Hi, I'm new to the forum and a relative beginner to R/C Airplanes but have a question. I am in the process of building the Global ARF Decathlon 52..Specs as follows:

Wing Span 63"
Wing Area 641 sq inches
Wing loading 20-22 oz per sq ft
Length 45.5 "
Weight RTF 5.75-6.25 lbs

The manual recommends engines of .52-.61 2-stroke or .70-.91 4-stroke. I prefer going with a 4-stroke. In the past I have used exclusively OS FX engines....61 on my Hobbistar Trainer and .46 on my Falcon Ready float plane. I was thinking of the Saito .72 4-stroke for this one but think it might be overkill for this size plane. Any feedback and recommendations on engine and prop size would be appreciated!!!!!!!!!! Thanks in advance.