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Showing results 1 to 16 of 16
Search took 0.00 seconds. Search: Posts Made By: bmz
Forum: Deck hardware: Rigging, Sails & Hoisting 16-10-2014, 14:19
Replies: 71
Views: 7,202
Posted By bmz
Re: Main Sail Runner (or not)

"much of what you are saying is incorrect.
For example earlier you stated outhaul impacts twist. Outhaul impacts lower 3rd sail shape predominantly belly but it has almost zero impact on twist."...
Forum: Deck hardware: Rigging, Sails & Hoisting 16-10-2014, 13:58
Replies: 71
Views: 7,202
Posted By bmz
Re: Main Sail Runner (or not)

"I am desperately trying to avoid using emoticons.
I can't even follow your arguments anymore. Lift of a wing is defined as perpendicular to the undisturbed airflow far from the wing. Is that...
Forum: Deck hardware: Rigging, Sails & Hoisting 16-10-2014, 07:49
Replies: 71
Views: 7,202
Posted By bmz
Re: Main Sail Runner (or not)

"Lift, by definition, is perpendicular to the direction of the air flow."
I am happy that you understand that; because it means that a windward leech will slow a boat down.
"You shouldn't try to...
Forum: Deck hardware: Rigging, Sails & Hoisting 15-10-2014, 15:46
Replies: 71
Views: 7,202
Posted By bmz
Re: Main sail Runner (or not)

I guess I always have an afterthought. I am sure you have seen racing genoas with telltales running from the luff to the leech on both sides of the sail--but you have never seen a main with telltales...
Forum: Deck hardware: Rigging, Sails & Hoisting 15-10-2014, 15:40
Replies: 71
Views: 7,202
Posted By bmz
Re: Main sail Runner (or not)

"You absolutely do not want to have the luff parallel to the wind and the leech parallel to the keel. Can you imagine what the sail would look like on a beam reach? There would be zero chance of the...
Forum: Deck hardware: Rigging, Sails & Hoisting 15-10-2014, 14:28
Replies: 71
Views: 7,202
Posted By bmz
Re: Main sail Runner (or not)

Another point--although the same rules of physics apply to airplane wings and sails, there is a very significant difference: airplane wings do not provide forward propulsion; the lift provided by an...
Forum: Deck hardware: Rigging, Sails & Hoisting 15-10-2014, 13:29
Replies: 71
Views: 7,202
Posted By bmz
Re: Main sail Runner (or not)

When the trailing edge of an airplane wing points down, the wing is actually slowing the plane, but providing maximum lift (when the airplane needs acceleration more than lift, the trailing edge is...
Forum: Deck hardware: Rigging, Sails & Hoisting 15-10-2014, 10:22
Replies: 71
Views: 7,202
Posted By bmz
Re: Main sail Runner (or not)

I just gave you the Newtonian explanation; the Bernoullian explanation is that the lift at the leech is aft.
Forum: Deck hardware: Rigging, Sails & Hoisting 15-10-2014, 10:16
Replies: 71
Views: 7,202
Posted By bmz
Re: Main sail Runner (or not)

BTW, a windward leech always acts as a brake (the resultant force vector is aft).
Forum: Deck hardware: Rigging, Sails & Hoisting 15-10-2014, 10:13
Replies: 71
Views: 7,202
Posted By bmz
Re: Main sail Runner (or not)

if you have not set your traveler to windward, and your outhaul is tight (to flatten your sail for close hauled sailing), the leech should not to windward.
Forum: Deck hardware: Rigging, Sails & Hoisting 15-10-2014, 05:36
Replies: 71
Views: 7,202
Posted By bmz
Re: Main sail Runner (or not)

"I want my top batten to be parallel to the boom at the leech, which means that the sail has a moderate twist to it."

That is hard for me to envision; as I see it, the only way your top batten...
Forum: Deck hardware: Rigging, Sails & Hoisting 13-10-2014, 15:58
Replies: 71
Views: 7,202
Posted By bmz
Re: Main sail Runner (or not)

cwyckham: if you use your vang for sail shape and your main sheet for angle of attack, they are independent; except for close hauled sailing when tightening the main tightens the leech--which is what...
Forum: Deck hardware: Rigging, Sails & Hoisting 13-10-2014, 05:41
Replies: 71
Views: 7,202
Posted By bmz
Re: Main sail Runner (or not)

"You can "vang sheet" (which I've been known to do) where you use the vang upwind, but whether that's a good idea depends a bit on your boom design. If you vang sheet, then you're using the vang for...
Forum: Deck hardware: Rigging, Sails & Hoisting 12-10-2014, 09:01
Replies: 71
Views: 7,202
Posted By bmz
Re: Main sail Runner (or not)

"If you're working up wind and have a traveller you can set the sheet tension and vang for the correct sail shape, then use the traveller to set the correct angle to the wind. When you tack, the sail...
Forum: Deck hardware: Rigging, Sails & Hoisting 12-10-2014, 05:12
Replies: 71
Views: 7,202
Posted By bmz
Re: Main sail Runner (or not)

"My boom vang would not pull the boom down enough to tighten the leech" The only time you should want a "tight" leech is is when you are on the wind and the main sheet pulls straight down, and fully...
Forum: Deck hardware: Rigging, Sails & Hoisting 11-10-2014, 14:17
Replies: 71
Views: 7,202
Posted By bmz
Re: Main sail Runner (or not)

Many modern boats are eliminating the traveler altogether. A boom vang alone does all that a traveler should do (windward traveler positioning produces more heel and less forward velocity vector than...
Showing results 1 to 16 of 16

 
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