Hobie Kayak Parts & Accessories
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Here It Comes Again!
Here It Comes Again! Boomerangs Someone once said that if you understand the principles governing the flight of boomerangs, there is nothing about aeronautics you won’t understand. The Australian Aborigines 10,000 years ago created an incredibly complex flying device that operates because of the interaction of many scientific principles and laws including. Bernoulli’s Principle-The pressure of a fluid, such as air, decreases as its velocity over a surface increases. (Generates lift from curved upper surface of boomerang.) Newton's First Law of Motion-An object continues in a state of rest or in motion in a straight line unless it is acted upon by an unbalanced force. (Describes flight of nonreturning boomerangs and why gyroscopic precession is necessary for returning boomerangs.) Newton's Second Law of Motion-The acceleration of an object is directly proportional to the force acting upon it and inversely proportional to the object's mass. (Describes the amount of lift produced from the underside of a boomerang.) Newton's Third Law of Motion-For every action force there is an opposite and equal reaction force. (Produces lift from the underside of the boomerang.) Gyroscopic Precession-Torque on the axis of rotation of the flying boomerang causes it to precess or change its direction. (Causes the boomerang to circle. Note: Nonreturning boomerangs do not experience this effect.) Drag-Drag forces (friction with air) slow boomerang flight. (By slowing the boomerang, drag gradually reduces lift.) Gravity-Gravity's attraction brings the boomerang back to Earth. (Causes boomerang to lose altitude. Boomerangs, or "booms" as they are called Grade Level by enthusiasts, are curved sticks of wood or plastic that either return to the thrower or This lesson is designed for middle to junior travel in straight paths for long distances. -
Skateboarding
4-H 365.00 General OHIO STATE UNIVERSITY EXTENSION PROJECT IDEA STARTER Skateboarding by Angela and Christopher Yake, Clark County 4-H Volunteers; Patty House, Ohio State University Extension 4-H Youth Development Educator, Clark County; and Jonathan Spar, Skateboarder Consultant Ever wonder where skateboarding See “4-H Skateboarding Permission, Disclosure got its start? Do you consider and Release of Claims” Form on page 6. skateboarding a sport or a hobby? Have you been skateboarding for years, or is this your first time jumping on the board? Regardless of your skateboarding experience, safety is essential in preventing injuries and advancing your skill. What Is a Skateboard? The movie “Back to the Future” featured Michael J. When you look at a skateboard, what does it remind Fox taking a fruit crate scooter on wheels and kicking you of? Maybe a surfboard with four wheels. While the crate off to skateboard down the streets. This waves help guide a surfboard, the rider’s feet apparatus is commonly accepted as the predecessor help propel the skateboard. You can travel short to the skateboard and was created in the 1930s. distances on them, but most skateboards are used to Early skateboards were made with scraps of wood. perform stunts. Four metal wheels were taken from a scooter or Let’s take a closer look at the skateboard. Every rollerskate and attached to the bottom. Recognizable skateboard consists of three parts: the deck, the truck skateboards were first manufactured in the late 1950s. and the wheels. The deck is the actual board you California surfers were the first to pick up ride on. -
MEMORANDUM – JABSOM Skateboard, Bicycle and Surfboard Policy the University Has an Obligation to Provide a Safe Environment An
