• May 23, 2022, 07:34:53 AM

### Author Topic: Projected wing area formula?  (Read 1755 times)

#### Jim Roselle

• Guest
##### Projected wing area formula?
« on: August 23, 2015, 05:22:35 PM »
I need some help from someone who's better at mathematics than me.

Is there a formula I can use to increase the wing area of a model to a specific desired area? For example if I want to increase a models area from say 250 square inches to 350 square inches can I input both those values and come up with a multiplier for the span and chord that will give me the desired area?

I hope this question makes sense.

Jim

#### Brett Buck

• Posts: 12583
##### Re: Projected wing area formula?
« Reply #1 on: August 23, 2015, 07:22:02 PM »
I need some help from someone who's better at mathematics than me.

Is there a formula I can use to increase the wing area of a model to a specific desired area? For example if I want to increase a models area from say 250 square inches to 350 square inches can I input both those values and come up with a multiplier for the span and chord that will give me the desired area?

I hope this question makes sense.

Divide 250 into 350 to get the ratio of areas, then take the square root to get the scaling factor.

350/250 = 1.4
sqrt(1.4) = 1.18  or 18% larger linear dimensions

Multiply all the linear dimensions (chord, span, etc) by 1.18 and your airplane will be 40% bigger in area.

Brett

• Guest