Image icon  Mast locking gate for the Topper dinghy

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Description: This is a photograph showing mast locking gate for the Topper dinghy redesigned in glass-filled polypropylene: (a) split apart to show component parts. Upper and lower plates and rotating cam activate by drawcord; (b) shown in situ in closed position without mast. The composite moulding replaced a single marine ply board drilled with a single hole for the mast. The redesigned hull incorporated several features which enhanced its ease of assembly, performance and integrity: mast locking gate enables rapid insertion of the sail and mast on launching.
The Topper is a one-design boat sailed mostly in the British Isles. The Topper was originally designed with a glass reinforced plastic (GRP) hull, however, it was later decided that the Topper should be constructed with injection moulding, using polypropylene, which makes it a relatively light but durable boat. Following this change from the GRP to plastic hull sales of the Topper soared.
Keywords: Topper boat • dinghy • glass reinforced plastic • GRP • polypropylene • hull • deck • lightweight • mast • design • composite • image
Categories: Materials > Polymers & elastomers
Materials > Polymers & elastomers > Plastics
Materials > Polymers & elastomers > Plastics > Thermoplastics > Polypropylene (PP)
Applications > Sports & leisure
Other topics > Design
Created by: Mike Levers, The Open University
The Open University
Published by: The Open University
License: This resource is released under the Creative Commons Attribution Non-Commercial Share Alike license (2.0 UK: England & Wales).
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Date created: 09 March 1998
Date added: 15 December 2010
Resource ID: 3301