[bolger] Re: Plans for Storm Petrel?
- If you mean the boat, not the bird, search for "storm petrel" to find
my (and others') earlier postings in the group, most recently #3304.
Here is the link again to Chuck Merrell's site for Phil's DIFFERENT
BOATS chapter on Storm Petrel in Adobe Acrobat .pdf format:
There are also a couple of pics in the vault of Marc Lander's
spritsail-sloop-rigged Storm Petrel in San Francisco, as well as my
sketch of a modified (cuddy top and "eye" deadlights) one.
david ryan <davi-@...> wrote:
> FBBB --
> Thanks for the lesson. It makes me rather curious about the boat. Any
> online pictures/drawings?
- I know the following is a long post, but it seems relevant to the
recent discussions of the Storm Petrel and of rigs. I quote below from
two messages I received from various Newlands (I've lost track, or
possibly just one) of Swallowboats.
"The dipping lug is a fantastic rig in many ways. Our designer is a big
fan of Phil Bolger! However, I have sailed her extensively with the
dipping lug and tacking is not the main problem in my experience.
Because the sail is so small (70 sq foot, as opposed to a few hundred sq
foot in the trad fishing boats) it can be dipped by unhooking the tack
and flicking the throat of the sail round the mast, then re hooking. It
does take longer than a normal rig, and is quicker with two, as the
other person can move the sheet block to the other side of the boat,
whilst the crew man is dipping.
In my experience the worst feature of the rig is that it is not very
stable when running in a blow. Bolger says it is docile....hmmm... maybe
it is when you have a few tonnes of lead in your keel, as his live-
aboard has. On a small dingy, the twist in the sail causes rythmic
rolling which nearly capsized me the other day! In addition to this, if
the sail is let out too far, the boat can capsize the "wrong" way, that
is too windward. obviously the sheets would be knotted to prevent this,
but it still feels out of control when running to my mind. Having said
this, It was approaching a force 7 and on a broad reach I am sure I had
her almost planing!, which for her double ended hull form is pretty much
I thought about adding some form of loose footed boom from the mast to
the clew, but concluded it would get in the way a lot when dipping. I
have yet to do the experiments on this though, and if you are
interested, I will get back to you, hopefully with photos.
At the moment I am sailing her with a balanced lug rig, which is
superbly controllable, with an adjustable outhaul, and temporary full
width, variable thickness battens.
She performs well under this rig, and we have some photos at the
developers, which we will post on the website as soon as we have them
> > http://www.swallowboats.demon.co.uk/storm-petrel.htmWith reference to the lug rigs...
> > A double ender by a UK designer Nick Newland of Swallowboats.
The fully battened sail definitely improves the performance somewhat,
especially when sailing on the "wrong" tack. The battens help to hold
the shape over the mast. The tension in the foot of the sail (outhaul)
is fairly important, but we are also looking at some different ways of
easing the problem. Aerodynamics tells us that there must be a loss of
efficiency on the wrong tack, but to be honest, I have not noticed it
myself when sailing.
In light to moderate winds I can reliably tack the rig through 80
degrees, though the last 5 on either side tend to be a bit slower. In
stronger winds, the head of the sail gets blown too much to leeward
meaning that the boom has to be sheeted almost to the centreline in
order for the top of the sail to be working. This twist in high windsis
a problem, but we are experimenting with different cuts of sail to see
what can be done to address this problem.
Unfortunately, test conditions here on the West coast of Wales have been
far from perfect over the last month or so, and it has been difficult to
obtain much meaningful test information.
We have far from given up on the dipping lug rig, but do feel that it is
not giving it's full potential yet. In theory, it should perform
superbly, and this is what we are working towards!