Mopzilla

I'm in the process of doing the 3-views for my '05 entry. I'm looking at a 24-28" fuselage length and a 29-34 inch wing, with a flat-bottom airfoil. I'm hoping to have a good flier, medium speed, and one that can really slow down for a beautiful landing. The engine is going to be .061. What is the range of wing area that I should shoot for?


Tony

av8rsodt

My Feedback: (23)

Tony,

Do you have an idea what your target weight will be?

If you have a target weight then all you need is wing loading to calculate the wing area:

Wing Area = [MW / WL] x 144

Where:

Wing Area = in2 (square inches)
Model Weight (MW) = oz (with fuel in tank)
Wing Loading (WL) = oz / ft2 (square feet)

A lower wing loading (4-6) is more like a glider where a higher one is more like pattern planes (20-25). I would probably choose a wing loading around 8-12 oz / ft2 for Mopzilla. Maybe someone else can chime in a more exact wing loading number for an .061.

Brian

BMatthews

For slow flying speeds and that soft landing at that size the loading should be no more than 9 oz/sq foot. 7 to 8 would be better. It's that old scaling factor or Reynolds number thing at work again. A 6 oz loading for a 2 meter glider is feather float territory but for a 25 inch span model it's getting close to the heavy sport model region. For your lower wingspan limit I'd say 6 to 8 oz/sq ft is best but for the 34 inch span you can get away with up to 9 to 10 quite well. It COULD fly with up to 11 or 12 but then the landing speed would be higher.

A 34 inch wing with a 7 inch chord would give you 34 x 7 = 238 sq inches which is 238 / 144 = 1.65 sq feet. 1.65 sq ft x 9 oz/sq ft = 15'ish oz. I know from my other models that such a model would have nice low speed charactaristics. Not a floater by any means but it'll have a nice easy to handle glide speed.