Hello

This is nothing new to the rc world, but maybe helpful to someone and here is my version of the center of gravity tool.


I think the picture show how it´s done, hehe

It have helped me allot, because in the beginning i had some problems whit the cg and i tried to use the finger tip method whit out luck, But now i can align my Easy Star to fly better.

And here is the Easy Star resting on my center of gravity tool pro!

Views: 2454

Comment by Edson Nobrega on May 19, 2009 at 2:37pm
Dear NorthSweden.
For more that think that your machine is simple, the CG adjustment is very important in time to fly our models. Flying a plane with correct CG adjust can cause serious damage to our equipment.
Comment by NorthSweden on May 19, 2009 at 3:12pm
I just want to point out that my little construction is easy to build, not the CG itself!

Can just say that CG is science by it self,

And i don´t understand your last comment "Flying a plane with correct CG adjust can cause serious damage to our equipment." ?
Comment by Edson Nobrega on May 19, 2009 at 4:52pm
Oh, excuse me for my bad English..
I just wanted to say : "The CG adjustment is very important in time to fly our models. Flying a plane with no correct CG adjust can cause serious damage to our equipment.
I used Google to translate from Portuguese to English.
Comment by NorthSweden on May 20, 2009 at 12:46am
Okey i see, hehe. The google translate is good but some times it fail hehe
Comment by Geetesh Dubey on May 20, 2009 at 11:22am
Well, if remember correctly..one should place the tool tips at about 1/3 the wing width from the leading edge, to balance the COG.

Moderator
Comment by Graham Dyer on May 23, 2009 at 4:58am
COG or more correctly CG (Center of Gravity) should be more or less between 25% and 33% of the MAC (Mean Aerodynamic Chord) of an aircraft - From Wikipedia: To ensure the aircraft is safe to fly, it is critical that the center of mass fall within specified limits. This range varies by aircraft, but as a rule of thumb it is centered about a point one quarter of the way from the wing leading edge to the wing trailing edge (the quarter chord point). If the center of mass is ahead of the forward limit, the aircraft will be less maneuverable, possibly to the point of being unable to rotate for takeoff or flare for landing. If the center of mass is behind the aft limit, the moment arm of the elevator is reduced, which makes it more difficult to recover from a stalled condition. The aircraft will be more maneuverable, but also less stable, and possibly so unstable that it is impossible to fly.

But it does depend on how much sweep the wing has, 1/3rd of wing chord on the wrong plane can put the CG dangerously rearwards making it unflyable. There's lots of info on the 'net about this subject.

Comment

You need to be a member of DIY Drones to add comments!

Join DIY Drones

© 2019   Created by Chris Anderson.   Powered by

Badges  |  Report an Issue  |  Terms of Service