Aerospace Micro-Lesson
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The Stepped Hull Hybrid Hydrofoil
The Stepped Hull Hybrid Hydrofoil Christopher D. Barry, Bryan Duffty Planing @brid hydrofoils or partially hydrofoil supported planing boat are hydrofoils that intentionally operate in what would be the takeoff condition for a norma[ hydrofoil. They ofler a compromise ofperformance and cost that might be appropriate for ferq missions. The stepped hybrid configuration has made appearances in the high speed boat scene as early as 1938. It is a solution to the problems of instability and inefficiency that has limited other type of hybrids. It can be configured to have good seakeeping as well, but the concept has not been used as widely as would be justified by its merits. The purpose of this paper is to reintroduce this concept to the marine community, particularly for small, fast ferries. We have performed analytic studies, simple model experiments and manned experiments, andfiom them have determined some specljic problems and issues for the practical implementation of this concept. This paper presents background information, discusses key concepts including resistance, stability, seakeeping, and propulsion and suggests solutions to what we believe are the problems that have limited the widespread acceptance of this concept. Finally we propose a “strawman” design for a ferry in a particular service using this technology. BACKGROUND Partially hydrofoil supported planing hulls mix hydrofoil support and planing lift. The most obvious A hybrid hydrofoil is a vehicle combining the version of this concept is a planing hull with a dynamic lift of hydrofoils with a significant amount of hydrofoil more or less under the center of gravity. lit? tiom some other source, generally either buoyancy Karafiath (1974) studied this concept and ran model or planing lift. -
Human Powered Hydrofoil Design & Analytic Wing Optimization
Human Powered Hydrofoil Design & Analytic Wing Optimization Andy Gunkler and Dr. C. Mark Archibald Grove City College Grove City, PA 16127 Email: [email protected] Abstract – Human powered hydrofoil watercraft can have marked performance advantages over displacement-hull craft, but pose significant engineering challenges. The focus of this hydrofoil independent research project was two-fold. First of all, a general vehicle configuration was developed. Secondly, a thorough optimization process was developed for designing lifting foils that are highly efficient over a wide range of speeds. Given a well-defined set of design specifications, such as vehicle weight and desired top speed, an optimal horizontal, non-surface- piercing wing can be engineered. Design variables include foil span, area, planform shape, and airfoil cross section. The optimization begins with analytical expressions of hydrodynamic characteristics such as lift, profile drag, induced drag, surface wave drag, and interference drag. Research of optimization processes developed in the past illuminated instances in which coefficients of lift and drag were assumed to be constant. These shortcuts, made presumably for the sake of simplicity, lead to grossly erroneous regions of calculated drag. The optimization process developed for this study more accurately computes profile drag forces by making use of a variable coefficient of drag which, was found to be a function of the characteristic Reynolds number, required coefficient of lift, and airfoil section. At the desired cruising speed, total drag is minimized while lift is maximized. Next, a strength and rigidity analysis of the foil eliminates designs for which the hydrodynamic parameters produce structurally unsound wings. Incorporating constraints on minimum takeoff speed and power required to stay foil-borne isolates a set of optimized design parameters. -
2008 Fact Book
