Model Railroad Concepts and Design With CAD. Todd Arnett Plumbing Systems Designer 35,500 Hours Seat Time Using AutoCad . What is CAD?. CAD is an acronym for Computer Aided Design. Also know as CADD: Computer Aided Drafting and Design.
Plumbing Systems Designer
35,500 Hours Seat Time Using
Here’s a question that I seen on a message board:
“What is a 1.5% grade in HO scale?”
Why? Grade percentage is defined as rise in elevation over a distance of 100 feet. Therefore, grade percentage is the same regardless if it’s prototype, HO scale, N scale, etc.
A smooth parabolic curve in the vertical plane used to connect two grades of different slope to avoid an abrupt transition in passing from one to the other.