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Av-Mech

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12JC-A install question
« on: November 30, 2019, 08:21:39 AM »
Friends,

I have a Berkeley 12JC that I bought to install in a wooden boat.  The boat is a Glen-L Rampage that is designed for a jet pump but the plans provide almost nothing useful concerning pump installation.  While I'm a ways out from actually doing the install I like to plan ahead for things I'm not totally educated on.  My only real issue in understanding the install as follows:  The bottom of the boat is 1/2" thick ply with a 12" wide keel that at the centerline is 2.125" thick (plus 1/2" bottom) and has a 12 deg deadrise. 

1.  In reading the Berkeley install information, a number of options are presented for positioning the intake forward or aft depending on the angle of the transom, my transom has 0 deg angle relative to the keel which is not a choice when determining where to cut the intake hole forward of the transom?  I do not totally understand my distance from the transom forward for cutting the hole?  Having never installed one before, I need some advice.

https://www.berkeleyjet.com/Instructions/150-H02155.pdf

My choices are 9 to 16 degrees

Thank you for any help you may provide.
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Flusher

  • Karma: +84/-0
Re: 12JC-A install question
« Reply #1 on: December 02, 2019, 06:49:59 AM »
I have some questions before I can make a thorough recommendation.

1.  Are you describing a delta pad style hull?  Could you please post some pictures of either the hull or blueprint so I have a better understanding of what we are working with?

2.  This is a glass over wood construction hull?

3.  I'm assuming you are trying to use the Berkeley transom cover?

4.  You are using a Berkeley intake?  Which one, for flat or round keel?

Regardless of the above, I would set the intake as far aft as possible.  Basically, you will end up with 1-inch of keel remaining between the transom and the cutout for the jet intake, for a 360-degree bond.

If this is a wood/glass construction hull, I would strongly emphasize cutting the wood back from the intake by at least 1 to 1.5-inch all the way around the opening in both the keel and transom.  Bevel and feather the edge of the wood all the way around.  Then laminate glass over both surfaces, sandwiching together at the edges.  The beveled and feathered edge should be far enough away from the intake so that the bonded flange sits flat on the glass only.  You don't want water creeping into the wood.  If you have an exposed edge of wood, no matter how well you epoxy the intake in, you will get water intrusion and rot.
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Flusher

  • Karma: +84/-0
Re: 12JC-A install question
« Reply #2 on: December 02, 2019, 01:18:20 PM »
One more question, are you opposed to making transom plates, instead of using the transom cover?
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"I want to roll with my brother Joe" - Joe Bateman - January 29, 1950 ~ November 27, 2013

 


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