For sufficient traction, the tractor must be heavy, and most models can have extra ballast added.

Traction is enhanced in certain conditions without need for extra ballast.

In normal cases, the heel remains as extra ballast begins to decrease forward drive.

As for my boat, it could not have been kept afloat but for the extra ballast.

Today was supposed to be an endurance test, to see how long the balloon could stay up with extra ballast and fuel in place of a second man.

Have to put on some extra ballast, yes.

Trimmed to nearly neutral buoyancy as far as circumstances allowed, with very little extra ballast and moving slowly, U 333 glided over the ocean floor.

Under normal circumstances, investors would look to add to their bond holdings for extra ballast.

Once, they descended low enough to trail a hose in the sea and pumped up water for extra ballast.