Sorry Gardner, I was writing that from a pub on my cell phone and was trying to be concise.
P.O.S. is defined as "Piece of $#!%" is a MacGregor Winnebago... great for pulling kids on an inter-tube, camping and simulating sailing. Not much for performance. It has a rotating mast like most Hobie cats. Its tear dropped shape and the boom is mounted on the trailing edge, but its free to rotate as it wants independent of the mast. As such when mine (or a Hobie) tacks the mast will ram over to the other side but its stopped by a... stop while the boom you position as normal. The tension along the foot of the sail makes it go to one stop or the other... there's never any in-between on mine. But since my POS "might" tack through 120 degrees on a good day, the stop is pretty nicely lined up where I'd put it to be setting up the air flow. The following instructions manual show several pictures of the mast and on page 13 there is a picture of the boom attached.
In your case for a wing mast the angle will have to be more accurately placed if your chord is significant (> 2x or 3x the thickness). I've heard of mounting the boom off the mast step (off the deck not the mast), having a loose footed sail and the tension will pretty accurately pull the position of the wing mast to be at the desired position automatically.
Dennis
From: Gardner Pomper <gardner@networknow.org>
To: harryproa@yahoogroups.com.au
Sent: Sat, May 21, 2011 9:25:38 PM
Subject: Re: [harryproa] Rotating masts and wingmasts?
Dennis,
I am not clear. Your "pos" (?) has a rotating mast... is that a wingmast, or a regular round mast? Are you saying that a regular round rotating mast also needs to be rotated seperately from the boom? I had assumed that you could have the boom rigidly attached to the mast and make adjustments on both at the same time. I am not clear on what you are saying.
- Gardner
On Sat, May 21, 2011 at 7:36 PM, Dennis <dec720@att.net> wrote:
My pos has a rotating mast and the boom is attached to it. And you are right ... They have to be controlled separately. On mine the mast has stops. And it goes pretty much stop to stop. I've seen on high end stuff (Moxie comes to mind) they have a set of blocks to position it critically. But since the cockpit is under mast it's not such a pain. Fortunately a cruiser wouldn't typically need to adjust it much.
From: Gardner Pomper
Sent: Saturday, May 21, 2011 6:35 PM
To: harryproa@yahoogroups.com.au
Subject: [harryproa] Rotating masts and wingmasts?[The entire original message is not included.]
I am under the impression that with a wingmast, you need to rotate the
boom independently of the mast, so that the wing is at a steeper angle
to the wind than the sail. Am I correct in this?
If so, that seems like you could no longer have the boom fixed to the
mast and use the mainsheet to adjust the angle of attack. Wouldn't you
need extra lines to trim the wing seperately from the sail, especially
in light air? If so, that seems like a major disadvantage for a
cruising boat.
Thanks for any help clearing up my confusion.
- Gardner
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