1) Show that the Drag equation is homogenous in both SI units and basic units. 1 FD CD Apv²
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Show that the drag equation is homogenous in both SI units and basic units
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- q: An aircraft is flying straight and level at a certain altitude with a velocity of 214 fps. Determine the power required if the wing area is 115 ft? and the total drag coefficient is 0.067. Assume SSLC (p=0.002377 slug/ft3). Provide answer in ft-Ib/s. and round off to the nearest whole number. Solve using standard English units.A propeller-driven aircraft has an in-flight weight of 4,105 lb (equivalent to a mass of 1,862 kg) and is cruising at a true airspeed of 120 kts. The lift-to-drag ratio of the aircraft is 8.2. If the propeller efficiency, ηp, is 0.8, then how much brake power is required for flight? Work through this problem in both USC and SI units.2. A 0.10 cm-radius sphere falling in air (T= 20°C) at a speed of 25 m/s. Determine the following: a) Skin drag force b) Form drag force c) Total drag force. 3. The raindrops of around 3 mm diameter fallat 5 mis, while drizzle with droplets of 0.3 mm diameter falls at 1.5 m's. what is the terminal velocity of such raindrops and terminal velocity of the drizzle?
- Given the following measurements of mean winds and temperature from a 200-m mast inNetherlands on a September night: Table 1. Measurements of mean winds and temperature from a 200-m mast in Netherlands ona September night. Question: Solve for the roughness parameter (zo) and friction velocity (U*)1. The given information is as follows: Cd=1.4 (coefficient of drag) ¥=10 ft/sec (velocity) Ƴ=62.4 #/ft3 g=32.3 ft/sec2 a. What is the water pressure in PSF against the obstruction? b. If the pier is 6 ft wide and 14 ft deep, what is the Resultant Pressure on the WHOLE obstruction? c. If the obstruction is fixed into the bottom of the river (mud line), what is the bending moment at the mudline on the obstruction?Q1/ Boeing 737 - 60 flies at altitude 15000m above sea level with speed 85 m/s and total drag coefficient equal to ( 5) . Find the drag force at this fly condition. Given data IR=287,g=9.81 m/s2 , rho O=0.3648 kg/m2 and wing area = 120m^ ^ 2^ *
- The drag equation for the Gofaster 172 is: D = 0.0003v2A. D is drag in pounds; v is airspeed in feet/second; and A is aircraft frontal area in square feet. At maximum airspeed, D = 140 lbs. How much does max airspeed INCREASE if the fuselage is narrowed such that frontal area A is reduced from 16 ft2 to 14 ft2? Give the answer in ft/sec AND mph. drag is 140 lbs. at maximum airspeed, regardless of frontal area. the question is: what is the INCREASE in max airspeed, not what is the max airspeed.. The net drag of a moving body is produced by both pressure and shear stress effects. In most instance these two effects are considered together and an overall drag coefficient CD, defined as CD = D/(1/2 rU2A)。The drag coefficient depend on what physical effects or dimensionless numberA C-130 pilot desires to fly a low-level navigation mission at 4 n miles/ min (240 kn ground speed).Winds are forecast out of the north (blowing south) at 20 kn, the pressure altitude is 10,000 ft, andthe temperature is 80 °F. What indicated airspeed should the pilot fly on a northbound leg if theposition error is negligible? The answer is q = 136 lb/ft2
- One dimension of a rectangular flat plate is twice the other. Air at uniform speed flows parallel to the plate, and a laminar boundary layer forms on both sides of the plate. Which orientation—long dimension parallel to the wind (Fig. a or short dimension parallel to the wind (Figb —has the higher drag? Explain.3.) Automotive engineers work very hard to improve the value of the drag coefficient for cars. Suppose you have a car with a mass of 3000. kg and an effective surface area of 4.00 m^2. The engine can generate a maximum force of 28,000. N. Let the coefficient of kinetic friction be 0.200, and the coefficient of static friction be 0.400. Air has a density of 1.21 kg/m^3. (back on earth) (3a) Draw a free-body diagram for your car, including both drag and friction, when the car is moving at its maximum velocity. (3b) If the maximum value of your car's velocity is 150.0 m/s, then what is the drag coefficient for the car? (3c) Suppose your engineers change the drag coefficient to 0.300 - what would be your maximum velocity then with the same force from your engine.A vertical air stream flowing at a velocity of 100 m/s supports a ball of 60 mm in diameter. Taking the density of air as 1.2 kg/m³ and kinematic viscosity as 1.6 stokes, the weight of the ball that is supported is (if coefficient of drag C= 0.8)