Aerospace – Military

A military aircraft design often has to satisfy more demanding requirements than a civil aircraft, placing greater reliance on analysis.

For example, military transporters may have to land and refuel at remote and poorly serviced landing strips, where availability of fuel may be an issue. Therefore, the engines and engine feed system must be designed to cope with a much wider range of fuel types than a civil aircraft would. Analysis can ensure that the fuel system design meets the requirements over the full range of operational conditions.

Not only is fuel type a possible issue, but the actual top-level requirements of a military aircraft are more demanding. The ability to receive fuel in the air or even to dispense fuel to another aircraft mid-flight introduces an additional complex sub-system, requiring analysis as part of the design.

The anhedral wing, typically found on military transporters, presents fuel tank venting challenges even during level flight. The venting system must be designed to allow tank pressure equalization to external ambient pressure, with vent flow through the surge tanks, typically found at the tips of the wing.

Another example is the fuel system in a fighter jet, which has to deal with much more adverse in-flight aircraft attitudes, including negative-g conditions and possibly inverted flight. The fuel system has to be able to cope with this and more.

Consequently, analysis plays a significant part in any aircraft design in the systems outlined above and many more. MMI engineering has a team of dedicated engineers and analysis tools to meet these design challenges.