The BRAtt: Burchett Robert Allan Training Tug

Wednesday, April 28, 2010
Photos by Haig-Brown/Cummins Marine

The BRAtt project evolved from Ron Burchett’s training programs for tug operators using radio-remote controlled scale models. Why not build a model that is large enough for the operator and instructor to ride on and learn in the same space frame of reference as the boat?

The BRAtt is a 25.6 ft by 11.8 ft aluminum-hulled training tug designed by Robert Allan Ltd, with the designer’s distinctive double-chine hull form. Under the counter of the broad stern the hull tucks in quickly providing good water flow over the twin azimuthing drives located aft in the ASD manner. Forward, a relatively deep bow is augmented by a skeg that makes this an escort capable tug. When complete later this spring, the little tug will be able to provide real water training to aspiring assist and docking tug masters without taking an expensive full-size ASD tugs off the job. The boat will be fitted with a fully operational Braden hawser winch forward with the tow line passing through a polished stainless-steel staple.

The propulsion system on the BRAtt is scaled to proportionately represent the full size tugs. It begins with a pair of Cummins QSB5.9-230 HD engines, each delivering 225 hp at 2,600 rpm into engine mounted ZF280.1 gears with 1:1 ratios. To allow for further reduction below the engines 600 rpm idle, the gears have slipping clutches. Flexible Centa torsional couplings are installed between the engines and their gears. Additional flexible couplings are at either end of the drive shafts to reduce vibration and to accommodate any movement in the flexibly mounted engines. The Z-drives are Olympic Model HD3 with 2:1 reduction. The propellers are 25 3/4 inch stainless in stainless nozzles. Both the engines and the Z-drives are mounted with a five-degree angle upward to the stern. The 450 hp twin-engined tug is anticipated to deliver an 8000-pound bollard pull.

Robert Allan Ltd.’s project manager Michael Burgess said, “We have tried to stay all aluminum for the piping and fittings. Where that is not practical, such as the staple on the bow, we have used stainless. The engine is isolated from the aluminum with stainless shims.”

Among the many interesting and innovative features of the BRAtt are the four bollards built to also serve as lifting points for the 16-metric ton vessel. The wheelhouse will be fitted on resilient mounts to provide a lower ambient noise level in the training area. In operation there will be room for at most three people on the boat, but ideally just two. In addition to its training functions, the BRAtt can serve effectively as a real tug, doing smaller towing, docking and line-handling duties, and other harbor tasks such as boom deployment, The BRAtt will be unveiled at the International Tug & Salvage Conference in Vancouver in May.
 

Maritime Reporter February 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Shipbuilding

Shipping Contributes $164bln to EU

The European Community Shipowners' Associations has released the results of a recent update of an Oxford Economics study on the economic value of the EU shipping

UAE Shipping Delegation to Meet with Greek Counterparts

A delegation of Middle East maritime heavyweights including H.E. Khamis Juma Buamim, chairman & group CEO Drydocks World and Maritime World and Rashid Mohammed Al Habsi,

Shipping Industry Faces Shake Up

As global shipping grapples with its worst downturn in 30 years, private equity firms are unwinding massive bets made on the sector in a move set to accelerate

Education/Training

Fiji Maritime Academy Bullish on Prospects

The Fiji Maritime Academy (FMA) is on the right track to become one of the finest maritime training institutions in the region. It has also achieved an important

Vessels for the Future – New R&D Initiative

Looking ahead to 2020 and beyond, both maritime and inland waterways will be under ever increasing pressure, as we use them for transport, recreation and commercially.

“Bright Ideas” program - Ash Center - Harvard University

The Ash Center for Democratic Governance and Innovation at the John F. Kennedy School of Government, Harvard University, recognized the Port of Houston Partners

 
 
Maritime Security Naval Architecture Navigation Offshore Oil Pipelines Pod Propulsion Salvage Ship Electronics Shipbuilding / Vessel Construction Sonar
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1817 sec (6 req/sec)