[agere_contra]

This means that even the theoretically best vehicle concept, if flown rarely, will be unaffordable to fly. A mediocre design, flown often, will beat it in cost per flight.

The key thing I took away from this article

[RJR_fan]

This means that even the theoretically best vehicle concept, if flown rarely, will be unaffordable to fly. A mediocre design, flown often, will beat it in cost per flight.

The Soyuz, a hollow steel sphere thicker on one side, is a design that's worked for more than half a century.