Exercise 3: Lift and Airfoils

Paper , Order, or Assignment Requirements

Exercise 3: Lift and Airfoils

The first part of this week’s assignment is to choose and research a reciprocating engine powered (i.e. propeller type) aircraft. You will further use your selected aircraft in subsequent assignments, so be specific and make sure to stay relatively conventional with your choice in order to prevent having trouble finding the required data during your later research. Also, if you find multiple numbers (e.g. for different aircraft series, different configurations, and/or different operating conditions), please pick only one for your further work, but make sure to detail your choice in your answer (i.e. comment on the condition) and stay consistent with that choice throughout subsequent work.

In contrast to formal research for other work in your academic program at ERAU, Wikipedia may be used as a starting point for this assignment. However, DO NOT USE PROPRIETARY OR CLASSIFIED INFORMATION even if you happen to have access in your line of work.

1. Selected Aircraft:

For the following part of your research, you can utilize David Lednicer’s (2010) Incomplete Guide to Airfoil Usage at http://m-selig.ae.illinois.edu/ads/aircraft.html or any other reliable source for research on your aircraft.

2. Main Wing Airfoil (if more than one airfoil is used in the wing design, e.g. different between root and tip, pick the predominant profile and, as always, stay consistent):
Please note also the database designator in the following on-line tool:
Find the appropriate lift curve for your Airfoil from 4. You can utilize any officially published airfoil diagram for your selected airfoil or use the Airfoil Tool at http://airfoiltools.com/search and text search for NACA or other designations, search your aircraft, or use the library links to the left of the screen. Once the proper airfoil is displayed and identified, select the “Airfoil details” link to the right, which will bring up detailed plots for your airfoil similar to the ones in your textbook.
Concentrate for this exercise on the Cl/alpha (coefficient of lift vs angle of attack) plot. Start by de-cluttering the plot and leaving only the curve for the highest Reynolds-number (Re) selected (i.e. remove all checkmarks, except the second to last, and press the “Update plots” tab).
3. From the plot, find the CLmax for your airfoil (Tip: for a numerical breakdown of the plotted curve, you can select the “Details” link and directly read the highest CL value and associated AOA in the table – first two columns):
4. Find the Stall AOA of your airfoil (i.e. the AOA associated with CLmax in 6.):
5. Find the CL value for an AOA of 5° for your selected airfoil:
6. Find the Zero-Lift AOA for your airfoil (again, the numerical table values can be used to more precisely interpolate Zero-Lift AOA, i.e. the AOA value for which CL in the second column becomes exactly 0):
7. Compare your researched airfoil plot to the given NACA 4412 plot in Fig. 4.4. of your text book.
a) How do the two CLmax compare to each other? Describe the differences in airfoil characteristics (i.e. camber & thickness) between your airfoil and the given NACA 4412, and how those differences affect CLmax. (Use your knowledge about airfoil designation together with the airfoil drawings in the on-line tool to make conclusions about characteristics.)

b) How do the two Stall AOA compare to each other? Explain how the differences in airfoil characteristics (i.e. camber & thickness) between your airfoil and the given NACA 4412 affect Stall AOA.

c) How do the two Zero-Lift AOA compare to each other? Evaluate how the differences in airfoil characteristics between your airfoil and the given NACA 4412 affect Zero-Lift AOA.

8. Compare your researched airfoil plot to the given NACA 0012 plot in Fig. 4.4. of your text book.

a) How do the two Zero-Lift AOA compare to each other? Evaluate how the differences in airfoil characteristics between your airfoil and the given NACA 0012 affect Zero-Lift AOA.

b) What is special about the design characteristics of NACA 0012? How and where could this airfoil design type be utilized on your selected aircraft? Describe possible additional uses of such airfoil in aviation.

We are always aiming to provide top quality academic writing services that will surely enable you achieve your desired academic grades. Our support is round the clock!

Type of paper Academic level Subject area
Number of pages Paper urgency Cost per page:
 Total: