A water rudder is fitted at the rear of the boat hull.

At the extreme rear was a water rudder.

There were also small wheels set inside the water rudders, and a tail-wheel under the fin.

These were long, single stepped and fitted with water rudders, built by Short Brothers.

A water rudder can be lowered from the back of the hull for steering on the surface.

The floats were long, with marked chine and two steps, the second close to the tip where there was also a water rudder.

The water rudder on the float was reinforced to act as a small tailskid for use on land.

An optional water rudder is controlled by foot pedals.

The L-4 has a conventional undercarriage for land use, all three wheels and the water rudder being retractable.

The twin water rudders are connected to the nose-wheel steering mechanism.