Formulas? - RC Groups
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Jul 01, 2002, 02:22 PM
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I'm putting together a little form-based windows calculator to make easy use of common/useful formulas.

So, post your common/useful formulas here and I'll put it in (i'll give you credit if you wish, of course).

It'll mainly focus on e-flight, but similar to ezone, it'll also contain useful stuff on other areas of model flight.

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Jul 01, 2002, 02:29 PM
Hmm, kerosene... :)
NightSwan's Avatar
Don't have the formula handy at the moment, but something to
calculate the CG would be nice...

here's a link :

And maybe the standard Power/Current/Voltage/Resistance thingie? (fill in two of the above, and calculate the other two or something similar) It's just ohms law, but hey, I'm lazy

Jul 01, 2002, 02:31 PM
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oh, V=IR is in there, dont you worry (im lazy too)
Jul 01, 2002, 10:16 PM
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CG formulas will also be going in there.

As well as a basic design param calculator.
Jul 01, 2002, 10:33 PM
Will work for planes
omega blood's Avatar
canard cg would be nice. tired of doing the math.
Jul 02, 2002, 10:40 AM
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Dick Huang's Avatar
I have included a CG calc. program.
Dick Huang
Jul 02, 2002, 11:00 AM
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Yeah, mine wont be console based so it'll be much easier to use (i hope).

I'm doing this because I always find myself looking for formulas, and because im bored
Jul 02, 2002, 11:33 AM
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Fast electric boat calculator

Here is a simple Excel spread sheet that I put together to calculate stuff for fast electric boats. If you click on the answer boxes you can see the formulas. Most of the calculations are also relevant to E.flight.

Jul 02, 2002, 12:05 PM
Registered User
I've got a question on your current draw equation

you use:

3.6/time * mah = current draw

i would use:
Ah = current draw X total time

Whats the 3.6 for? Am i missing something?
Jul 02, 2002, 12:29 PM
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The 3.6 is a conversion factor. 3600 seconds/hour divided 1000 milliAmps/Amp gives 3.6, and cancels out the milliAmp-hour units of the battery capacity. The "time" is in seconds, so that cancels out too. All you're left with is Amps.
Jul 02, 2002, 01:16 PM
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ahh, yeah- guess i was thinking base units.
Jul 02, 2002, 03:12 PM
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I am glad mkirsh1 worked that one out first. I was having trouble remembering how I arrived at 3.6.

Jul 03, 2002, 11:55 AM
Registered User
Alright here is a little beta version of the first module (basic electricity formulas).

If there is a mistake in a formula, or bug, you can post it here.

I am serious about this program possible being unstable, I would save all my work before using it... I haven't tested it enough to make sure it wont crash- so be careful

I'm putting out such a simple version because I want you all to make sure everything works for me after stareing at something for a few hours you would be suprised how easy it is to miss simple mistakes. And there will be mistakes. Mistakes in formulas, actual math, input, output... you get the idea.

Next I will do CG sections (both with canard and without).
Again, post all questions/ comments/ suggestions/ complaints(?) here.

Download from:

(if anyone has webspace that I could use for this, let me know- running apache on my win98 box isn't a very good idea ).


This is just a little collection of calculators to help you remember and use all the
little (sometimes not so little) formulas you find yourself using while
building/testing/flying your electric models.

All bugs / complains / suggestions / compliments may be sent to

NOTE: This software is provided "as is". That means it's free, no support is provided.
also note that this is a beta version, the code should be considered 'unstable'. Save
your work before running any of these programs, as I can't promise they won't crash your
computer (hopefully they wont crash your airplanes). The author of this software holds
no responsibility whatsoever for any damage caused by the use of this software.
Jul 03, 2002, 01:18 PM
Registered User
Dick Huang's Avatar
Got some more formulas for you.
Jul 03, 2002, 01:20 PM
Registered User
yikes... could you provide a list of what the variables are at the top? Sooo many of them this is great, Ill put this stuff in once i figure out what the variables stand for.

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