Enhanced Fuel Efficiency by Frictional Drag Reduction of Toy Boat Coated with Superhydrophobic Additives comprising Nickel Stearate and AlNiCo Nanoparticles

Surface frictional drag developed by marine vessels utilizes a considerable percentage of fuel for propulsion. Superhydrophobic (SH) surface normally traps a layer of air at the interface and significantly reduces the surface frictional drag. Herein, the efficacy of the SH coating towards the surface drag reduction of the sailing boat is recognized by conducting a facile experiment where the bottom of the toy boat is coated with SH additives. AlNiCo nanoparticles and nickel stearate prepared by ball-milling and co-precipitation methods respectively are drop-casted layer by layer over the surface of the toy boat to impart SH. The fuel efficiency of the SH boat is improved by 51.49% substantiating the reduction in surface drag of the vessel. Further, the trapped air provides extra buoyancy force, enhancing the load-bearing capability of the SH boat by 5.77%.

Dynamic Stability Analysis of a Hydrofoiling Sailing Boat using CFD

This paper describes the study of the dynamic stability of a hydrofoiling sailing boat called the “Goodall Design Foiling Viper”. The goal of Goodall Design is to make hydrofoiling accessible to a wider public, whereas it was previously reserved for professional sailors at the highest level of the sport. To allow for safe operation, stability is an essential characteristic of the boat. The aim of this work is to find a strategy to perform a dynamic stability analysis using computational fluid dynamics (CFD), which can be used in a preliminary design stage. This paper starts by establishing a theoretical framework to perform the dynamic stability analysis. A stability analysis has to be performed around an equilibrium state which depends on operating parameters such as speed, centre of gravity, etc. . A fluid-structure interaction strategy is applied to determine these equilibrium states. The last part discusses the stability characteristics of the Viper. The framework managed to assess the dynamic stability of the Viper and found 5 longitudinal eigenmodes: two complex conjugated pairs of eigenvalues and one real eigenvalue. It can be concluded that the boat was both statically and dynamically stable.

Khazanah Leksikon Tradisi Penangkapan Ikan Paus dalam Novel Suara Samudra Karya Maria Matildis Banda: Kajian Ekolinguistik

This paper aims to find and analyze the forms and categories lexicon of the whale chathing tradition in the Suara Samudra novel by Maria Matildis Banda. To realize this, the library method and scrutinize method were applied in the data collection assisted with notes technical. And then, the data analyzed with qualitative description method and ecolinguistics theory. Then, the result showed with informal and formal method. The result showed that forms and categories lexicon of the whale chathing tradition in the Suara Samudra novel by Maria Matildis Banda writed with lexicon of Lamalera language. That the lexicon consist (1) biotic lexicon, like koteklema ‘whale’, lamafa ‘stab fisherman of whale’, and matros ‘paddle fisherman of boat’; and (2) abiotic lexicon, like peledang ‘boat’, kerakki ‘special chair of stab fisherman of whale in the boat’, and blettu ‘traditional hat from palm leaves’. The form of lexicon consist (1) singular form, like buri ‘trumpet from skin of shell’ and kela ‘place of ball of twine yarn’; (2) complex form, like lama uri ‘special fisherman for drive boat’ and tena laja ‘sailing boat’. The cathegory of lexicon consist noun and noun phrase.

படகுமூலம் புலம்பெயர்வோரின் பயண அனுபவமும் வாழ்வும்

Sri Lankan Tamil’s diaspora’s experience are different. which has appeared from time to time in Sri Lankan Tamil diaspora literature. Uyirvaasam novel of Taamaraichelvi is important in Australia’s Tamil novel history. It is about boat peoples went from Sri Lanka to Australia. They went by the political Situation in Sri Lanka by boat. This is the first novel to be published on this subject. The plight of Sri Lankans Tamil Diaspora is recorded in the novel. It has been written realistically, from Sri Lanka to reaching Australia and experiencing various hardships. It is talk about death while sailing boat, children and women been affected and sent off to Sri Lanka after inquiry. These are presented through analytical, descriptive and historical approaches

The Dream and the Reality of Blue Spaces: The Search for Freedom in Offshore Sailing

Escaping to sea by sailing boat conjures up images of idyllic anchorages and cocktails at sunset. In this paper, the authors reflected on the reality of extended voyaging to highlight how freedom and escape are relative and constantly negotiated. The authors utilize dialogue in the analysis of the data and draw on lived experience informed by immersion in the cruising community. The authors highlight how living at sea requires adherence to an “alternative” set of obligations to land-based life. They argue that blue spaces are important as a setting for a range of experiences that allow the exploration of what is possible and how one might live well. This paper contributes to the research on human–water relationships, that is, reshaping how we conceptualize blue space(s).