Measurement of CofG

On Jan 11, 8:06*am, Tony wrote:
On Jan 11, 9:10*am, Artiom M wrote:









Many thanks for answers guys!
Finally I understand how to do that.
It seem to me the best idea is to cut a board and use a bubble level.
Sounds great and easy to do! Thanks Paul!

BR.
Artiom.

p.s. One more question... As English is not my native language can you
describe in other words what “boom” means? As I understand this is a
Pipe (part of fuselage from end of the wings to tail)? Am I right?

On 11 Sau, 15:09, "Paul Remde" wrote:

Hi Artiom,

Good question. *It is a ratio. *For every 100 units (inches, mm, whatever)
of horizontal travel, it should go down 3.67 (of the same units).

I recommend cutting a board that is 100 cm on one side and 3.67 cm on the
other side. *It should be a triangle shape. *Then lay it on the tail in the
correct location and use a bubble level on top of it to level the fuselage.
The pointy end should be pointed toward the front of the glider.

Another option (which is not as precise) use a long yardstick with a bubble
level built-in. *Measure how long it is (let's assume it is 36" long) and
use the ratio to calculate how high the back end should be lifted up off the
tail. *36" x 3.67/100 = 1.3212". *You could tape something to the end of it
to get it to sit on the tail at the correct height.

Does that make sense?

Good Soaring,

Paul Remde

"Artiom M" wrote in message

....
Hi all,
I’m trying to understand how to determine CofG of my DG-100. In the
maintenance manual there is such sentence which I do not understand:
“The fuselage must be leveled so that the top of the aft fuselage boom
has a tail-down slope of l00 : 3.67.“
I understood that I need to lift up the sailplane tail, but what does
100:3.67 means? To what height? Can you help me with that?

BR,
Artiom.

yes you are correct

Don't forget to consider using the Program SeeG to help you with
Weight and balance calculations (shameless plug). You can find out
more at www.glideplan.com

Cheers,

Matt