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General control line discussion => Open Forum => Topic started by: Paul Taylor on August 05, 2009, 09:00:00 PM

Title: How do you find the wing area in sq in?
Post by: Paul Taylor on August 05, 2009, 09:00:00 PM

OK --- I am going to try and do some math. n~

How do I find the wing area... and are the flaps included?

Title: Re: How do you find the wing area in sq in?
Post by: Scott Hartford on August 05, 2009, 09:23:14 PM

It's usually printed on the front of the box or on the plans.... LL~





Don't shoot!, Just making a funny...... ;D

Title: Re: How do you find the wing area in sq in?
Post by: Ralph Wenzel (d) on August 05, 2009, 09:34:44 PM

Flaps are included, as is the area masked by the fuselage. For a straight taper wing, add the root and tip chords and multiply by ½ the total span.

For elliptical or semi-elliptical wings, multiply the root chord times the full span x ⅔ (This is not exact, but is an excellent approximation).

Title: Re: How do you find the wing area in sq in?
Post by: Louis Rankin on August 06, 2009, 09:14:23 AM

Paul,

Wing Length (span) measured in inches multiplied by wing width (cord) measured in inches will usually yield an accurate measurment of square inches.

If wing is taperd, as mentioned above, you need to find your Mean Average Cord (MAC) by adding root and tip cord together and then dividing by 2.

For wing loading: Divide wing area in square inches by 144 to obtain square feet.  Then divide weight in ounces by squre feet to obtain wing loading in ounces per square foot.

Example: Typical model of 550 wing area and 44 ounces of weight.  To find sq. ft. 550/144 = 3.8194.  To find wing loading 44/3.8194 = 11.5201

There is much debate over the best target wing loading; however, Jim Lynch has told me many times "Do not build under 10 and do not go over 14 ounces of wing loading.