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23/07/03 14:51:33

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Subject: Re: longitudinal mast rigidity on TRAPPER 500 Author: Brian Henry [ Next Thread | Previous Thread | Next Message | Previous Message ] Date Posted: 29/01/05 18:23:03 In reply to: Gérard ALBIN 's message, "Re: longitudinal mast rigidity on TRAPPER 500" on 29/01/05 16:22:39 Hello Gérard, I have been worrying away at this point since you posted it and am still confused at the original informant’s meaning - if he runs a boatyard he should be knowledgeable about sailing yachts’ rigging. Perhaps John’s implication could be valid if the Trapper is in Dunkerque and not his boatyard in Bretagne! However, to gnaw away at the accusation; how could the Trapper 500 configuration be augmented to prevent an alleged longitudinal instability? The present mast support consists of a single forestay from the stem head to the masthead and a single backstay from the masthead to the transom chain plate and emerging aft of the cockpit coaming. Lateral support on each side is from a single masthead cap shroud and a single lower shroud to about ⅔ of mast height, both are in line attachment to a single chain plate through bolted to the internal cabin bulkhead and emerging through the deck to the chain plate attachment fitting. An inner forestay would be a possibility but this would need to be balanced by aft leading lower shrouds (for simple cruisers backstay runners to set up on every tack went out with wooden masts and non-masthead foretriangles), both of which would be problematic for sail setting – in the former case tacking with a large genoa and in the latter case squaring off the mainsail on a run. But with a thick enough mast section, as I believe the boat has, there is more than adequate rigidity to the mast with the existing rigging to maintain stability. Perhaps there is an argument to add two extra lower shrouds on each side, fore and aft of the existing set; this would add to longitudinal as well as lateral stability but as no problems have been experienced by myself and others, even in heavy weather, I suspect it would be overkill and add unnecessary weight and windage aloft. Good hunting and we will be looking forward to hearing of what you find in Dunkerque. Regards, Brian. [ Next Thread | Previous Thread | Next Message | Previous Message ]

Replies:

Subject Author Date Re: longitudinal mast rigidity on TRAPPER 500 john templar 31/01/05 3:22:56 Re: longitudinal mast rigidity on TRAPPER 500 -- Brian Henry, 31/01/05 13:15:11 Re: longitudinal mast rigidity on TRAPPER 500 -- Gérard ALBIN, 2/02/05 19:21:45 Re: longitudinal mast rigidity on TRAPPER 500 -- Brian Henry, 3/02/05 8:28:05