2008 PUBLIC TRANSPORTATION FACT BOOK 59th Edition June 2008 PUBLISHED BY American Public Transportation Association American Public Transportation Association 1666 K Street, N.W., Suite 1100 Washington, DC 20006 TELEPHONE: (202) 496-4800 EMAIL: [email protected] WEBSITE: www.apta.com APTA’s Vision Statement Be the leading force in advancing public transportation. APTA’s Mission Statement APTA serves and leads its diverse membership through advocacy, innovation, and information sharing to strengthen and expand public transportation. APTA’s Policy on Diversity APTA recognizes the importance of diversity for conference topics and speakers and is committed to increasing the awareness of its membership on diversity issues. APTA welcomes ideas and suggestions on how to strengthen its efforts to meet these important diversity objectives. Prepared by John Neff, Senior Policy Researcher [email protected] (202) 496-4812 PUBLIC TRANSPORTATION FACT BOOK American Public Transportation Association Washington, DC June 2008 Material from 2008 Public Transportation Fact Book may be quoted or reproduced without obtaining the permission of the American Public Transportation Association. Suggested Identification: American Public Transportation Association: Public Transportation Fact Book, Washington, DC, June, 2008. TABLE OF CONTENTS Table of Contents 28. Fossil Fuel Consumption by Mode…………….. 31 29. Non-diesel Fossil Fuel Consumption by Fuel… 31 INTRODUCTION 30. Bus Power Sources…....................................... 31 31. Bus Fossil Fuel Consumption…………………... 32 PUBLIC TRANSPORTATION OVERVIEW…………… 7 32. Paratransit Fuel Consumption………………….. 32 33. Rail Vehicle Fuel and Power Consumption….… 32 NATIONAL SUMMARY………………………….....…… 15 SAFETY………………………...............………..........… 33 1. Number of Public Transportation Service Providers by Mode……………………………… 15 34. Fatality Rates by Mode of Travel, 2001-2003… 33 2. -
You Need to Get to the Airport to Catch a Plane. It's Ten Miles Away, and It's
You need to get to the airport to catch a plane. It’s ten miles away, and it’s the rush hour. Which do you think is the quickest way of getting there, and why? Choose from the options below. go by bus go by car go by taxi go by train go by motorbike go by bike go on foot Divide these words and phrases into two categories: cars and taxis and buses and trains. get a lift a double decker share a taxi hitchhike take the underground buy a return ticket catch the number 9 use public transport pay the fare put your foot down it’s delayed go on the sleeper miss your connection change at Swindon sit on the top deck a buffet car stuck in a traffic jam get on/off get in/out of a bus lane hail a taxi a taxi rank sit in the passenger seat reserve a first class seat miss the inter city express What’s the difference between the following? a. bus and coach b. train and tram c. helicopter and hovercraft d. passenger and pedestrian e. travel and commute © Macmillan Publishers Ltd 2005 Downloaded from the vocabulary section in www.onestopenglish.com Which word goes with all three sentences in each section? You may need to change the tense of the word: take ride drive catch 1 At the weekend I love to __________ into the country on my bike. We went on a __________ in a helicopter last week. The bus __________ from the airport was very pleasant. -
Getting to Orsa Maggiore Hotel Orsa Maggiore Is Located in Anacapri, the Highest and Most Peaceful Area of the Island of Capri
How to get to Hotel Orsa Maggiore Getting to Orsa Maggiore Hotel Orsa Maggiore is located in Anacapri, the highest and most peaceful area of the island of Capri. We provide a free shuttle service on arrival and departure , from the port to the hotel and vice versa. Navigational companies: Call us a couple of hours before you are scheduled to arrive on the island, letting us know which ferry or Roma Aliscafi SNAV +39 081 8377577 hydrofoil you are going to take: you’ll find our driver waiting for you at the port. ORSA MAGGIORE Caremar Spa +39 081 8370700 NLG Navigazione Libera del Golfo +39 081 8370819 Phone: +39 081 8373351 Port Authority +39 081 8370226 Capri’s port is a small one and it's not always possible to park vehicles near to the landing docks. When Tourist Information Offices the port is busy, we ask guests to wait for the driver next to the Funicular railway ticket office. +39 081 8370686 Our shuttle service is available from 09.00 until 20.30. Should you decide to arrive or leave early in the Napoli