Floor plan of a gun pontoon

Title Leupe: Plan van de Canoneerboot met zyn riemen enz.

This draft is part of a series of ‘plans of obstruction’ made after 1780 (see VEL2020-2027). Important to this obstruction were designs for cannonboats or 'canoniere' which moved by sails or oars to hinder hostile vessels. The shallow draught of the boats were an advantage over most other ships when tide was low. Nonetheless, the balance between maneuverability and a shallow draught was difficult to maintain. The armament in this design seems far too heavy, also in the literal sense, for the light, unstable pontoon craft with a low freeboard and shallow draught, even if they would be considerably ballasted. The relatively thin sides would have offered the cannoneers no protection at all, and apparently the pontoons were unable to sail under their own power.

The cartographic style allows for an almost certain attribution to Johann Friedrich Ferdinand Wollant. This design for an oared gunboat with the deck plans, would seem to have been intended as a smaller and simpler version of the sailed variant on sheet VEL2024 and 2025. It carried only one medium-calibre cannon, probably a 12

or 18-pounder, mounted in the bow directly above the keel.

Scale-bar of 20 Amsterdam feet = [approximately 1 : 33].