Hobie 18 leaky mast :: Catamaran Sailboats at TheBeachcats.com

Hobie 18 leaky mast

DarrylLict

Rank: Lubber

Registered: Jul 01, 2009

Last visit: Apr 16, 2010

Posts: 2
Posted: Apr 16, 2010 - 03:30 AM

I've got an ancient Hobie 18 that I managed to capsize last season. The mast pretty much leaks like a sieve and the boat turtled in no time at all.

This particular model has a foam plug at around the point the forestay and shrouds attaches to the mast (what's that point called, anyway?).

Should I try to replace the foam plug to get a better seal or should I just seal the hell out of every potential spot with marine grade silicone?
HULLFLYER

Rank: Mate

Registered: Aug 06, 2004

Last visit: Feb 24, 2024

Posts: 877
Posted: Apr 16, 2010 - 08:03 AM

You may mean comp tip instead of foam plug. While the mast is upright I would drill out one of the bottom rivets that hold the mast base in place and let the mast drain throughly. Then either pop in a new rivet or a ss screw. (I use a ss screw so I can remove on occasions to se if there is any water in the mast.) Then use a good grade marine silicone sealant and seal anywhere and everywhere there is a through mast fitting or rivet, including the mast head and mast base and if you have a comp tip make sure that you take extra time sealing where the comp tip and metal part of the mast meet. There is a lot of flex and bending at this junction. I have seen hobie masts take in rain water at this location and fill with water 5 or 6 feet up the mast.
popeyez7

Rank: Mate

Registered: Apr 26, 2004

Last visit: May 01, 2023

Posts: 398
Posted: Apr 16, 2010 - 09:00 AM

I wouldn't do that yet..... the bottom of the mast (should) have some kind of silicone sealant in the bottom and I think it goes almost up to the mast rotator thinggy or gooseneck. Someone did put it up here on the site~~ let me see if I can find it. Try this~~ http://H-18 Mast Plug Rep…ent - Catamaran Sailing

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~ Vietnam Vet 69-71~ 17 Hobie w/big jib, ~18 Hobie mag,~DN Ice sailor,
and other toys.......
~~ I live in NY state on the north shore of Oneida lake in
Bernhards Bay. ~~~~~~
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popeyez7

Rank: Mate

Registered: Apr 26, 2004

Last visit: May 01, 2023

Posts: 398
Posted: Apr 16, 2010 - 09:07 AM

Also you might want to find out where it's coming in from.
On a calm day take your mast off the boat and take it down to the water and submerge it and look for bubbles. I gotta do that to mine this year. I thought I had it sealed, untill I took it out for the winter~~'drip drip drip' I really don't wanna do the bottom thing yet... Sailins fun and all that but sometimes it can be a pain in the "arse"

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~ Vietnam Vet 69-71~ 17 Hobie w/big jib, ~18 Hobie mag,~DN Ice sailor,
and other toys.......
~~ I live in NY state on the north shore of Oneida lake in
Bernhards Bay. ~~~~~~
--
MN3

Rank: Master Chief

Registered: Jun 20, 2006

Last visit: Apr 06, 2024

Posts: 7088
Posted: Apr 16, 2010 - 09:08 AM

Quotearound the point the forestay and shrouds attaches to the mast (what's that point called, anyway?).

called the Mast tang
popeyez7

Rank: Mate

Registered: Apr 26, 2004

Last visit: May 01, 2023

Posts: 398
Posted: Apr 16, 2010 - 09:43 AM

OK I guess that link didn't wanna work and I can't copy the URL from the properties... Go to 'tech gallery~ go to page 2 "H18 plug replacement"

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~ Vietnam Vet 69-71~ 17 Hobie w/big jib, ~18 Hobie mag,~DN Ice sailor,
and other toys.......
~~ I live in NY state on the north shore of Oneida lake in
Bernhards Bay. ~~~~~~
--
DarrylLict

Rank: Lubber

Registered: Jul 01, 2009

Last visit: Apr 16, 2010

Posts: 2
Posted: Apr 16, 2010 - 04:15 PM

HULLFLYERYou may mean comp tip instead of foam plug.

My boat ia a 1979, so it's ancient. It has a one piece all aluminum mast with no comp tip. I had noticed that the hook at the top was loose. After I turtled it, the harbor patrol came and righted me. This action ripped off the hook, tore up the main sail and ripped one of the jib blocks off.

There were huge oxidized holes where the hook was riveted on. I've fashioned a stainless steel reinforcement plate to cover it and bought a replacement hook from Murray's. I'm aware of the galvanic issues between stainless and aluminum and will take steps to mitigate the problem.

Andrew Scott called the Mast tang

Thanks, I'm a newbie although I've had the boat for over 10 years.
SHayes

Rank: Lubber

Registered: Aug 15, 2009

Last visit: Apr 19, 2010

Posts: 1
Posted: Apr 19, 2010 - 01:34 PM

QuoteThere were huge oxidized holes where the hook was riveted on. I've fashioned a stainless steel reinforcement plate to cover it and bought a replacement hook from Murray's. I'm aware of the galvanic issues between stainless and aluminum and will take steps to mitigate the problem.

This is what I made for the same problem.
MN3

Rank: Master Chief

Registered: Jun 20, 2006

Last visit: Apr 06, 2024

Posts: 7088
Posted: Apr 19, 2010 - 02:56 PM

QuoteThanks, I'm a newbie although I've had the boat for over 10 years.

haha, cool.

I like to say i am the "new kid" on the beach, i have only been sailing 30+ years :)
Dannyski

Rank: Lubber

Registered: Nov 17, 2002

Last visit: Apr 08, 2012

Posts: 25
Posted: Apr 08, 2012 - 10:42 AM

I had water dripping out the masthead of the comp tip from my H18, when I moved it from storage this spring. That needs to be sealed, obviously. I would like to remove the masthead to do a real good job, but don't see how it's attached. Any clues?
I capsized 3 times last season and turtled within 10 seconds, most likely due to taking on water inside the mast. Submerging the mast in calm water to look for bubbles is a good idea. Has anyone added additional floatation media somehow?
DaveW70

Rank: Lubber

Registered: Apr 28, 2010

Last visit: Jul 22, 2017

Posts: 69
Posted: Apr 08, 2012 - 01:09 PM

On a comptip, the rivets for the halyard hook are what holds the masthead in place.

QuoteHas anyone added additional floatation media somehow?

Edited by DaveW70 on Apr 08, 2012 - 03:02 PM.

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Dave Wilson
Hobie 16, Hobie 14
Tampa, FL
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