morning or late in the evening, you will need to take a taxi or the bus (Marina Grande-Anacapri). Sorrento Positano Capri Hydrofoils and ferries to Capri depart from Naples and Sorrento. How long will the journey take? In the summer months, sea crossings are also From Rome airport: minimum 3 hours available from Positano, Amalfi, Salerno and (traveling by fast train and without missing a the island of Ischia. single connection) Times of crossings are subject to variation and From Naples airport: 90mins it’s always a good idea to check the hydrofoil From Sorrento: 30mins and ferry schedule before you travel to the port. -
Shore Thing! Boeing to Use Its Rotorcraft Production Expertise in Bid to Supply U.S
Shore thing! Boeing to use its rotorcraft production expertise in bid to supply U.S. Navy with an advanced hovercraft By Marc Sklar he U.S. Navy’s next ‘air’craft may not take off with the head-snapping speed of PhOTO IlluSTRATION: an F/A-18 Super Hornet leaving the deck of a carrier. But it will still turn heads. The proposed Ship to Shore Flying on a cushion of air just feet above the water and land, this hovercraft, or Connector air cushion vehicle will T transport troops, equipment, air cushion vehicle, will transport troops, equipment, supplies and weapons from ships to supplies and weapons systems to landing zones. The Ship to Shore Connector is the Navy’s proposed replacement for its landing zones for the U.S. Navy. Landing Craft Air Cushion hovercraft that has been operational for more than two decades. BOEING ANd MARINETTE MARINE CORP. Boeing—with its large-scale systems integration expertise, rotorcraft production and product life-cycle support—has teamed with shipbuilder Marinette Marine Corp. to bid for the project. “The Marines and Army forces that will depend on the new craft are incorporating heavier vehicles into their operating units,’’ said Richard McCreary, chief executive of the shipbuilding firm. “They need higher speeds for increased operational tempos, and the ability to perform in even more hostile environments.’’ Carried in the belly of amphibious assault ships, the Ship to Shore Connector will be able to operate independent of tides, water depth, underwater obstacles, ice, mud or beach gradient. Its ability to move over water and land gives it flexibility to be used for everything from beach assaults to humanitarian efforts. -
Planning and Operational Analyses for a New Intercity Transit Service
Planning and Operational Analyses for A New Intercity Transit Service Item Type text; Electronic Dissertation Authors Ranjbari, Andisheh Publisher The University of Arizona. Rights Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction, presentation (such as public display or performance) of protected items is prohibited except with permission of the author. Download date 25/09/2021 07:58:17 Link to Item http://hdl.handle.net/10150/630234 PLANNING AND OPERATIONAL ANALYSES FOR A NEW INTERCITY TRANSIT SERVICE By ANDISHEH RANJBARI ________________________ Copyright © Andisheh Ranjbari 2018 A Dissertation Submitted to the Faculty of the DEPARTMENT OF CIVIL ENGINEERING AND ENGINEERING MECHANICS In Partial Fulfillment of the Requirements for the Degree of DOCTOR OF PHILOSOPHY In the Graduate College THE UNIVERSITY OF ARIZONA 2018 THE LTNIVERSITY OF ARIZONA GRADUATE COLLEGE As members of the Dissertation Commiuee, we certifu that we have read the dissertation prepared by Andisheh Ranjbari, titled Planning and Operation Analyses for A New Intercity Transit Service and recommend that it be accepted as fulfilling the dissertation requirement for the Degree of Doctor of Philosophy. Date: May 3,2418 Date: May 3,2018 Mark D. Hickman Date: May 3,2018 Neng Fan Date: May 3,2018 Final approval and acceptance of this dissertation is contingent upon the candidate's submission of the final copies of the dissertation to the Graduate College. I hereby certiff that I have read this dissertation prepared under my direction and recommend that it be accepted as fulfilling the dissertation requirement. -
Course Objectives Chapter 2 2. Hull Form and Geometry
