Techna;

First step up to a 60 size plane. If you have mastered the 40 size trainer, go to something bigger. The Sig 4* comes in a 60 size and is a quality plane and enjoyable to fly. Another plane that you would like is the Sig Astro Hog. It can be made into a trike or tail dragger, is a 60 size, and has grat aerobatic characteristcs yet is easy to fly. It has an excellent reputaion as the second plane to build for someone new to the hobby. If you like it, then, you can step up to the Astro Hog biplane which is a great third plane.