Answer to Question #123306 in Physics for Gian

Question

If animal is 50ft tall with length of 120ft long how heavy will it be with four legs and how big will a wingspan needed? Also how big will the wingspan be for this creature needed to be to carry its weight to fly high in sky? The weight and wings you say 201ft wingspan
I was thinking like a trex can weight 7-9tons being 40-45ft long and height 12-20ft tall I think
You say 2,000lbs.

Answer 1

In the previous version of solution we did not assume that the mass of the creature is 2000 lbs. We assumed that the lifting pressure caused by wings' aerodynamics is p=2000 lb_f/ft², or 2000 pounds of force per square feet of wing's area.

We also assumed that the density of the creature is 67 pounds per cubic feet. We assumed that the creature (which was not specified) can be "replaced" by a parallelepiped 10 ft wide 50 ft tall 120 ft long. Such density (67 lb/ft³) and dimensions (10x50x120=60000 cubic feet) give us mass of 4,020,000 lbs, or 1823 tons.

If we consider a Tyrannosaurus rex, whose mass is 4500-14000 kg, or 9921 to 30865 lbs, we can take a French ATR 42-300 with max payload 16900 kg (37257 lbs) and a wingspan of 80 ft. A T-rex 45 ft long can easily fit the airplane.