When backpacking equipment into the forest, crosscut saws require less weight to be carried in on people's backs.

Whatever required too much gravity and weight, we had to find another way to express that in swim," explains Lignini.

Except in unusual conditions, shad stay fairly deep, requiring weight on the line or fly.

However, this requires additional weight in engines, fuel and landing gear, negating some of the static lift capacity.

"It's not for everyone because it requires good balance and weight shifting," he said.

Internal combustion engines can also get extremely hot, which may require additional weight from cooling systems or heat shielding.

But for Macintosh users who require color and light weight, the Duo 270c is the best choice.

A compromise was therefore necessary between loudspeaker efficiency, which required the strongest possible magnet, and weight.

Aircraft machine guns required light weight, firepower, and reliability, and achieving all three goals proved a difficult challenge.

However, this extra hitting power required extra weight.