Doc, I'm not sure. But there's quite a bit of wing. I had already gotten Chris to OK my upgrade from a 50-size engine to a Saito 72. I actually do have a Saito 82 sitting around which has the same exterior size as the 72. But I'm not sure I need more power. It flies, and seemingly flies well, a full throttle.

*****

I just checked on the area. The span is 63" and the chord is a bit over 10 inches. So that 630 x 2 = 1,260 square inches of wing...perhaps a bit less since the upper wing center section is smaller and has a gap. BTW, I never know if you've suppose to include the fuse gap on the lower wing in these calculations. I would assume not. So let's knock that down to maybe 1,200 square inches.

Using the calculation method given on this page that yields a wing loading about 18.6oz per square foot.

http://www.airfieldmodels.com/inform...ng_loading.htm