Model Airplane dimensions

Have been finding a bit of inconsistancy is how model airplane overall dimensions are reported.

For wingspan, some cite the actual wing as constructed. Whereas others measure off the flat lengths shown on the plan. This would not be a quibble, but some of the old timers had very big dihedrals and this can easily alter the dimension by and inch or more.

Second, I find the fuselage length figures at variance. Usually it is from the most extreme curve of the rudder forward to ? Sometimes they measure tot eh nose to teh fuselage and other times it is the thrust washer on the engine.

Third, Height is most often at reat to the top of the rudder. However, I have found that on large high wing A/C the wingtips can actually be about the rudder tip.


Which system do you use? The A.M.A. outlines the measurements pretty heavily for rubber powered A/C, but not for powered flight.


Wm.