John, Jim Archer called it vanessa after his ex wife. It depicts the hate/love relationship he had with the device. It is very accurate, even when the plane is not exctly level. By twisting the dowel you can even determine the vertical CG location. The plomb will always be the line on which the CG is positioned, regardless of plane attitude.
ORIGINAL: captinjohn
If you read the old thread on this device...you will understand how it works. I will post a photo when i get time to take one & post it here. A line level can be used to check for airplane being close to level. Capt,n<hr />
http://www.rcuniverse.com/forum/m_70.../tm.htm#708060