Malahini performance

Designs for inboard or outboard power

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PeterG
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Re: Malahini performance

Post by PeterG »

Nicely done! Per the Malahini plans the spray rails run full length to the transom but the bottom edge of the spray rails are flush with and same angle as the bottom for the aft third or 2/5 of the hull length. Meaning what you installed is just exactly what you needed :)
Murphy's Law: Anything that can go wrong, will go wrong.
Griffin's Law: Murphy was an optimist.

Mike Yelverton
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Joined: Sat Dec 25, 2010 7:00 am
Location: Aldie, Virginia

Re: Malahini performance

Post by Mike Yelverton »

Nice job with the spray rails. I have finally decided to mount them on my Riviera after too long a time of getting everyone wet every time I come off plan.
Spray rail dimensions and shape were not in my Riviera plans. I would appreciate any suggestions from others who have done a similar boat. I would think Tahoe might be a good example.I have already molded up some lumber and am sizing up the job.
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Bill Edmundson
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Re: Malahini performance

Post by Bill Edmundson »

Mike

Mine go full length. The bottom edge in perpendicular to the sides at the chine until the widest point. Then I started rolling them until the until the bottom is parallel to the water surface.

Bill
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
Tahoe 19 Build

footer
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Re: Malahini performance

Post by footer »

Mine follow the chine all the way and I have very little issue with spray. Although my sister did get soaked in the back when I hit a wave in a tight turn. So, my intentions are to put the one towards the back like yours too just because I like the look and I want it to double as a rub rail.

Mike Yelverton
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Re: Malahini performance

Post by Mike Yelverton »

Thanks for your reply.

What I think I have decided is that I can come back later and extend the spray rail all the way aft if I think that is necessary, but I don't. So I will carry it along the chine from the bow to a point just shy of mid ship. That will be a 8'6" length piece. I kept resizing until I convinced myself that a 1.25" quarter round with some round over on the bottom outside edge will do the job. I was toying with creating a cove bottom on the rail bottom so that water off the hull bottom would gradually be forced in another direction. I have decided that its not worth the effort. Although that's a fun table saw exercise.

Not sure I understood Bill's explanation that required the "rolling" of the bottom edge. I think that comes natural with the perpendicular angle of the piece as it goes aft and the chine angle transitions relative to the hull.

One more thing for me is that 1.25" is too much to bend as needed. So I plan to steam. Should be fun.

Also, I don't wish to hijack this thread. But I'm unsure how to cast out a new question on this forum. Any instruction on that is appreciated.

Thanks Team Glen-L builders

Mike

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Bill Edmundson
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Re: Malahini performance

Post by Bill Edmundson »

From the stem the rail actually turns down. This turns the water down adding lift. As the boat get narrower the rail gets flatter throwing the water out away from the boat without adding drag.

Bill
Mini -Tug, KH Tahoe 19 & Bartender 24 - There can be no miracle recoveries without first screwing up.
Tahoe 19 Build

Biss
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Re: Malahini performance

Post by Biss »

I stopped short of going all the way to the stem. They actually stop before going above the painted water line. We have been staying dry. Only time we get some spray is if we hit a really big wave.
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Hercdrvr
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Re: Malahini performance

Post by Hercdrvr »

At the Gathering last weekend I was getting some water in the boat over night. When I got home I took everything out and put the garden hose in the boat and watched for the leak. Found it up near the bow in a deep scrape that had gone through the fiberglass.
To fix it, Im sanding inside and out getting out any damp wood. I’ll seal it with epoxy, glass the outside and put a butt block on the inside.
Matt B
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Hercdrvr
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Re: Malahini performance

Post by Hercdrvr »

Butt block is glued down with plenty of PoxyGrip. One layer of fiberglass on the outside of damaged area. It will take 2 or 3 layers of glass to fill the gap.
It’s probably worth doing regular bottom inspections. Any scrape that goes deeper than the cloth will allow water to start soaking into the plywood.
Matt B
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footer
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Re: Malahini performance

Post by footer »

Sorry to hear of the damage. On our lake there is always something floating in the water. Looks like your on the right track to fixing it.
Good luck.
Keep Smiling. :)
Tom

Hercdrvr
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Re: Malahini performance

Post by Hercdrvr »

footer wrote:
Thu Sep 19, 2019 3:01 am
Sorry to hear of the damage. On our lake there is always something floating in the water. Looks like your on the right track to fixing it.
Good luck.
Keep Smiling. :)
Tom
That’s another beauty of building your own boat, I know a guy who can fix it.
Matt B

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DrBryanJ
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Re: Malahini performance

Post by DrBryanJ »

Matt, any idea how it happened? Did you hit something in the water? Did it happen when you beached her?
Bryan

Building a malahini "Mona Lisa"

My wife said "If I build a boat, she's getting a divorce."
We're still happily married, but now she just wants "the dam boat out of the garage."

Hercdrvr
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Re: Malahini performance

Post by Hercdrvr »

DrBryanJ wrote:
Thu Sep 19, 2019 7:49 am
Matt, any idea how it happened? Did you hit something in the water? Did it happen when you beached her?
Bryan, I don’t know how it happened. In the center of the leak is a bronze screw. I suspect it was a defect during construction. I probably floated the fiberglass over the counter sunk screw without filling it properly. Then the unsupported glass cracked and allowed water to intrude softening the plywood and then time did the rest of the work.
We’ll be back on the water this weekend.
Matt B

hoodman
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Re: Malahini performance

Post by hoodman »

You were asking me if I had water in my bilge at the gathering. I checked later and there wasn't any. Good thing you caught it early.
Matt

Building a Geronimo......!
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Hercdrvr
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Re: Malahini performance

Post by Hercdrvr »

I’m making a change to my trim tabs. I have the smallest size (up to 14 ft boat) on there now and they are mounted in tight to the motor. I did this to clear the swim step. They put off lots of spray and disturb water flow to the prop in a steep turn. The plan is to mount the next larger size father outboard and cut the swim step to allow the cylinder to mount.
The tabs are effective, the boat planes astonishingly quick and I can trim up until the boat has that floating on top of the water feeling at 40mph but I think I can do better. Lake test later this week, stand by for results.
Matt B
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Current tabs and location
Current tabs and location
Lots of spray from trim tabs
Lots of spray from trim tabs

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