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Design of Aircraft

Thomas C. Corke

Chapter 2

Preliminary Estimate of Take-Off Weight - all with Video Answers

Educators

Chapter Questions

Problem 1

In the spreadsheet, keeping everything else fixed, make a plot of how the take-off weight changes with the following parameters:
1. range;
2. aspect ratio;
3. payload;
4. endurance;
5. cruise altitude;
6. cruise Mach number.
Discuss the trends, citing the underlying theory.

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16:00

Problem 2

In the spreadsheet, for the given case study, what is the largest structure factor possible?

Paul A.
Paul A.
California State Polytechnic University, Pomona
07:09

Problem 3

Consider a jet-powered combat aircraft with the following characteristics:
1. cruise Mach number $=2.1$;
2. max. Mach number $=1.9$;
3. cruise alt. $=60,000 \mathrm{ft}$;
4. oper. rad. $=300 \mathrm{~nm}$;
5. engine $\operatorname{TSFC}(\min / \max )=0.8 / 1.8$;
6. thrust $=22,000 \mathrm{lbs}$;
7. aspect ratio $=2.4$;
8. combat time $=8 \mathrm{~min}$;
9. combat alt. $=20,000 \mathrm{ft}$;
10. loiter time $=20 \mathrm{~min}$;
11. loiter altitude $=10,000 \mathrm{ft}$;
12. structure factor $=0.5$;
13. exp. payload $=0 \mathrm{lbs}$;
14. nonexp. payload $=600 \mathrm{lbs}$.
Determine the final take-off weight. How is this changed if the expendable payload is $500 \mathrm{lbs} ?$

Vipender Yadav
Vipender Yadav
Numerade Educator

Problem 4

For the conditions of Problem 2.3, make a plot of how the take-off weight changes with the following parameters:
1. range;
2. combat time;
3. combat altitude;
4. thrust;
5. expendable payload;
6. structure factor;
7. maximum Mach number.
Discuss the trends, citing the underlying theory.

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01:06

Problem 5

Input the conditions for a Boeing 747 aircraft into the spreadsheet. Most of these can be found in "Jane's All the World Aircraft." Others can be estimated from figures and tables in the textbook. How does the maximum range for this aircraft compare to that of the combat aircraft in Problem 2.3 or the supersonic business jet in the case study? What are the controlling characteristics that determine the maximum range?

Heather Zimmers
Heather Zimmers
Numerade Educator