COURSE OBJECTIVES CHAPTER 2 2. HULL FORM AND GEOMETRY 1. Be familiar with ship classifications 2. Explain the difference between aerostatic, hydrostatic, and hydrodynamic support 3. Be familiar with the following types of marine vehicles: displacement ships, catamarans, planing vessels, hydrofoil, hovercraft, SWATH, and submarines 4. Learn Archimedes’ Principle in qualitative and mathematical form 5. Calculate problems using Archimedes’ Principle 6. Read, interpret, and relate the Body Plan, Half-Breadth Plan, and Sheer Plan and identify the lines for each plan 7. Relate the information in a ship's lines plan to a Table of Offsets 8. Be familiar with the following hull form terminology: a. After Perpendicular (AP), Forward Perpendiculars (FP), and midships, b. Length Between Perpendiculars (LPP or LBP) and Length Overall (LOA) c. Keel (K), Depth (D), Draft (T), Mean Draft (Tm), Freeboard and Beam (B) d. Flare, Tumble home and Camber e. Centerline, Baseline and Offset 9. Define and compare the relationship between “centroid” and “center of mass” 10. State the significance and physical location of the center of buoyancy (B) and center of flotation (F); locate these points using LCB, VCB, TCB, TCF, and LCF st 11. Use Simpson’s 1 Rule to calculate the following (given a Table of Offsets): a. Waterplane Area (Awp or WPA) b. Sectional Area (Asect) c. Submerged Volume (∇S) d. Longitudinal Center of Flotation (LCF) 12. Read and use a ship's Curves of Form to find hydrostatic properties and be knowledgeable about each of the properties on the Curves of Form 13. Calculate trim given Taft and Tfwd and understand its physical meaning i 2.1 Introduction to Ships and Naval Engineering Ships are the single most expensive product a nation produces for defense, commerce, research, or nearly any other function. -
How to Get to Capri Town How to Get to Capri Town Upon Arrival at the Marina Grande Port, Take the Funicular to the Center of Capri (A Four Minute Ride)
How to get to Capri Town How to Get to Capri Town Upon arrival at the Marina Grande port, take the funicular to the center of Capri (a four minute ride). Once you have exited the funicular, instead of climbing the stairs to the scenic terrace, pass through the Navigational companies: gate on the left. You will find yourself in a narrow lane; walk down a few meters and Capri Town is on the Aliscafi SNAV +39 081 8377577 right. Caremar Spa +39 081 8370700 NLG Navigazione Libera del Golfo Roma +39 081 8370819 To transport baggage on the funicular, you must buy a supplementary ticket for €1.80 per piece. Port Authority +39 081 8370226 If you choose to take a taxi to get here, keep in mind that the car can't reach directly the door of Capri Town, since it is situated in a pedestrian area. Ask the driver to leave you in Piazzetta (and not at the beginning of Tourist Information Offices Via Acquaviva). From here follow the stairs that go down between Piccolo Bar and Bar Caso. In this way you +39 081 8370686 have to walk only a short downhill section. Napoli Sorrento Positano Capri Hydrofoils and ferries to Capri depart from Naples and Sorrento. In the summer months, How long will the journey take? sea crossings are also available from From Rome airport: minimum 3 hours Positano, Amalfi, Salerno and the island of (traveling by fast train and without missing a Ischia. Times of crossings are subject to variation and it’s always a good idea to check single connection) the hydrofoil and ferry schedule before you From Naples airport: 90mins travel to the port. -
2019 NTD Policy Manual for Reduced Reporters
Office of Budget and Policy National Transit Database 2019 Policy Manual REDUCED REPORTING 2019 NTD Reduced Reporter Policy Manual TABLE OF CONTENTS List of Exhibits .............................................................................................................. v Acronyms and Abbreviations .................................................................................... vii Report Year 2019 Policy Changes and Reporting Clarifications .............................. 1 Introduction ................................................................................................................... 