The Test Facilities

The Test Facilities

The towing tank is used to determine and investigate the hydrodynamic performance of ships and marine structures.

The tank is equipped with a carriage for testing up to 15 m/s for traditional calm water tests and it is also used for seakeeping tests and other tests performed with free-running models.

It includes resistance, propulsion, seakeeping in head and following seas, and directional stability tests with free running models.

Our Equipment

The test carriage is a manned high speed carriage and is used for traditional calm water tests and seakeeping tests. The towing post can be moved forward or aft depending on the model to be tested.

Servocontrolled wavemaker for generating regular waves and irregular wave spectra.

Regular Waves periods from 0.5s and up

Measurement of model displacement in 6 degrees of freedom.

Irregular wave spectra
ITTC, JONSWAP, Pierson–Moskowitz 

Max Waveheight 0.9m

High end data capture and logging system.

Test models

The models to be tested in the hydrodynamic laboratory at Stadt Towing Tank are manufactured at our neighboring company Easy Form AS.

Hull model production are done with high accuracy and use of skilled experienced people. Two milling machines ensures quick model production and model adjustments if required.

The machines has the following measures

  • L = 26m, B = 7.5m, H = 4.5m
  • L = 12m, B = 3.8m, H = 3.0m

Propeller and propulsion system parts are machined in 5/6 axis machining center. Model details can be machined in lighter materials or 3D-printed.

The basis for a good test model is a high quality 3D drawing. We can import most 3D CAD formats.

Special test models have been made by vacuum forming when specific strength/geometry consideration has been required.

Ship models are made from the best suited material. Normally a combination of glassfiber and milling paste.

Carbon fiber cast models are made for high speed light crafts where model dead weight is low.

The Laboratory

Innovation is the key for surviving in a competitive branch as the marine. New ideas and new concepts are the basis for innovation and starts with a thorough insight into the problems and challenges of daily life.

This has given us innovative motion compensation systems to improve operability in waves and new propulsion systems to improve energy efficiency.

The test laboratory of Stadt Towing Tank consists of a large water basin and the equipment needed to perform the experimental tests needed for bringing new ideas and concepts a step forward to be put into action in the real world.

A 185m long towing tank to experimentally determine the efficiency of the ship hull.  A servo control wavemaker to generate realistic seastates for the checking sea keeping capability.

15m/s carriage speed for testing high speed vessels. 3m/s2 acceleration  for maximizing the steady speed time for making high quality measurements.