ORIGINAL: nonstoprc
On model processing at Worlds or Nats, just wonder how the measurement is made.
If the caliper method is used, how does the official make sure that the long bar of the caliper is parallel to the datum line?
In the recent edition of
Model Aviation, an article on the Worlds written by Jim Quinn had a photo with Ron Lockhart manning a standardized 2-meter "bracket" for checking wingspan and length compliance. For the length, seems to me they would measure it with the model in flight attitude, i.e. the zero datum position.