MEMORANDUM – JABSOM Skateboard, Bicycle and Surfboard Policy The University has an obligation to provide a safe environment and protect University property. JABSOM recognizes that students, faculty, and staff use a variety of means of transportation on campus. Although personal choice is important, JABSOM must consider the safety and well‐being of the campus community and our visitors as well as JABSOM property. Activities that include skateboarding may cause damage to sidewalks. In addition, there is a potential for injury to both the person doing the activity and the public at large. In an effort to balance our concern for community safety and the ability to use these means of transportation, the following policy applies to the use of bicycles and skateboards on campus (policies applicable to skateboards apply to roller‐skates and in‐line skates). Skateboarding, conducted in a reckless manner can be dangerous and presents a safety issue for pedestrians, as well as the skate boarder. Skateboarding has also caused significant damage to benches, walls, steps, curbs, and receptacles around campus. Nevertheless, skateboarding, when good judgment is exercised is an effective means to travel in urban areas. Skateboard (as well as roller skates and rollerblades) and bicycle use on JABSOM premises is allowed. However, it is the person on the skateboard or bicycle that is responsible for avoiding pedestrians and not the other way around. The use of these items, involves an assumption of personal risk. Persons who use them are personally liable for their actions Skateboards and bicycles shall be used solely to convey a person and shall not be used to perform tricks or carryout reckless or risky actions such as riding on ledges or using on steps. -
Chapter 430 BICYCLES, SKATEBOARDS and ROLLER SKATES
Chapter 430 BICYCLES, SKATEBOARDS AND ROLLER SKATES § 430.01. Definitions. [Ord. No. 458, passed 2-25-1991; Ord. No. 535, passed 7-8-1996] The following words, when used in this chapter, shall have the following meanings, unless otherwise clearly apparent from the context: (a) BICYCLE — Shall mean any wheeled vehicle propelled by means of chain driven gears using footpower, electrical power or gasoline motor power, except that vehicles defined as "motorcycles" or "mopeds" under the Motor Vehicle Code for the State of Michigan shall not be considered as bicycles under this chapter. This definition shall include, but not be limited to, single-wheeled vehicles, also known as unicycles; two-wheeled vehicles, also known as bicycles; three-wheeled vehicles, also known as tricycles; and any of the above-listed vehicles which may have training wheels or other wheels to assist in the balancing of the vehicle. (b) SKATEBOARD — Shall include any surfboard-like object with wheels attached. "Skateboard" shall also include, under its definition, vehicles commonly referred to as "scooters," being surfboard-like objects with wheels attached and a handle coming up from the forward end of the surfboard area. (c) ROLLER SKATES — Shall include any shoelike device with wheels attached, including, but not limited to, roller skates, in-line roller skates and roller blades. § 430.02. Operation upon certain public ways prohibited; sails and towing prohibited. [Ord. No. 458, passed 2-25-1991; Ord. No. 677, passed 12-8-2003] (a) No person shall ride or in any manner use a skateboard, roller skate or roller skates upon the following public ways: (1) U.S. -
HOBIE KA Y AKING + F I S HING C O Ll EC T
HOBIE KAYAKING + FISHING COLLECTION HOBIE HISTORY 1994 The Hobie Float Cat 1984 marked the company’s The windsurfing scene first cast into angling. was exploding and Hobie contributed 1987 by distributing Alpha Ladies love watersports, 1968 1977 . so Hobie delivered After ample hands-on Seeking all-out speed, Sailboards fashion-forward, R&D, Hobie introduced a the Hobie 18 delivered functional lightweight, beachable serious velocity thrills to women’s . sailing catamaran, the sailors worldwide. swimwear Hobie 14. 1958 Hobie teamed up 1950 with Grubby Clark to Hobie Alter shaped produce the world’s 1994 The Hobie Wave was his first surfboard in first fiberglass-and- designed and crafted his parents’ Laguna foam-core boards, as the perfect, simple, Beach garage. revolutionizing surfing. 1982 rotomolded catamaran. Reading the water is tricky, but Hobie tamed reflected light with its line 1986 Pursuing new ways of polarized sunglasses. to play, Hobie intro- 1966 1974 duced its first kayak, Recognizing that Introduced the the Alpha Wave Ski. people needed Hobie Hawk remote better-quality, sport- controlled glider. specific clothing, Hobie started selling his now-iconic line of sportswear. 1954 1962 Demand for Hobie’s After witnessing the birth boards spiked, so he of skateboarding, Hobie opened his first Surf introduced polyurethane 1970 Shop in Dana Point, skateboard wheels—the Classic. The two-person, 1982 1985 1987 California. sport’s biggest evolution. double-trapeze Hobie 16 The Hobie 33, the The Hobie 17 redefined The Hobie 21 was became an international fastest, sleekest one-person multihulls, bigger, faster, and sensation, instantly sparking monohull in its class. -
