Wing sails offer a different design challenge to those of more conventional soft sail rigs. This study was undertaken in order to assess which parameters influence wingsail performance of C-Class catamarans, and to what extent, the results from the wind tunnel can be applied in the design developments of future wingsails. A combined wing sail and Cclass catamaran was tested in the low-speed sec...

Spacecraft accelerate by directing propellant in the opposite direction. In the traditional approach, the propellant is carried onboard in the form of material fuel. This approach has the drawback of being limited in Delta v by the amount of fuel launched with the craft, a limit that does not scale well to high Delta v due to the massive nature of the fuel. Directed energy photon propulsion sol...

The International Moth dinghy is a 3.355m long single handed, una-rigged monohull dinghy. The class rules allow the use of hydrofoil that in certain wind conditions can significantly reduce resistance. A new velocity prediction program (VPP) has been developed to evaluate the impact of hydrofoil design and set-up on the performance of a Moth dinghy by simulating racing on a windward leeward cou...

Wind-assisted propulsion (WASP) is one of the most promising ship alternatives that radically reduce greenhouse gas emissions and are available today. Using example a RoPax ferry, this study presents performance potential WASP systems under realistic weather conditions. Different design system layouts discussed. Further, uncertainties in prediction analyzed. Included analysis sail forces as wel...

An Abaqus/Standard FEA based study was carried out to develop a structural format for a wing sail used on a sailing boat, V-39 Albatross. As well as providing a novel structural solution to meet a challenging set of requirements, the study has given the necessary mass properties and stiffness data required to further progress the preliminary design phase of the overall boat. The brief for the b...

lent, considered by many to be one of the best sailing areas in the country, provided an opportunity not to be missed. Although my initial trip out was in a yacht, most of my early experience was in dinghies less expensive to buy and to repair if damaged. The first dinghy I shared was with three other equally inexperienced friends. We bought a 14 foot fibre glass family dinghy through Exchange ...

poetry writing has been characterized by spontaneity and intuition, but this spontaneity was neither pure nor innocent, for the poet had to carefully scheme his poetry, urged by his aspiration to be as elevated as his diction and craft could be, together with the competitive spirit which naturally reigns over poetic genius. the poet, thus, had to pursue means which could allow him achieve maste...

Crucial interaction: EUect of position weaker for items from Class I (.42) than Class II (1.02), t = 2.72, p < 0.05; while this diUerence between a/b conditions not signiVcant, c was rated worse than every other condition. Issue: DAS cannot be uniformly paraphrased as elided RRCs, cf. B. Schwarz (2005); Blöhdorn (2009). (6) The captain sailed every passage possible | navigable a. it was possibl...