{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

MEM425F09.HW3

# MEM425F09.HW3 - 3 Consider a propeller driven aircraft with...

This preview shows pages 1–2. Sign up to view the full content.

MEM 425: Aircraft Performance & Design Home work #3 (due 10/13/09) Relevance to Program Outcomes a-k : a, e, k --------------------------------------------------------------------------------------------------------- 1. Consider a 60,000 lb. aircraft, with a wing-area of 1000 ft 2 .: A series of tests were attempted at sea level (density: 0.002377 slug.ft -3 ) to achieve cruise flights. It was observed that with a propulsion system generating a maximum of 4000 lb. thrust, the cruise flight could be maintained only at a velocity of 300 ft.sec -1 . Determine the drag-polar of the aircraft, i.e., determine the parameters C D,0 and K in 2. Prove that the minimum power required to maintain a cruise flight is times that power required in a minimum-thrust flight. i.e.,

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 3. Consider a propeller driven aircraft with the following characteristics: Drag polar: Weight @ beginning of cruise = 2950 lb. Wing area, S = 174 ft 2 Propeller efficiency, η = 0.8 Specific fuel consumption, c = 2.25*10-7 ft-1 It has been determined that the minimum amount of fuel needed to cruise a specified range is 367 lb. As a trade-off study, you have been asked to select a turbojet engine instead of the propeller engine. Determine the upper limit on the sfc (i.e., c t ) the turbojet engine should have to cover at least the same range with the same amount of fuel at sea level (sea level density is 0.002377 slug.ft-3 )...
View Full Document

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern