We are given the engineering challenge of designing a doomsday aircraft to save people from cities. The aircraft need to be able to cruise to any city in the North American continent from west lafayette where Purdue is located. The aircraft must have the capability to land in non-airport locations since airports are destoried.
We have gone through a series of analysis based on the existing design that might possibly work.
BOEING 747 MOTHER SHIP
Since we need to perform cross-continental flights, a large existing jumbo jet would be ideal. however they are unable to land anywhere but the airport, so we have thoughtt about adding a couple of smaller aircraft to land and pickup the people from the ground and return to the mother ship when the people are picked up.
MULTI-ENGINE WING ROTARY AIRCRAFT
This is also a conceptual design by the company Rolls-Royce. They used a huge number of small engines mounted in the wing box to provide thrust and VTOL capability.
THE V-22 TILTROTOR AIRCRAFT
The V-22 Osprey is a conventional helicopter with the long-range, high-speed cruise performance of a turboprop aircraft designed by Boeing in 1980s. One of the biggest missions of this aircraft is quite similar to our mission: to perform transport missions on all terrain including city environments. Since a V-22 satisfies most of our design requirements, we decided to make modifications on the V-22 for this specific mission.
THE VTOL WHEEL OF MISFORTUNE
However, the three concepts we studied all have their problems. The 747 platform is too hard to achieve, multi prop and V-22 are not suitable for long-distance transportation. So we need to find another design
we did found a very interesting design on the wheel of misfortune--- the Dornier Do-31. Which is a mid-sized long-distance passenger aircraft.