Hi Will,
It’s a valid question and my answer has changed with my experience and needs. During my testing of the Ranger EX, I had two sets of wings. As I tested various things to get the QuadPlane conversion working, I was having great success flying it as an APM plane and less success flying it as a QuadPlane. The Ranger EX quad wings became cumbersome with the relatively weak wings not meant for the added weight and twisting and the cables needed to help stabilize them. Other folks, like Rollys and Jacques, have had success but they have also modified their wings.
One of my original goals back when I did the smaller Bix3 conversion was to use two sets of wings so that I could go between a plane and a QuadPlane. The mini Talon conversion convinced me there is merit in a dedicated QuadPlane design. Since I enjoyed flying the Ranger EX as a plane and I could take off from a field without tossing it, I decided to move on to other projects.
I searched a while before I landed on the FX-79 two meter wing. The price and dimensions seemed right and I loved the huge bay area. So far, my conversion project has been a great deal of fun. The wing design and strength required no modifications and I will not have to hand-toss it to get airborne.
It may officially be Spring but we still have snow on the ground here in Upstate NY. I have over 20 test flights backed up and the FX-79 is near the top of my list. So, time will soon tell if this conversion is successful.