Gin Pole for Mast Stepping? Anyone have instructions / images to share?

Thread starter #1
I plan to trailer launch my boat and I will need to get the mast up and down with only human power.
I would like to see other ideas / designs for Gin Poles to do this. I have found very little online. I assume this is a common practice, and it's always better to learn from someone else's mistakes.
Thanks !
 
#2
Mine is 19 feet of the top of a J/24 mast. Shrouds are attached at a point 4-1/2 feet from the top. It’s somewhat heavy, but it’s no problem since mast stepping is a two-person job anyway, and it works great.

It gets stepped over top of the stand-up block for the foreguy to port of the mast partners opening in the deck. Aft shrouds clip on to the stanchion bases at the fwd end of the cockpit with simple snap hooks. Its forestay attaches at the bow and has a 3:1 tackle (like a vang from a dinghy) that is used to snug everything up.

The halyard goes through a turning block at the bottom (right at the deck), then up through one at the top and back down. This way, the person doing the raising can both pull up from the bottom with one hand and down from above with the other at the same time to raise the mast, which is somewhat heavy. I suggest a ratchet block for the upper block.
 
Thread starter #3
Thanks Vince!
Only way to improve on that would be to add some photos of it in action.
( I know, that's the first thing you're thinking when you have your rig hanging in the air ;-) )

I may do the same but add a winch to the side of the mast, and a cam cleat.
 
#4
The winch isn't needed. Once you're all ready to go, it takes a minute or less to raise the mast. Another couple of minutes to drop it in and put the pins in the lower shrouds and you're done with the gin pole. The two blocks permitting you to use both arms to raise the mast makes a winch unnecessary. Mine's about as deluxe as I've seen.

If I have reason to raise the mast in the near future I'll take some pix. But I don't have any now.
 
Thread starter #5
The winch was more for smooth lowering into the keel step. I suppose a ratchet block performs this task as well.

Do you "hook" under the spreaders, or rig a line to keep it below them?
 
#6
I put a loop around the mast under the lower shrouds, then tie the tail end to one of the spinnaker pole rings. That way you can avoid getting the thing jammed up there with no way to retrieve it. You want the effective lifting point to be as high as possible.
GinPole Halyard.jpg
 
#7
I have a scrap JY15 that is 15", do you think I can use that as a stepping gin pole? Or should I get something that has more meat on it than a JY 15 mast?
 
#8
I would add to the VinceH info that if you use spectra or an old halyard that is good quality for the gin pole shrouds, it keeps the whole rig stable. It gets precarious and your first time you'll be nervous but it works well. Also, tie a line to the loop under the spreaders that you use to lift the whole thing up so you can pull it down once mast is in place. Often it's the same line as used for lifting. I secure it so lifting loop can't rise or fall if that makes sense.
 
Thread starter #9
I know about the "recovery loop" from using a conventional crane. Fortunately I did not learn this the hard way !! I guess you could boat hook it or something.
 
#10
I have a scrap JY15 that is 15", do you think I can use that as a stepping gin pole? Or should I get something that has more meat on it than a JY 15 mast?
I used a JY 15 mast from an old boat twice on my J/24. The problem is a lack of a lower set of stays which means the mast bends and looks like it's about to buckle. Also, the rivets in the spreaders (especially on an older JY mast which ours was) can't handle the load. The reasons we only used it twice were because it bent a scary amount and a spreader broke under the strain. I got tired of that show really quickly bought a 20 foot section of aluminum pipe from a friend in the construction industry for $100. I think he gave us a "friend price" because it was a lot lower than other sellers but you could probably still find a piece of aluminum in that price range. The aluminum pipe is heavy but we cut it down to 17 feet to lighten it and make it easier to handle. Having a purpose built gin pole is great because I've preset all the stays so it's simple to clip the stays to a pair of stanchions and the bow. I put a system similar to a boom vang on the fore stay of the gin pole to tension it and keep it stable. If you can find a more durable dinghy mast or an old broken keelboat mast that you could get for less than a strip of aluminum then I recommend because most warehouses sell aluminum in 20 or 25 foot sections, which is several feet more then you need. Either way from experience I strongly oppose the JY 15 mast.
 
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#11
I think your 15 inch :)... I suppose you mean foot... mast will be too short. And I'm not surprised that James says the JY mast bowed a lot. For purposes of lifting your mast upright when raising, you want to lift from a point near the spreaders. That's ~17-1/2 feet from the butt of the mast. So you need a pole to lift it higher than that. My extra foot and a half (19' gin pole) is hardly too much. The point is not to have the thing hanging horizontally in the air of course, but to get it vertical. Once you've lifted it 18 feet so the butt is clear of the deck, you'd like a little slack so you can maneuver it around to drop it in.

In the photo of my halyard above, the loop goes under the lower shrouds, NOT the spreaders. If you were to put it above the shrouds, you'd still need a ladder to get the loop off after pinning the lowers at the chainplates (which you really want to do before removing that halyard). And you don't want to pull the loop up tight under the shrouds. It could still get stuck. The tail ties to the spinnaker ring, and that's where the lifting force is. The loop is just to move the balance point up to near the spreaders. I could have made my loop smaller / more snug, but never did because it works fine as is.

At least that's my take on things!
-V
 
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