# Selected Aircraft: 787-8 DREAMLINER Maximum Takeoff Weight (MTOW) [lbs] : 557,000 LBs Engine Type and Rated Thrust [lbs] :

Please help with the following problems.

Selected Aircraft: 787-8 DREAMLINER

Maximum Takeoff Weight (MTOW) **[lbs]**: 557,000 LBs

Engine Type and Rated Thrust **[lbs]**: 2x Ge Electric genx-1b, 64,000 per engine, total available 128,000 lbf

Take-off distance at MTOW **[ft]**: 2600M (8500ft)

Utilizing the above researched information, derive and present (in an instructional way) approaches and solutions to the following problems:

1.) If your selected aircraft’s takeoff speed at MTOW was assumed to be 150 kts (i.e., the speed that is reached in the above researched takeoff distance), explain how to find and determine:

The total acceleration **a [ft/s2]** during takeoff roll

The sum of retarding forces **FR [lb]** (drag + friction) that was present during takeoff

The time **t [s]** it took for this takeoff

2.) Given the researched knowledge about the aircraft’s thrust, explain for a specific airspeed example how to determine the power **P [HP]**.

3.) For a specific example related to your researched aircraft data, explain how to determine potential**EPot[ft-lb]**, kinetic **EKin [ft-lb]**, and total energy **ETot** **[ft-lb]**.

4.) For a specific example, explain how the minimum required climb angle **AOC [deg]** to clear an obstacle can be calculated from knowledge about the obstacle’s height and its distance from the point of takeoff.