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C of G calculation
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- Posts: 138
- Joined: 20 Mar 2015, 18:26
- Location: Cornwall
C of G calculation
Forgive me, this must have been asked many times before but can anyone direct me to a centre of gravity calculator? I know there are some dodgy ones online. I have a couple of model aerodynamics books but both are unavailable. Thank you!
- Cliff Evans
- Posts: 1033
- Joined: 29 Dec 2019, 15:13
- Location: Bristol
- Contact:
Re: C of G calculation
https://lasercutsailplanes.co.uk
https://patteaklegliders.co.uk
https://patteaklegliders.co.uk
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- Posts: 138
- Joined: 20 Mar 2015, 18:26
- Location: Cornwall
Re: C of G calculation
Thanks Cliff - that looks a lot easier than the tape measure/pencil/paper/calculator stuff I have used before!
- Ian Davis
- Posts: 162
- Joined: 18 Mar 2015, 12:33
- Location: Bishopstoke UK
Re: C of G calculation
Hi Nigel
I used the calc that Cliff references for many years believing it to be fall proof. The results seemed OK over many models.
I discovered https://www.ecalc.ch/cgcal and the differing results between the two calcs was alarming.
There is a problem with the definitions for the neutral point in the Calc that Cliff suggests. I would recommend using ecalc. I've tried and tested it over a large number of gliders with absolute success.
You could always try both and decide for yourself.
Ian
I used the calc that Cliff references for many years believing it to be fall proof. The results seemed OK over many models.
I discovered https://www.ecalc.ch/cgcal and the differing results between the two calcs was alarming.
There is a problem with the definitions for the neutral point in the Calc that Cliff suggests. I would recommend using ecalc. I've tried and tested it over a large number of gliders with absolute success.
You could always try both and decide for yourself.
Ian
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- Posts: 229
- Joined: 20 Mar 2017, 22:09
- Location: UK
Re: C of G calculation
Hi Nigel, in practical terms if you find the MAC of your wing and find a point at 28 to 30 % chord at that position and take the perpendicular line from it to the fuselage you will have a safe C of G to start with. Regards John.
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- Posts: 219
- Joined: 22 Mar 2015, 10:27
- Location: Australia
- Contact:
Re: C of G calculation
the rcplanes calculator I use now for a couple of years and it works for me on scale and other models. For the maiden flight you do not have to worry if the COG will be o.k.or not. You can always make changes later but in my case there are hardly any. for the static margin I use a 10% setting on scale gliders.
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- Posts: 497
- Joined: 18 Mar 2015, 07:52
- Contact:
Re: C of G calculation
I give another vote for ecalc
https://www.ecalc.ch/cgcal
I have used it for many models and have always found it reliable even with multi panel wings and canards.
AEB
https://www.ecalc.ch/cgcal
I have used it for many models and have always found it reliable even with multi panel wings and canards.
AEB
AEB = Aeronautical Energiser Bunny (with thanks to CW)
- RobbieB
- Posts: 547
- Joined: 07 Mar 2015, 22:22
- Location: North West
Re: C of G calculation
The CG calc page seems to have been moved to: https://www.ecalc.ch/cgcalc.php