CHILD SKATEBOARD and SCOOTER INJURY PREVENTION Suggested Citation
Safekids New Zealand Position Paper: CHILD SKATEBOARD AND SCOOTER INJURY PREVENTION Suggested citation Safekids New Zealand (2012) Safekids New Zealand Position Paper: Child skateboard and scooter injury prevention. Auckland: Safekids New Zealand. If you use information from this publication please acknowledge Safekids New Zealand as the source. Safekids New Zealand 5th Floor, Cornwall Complex, 40 Claude Road, Epsom, Auckland 1023 PO Box 26488, Epsom, Auckland 1344 New Zealand P. +64 9 630 9955 F. +64 9 630 9961 Disclaimer Safekids New Zealand has endeavoured to ensure material in this document is technically accurate and reflects legal requirements. However, the document does not override legislation. Safekids New Zealand does not accept liability for any consequences arising from the use of this document. If the user of this document is unsure whether the material is correct, they should make direct reference to the relevant legislation and contact Safekids New Zealand. Published 2013 If you have further queries, call the Safekids New Zealand Information & Resource Centre on +64 9 631 0724 or email us at [email protected]. This document is available on the Safekids New Zealand website at www.safekids.org.nz Sponsored By This Safekids New Zealand position paper on skateboard and scooter injury prevention was made possible thanks to Jetstar's Flying Start Programme grant. Photo shows Jetstar's Captain Richard Falkner, Safekids Director Ann Weaver, Jetstar Ambassador Steve Price and children from Vauxhall Primary School. Safekids New Zealand Position Paper: Child skateboard and scooter injury prevention 1 Safekids New Zealand Position Paper: CHILD SKATEBOARD AND SCOOTER INJURY PREVENTION Summary Skateboards and non-motorised kick scooters provide Helmets children with a valuable form of exercise and transport. -
Literature Review of Bicycle and E-Bike Research, Policies & Management
Literature Review Recreation Conflicts Focused on Emerging E-bike Technology December 19, 2019 Tina Nielsen Sadie Mae Palmatier Abraham Proffitt Acknowledgments E-bikes are still a nascent technology, and the research surrounding their use and acceptance within the recreation space is minimal. However, with the careful and constructive guidance of our consultants, the report outline morphed into chapters and, eventually, into a comprehensive document. We are deeply indebted to Mary Ann Bonnell, Morgan Lommele, and Stacey Schulte for guiding our thinking and research process and for supplementing our findings with resources and other support. We would like to express our deep appreciation to Lisa Goncalo, Tessa Greegor, Jennifer Alsmstead, and Rick Bachand for their careful and thoughtful reviews. Your gracious offer of time and knowledge was invaluable to our work. We also wish to acknowledge the help of Kacey French, John Stokes, Alex Dean, June Stoltman, and Steve Gibson for their consideration and continued interest in the process. Thanks are also due to colleagues at the Boulder County Parks & Open Space and Boulder County Transportation Departments, who offered their expertise at crucial moments in this process. We would like to offer our special thanks to Bevin Carithers, Pascale Fried, Al Hardy, Eric Lane, Tonya Luebbert, Michelle Marotti, Jeffrey Moline, Alex Phillips, and Marni Ratzel. None of this work would have been possible without the generous financial support from the City of Boulder, City of Fort Collins, and Larimer -
The .Pdf File
