocalc you use different ceif. numbers for different makes, styles of
props to calculate thrust, rpm and prop speed.


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