Originally Posted by
Sport_Pilot
From the interpretation.
So flight testing is furtherance of a business and incidental to the business. Getting an award for winning a contest, especially if done professionally would make it illegal, as wll as getting money and products from sponsors!
You are quite correct, there is a difference between amateur and professional competition. Tell me, how do you become a professional model airplane competitor? Is it like professional golf? Do they have a cable channel for it?