ISO INTERNATIONAL STANDARD 13342 First edition 1995-10-15 Small craft --- Static thrust measurement for outboard motors Navires de plaisance - Mesurage de la poussée statique desmoteurshors-bord ISO Reference number ISO 13342:1995(E) for Standardization Not for Resale ISO13342:1995(E) Foreword ISO (the International ( Organization for Standardization)isa worldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through isO technical committees. Each member body interested in a subject for represented on that committee. International organizations, governmental and non-governmental, in liaison with isO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting avote. ISO/TC 188, Small craft. @ SO 1995 Alt rights reserved. Unless otherwise specified, no part of this publication may be photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization CasePostale56·CH-1211Geneve20Switzerland Printed in Switzerland i national Organization for Standardization No reproduction or networking permitted without license from IHS Not for Resale INTERNATIONAL STANDARD @ISO ISO13342:1995(E) Small craft - Static thrust measurement for outboard motors 1 Scope 4 Outboard motor This International Standard specifies the method for 4.1 When testing production outboard motors for for- measuring and declaring the forward and reverse mal declaration, the test unit shall be representative of thrust of outboard motors in a stationary situation to the manufacturer's production units. determine if start-in-gear protection, as specified in ISO 11547, is required. 4.2 The test outboard motor shall be run-in, operated and adjusted in accordance with the manufacturer's specifications. 2 Normative reference 4.3 The test outboard motor may be modified only if it is done in accordance with written instructions The following standard contains provisions which included in a modification kit provided by the manufac- throughreference in this text, constitute provisions of turer and listed in a catalogue or brochure by the ithis International Standard. At the time of publication, manufacturer. Any throttle limitation built into the the edition indicated was valid. All standards are standard engine for forward or reverse shall remain in isubject to revision, and parties to agreements based place unless specifically stated otherwise in the kit on this International Standard are encouraged to instructions. investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. 5 5Test conditions and procedure ISO 11547:1994, Small craft Start-in-gear protec- 5.1 The test shall be performed in still tion. Iwater between sea level and 250 m maximum altitude. 5.2 The minimum water depth below the propeller shaft centreline shall be 4 times the propeller diam- 3 Definitions eter. For the purposes of this International Standard, the 5.3 The test outboard motor thrust force shall be following definitions apply. calibrated to an accuracy within ± 2 % of the maxi- 3.1 thrust: Horizontal force, in newtons, which the mum thrust being observed. outboard motor is capable of producing. 5.4 No obstruction shall project below the water 3.2 declared value of maximum thrust: Average of surface in front of or behind the propeller so as to the thrust measurement that can be maintained for cause ventilation or induce cavitation. There shall be a not less than 10 s within ± 10 % of fluctuation at a clear flow area for 3 m