BALANCEING A CHIPMONK
12-01-2005, 10:00 AM
#2
RE: BALANCEING A CHIPMONK
It should be in the instructions what the CG is. Once you know that, then its just a matter of measuring back from the LE of the wing on both sides and marking it. I don't use those fancy balancing machines because all I'm looking for is a good starting point to test fly the plane. Everyones flying style is different, 3D flyers like a plane thats a little tail heavy, pattern flyers like a plane that balances right on the CG. If your CG is for example 3", measure back from the LE 3" on both sodes of the wing and mark that spot with a small piece of tape. I like to take two pencels and put the erasers on the spots I marked with tape and left the plane up. Naturally if the plane falls to the nose you want to move your battery pack AFT to get your CG correct and if your plane falls to the tail then you would want to move the battery pack towards the nose. This has worked for me for over 10 years. Hope this helps.
12-01-2005, 11:17 AM
#6
RE: BALANCEING A CHIPMONK
I've talked with people that do balance their low wing planes upside down and they seem to be satisfied with that. I have had low wing, mid wing, and high wing planes and I have never balanced one upside down. I'm not saying that balancing a plane upside down is wrong, I just never saw a need to do it that way. Like I said, your just looking to get the CG in the ball park for the first flight. From there you'll end up setting the CG to your own flying style. The CG that is in your instructions with each kit was set by the people that test fly the plane and in their opinion, thought this would be the right spot. In their eyes this is true, but for someone else maybe not. What I normally do is set the CG as close as I can to the instructions and on the first flight after trimming it out I roll it over inverted to see how it reacts. I like my CG set to where I have to give just a little down elevator to hold the plane on a level flight pattern at about 1/2 throttle or a little more.
12-01-2005, 02:12 PM
#7
Thread Starter
My Feedback: (2)
Join Date: Aug 2002
Location: ballard, WV
Posts: 279
Likes: 0
Received 0 Likes
on
0 Posts
RE: BALANCEING A CHIPMONK
I MEASURED THE WING AT THE FUSE AND TOOK 35 % OF THAT AND I AM ABOUT 41/2 INCHES BACK ON THE WING FROM THE LEADING EDGE IS THIS RIGHT
12-01-2005, 08:55 PM
#9
Senior Member
RE: BALANCEING A CHIPMONK
Yes there is. And the following link will give you a very credible answer that you can work out for yourself and not have to wait around for your answer.
http://www.geistware.com/rcmodeling/cg_super_calc.htm
http://www.geistware.com/rcmodeling/cg_super_calc.htm
12-01-2005, 09:00 PM
#10
Senior Member
RE: BALANCEING A CHIPMONK
BTW,
isn't right.
Although most CG descriptions are for a measurement that is done at the root chord, you actually figure out the percentage deal based on the Mean Aerodynamic Chord, which on a tapered wing isn't the "WING AT THE FUSE" chord. So working with what you've just described isn't actually going to get 'er done.
That website and it's real simple worksheet is really a good thing to have available.
I MEASURED THE WING AT THE FUSE AND TOOK 35 % OF THAT AND I AM ABOUT 41/2 INCHES BACK ON THE WING FROM THE LEADING EDGE IS THIS RIGHT
Although most CG descriptions are for a measurement that is done at the root chord, you actually figure out the percentage deal based on the Mean Aerodynamic Chord, which on a tapered wing isn't the "WING AT THE FUSE" chord. So working with what you've just described isn't actually going to get 'er done.
That website and it's real simple worksheet is really a good thing to have available.
12-03-2005, 11:19 AM
#14
Senior Member
Join Date: Jan 2002
Location: Corona, CA,
Posts: 4,444
Likes: 0
Received 0 Likes
on
0 Posts
RE: BALANCEING A CHIPMONK
ORIGINAL: LesUyeda
In the above case, a .25 sized Golden Manteled Ground Squirrel.
Les
In the above case, a .25 sized Golden Manteled Ground Squirrel.
Les
