MEM425F10.HW3

# MEM425F10.HW3 - 3 Consider a propeller driven aircraft with...

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

Home work #3 (due 10/12/10) 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

## This note was uploaded on 04/26/2011 for the course MEM 425 taught by Professor Yousuff during the Spring '08 term at Drexel.

### Page1 / 2

MEM425F10.HW3 - 3 Consider a propeller driven aircraft with...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online