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This type of structure is called isogrid structure. Solid walls are usually very heavy and therefore engineers use more weight-efficient structures such as sandwich structures or stiffened structures with stringers and frames. A downside is the huge manufacturing cost compared to other options. As you can see from NASA Report CR-124075 "Isogrid Design ...


27

This is simply a way to achieve required rigidity/strength and vibration dampening with less material than in a solid, even thickness design. Varying the weave pattern gives a relatively easy and a very efficient way to model and produce varying properties to different sections, without having to change the "base" structure thickness. Successfully ...


21

The forward location has two benefits: Wing upwash is smaller, so the flow direction at the intake varies less with speed and altitude. This makes the intake more efficient and requires less robustness in its layout. The forward location shifts the wing's center of gravity forward and gives it better flutter damping. How that works is explained here. Wing ...


8

Almost all jet engines will have one or more "resonance" conditions where the combination of turbine RPM, mechanical elasticity and aeroelasticity constructively reinforces to cause mechanical or aerodynamic vibration. Think of it this way: If you have a slinky spring (mechanically elastic) toy you can hold it by one end and let the rest drop ...


1

Normally, what is throttled back is the afterburner. The principle of reheating an already hot gas is so inefficient that partial wet thrust is achieved by running the engine at full power and using less than full afterburner. The efficiency of the afterburner is proportional to the ratio of gas temperatures (peak to entry temperature), but at partial jet ...


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