Selden Furling Jamming A Bit

Jun 3, 2010
177
Hunter 27-3 Erie
what we found

first, buried in a pile of papers we found the owner's manual specifically for Hunter 27's from US Spar. That was an eye opener for sure. They give VERY specific instructions on how to tune the rig and set things up. One of the issues they discuss is the amount of pre-bend in the mast. The H27-3 rig was designed to be used with a sail that lives on the boom, not in the mast. I believe the specify 16" of aft rake from plumb, measured from the top of the mast with only 1"- 1 1/2" prebend using the "diamond stays". They further broke down the rig tuning specs and said we need to get a Loos gauge and tune each piece of wire to their numbers to minimize bend. The reason is that the furling mandrel inside the mast wants to be straight, with a lot of bend it binds on the inside. Add to that the things others here have mentioned and it seems that getting things just right is a challenge.

We also had a tough time getting the mainsail to feed into the groove in the mandrel. That was further complicated by the wind kicking up with about a third of the sail up. We took the main down for winter storage yesterday and found that it bound up again with about 95% of the sail unrolled. It took two of us to get the last 6" or so of the sail to unroll, what we found was about 10' of the center of the sail was not furled properly and was wrinkled, we aren't positive but we also think it may not have been in groove. Once again, to complicate the process the wind kicked up and it started to rain......it's been that kind of summer.

US Spar suggests dropping the mast, backing off all the turnbuckles and starting to tune the rig completely from scratch in the spring. We hope to do that if we can get the mast down. Turns out it has never been down since 2008 so I hope I can get the turnbuckles free. We are scheduled to do all of the tomorrow however the NWS just issued a gale warning through Sunday........sigh.
 
Jun 3, 2010
177
Hunter 27-3 Erie
Well, here it is, spring in the northeast and I have an update for the group. I did purchase a LOOS gauge over the winter and checked our rigging against the specs given in the Seldon addendum for furling masts. It was wayyyy off, too tight. I followed their specs for tension on all the standing rigging and ended up loosening everything. In particular the cap shrouds were off quite a bit.

Prior to doing this I sighted up the mast and saw that the main halyard was inside the mast at the top and bottom but outside the mast by about 1 1/2" at the spreaders. That's quite the bend and explains why the furling mandrel was hanging up. Once the rig was tuned to the new specs I sighted up the mast again and the main halyard had moved inside.

We put up the main sail yesterday and found a huge difference, it rolled in and out without much resistance at all. We can't wait to get out on the water. It just needs to stop raining......
 
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JamesG161

SBO Weather and Forecasting Forum Jim & John
Feb 14, 2014
7,815
Hunter 430 Waveland, MS
That's quite the bend and explains why the furling mandrel was hanging up
That mandrel ( called the foil) will bend and flex against the inside of your mast when unfurling and wind in the sail.
So alway tough to turn, prebend or not.

Thanks for the follow up and feed back.
Jim...

PS: I have found my mast prebend not to be a problem, but like you, I checked mine.;) I am now in the in-mast furling side of Blessing and not Burden.
 
Nov 28, 2009
495
Catalina 30 St. Croix
You should make sure that there is no mast bend when unfurling or furling. The in the mast track wants to be straight. It can cause jamming otherwise. Also there is a company in Portsmouth, NH that will will wash and coat the sail with a liquid teflon application. The sail will roll much tighter because there is less friction and also unfurl much easier. During furling the boom and mast must be at 90 degrees to each other. With the end of the boom higher. The top of the main will furl sooner and creat the problem you are describing.