The shortness is generally related
to the unstayed mast. An unstayed mast rapidly gets heavier and
more expensive as it gets taller. People compensate for this by
greater sail area. Roger Taylor for example runs a sail that has
almost 50% more material than the normal sail for his boat. He
can get away with this because reefing is instant and easy, and
each batten is a reef point. Ming Ming II will ghost along in
almost no wind as a result.
With a multihull, capsize is a serious concern, and that is a case for keeping the aspect ratio lower. On a monohull, heeling is a "safety valve". On a multi if it heels significantly, you are already in trouble.... it's in the process of going over. They have training programs specifically for sailing cats for just this reason.......
H.W.
On 06/05/2018 08:41 AM, Michael Gehl mike@vail.net [harryproa] wrote:
With a multihull, capsize is a serious concern, and that is a case for keeping the aspect ratio lower. On a monohull, heeling is a "safety valve". On a multi if it heels significantly, you are already in trouble.... it's in the process of going over. They have training programs specifically for sailing cats for just this reason.......
H.W.
On 06/05/2018 08:41 AM, Michael Gehl mike@vail.net [harryproa] wrote:
...
| Also, with a junk rig, since the foil plan (sail plan) usually sucks, aerodynamically, the foil profile (airfoil profile) assumes greater importance, and location of max. draft means a lot more.
Interesting. Do you think the profile contributes more than sail size?
Given that one can double sail size to make a higher performance sail, could they instead double profile performance and keep the same size sail?
Didn’t mean size - should have been clearer, I was referring to aspect ratio. I think junk rigs tend to be short because they hoist too much hardware and lines (and weight) aloft.
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