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Go Back   SailNet Community > On Board > Gear & Maintenance > Preventing sway when unstepping mast
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Thread: Preventing sway when unstepping mast Reply to Thread
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Topic Review (Newest First)
09-17-2011 11:30 PM
afrinus
C27 A-Frame

I used the A-frame design mentioned by Marunio on my First 26 (about 30' mast). Worked great except for a small mishap when we stopped paying attention to the mast while messing around with one of the stays.

The mast started toppling over, but the winch rope caught it. We were able to hoist it back and maneuver it down without further mishap.
As you can see - just four 12' 2x4's, some line (tied at back and front cleats, and the line through the block at the top.

One thing, make sure the line is hoisted above the mid point of the mast when you untie the stays.

When I putting the mast back up though, I will first try to not use the A-frame

My mast step has a set-up that I can use as a hinge (see pic - you can see why the mast had to come down....rotten running rigging and sheaves) - I'll drill through the base, insert a hinge and then "hook" the mast step to this.
I'll prevent the mast from swaying to sides by tethering the stays with line to the chainplates or more likely through my genoa lead cars.

Pivoting the mast at the base, keeping it straight with the lines through the lead cars while lifting from the back and hoisting by the jib stay might work - I hope

If not, I'm pretty sure the A-frame will do it.



09-17-2011 10:18 PM
bljones
Quote:
Originally Posted by Izzy1414 View Post
It helps to marry your 1st cousin .... I lucked out when Trey and Trinity (the twins) came along.
Touche!

Or Threeche, as the case may be.
09-17-2011 10:14 PM
Marunio
A-frame to lift and lower the mast.

I've done the gin pole method using boom as a gin pole on my C&C24 and did not like the swaying as the mast is at the low position (boat in the water). While researching the stabilizing system i found Catalina 27 A-frame and built one for myself. The only difference in my case from the original design was that legs of an a-frame were secured to the toerails instead of chainplates. I am way more pleased with this system as the control of the mast is superb.
There is a very good video showing the system in use on Youtube
Dropping the Mast - YouTube
Hope this helps.
M
09-16-2011 11:39 PM
Izzy1414
Quote:
Originally Posted by bljones View Post
But not all of us have access to carnival sideshows to provide customized manpower.
It helps to marry your 1st cousin .... I lucked out when Trey and Trinity (the twins) came along.
09-16-2011 11:19 AM
cb32863
Quote:
Originally Posted by bljones View Post
But not all of us have access to carnival sideshows to provide customized manpower.
Oh heck BL.... I needed a good laugh this morning, thanks. I need to find a way up your way some time.... I'll bring the libations.
09-16-2011 10:32 AM
bljones
Quote:
Originally Posted by Izzy1414 View Post
...I have three legged guys on each side of the mast....
But not all of us have access to carnival sideshows to provide customized manpower.
09-16-2011 10:03 AM
cdhickey Thanks for the comments! Lots of things to think about there. I think i'm going to go ahead with the bridles for extra support at least until I get a feel for stepping and unstepping. I'll try to take a few pictures of my final setup and post them if not too embarrassing.
09-16-2011 12:11 AM
Izzy1414 Just fo be clear (or at least clearer), my system has no lumber at all, just rope and nylon webbing (tie down straps for the upper adjustable legs). No need for any ridgidity as all legs of the bridle are in tension.
09-15-2011 04:59 PM
SHNOOL You guys have me wondering if my A-frame might be better built with just 2 pieces of lumber, and bolts/straps around my stantions to keep them from kicking out/moving. Hmmm. Gears grinding now. I'll take a picture, since I have to do it this weekend, and let you know how I did.

By the way, we got the mast up, just the 2 of us... but first me lifting it and placing it on the end of a 4x4 post with a yoke on it (8 feet up).. Meanwhile the mate grabbed the jib halyard (or was it spinnaker - no matter) and she yanked on the halyard as I aped the mast up. My boat is shorter than yours, but has a relatively heavy mast for it's size.

This worked, but our first attempt resulted in me letting it lose, and nearly getting slammed by the mast as it fell down onto the stern lifeline, pulling my poor wife halyard, rope burn and all.

I am REQUIRED to come up with a better way then that, she banged her arm good on the bow pulpit, and had significant rope burns. Meanwhile my shoulder was bruised and I darned near got smashed by a VERY expensive mast (mast survived nicely).
09-15-2011 03:40 PM
Izzy1414
Quote:
Originally Posted by okawbow View Post
I use a piece of 1/4" chain shackled to 2 of the stantion bases on each side of the mast. The length of the chain is adjusted so that a halyard attaches at a point even with, and the same height as the mast hinge point. That keeps the mast from falling to the side.
If I'm reading this correctly, my system is similar and works well. I have three legged guys on each side of the mast. One leg attaches to a stanchion base forward of the mast and one to a stanchion base aft of the mast and the third to mast cleats about breast high. The three legs intersect on a plane with the mast base where it pivots. Make it out of appropriately strong line and make at least one of the legs adjustable on each side. It is a lot easier to stow than a rigid a frame and much easier to construct. And I would suggest using this or some other form of mechanical aid even if you do have enough man power to do without. People tend to let go of things at the most inopportune times.

Oh, and I use my jib halyard in conjunction with a gin pole and block and tackle (my soft boom vang) to lower and raise the mast.
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