Applied Fluid Mechanics: Global Edition
7th Edition
ISBN: 9781292019611
Author: Robert Mott
Publisher: Pearson Higher Education
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Chapter 17, Problem 17.15PP
To determine
Percentage reduction in drag force.
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Calculate Induced Drag please
A truck having projected area of 6.5 m² and travelling at 72 km/h has a total resistance of 1.6 kN. Out of this resistance, 30% is due to rolling, 20% due to surface friction and rest is due to drag. Calculate the coefficient of drag if specific weight of air is 12 N/m^3.
A small, fast boat has a specific resistance ratio of 0.06 (see Table 17.2) and displaces 125 long tons. Compute the total ship resistance and the power required to overcome drag when it is moving at 50 ft/s in seawater at 77°F.
Chapter 17 Solutions
Applied Fluid Mechanics: Global Edition
Ch. 17 - A cylinder 25 mm in diameter is placed...Ch. 17 - As part of an advertising sign on the top of a...Ch. 17 - Determine the terminal velocity (see Section 2.6.4...Ch. 17 - Calculate the moment at the base of a flagpole...Ch. 17 - A pitcher throws a baseball without spin with a...Ch. 17 - A parachute in the form of a hemispherical cup 1.5...Ch. 17 - Calculate the required diameter of a parachute in...Ch. 17 - A ship tows an instrument in the form of a 30...Ch. 17 - A highway sign is being designed to withstand...Ch. 17 - Assuming that a semitrailer behaves as a square...
Ch. 17 - A type of level indicator incorporates four...Ch. 17 - Prob. 17.12PPCh. 17 - A bulk liquid transport truck incorporates a...Ch. 17 - A wing on a race car is supported by two...Ch. 17 - Prob. 17.15PPCh. 17 - The four designs shown in Fig. 17.16 for the cross...Ch. 17 - Prob. 17.17PPCh. 17 - Prob. 17.18PPCh. 17 - An antenna in the shape of a cylindrical rod...Ch. 17 - Prob. 17.20PPCh. 17 - Prob. 17.21PPCh. 17 - Prob. 17.22PPCh. 17 - Assume that curve 2 in Fig. 17.5 is a true...Ch. 17 - Prob. 17.24PPCh. 17 - Prob. 17.25PPCh. 17 - A small, fast boat has a specific resistance ratio...Ch. 17 - Prob. 17.27PPCh. 17 - Assume that Fig. 17.11 shows the performance of...Ch. 17 - Calculate the total drag on an airfoil that has a...Ch. 17 - Prob. 17.30PPCh. 17 - Prob. 17.31PPCh. 17 - Prob. 17.32PPCh. 17 - Prob. 17.33PP
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- Solve Parts A-C and label Them QUESTION: Suppose you buy a 3 x 7-ft sheet of plywood and put it on your roof rack. You drive home at 45 mi/h. Part A - If the board is perfectly aligned with the airflow, how thick is the boundary layer at the end of the board? Part B - Estimate the drag on the sheet of plywood if the boundary layer remains laminar? Part C - Estimate the drag on the sheet of plywood if the boundary layer is turbulent (assume the wood is smooth) and compare the result to that of the laminar boundary layer case. HINT - 3 X 7-ft sheet of plywood and put it on your roof rack. You drive home at 45 mi/h.arrow_forwardCompute for the lift force acting on a wing with an area of 56 sq. ft., velocity of 75 ft/s at an altitude of 5000 ft. Cl of the wing is 0.75. Calculate the drag of a certain wing with an area of 20 sq. meters , velocity of 75 m/s at an altitude of 2000m . Cd of the wing is 0.05. Compute for the drag of a rectangular wing with a chord of 4.5 ft and a span of 16 ft. if the dynamic pressure 80 psi. Cd of the wing is 0.030.arrow_forwardFor the airfoil given, calculate cm,c/4 and xcp/c when α = 3◦.arrow_forward
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- The Antonov An-225 is the heaviest aircraft ever built, with a maximum takeoff weight of 640 metric tonnes. It also has the largest wingspan of any aircraft in operational service. Sea level standard day (sls) conditions for calculations are 15°C; 101.3kPa Rotate speed (Vr) at takeoff (sls): Vr = 154 kts = 1.2×Vmin (1 kt = 0.514 m/s) Cruise Engine Thrust : a) Calculate the lift coefficient for a standard day takeoff b) Calculate the drag coefficient at cruis Fcruise = 0.85 Fmax Engine maximum thrust: Factual,max = Fsls,max×δ θ½ δ = Pactual/Pref; and θ = Tref/Tactualarrow_forwardAn aerospace engineer is designing a hover board for a project demonstration. He/She plans to use a single 3-ft-diameter blade span area for generating lift. The estimated overall weight of hover board system is less than or equal to 5 lbf. (a) Mass flow rate needed (b) Mechanical power that must be supplied to the airstream.arrow_forwardThe wing loading on an airplane is defined as the aircraft weight divided by the wing area. An airplane is cruising with a wing loading of 2500 Pa. The lift coefficient and drag coefficient are 0.30 and 0.06, respectively. Calculate the drag force if the wing planform area is 12 m2. Assume that the air density is unknown and not given.arrow_forward
- discuss various designs of winglets to reduce induced drag.arrow_forwardFairings are attached to the front and back of a cylindrical body to make it look more streamlined. What is the effect of this modification on the (a) friction drag, (b) pressure drag, and (c) total drag? Assume the Reynolds number is high enough so that the flow is turbulent for both cases.arrow_forwardA Mitsubishi A6M Zero which has a wing area of 22.44 square meters with a lift generated of 6,000 N. If the wingspan is 12 meters, Calculate the velocity at minimum thrust required at standard sea level conditions. Assume wing is an elliptical planform and parasite drag is 0.045.arrow_forward
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