RE: Few Sig wonder ??
I have had two wonders..the first was built by the book and I used an LA.15 in it. It flew great, used 3004 servos for ele/ail and a hitec micro for the throttle. It had about 30 flights on it when a launching mishap broke of the rear deck. A hasty glue job at the field led to catostrophic failure after a high speed split s. All the electricals were OK so they went in my new kit, powered by a .25fp I have found the plane is not that much faster but climbs and launches much better. I have 6 planes including a GP Shoestring, 1/3 Pitts, Sig Wonder and a 1/5 scale clipped wing cub powered by a saito .60 twin. The wonder is by far the most fun I have flying. I did use angle stock to reinforce the rear deck but no adjustment to the firewall was needed with the bigger engine.