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Date Posted: - Friday - 08/11/06 - 3:29pm
Author: Randall
Subject: Mast Rake Question
What affect on sailing efficiency does a small amount of mast rake have?
Context: the spreaders on Murre's main mast have always swept aft rather than projecting straight out. Since putting the sticks back in last month, I've been playing with the tune of the rig and am coming to the realization that her masts are perpendicular to her waterline rather the 85* angle (5* rake) implied in the M31 drawing on the MOA site. (Using the waterline on the drawing as true, draw a line straight up through the base of the main mast to its head. When you get there, there will be roughly 5* of difference.)
So, it appears our boats were designed with a small rake in the masts.
Why?
RR
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Mast Rake -- Kathy Campbell SHADOW 323, - Thursday - 08/17/06 - 1:48am
Hey Joanna & Randall,
I'm really looking into the sail plan of our Mariners. As we all know, the boats really balance out. It's so fun to hear the panic when we get up and leave the helm unattended, when we have guests aboard, we're so bad. I've been wanting to take the wheel off and put on a tiller, cause I think you can feel the boat better. The wheel can hide the fact that the boat maybe fighting lee or weather helm, and with a tiller you'll know what's happening. Also, with my new bowsprit I'd like to see what would happen to the balance if the bowsprit were a bit longer? While the masts were still stepped I ran a plumbob from the top of the main mast and the rake on SHADOW was 10". Now, there most certainly will be flack from the better half, when I put that tiller on. So I've planned on increasing the grog allowance for awhile to keep the peace down here.
Your Southern Neighbors, Bill & Kathy
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"look ma, no hands!" -- Randall, M31, Murre, - Thursday - 08/17/06 - 7:14pm
Ha! Kindred spirits we must be!
I too get mischievous pleasure, especially while single handing, from setting the wheel and then moving to a perch on the propane tank box or further forward on the cabin. From here I stare out philosophically over the rushing waters and wave with practiced nonchalance at the passing boats, as if to say, “What, you can’t do this? Why, I thought it was normal.”
Such stares!
A few times and when I can tell the way forward is clear and a passing boat will not pass too close, I’ve set the wheel and shinnied down below. Once the captain on the passing boat was so startled to see an empty cockpit on Murre he stood up hard and whacked his head on his main boom. This is a bad bad practice—shameful that I should take advantage of the good Samaritans who think Murre might have a man overboard. Thus I was told by the Coast Guard, when once I came on deck after such a shenanigan to find them hauled up my bum. They aren't known for their great gobs of humor.
I hear you re the tiller. But how will you sit and steer and see forward over the cabin top? I’ve never found the lack of feedback a problem when steering (although, like you, I like a tiller).
Good to know the rake is 10 inches. That looks about right given my little drawing marks. I’ve been pondering how to adjust the mast to the correct position, but your plumb bob idea is perfect. Thanks.
Happy sailing to you two...
RR
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hands free sailing -- Craig M31-25 Hibou, - Sunday - 08/20/06 - 1:30am
I'm impressed to hear you can balance your boats well enough to leave the wheel. I haven't been able to leave the wheel unattended long enough to trim a sail. That is until two weeks ago when I installed an autohelm. I made my first single hand outing, on Hibou, last night, what fun! Without any crew aboard I had a chance to really get in tune with the boat. The hightlight of the afternoon was being kicked back in the cockpit making 6.25 kn with a 10 kn breeze, despite the city of banicles on the keel. The autohelm needs some adjusting, and a lesson in auto tacking, but otherwise works great.
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What kind of autopilot did you get? -- Randall, - Monday - 08/21/06 - 8:45pm
I've not acquired one yet.
And don't think we're such geniuses. In a good breeze and close hauled it's easy. Off the wind, Murre can be a squirrely as any boat.
RR
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Autohelm -- Craig M31-25 Hibou, - Monday - 08/21/06 - 9:36pm
I got a Raymarine SmartPilot. The system is made for a pedestal mounted stainless steel destroyer wheel so needs modification to fit. Would you like photos?
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of your install, yes. -- Randall, M31, Murre, - Monday - 08/21/06 - 9:48pm
fdsa
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photos -- Craig M31-25 Hibou, - Monday - 08/21/06 - 10:37pm
I'll get the pictures Wednesday, tomorrow's schedule is rather full.
Here's the link to Raymarine's web page:
http://www.raymarine.com/raymarine/ProductDetail.asp?site=1§ion=2&page=88&product_id=3686
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got photos, can't deliver -- Craig M31-25 Hibou, - Wednesday - 08/23/06 - 7:12pm
I got the photos but my PC crashed last night. I'm using my son's PC which doesn't have the program for the camera. I'll get those pic's to you, yet.
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