Ask Question, Ask an Expert


Ask Other Engineering Expert

Submit your answers to all problems below. Show your working steps in sufficient details.

problem 1: The NACA 4412 airfoil has a mean camber line given by:

2379_NACA 4412 airfoil.jpg

By using thin airfoil theory, compute:

a) Its zero-lift angle of attack.

At the angle of attack of 3o, compute the below:

b) Its lift coefficient.

c) The moment coefficient about its quarter-chord point.

d) The location of its center of pressure (xcp/c) and aerodynamic center (xac/c).

The experimental data for NACA 4412 airfoil are given in the Appendix of this Homework set (from Abbott, I.H., von Doenhoff, A.E., and Stivers, Jr., L.S., “Summary of Airfoil Data,” NACA Report No. 824, 1945).

e) Compare your outcomes from parts a, b, and c above with the NACA 4412 experimental data and express the percentage difference between your outcomes and experiment.

problem 2: A positively cambered airfoil with a zero-lift angle of attack of −3o has a lift slope of 0.1 per degree.

a) Compute the lift coefficient at an angle of attack of 5o.

b) Now the same airfoil is turned upside-down (so it becomes an airfoil with a negative camber). Compute its lift coefficient at the same angle of attack of 5o as in part (a).

c) At what angle of attack should the upside-down airfoil be set to produce the same lift as that when it is right-side-up at a 5o angle of attack?

problem 3: A two-dimensional thin wing was tested in the wind tunnel. The pitching moment coefficient about the leading edge (Cm,LE) at zero-lift was found to be −0.02. At angle of attack of 8 deg, Cl = 0.7, Cd = 0.04 and Cm,LE = −0.2. Find out the location of the aerodynamic center of this wing.

problem 4: Spanwise circulation distribution for a wing of span b in an air flow of density ρ and speed V is parabolic as shown below:

367_spanwise circulation.jpg

a) Compute the downwash induced by this circulation at any position y0 all along the wing span. Compute as well the downwash at the root of the wing.

b) Determine the total lift generated by the wing.

problem 5: A thin spanwise symmetrical wing has an aspect ratio of 10 and straight edges with taper ratio (tip chord/root chord) of 0.8 and root chord of 1 m. This wing doesn’t have geometric or aerodynamic twist and it has symmetrical airfoil profile.

a) find out, by using 4 terms in the expansion, the spanwise efficiency factor, e, and plot its drag polar if its zero-lift drag is 0.01.

b) Find out lift coefficient and induced-drag coefficient of the wing at an angle of attack of 4o.

problem 6: The wing of a light, single-engine general aviation aircraft has an area of 15.8 m2 and a span of 9.6 m. The airfoil of the wing is NACA 65-415, which has a lift slope of 0.1033 per degree and zero-lift angle of attack of −3o. Suppose the span efficiency factor of 0.893.

a) If the wing is to generate 11 kN lift while cruising at 190 km/h at standard sea level, compute the geometric angle of attack that the wing must be set to.

b) Compute as well the induced drag experienced by the wing in that condition.

Other Engineering, Engineering

  • Category:- Other Engineering
  • Reference No.:- M9668

Have any Question? 

Related Questions in Other Engineering

Design and build a counter that can display the sequence

Design and build a counter that can display the sequence assigned to you by the instructor (see table below). Use two J-K flip-flops for the two most significant bits and two D flip-flops for the two least significant bi ...

Part -1chapter 1 - introduction introduce the project

Part -1: CHAPTER 1 - Introduction: Introduce the project problem; define the scope, aim and objectives of the investigations. CHAPTER 2 - Literature Review: Describe the literature/ theory reviewed which are relevant to ...

Assignmentwhy program design is importantanswer the

Assignment Why Program Design is Important? Answer the following questions: 1. What is a program design? 2. Why program design is important? 3. What program design tools are available? Discuss in details by studying at l ...

Experiment specifications1turn on the pump and adjust the

Experiment Specifications: 1. Turn on the pump and adjust the control valve on the hydraulic bench, the exit valve of the flow meter demonstration unit and the bleed valve on the manometer manifold to bleed off all air b ...

Create the single line diagram of a substation having the

Create the single line diagram of a substation having the following equipments using a drawing software. You can use any drawing software available (e.g. Smartdraw, MS Visio, Microstation, AUTOCAD, Edraw etc.). -Incoming ...

Assignmentan embedded system is any electronic system that

Assignment An embedded system is any electronic system that uses a CPU chip but that is not a general-purpose workstation, desktop, or laptop computer. It is a specialized computer system that is part of a larger system ...

Robotics assignment-investigation into the control of an

Robotics Assignment- Investigation into the control of an electric motor using MatLab. An electric motor can be described by  the following two coupled second order differential equations, see the PowerPoint notes for a ...

If you obtain advice from others or use information from

If you obtain advice from others, or use information from any source including the web, these must be acknowledged in your report. Two sample MATLAB codes are provided at the end of the assignment to help you with this a ...

1 estimate the cycle time and production of a caterpillar

1. Estimate the cycle time and production of a Caterpillar 777D flat floor off highway truck operating on a level haul road of 4000m length. The road is a rutted dirt roadway with no maintenance and no stabilisation, tyr ...

1 explain the process to convert an analog signal to a

1. Explain the process to convert an analog signal to a digital one. >it done by recording and taking samples of the analogy signals to be digital, the more samples taken within a specific time frame the higher the quali ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro