Design a subsonic jet transport airplane to satisfy the foll

Design a subsonic jet transport airplane to satisfy the following mission specifications:

Payload: 231 Passengers

Crew: Two pilots and three cabin attendants at 175 lbs each and 30 lbs baggage each

Range: 4250 nm. following by 30 minutes loiter

Altitude: 39,000 ft

Cruise speed: M = 0.80 at 39,000 ft

Climb: Direct climb to 39,000 ft. at maximum take-off weight WTO

Take-off and Landing: FAR 25 fieldlength, 8650 ft. at an altitude of 2000ft and a 98.5° F day. Landing performance at about WL =0.83 WTo

Engines: Two turbofans

Certification base: FAR25

Estimate take-off gross weight, empty weight, and mission fuel weight.

Side note: The To and the L are subscripts. Also an example can be seen on page 55 of Airplane Design Part 1:Preliminary Sizing of Airplanes by Dr.an Roskam. This was a project but my professor decedied to give the class 4 exams instead of projects. But my professor did say that the exams will be similar to this projects that were given.

Solution

The answer of the following questions are as follows

Take off gross weight =242 tons

Empty weight =189 tons

Mission fuel weight =353 tons