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PostPosted: Mon Jun 11, 2012 1:26 pm 
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Joined: Sat Apr 21, 2012 11:01 am
Posts: 6
My son and I just did the strengthening of the front crossbar on a 85 Hobie Magnum. We have been reading the forum and following all of the recommendations for the reinforcement, added the patches on the inside of the hull and the brackets on the outside of the hull.

However on a lot of the threads we read there was reference to a vent hole under the front crossbar. We have looked for the hole and could find nothing on either side. Where are these venting holes located?

Thanks for everybody’s help; this forum has been great for us to find out information.


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PostPosted: Mon Jun 11, 2012 3:12 pm 
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Joined: Sat Jul 23, 2005 10:04 am
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Location: Bowie, MD
If you have a vent hole, it would be in the "saddle" that the front cross bar sits in. You can only see it if you take your front cross bar off the boat. I have three H-18s from various years and none of them have the fabled vent hole. However, my H-17 does have vent holes in that exact spot.


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PostPosted: Tue Jun 12, 2012 8:03 am 
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Joined: Thu Feb 09, 2012 1:48 pm
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I read on the forum that sometimes there was a tiny hole drilled in each inspection port cover or for the pop in covers, the holes for the rope handles allowed the hulls to vent.


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PostPosted: Tue Jun 12, 2012 8:15 am 
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Joined: Mon Oct 18, 2010 11:25 am
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Location: Glen Lake, MI
I have 3 H18's as well. '82 & '85 boats don't have the hole, the '89 does. If i'm not mistaken it's under the front crossbar in the "saddle."


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PostPosted: Tue Jun 12, 2012 8:35 am 
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Joined: Mon Jun 13, 2011 3:45 pm
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Location: Saratoga Springs, NY
My '90 has them (under the front crossbar, like others have said), so it sounds like maybe they were a later addition to the design.

_________________
1990 Hobie 18SX #2077


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PostPosted: Wed Jun 13, 2012 6:44 pm 
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Joined: Sat Jun 21, 2003 7:14 pm
Posts: 455
Location: West MI
My 89 has them. I plugged them for about a week. When you hear a woosh removing a drain plug you know you have a leak free boat, and a problem. Expansion and contraction from pressure in the hulls isn't a good thing. I have PVC vents in a set of 5" ports that are screwed in when not sailing, year round. See the winterizing tips in the Hobie FAQ for a picture of the PVC vents.

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DVL 1989 H-18 Worlds Boat, Magnum Wings & Spinnaker

dale.vanlopik"at"att"dot"net


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PostPosted: Wed Jun 13, 2012 7:24 pm 
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Joined: Mon Jul 14, 2003 7:11 pm
Posts: 4623
Location: Detroit, MI
The first few years of production had them, with the assumption that the holes for the rope handles in the deck ports would be sufficient breathing space.

When people started replacing the port covers with solid ones, that's when the trouble started. So they added the vent under the front crossbar in the late 80's.


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