ORIGINAL: Siefring
How about this. The BalsaUSA 1/3 Cub is designed for a 2.0 to 4.0 2-stroke with a 3051 in^2 wing area weighing 30 to 35 lbs. A wing loading of 40 to 46 oz/ft^2. Make it 30% lighter it should fly fine with a 1.5. We know how a Cub flies and we should have a pretty good guess how a Cub 30% lighter should fly.
30% lighter ==> 21 to 24 lbs ==> 28 to 32 oz/ft^2. Does that sound like the flight characteristic you want for your Super-Giganto Gonzo, if yes then try 3000 in^2 and a target weight of 21 lbs.
I figure a Super Duper Greatest Gonzo with a 10' wing should weigh no more than 12 lbs. Let's see....
8 oz. / sq. ft. = target wing loading
12 x 16 =192 oz
192 / square feet = 8
24 square feet (3456 square inches)
aspect ratio of 5.8 / 1
s/c = 5.8
s x c = 3456
c = 3456 / s
s / (3456 / s) = 5.8
s ^ 2 / 3456 = 5.8
s ^ 2 = 20,000
s = 141 inch span.
c = 24
actual area = 3384
OK, I can't build that at 12 lbs probably so I guess I'll have to settle for a higher wing loading.
