Volcan, don't listen to the power hogs! People will tell you you'll need a 61 size engine on this thing. I read about one guy who was planning to use a 91! I have a Magnum 40 on my Seagull Spacewalker II and it flies just fine.* I can do most basic aerobatic maneuvers. The issue is really how you like to fly. I don't want an overpowered model with an engine that can drag it all over the sky at lightening speeds. I want to have to FLY the thing. With a 40 size engine you will need finesse (just like a real pilot) to fly well. No yanking it off the deck! You'll have to fly out gently. Similarly, to get a really nice loop you may have to start with a bit of a dive to pick up speed -- just like full-size pilots have to do sometimes.

My main interest is in WWI scale not aerobatics, and since most of the WWI planes were underpowered I prefer to practice the flying skills I'll need for my scale models. So don't be intimidated into using a larger engine -- unless you want a racer!

*Well, technically I HAD a Magnum 40 on my SWII until two days ago when I crashed as a result of going deadstick in a brisk crosswind. BTW, the Japanese use the term "ensto" ("ENgine STOp") for "deadstick."

Note, the Seagull SWII is one sturdy ARF! I've crashed mine at least 8 times previously and this last one was the first to put me out of commission for more than a couple of days (tore out the firewall, ripped off the gear and wing mount but no damage to wing or tail feathers). Also it's a bit heavier than you might think for a plane this size so don't expect it to float like a trainer -- particularly in a deadstick! : )

PS. Glad to see you're back in action after your encounter with a prop.