Bradz 13 Posted April 25 Report Share Posted April 25 (edited) 1 hour ago, Island Time said: Yep. See this old thread for details.... I'd like to see al the pics/diagrams from this thread Need some light hearted Saturday night reading. Edited April 25 by Bradz Quote Link to post Share on other sites
Ed 103 Posted April 25 Author Report Share Posted April 25 The equiplite stuff is nice but makes tylaska look cheap! I think the friction ring and soft shackle is going to be the way for now, just gotta sort out how to tie the shackle Quote Link to post Share on other sites
Island Time 748 Posted April 25 Report Share Posted April 25 23 minutes ago, Bradz said: I'd like to see al the pics/diagrams from this thread Need some light hearted Saturday night reading. Sorry, gone in the old system. Not retrievable. Quote Link to post Share on other sites
Bradz 13 Posted April 25 Report Share Posted April 25 29 minutes ago, Ed said: The equiplite stuff is nice but makes tylaska look cheap! I think the friction ring and soft shackle is going to be the way for now, just gotta sort out how to tie the shackle Problem you need to consider with the soft shakle option Ed, is the tolerance you have above the headboard to the crane. I have know those who tie a bowline from a friction ring, down side is its never going to be a constant for luff tension. Quote Link to post Share on other sites
SloopJohnB 149 Posted April 25 Report Share Posted April 25 2 hours ago, Bradz said: Need some light hearted Saturday night reading. Try this! https://issuu.com/nbaddour/docs/alexbergeron_undergradthesis Quote Link to post Share on other sites
Bradz 13 Posted April 25 Report Share Posted April 25 23 minutes ago, SloopJohnB said: Try this! https://issuu.com/nbaddour/docs/alexbergeron_undergradthesis Crikey, 94 pages, that will require more attention with a few less quite rums than currently consumed. Thanks for the link. Quote Link to post Share on other sites
armchairadmiral 241 Posted April 25 Report Share Posted April 25 Thanks for putting that up IT. I've waded through that lot last night and this morning, Pity the diagrams are lost. However knowledgable the written points may be I still can't understand how mast compression is reduced although it seems those with the experience say it is. Thanks again Quote Link to post Share on other sites
jim s 16 Posted April 26 Report Share Posted April 26 So i've done a couple of sketches and they show in a 1:1 setup with 50 kg (technically should be called 500 newtons) of force holding the sail in position there is 50 kg of "pull" in the halyard going from the sail going up to the sheave and of course the same 50kg pulling down inside the mast - so the sheave is compressing the mast by 100 kg. With a 2:1 set up there is only 25kg of load on the halyard so 25 kg where it terminates above the sheave plus the 25kg going from the sail up to the sheave as well as the 25kg coming down inside the mast giving a total of 75kg now... I'm pretty sure i've got this right , if needed i can get some help and post my sketches. It looks to me that armchairs drinking buddies are onto it Clipper and armchairadmiral 2 Quote Link to post Share on other sites
Island Time 748 Posted April 26 Report Share Posted April 26 Yep, that's about it... Quote Link to post Share on other sites
armchairadmiral 241 Posted April 26 Report Share Posted April 26 Thx Jim....I think I've just about got it now. It's the down ward force on the main luff that is the confusing point. But the anchor point for the halyard is at the mast crane. Then to a block on the main headboard so the load is 100 kg at masthead. So logically ( to my mind) the load at the mast step has to be 100 kg ? even if the load on the halyard is as you say? Thanks again for explanation Quote Link to post Share on other sites
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