6 The National Transit Database ................................................................................... 7 History .................................................................................................................... 7 NTD Data ................................................................................................................ 8 Data Use and Funding .......................................................................................... 11 Failure to Report ................................................................................................... 14 Inaccurate Data .................................................................................................... 15 Standardized Reporting Requirements ..................................................................... 15 Reporting Due Dates ........................................................................................... -
Issue #30, March 2021
High-Speed Intercity Passenger SPEEDLINESMarch 2021 ISSUE #30 Moynihan is a spectacular APTA’S CONFERENCE SCHEDULE » p. 8 train hall for Amtrak, providing additional access to Long Island Railroad platforms. Occupying the GLOBAL RAIL PROJECTS » p. 12 entirety of the superblock between Eighth and Ninth Avenues and 31st » p. 26 and 33rd Streets. FRICTIONLESS, HIGH-SPEED TRANSPORTATION » p. 5 APTA’S PHASE 2 ROI STUDY » p. 39 CONTENTS 2 SPEEDLINES MAGAZINE 3 CHAIRMAN’S LETTER On the front cover: Greetings from our Chair, Joe Giulietti INVESTING IN ENVIRONMENTALLY FRIENDLY AND ENERGY-EFFICIENT HIGH-SPEED RAIL PROJECTS WILL CREATE HIGHLY SKILLED JOBS IN THE TRANS- PORTATION INDUSTRY, REVITALIZE DOMESTIC 4 APTA’S CONFERENCE INDUSTRIES SUPPLYING TRANSPORTATION PROD- UCTS AND SERVICES, REDUCE THE NATION’S DEPEN- DENCY ON FOREIGN OIL, MITIGATE CONGESTION, FEATURE ARTICLE: AND PROVIDE TRAVEL CHOICES. 5 MOYNIHAN TRAIN HALL 8 2021 CONFERENCE SCHEDULE 9 SHARED USE - IS IT THE ANSWER? 12 GLOBAL RAIL PROJECTS 24 SNIPPETS - IN THE NEWS... ABOVE: For decades, Penn Station has been the visible symbol of official disdain for public transit and 26 FRICTIONLESS HIGH-SPEED TRANS intercity rail travel, and the people who depend on them. The blight that is Penn Station, the new Moynihan Train Hall helps knit together Midtown South with the 31 THAILAND’S FIRST PHASE OF HSR business district expanding out from Hudson Yards. 32 AMTRAK’S BIKE PROGRAM CHAIR: JOE GIULIETTI VICE CHAIR: CHRIS BRADY SECRETARY: MELANIE K. JOHNSON OFFICER AT LARGE: MICHAEL MCLAUGHLIN 33 -
UK Military Hovercraft Trials Units
Appendix 1 UK Military Hovercraft Trials Units Background When Christopher Cockerell was seeking support for the development of the hovercraft principle, it was the intervention of the late Earl Mountbatten that was of signifi cant help. With his background in Amphibious Warfare, he immediately saw the potential for this new concept, so much so that it was initially classifi ed as Top Secret. Eventually, the Saunders Roe, SR.N1, was built and launched on 11 June 1959 to further evaluate the potential of the concept. This new vehicle attracted great pub- licity and interest in the UK. Military interest led to the formation of an Interservice Hovercraft Working Party in 1961 and the formation of the Interservice Hovercraft (Trials) Unit (IHTU) at HMS Ariel (later HMS Daedalus), at Lee-on-the-Solent just west of Portsmouth harbour. IHTU personnel were drawn from the Royal Navy, Royal Marines, Royal Air Force and the Army. The different Service backgrounds and training assisted both in routine maintenance and fault fi nding on these special craft. Additionally, after the traditional 3-year tour, personnel were drafted to active units and able to spread the message about the usefulness of amphibious hovercraft. Figure A1.1 shows the Unit in the NHTU days with SR.N6, BH 7 and VT 2 craft present. The Early Days In order to evaluate hovercraft military potential, to start with craft were hired from their manufacturers and operated from Lee-on-the-Solent. These evaluations served the double purpose of enabling Service personnel to gain experience of hovercraft operations and assisting manufacturers in the development of their craft.