... Re: Stephen Thanks for the tip! I'll look at T. Colvin's setup as soon as I can. Re: David Nifty. I thought of a crazy notion that may or may not be used...
863
Robert.Biegler@...
Oct 1, 2001 3:56 pm
... You mean buckling strength? ... Whether that makes sense depends on your material. Wood is stronger in tension than in compression. If you bend anything,...
864
Robert.Biegler@...
Oct 1, 2001 4:02 pm
I realised my previous reply was most relevant to unstayed masts under bending loads. If your mast is stayed, then you have a lot of compression on it...
865
Victor Winterthun
victor.winterthun@...
Oct 1, 2001 10:34 pm
Hi. 1. I see some of you are talking about PVC as a suitable material for masts!. Don't try it!. It is not strong enough, and it will "sag" over time. 2....
866
Thundershield@...
Oct 2, 2001 12:52 am
I had a 40' Wharram in the 70's that was junk rigged with stays. It was a ketch and the rig was Wharram's design. Don....
867
jeff.robinson@...
Oct 2, 2001 3:01 pm
I will be out of the office starting 01/10/2001 and will not return until 22/10/2001. I am on leave - Libby Cochrane, solicitor, will be available for limited...
868
timothy@...
Oct 2, 2001 9:12 pm
Well, you've all given me quite a bit to think about, and to talk to a structural engineer about. Thanks for the advice! --Timothy...
869
Willem Schultink
willem@...
Oct 3, 2001 4:43 am
Hi, I've had some thoughts about a deckstepped unstayed mast. It seems to me that the basic criteria that need to be met as far a the mast staying up are ...
870
dave johnson
dehjohnson@...
Oct 3, 2001 4:53 am
I am interested in information regarding the type of junk rig that has the best pointing ability. What design factors affect how well the sail can point, ...
871
Tim Anderson
tim@...
Oct 3, 2001 6:21 am
The "Point" of these rigs is not "pointing"; it is rather ease of reefing and shaking out the reef, quiet tacking, long life, maintainability in third world...
872
Victor Winterthun
victor.winterthun@...
Oct 3, 2001 9:07 am
Hi. Two things are important for best pointing with a junkrig. 1. The mast should be as slim as possible. 2. The sail should hang as close to the mast as...
873
Alan Cooke
pactn@...
Oct 3, 2001 9:14 am
Quite some time ago it was decided that it would be fun to race sailboats. Only trouble was no one could get back to the starting line so designers sat down...
874
timothy@...
Oct 4, 2001 4:48 pm
A bit of thought and advice later, and some research, the idea of using PVC as a mast still has merit, assuming it is supported internally. One of the things I...
875
Paul Sommers
psommers1249@...
Oct 4, 2001 7:26 pm
My masts on a Gazelle (schooner with stayed masts, dead eyes, pin rails etc. with junk sails) is aluminum but round in cross section, and tapered as you go up....
876
timothy@...
Oct 5, 2001 12:30 am
... Well, yes. Flag poles are quite expensive, though.. especially in the dimensions you would need for a good mast. Better than $5k, at last I looked. If...
877
nospamforme@...
Oct 5, 2001 1:21 am
Following up on Paul's post: My Gazelle uses straight industrial 6061-T6 aluminium pipe, (schedule 40 in NA). It probably does not look as pretty as a nice...
878
Willem Schultink
willem@...
Oct 5, 2001 1:37 am
Hi, Just interested, why does a tabernacle stepped mast have 25% of the strength of a keel stepped mast? I don't have Tom Colvin's book. but it doesn't make ...
879
Paul Liebenberg
Zelda@...
Oct 5, 2001 1:51 am
. ... A tree would be cheap. Paul...
880
nospamforme@...
Oct 5, 2001 2:39 am
Whoops, I mistated Tom Colvin. It is 50%. I don't think that I can reproduce the math here. I really recommend Tom's Book which I suspect is available in...
881
nospamforme@...
Oct 5, 2001 2:47 am
Timothy: If you want a really cheap mast then use steel tube sand-blasted and painted with epoxy paint on the outside and tarred on the inside. You don't need...
882
Willem Schultink
willem@...
Oct 5, 2001 3:06 am
Hi, Don, thanks for the reply. You're right, Euler's law refers to stayed masts, which is not what I'm referring to. My question is, why shouldn't a ...
883
Tim Anderson
tim@...
Oct 5, 2001 3:56 am
One factor to be considered is the weight of the tabernacle and its location. If the Tabernacle is solely mounted to the deck then it will by necessity be...
884
Willem Schultink
willem@...
Oct 5, 2001 4:06 am
Hi, Tim, I take your point. I hadn't thought of a through deck tabernacle and its necessary attendant, the well placed hatch. I haven't seen one of these. Is ...
885
Tim Anderson
tim@...
Oct 5, 2001 4:14 am
Phil Bolger has done quite a few, try a google search on bolger and tabernacle... i'll bet that will get some reading for you. ... From: Willem Schultink...
886
Victor Winterthun
victor.winterthun@...
Oct 5, 2001 10:19 am
Hi. When talking about materials for masts. I remember a man, not far from here, who made a mast using steel pipe ment for ventilation. Socalled Spiro pipe. It...
887
Craig O'Donnell
dadadata@...
Oct 5, 2001 12:09 pm
I think there might be some merit in using PVC pipe to sleeve around a steel I beam to make a mast if that's your only alternative. But aluminum and steep pipe...
888
Leo W. Foltz
leo@...
Oct 5, 2001 2:19 pm
In chapter ten of Phil Bolger's book: Boats with an Open Mind one can find four different approaches to the tabernacle+unstayed mast problem. AS 29', Loose...
889
nospamforme@...
Oct 5, 2001 2:44 pm
When I was a kid in England about 40 years ago I used to go sailing in an area on the east coast called the "Broads". There were lots of low fixed bridges...
890
nospamforme@...
Oct 5, 2001 2:56 pm
... masts, ... suitably ... strong ... Willem: I don't know. Robin Blain (of the JRA) has done something like this with a McGregor (about 26'). It is really...
891
dave johnson
dehjohnson@...
Oct 7, 2001 6:08 am
Actually, if I can get a rig that will point 45* off the wind, I would be more than satisfied. I am looking into micro sailing, as in canoe sailing. I am ...
