Towing Carriages and Gantries
Towing carriages are mounted on rails above the tank and are used to pull models through the water. On larger tanks these can be ride-on carriages where the experimenters can work on the carriage as the experiment takes place. Narrower towing tanks are typically fitted with small carriages that the model can be attached to.
ED have developed a system for a facility in Bergen where both rails are cantilevered from the wall of the tank. This design provides extremely good access and visibility of the model. The carriage is capable of 5 m/s. ED have installed similar carriages at a facility in Egypt, Cranfield University and at Hochschule Emden/Leer.
ED have built a 55m X-Y plotter towing carriage for the NUS DOBS basin in Singapore. This carriage runs on machined rails on custom chairplates. The main carriage can travel ant 2 m/s while the sub-carriage has a maximum speed of 4 m/s.