P6.26 A 775 N skydiver reaches a terminal velocity of 240 km/b during free fall. If the frontal area of the diver is 0.750 m², what are: (a) The magnitude of the drag force acting on the skydiver? (b) The drag coefficient?
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- Aerodynamics NACA 747A415, chord is 180 cm 1) What is the location of favorable pressure gradient of the upper surface, measured from LE? 2) What is the location favorable pressure gradient of the upper surface, measured from TE?Air at 20°C and 1 atm flows at 2 m/s past a sharp flat plate.Assuming that Kármán’s parabolic-profile analysis, , is an accurate, estimate (a) the local velocity u and (b)the local shear stress τ at the position (x, y) = (50 cm, 5 mm).Consider the Gulfstream IV flying at Mach = 0.35. Calculate thrust required given an altitude of 30,000-ft, assuming weight of 73,000-lb. Airplane data: S = 950 ft2, AR = 5.92, ??? = 0.015, and K = 0.08 a. The thrust required at 30,000-ft. (in pounds)
- The so-called Rocket Man, Yves Rossy, fl ew across the Alps in2008, wearing a rocket-propelled wing-suit with the followingdata: thrust = 200 lbf, altitude = 8,200 ft, and wingspan = 8 ft(http://en.wikipedia.org/wiki/Yves_Rossy). Further assume awing area of 12 ft2, total weight of 280 lbf, CDq = 0.08 for thewing, and a drag area of 1.7 ft2 for Rocket Man. Estimate themaximum velocity possible for this condition, in mi/h.The main cross-cable between towers of a coastal suspensionbridge is 60 cm in diameter and 90 m long. Estimatethe total drag force on this cable in crosswinds of 50 mi/h.Are these laminar flow conditions?A tractor-trailer truck is coasting freely, with no brakes,down an 8° slope at 1000-m standard altitude. Rollingresistance is 120 N for every m/s of speed. Its frontalarea is 9 m2, and the weight is 65 kN. Estimate the terminalcoasting velocity, in mi/h, for (a) no deflector and(b) a deflector installed.
- The small boat in Fig. P3.48 is driven at a steady speed V 0by a jet of compressed air issuing from a 3-cm-diameterhole at V e = 343 m/s. Jet exit conditions are p e = 1 atm andT e = 30 ° C. Air drag is negligible, and the hull drag is kV0 2 ,where k ≈ 19 N ? s 2 /m 2 . Estimate the boat speed V 0 in m/s.Assume the stabilizer of an airplane is a flat plate. If the transition /critical RN 750,000, what is the skin-friction drag of a rectangular stabilizer having a span of 1.73 m and a chord of 0.81 m at a speed of 44.7 meters per second? Assume standard sea level conditions.-round off to 4 decimal places-show complete solutionWater at 20°C flows at 5 m/s past a 2-m-wide sharp flatthe plate. (a) Estimate the boundary layer thickness at x = 1.2 m.(b) If the total drag (on both sides of the plate) is 310 N,estimate the length of the plate using, for simplicity,.
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