Bicycle Helmet Safety Institute Helmets.org 4611 Seventh Street South, Arlington, VA 22204-1419 703-486-0100 www.helmets.org [email protected] Helmet Program Toolkit October 6, 2020 Contents Program Resources Folded Pamphlet Duplicating Masters • Helmet Program Resources • Buyer’s Guide To Bicycle Helmets • Helmet Fact Sheet • A Bicycle Helmet for My Child • Where to Find Funding • How to Fit a Bicycle Helmet • Inexpensive Helmets • Skateboard Helmets • Videos and Films • Public Service Announcements • Child Bike Safety Talk Flat Pamphlet Duplicating Masters • Workshop on Bicycle Helmets • The Correct Way to Fit Your Helmet • Speaker's outline for a bike helmet talk • Helmet Fit Checklist • US DOT materials on your CD • Spanish helmet fit sheet – DOT • Spanish Language Materials • Traffic Safety Facts: Bicyclists • Helmets in Poor Neighborhoods • How to Inspect a Bike Helmet • Common Bicycle Collisions Basic Info • Bicycle Safety Tips • Helmets Made Simple • Frequently Asked Questions • Costs of Head Injury/Benefit of Helmets Other Handouts • Helmets and Playgrounds Don’t Mix! • Which Helmet for Which Activity • Medical Journal Articles • Bookmarks to print and cut • Helmet Standards • Word Game and Tongue Twisters • Helmets for the Current Season • A Maze and Connect-the-Dots • Consumer Reports Helmet Article • A Coloring Page • Mandatory Helmet Laws • A Four-Page Coloring Book CD and DVD’s • CD : BHSI Web site, pamphlet files, lesson plans, WABA safety site, rodeo guide. • DVDs : Helmet and bike safety videos Paper version is printed on 100% post-consumer content recycled paper. Helmets.org The Bicycle Helmet Safety Institute A consumer-funded program 4611 Seventh Street South, Arlington, VA 22204-1419 703-486-0100 www.helmets.org [email protected] October, 2020 Helmet Program Resources Dear Educator or Program Planner: In response to your request, here is information on helmets and helmet promotion campaigns. -
“Politics” and “Religion” in the Upper Paleolithic: a Voegelinian Analysis of Some Selected Problems
“Politics” and “Religion” in the Upper Paleolithic: A Voegelinian Analysis of Some Selected Problems DRAFT ONLY Barry Cooper University of Calgary Paper prepared for APSA Annual Meeting Seattle WA September, 201 2 Outline 1. Introduction 2. Philosophy of consciousness 3. “Politics” 4. “Religion 5. Conclusions 3 “Politics” and “Religion” in the Upper Paleolithic 1. Introduction The Voegelinian analysis referred to in the title refers primarily to two elements of the political science of Eric Voegelin. The first is his philosophy of consciousness, systematically developed first in Anamnesis.1 The second is his concept of compactness and differentiation of experience and symbolization. It will be necessary to touch upon a few other Voegelinian concepts, notably his understanding of “equivalence,” but for reasons of space only a summary presentation is possible. A second preliminary remark: the terms “Religion” and “Politics” are in quotation marks because their usage in the context of the Upper Paleolithic is anachronistic, though not entirely misleading. The meaning of these terms is commonsensical, not technical, and is meant to indicate what Clifford Geertz once called “oblique family-resemblance connections” among phenomena.2 Third, as a matter of chronology the Upper Paleolithic conventionally refers to the period between 50,000 and 10,000 years ago (50KYBP- 1 Voegelin refined his analysis of consciousness in the last two volumes of Order and History. These changes are ignored on this occasion. 2 Geertz, Life Among the Anthros, ed. Fred Inglis (Princeton: Princeton University Press, 2010), 224. 4 10KYBP). It corresponds in Eurasian periodization approximately to the Later Stone Age in Africa. -
Human Origin Sites and the World Heritage Convention in Eurasia
World Heritage papers41 HEADWORLD HERITAGES 4 Human Origin Sites and the World Heritage Convention in Eurasia VOLUME I In support of UNESCO’s 70th Anniversary Celebrations United Nations [ Cultural Organization Human Origin Sites and the World Heritage Convention in Eurasia Nuria Sanz, Editor General Coordinator of HEADS Programme on Human Evolution HEADS 4 VOLUME I Published in 2015 by the United Nations Educational, Scientific and Cultural Organization, 7, place de Fontenoy, 75352 Paris 07 SP, France and the UNESCO Office in Mexico, Presidente Masaryk 526, Polanco, Miguel Hidalgo, 11550 Ciudad de Mexico, D.F., Mexico. © UNESCO 2015 ISBN 978-92-3-100107-9 