Two more units, a backup flight model and an engineering model, were produced.

Humans were easy to work with as pilots and on engineering models.

Similitude is a concept applicable to the testing of engineering models.

This requires an engineering model that includes the geometry, physics, and any quantitative or qualitative data from the real system.

The B-test was a demonstration that the engineering model functioned as specified.

An engineering model is scheduled to be part of a space shuttle mission in 1993, followed by the experiment itself.

The models are not detailed engineering models, but they allow engines to be added easily.

But Soren's specialists had created a simulated engineering model of the ship.

But as has been said, both in western and non-western societies, this engineering interventionist model is very often inappropriate.

In a few limited cases we"can actually try things out in the laboratory or with an engineering model.