ORIGINAL: Bonified Wingnut
Hey, Under 4 lbs it will fly. I have a Pheonix models Sonic low wing with a Magnum 30 4 stroke in it. Its a dog but it is fun to fly. It is Over 4 lbs dry or close to it. Its so quiet it's almost like flying electric. I do knife edges and loops with it. Just not Low and not two in a row. That 4 star has to have more wing than my Sonic.
The sonic is on the far right.
Good Luck.
Funny you mention it, but I had bought the high winged Sonic just for that engine. Two issues came up though. Allthough they say you can use standard size servos, mine wouldnt. The airelon servos and control rod hit the other servos. Arghh. [:'(]
The other issue was the covering needed shrinking. Ooop!

I needed room and I eventually tossed the Sonic out.
I bought the OS FS .30 hoping I could easily find a plane for it. The PT .20 I first bought turned out to be a box of twisted heavy lumber which I never finished. The Eaglet 50 ended up weighing 5 lbs and flew like an under powered turd.
However, my new 4*40 came in at 5 lbs even and will go unlimited with a Magnum .52 four stroke and flys like a dream! I can pull this off. Ill do it during building season which is summer here. lol