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PostPosted: Sun Aug 21, 2011 10:23 am 
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Joined: Sun Aug 07, 2011 3:57 pm
Posts: 29
Location: Ottawa, Canada
A quick follow-up to a previous post about the spray rails on our Tahoe. We have done two sea-trials with different spray rail setups, thought I'd pass along the results.

Without the spray rails, getting the Tahoe up on plane and back off is a bit like those "log-rides" you took when you were a kid. Soaked. And not in a good way.

Taking a lead from the previous post, we set up a spray rail along the chine made of Mahogany about 3/4" proud of the hull, the bottom edge of the rail is bevelled slightly (10deg). Bedded with 3M5200, fastened with 1-1/2" silicon bronze screws, capped with mahogany plugs, stained and epoxied.

In our first setup, we set the bow-end of the spray-rail back about 10" from the stem to allow for the cutwater. This took out about 80% of the spray but it is amazing how much still came from the remaining 10".

For the second trial, we spliced in an additional 10" of rail so the the rail runs from Stem to Stern and tapered the bow-end with a belt sander so that it came to a point at the stem. 100% improvement, no spray at all. Even the odd splash that came over the bow at idle was deflected away from the topsides.

Bottom line: Spray Rail is not optional and must run from Stem to Stern if you want to stay dry.


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PostPosted: Sun Aug 21, 2011 12:07 pm 
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Joined: Sat Aug 13, 2011 9:28 am
Posts: 13
Location: Eaton Rapids, Michigan
Can you show us a before and after picture? Thanks :D


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PostPosted: Sun Aug 21, 2011 3:21 pm 
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Joined: Mon Apr 11, 2011 8:39 am
Posts: 196
Location: Abu Dhabi, UAE
Would love to see photos as well!

Thanks...


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PostPosted: Mon Aug 22, 2011 11:11 am 
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Joined: Sun Aug 07, 2011 3:57 pm
Posts: 29
Location: Ottawa, Canada
yeah, sorry about that, pics aren't on the machine that I'm using to post this. Will grab tonight and post asap....


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PostPosted: Wed Aug 24, 2011 3:14 pm 
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Joined: Sun Aug 07, 2011 3:57 pm
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Location: Ottawa, Canada
Back at the right PC.

Here's a drawing of the spray-rail profile that we used. The rail is made from stock Mahogany with angles cut on a tablesaw:

Attachment:
File comment: Cross Section of Spray Rail
spray rail.jpg
spray rail.jpg [ 8.06 KiB | Viewed 880 times ]


Prior to attaching, the chine looked like this:

Attachment:
File comment: Chine before rail was attached
Before.jpg
Before.jpg [ 102.52 KiB | Viewed 880 times ]


Here are two shots of the boat after the rail was attached (will attach second in next reply)

Attachment:
File comment: Chine after rail was attached
After 1.JPG
After 1.JPG [ 72.73 KiB | Viewed 880 times ]


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PostPosted: Wed Aug 24, 2011 3:16 pm 
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Joined: Sun Aug 07, 2011 3:57 pm
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Location: Ottawa, Canada
Here's a view of the rail from the bow. We "tapered" the bow-ends of the rails to make them look better.

Attachment:
File comment: View of spray rail from bow
After 2.JPG
After 2.JPG [ 63 KiB | Viewed 878 times ]


I don't have (or can't find) picture of the first attempt with the spray rails set back from the bow by 10 inches or so, but I think you get the picture.


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PostPosted: Sat Aug 27, 2011 7:40 am 
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Joined: Mon Apr 11, 2011 8:39 am
Posts: 196
Location: Abu Dhabi, UAE
Great! thanx for the pics Corey!

I ended up making ones as per the plans and will install after epoxying.

Cheers
Zane


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PostPosted: Wed Sep 07, 2011 5:35 am 
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Joined: Wed Jun 13, 2007 7:54 pm
Posts: 208
Location: Crestview,FL
DONT TRY IT WITHOUT SPRAY RAILS It will be that log ride.I ran my Tahoe without for 2 years . Guess I was a slow learner.


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