Free Flight ScaleBy Tom Hallman | maxfliart@hallmanstudio.comEVERY YEAR, a couple of models stand out in Free Flight Scale. This past season, however, there were many. I’m going to focus on biplanes that turned our heads at a few of the major contests, starting with Dave Mitchell’s charming 13-inch wingspan Gloster AS.31 Survey. Designed by master builder Emmanuel Fillon in 1992, the Peanut model features a dual-geared drive powered by a single rubber motor that is located in the long fuselage. Besides requiring a lightweight, yet sturdy, structure, the added challenge was the creation…