This publication is available in Open Access under the Attribution-ShareAlike 3.0 IGO (CC-BY-SA 3.0 IGO) license (http://creativecommons.org/licenses/by-sa/3.0/igo/). By using the content of this publication, the users accept to be bound by the terms of use of the UNESCO Open Access Repository (http://www.unesco.org/open-access/terms-use-ccbysa-en). The designations employed and the presentation of material throughout this publication do not imply the expression of any opinion whatsoever on the part of UNESCO concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. The ideas and opinions expressed in this publication are those of the authors; they are not necessarily those of UNESCO and do not commit the Organization. Cover Photos: Top: Hohle Fels excavation. © Harry Vetter bottom (from left to right): Petroglyphs from Sikachi-Alyan rock art site. -
Boomerang Flight Dynamics
Boomerang Flight Dynamics John C. Vassberg∗ Long Beach, California 90803 Aerodynamics Lecture 30th AIAA Applied Aerodynamics Conference New Orleans, Louisiana 28 June, 2012 Abstract Aerodynamic characteristics and flight dynamics of boomerangs are investigated. A basic aerodynamic model, developed in the 1960’s, is expanded upon using Blade Element Theory. The new aerodynamic model is coupled with a gyroscope model for rudimentary analyses. Some significant findings are made regarding the radius of a boomerang’s circular flight path, the required inclination angle of its axis-of-rotation, its trim state, as well as its dynamic stability. These discoveries provide a basic understanding of how the interplay between aero- dynamic forces and moments, and gyroscopic precession combine to return the boomerang to its rightful owner by way of a circular flight path. A traditional V-shaped boomerang design is developed as a case study for further detailed analyses. Unsteady Reynolds-averaged Navier-Stokes solutions provide accurate aerodynamic characteristics of the subject boomerang. The high-fidelity aerodynamic model is coupled with the equations of motion to provide accurate six-degree-of-freedom simulations of boomerang flight dynamics. Boomerang orientation during its flight trajectory is described by the classical Euler angles. ∗Boeing Technical Fellow, Fellow AIAA, Boomerang Novice Copyright c 2012 by John C. Vassberg. Published by the American Institute of Aeronautics and Astronautics with permission. Vassberg, Aerodynamics Lecture, New Orleans, -
A Typology of the Traditional Games of Australian Aboriginal and Torres Strait Islander Peoples
A Typology of the Traditional Games of Australian Aboriginal and Torres Strait Islander Peoples Ken Edwards Author Ken Edwards has studied health and physical education, environmental science and sports history. He has taught health and physical education at both primary and secondary school level and has been a Head of Health and Physical Education at various schools. Ken completed a Ph.D. through UQ and has been an academic at QUT and Bond University and is now an Associate Professor in Sport, Health and Physical Education at USQ (Springfield Campus). Ken has had involvement in many sports as a player, coach and administrator. Wener ganbony tilletkerrin? What shall we play (at) first (Language of the Western people of Victoria) A Typology of the Traditional Games of Australian Aboriginal and Torres Strait Islander Peoples Ken Edwards Artwork by Aboriginal artist Maxine Zealey (of the Gureng Gureng people in Queensland). Copyright © 2012 by Ken Edwards. All rights are reserved. No portion of this book may be reproduced in any form or by any means without the written permission of the Copyright owner. ISBN 978-0-9872359-0-9 Paper size: 16.5cms X 23 cms Page printing for ebook: Scale to fit A4 Acknowledgements Great excitement existed amongst the players in this game, which was begun in this manner: each player had one of these toys in his hands, standing at a mark on the ground some 30 yards or 40 yards from the disc. The thrower standing on the mark would measure the distance with his eye, and turning round would walk some few yards to the rear, and suddenly turning to the front would run back to the mark, discharging his weitweit with great force at the disc.