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Old 01-14-2022, 02:19 AM   #1
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1976 Hatteras 58 LRC Stabilizer Install

This thread will document installation of a NIAID Stabilizer System in a 1976 Hatteras 58 Long Range Cruiser.

I chose the NIAID system for multiple reasons:

- History and Reputation of the System and Company
- Tried and True Technology
- Worldwide Support for Maintenance and Support
- Comparable Price of Other Systems
- USA Engineered and Manufactured System

The system consists of the following Major Components:
- Model 252 Electro-Hydraulic Actuator
- 6 Sq Ft Fins
- Oil reservoir with Integrated Heat Exchanger'
- Engine/Gear Driven Oil Pump
- 18" x 18" x 5" Mahogany Hull Reinforcing Blocks
- Center Lock Control Valve
- DC-DC Converter (10-36 VDC input - 24 VDC Output)
- Multi Sea Controller

https://www.naiad.com/wp-content/upl...er-162-302.pdf

https://pdf.nauticexpo.com/pdf/naiad...361-15823.html

System install began on Tuesday 1/13/22 at Atlantic Yacht Basin. They will be performing the complete install.

This is the initial thread and I will post up progress and it goes along.
Attached Thumbnails
Railway 01.jpg   Railway 02.jpg   Railway 03.jpg   Hull Hole Port Inside.jpg   Hull Hole Port.jpg  

Hull Hole Stbd.jpg   Stabilizer Crate Parts Overall 05.jpg   Stabilizer Crate Parts Support Block 04.jpg   Stabilizer Crate Parts 01.jpg   Stabilizer Crate Parts Oil Reservoir 03.jpg  

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Old 01-14-2022, 02:26 AM   #2
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Boat was hauled on 1/12/22. That day the crew had already performed reinforcing block dry fit-up and drilled pilot hole for find actuator location. The final hole is 6-5/8" for the fin shaft.

1/13/22 - Grinding inside and outside of the fin shaft hole to accommodate the support block on inside and the SS plate on outside.

1/14/22 - Removal of all four Vac-U-Flush heads that were located above the area for the actuator. These will be reinstalled back into original location once actuators are installed.
Attached Thumbnails
Hull Hole Port Cutting.jpg   Hull Hole STBD Location Inside.jpg   Hull Plug 01.jpg  
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Old 01-14-2022, 03:30 AM   #3
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Absolutely beautiful boat!
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Old 01-14-2022, 06:49 AM   #4
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Was the 18" x 28" block the only hull reinforcing required. No glass work?

David
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Old 01-14-2022, 08:51 AM   #5
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Quote:
Originally Posted by Comodave View Post
Absolutely beautiful boat!
Thank you!

Quote:
Originally Posted by DavidM View Post
Was the 18" x 28" block the only hull reinforcing required. No glass work?

David
The 18" x 18" reinforcing blocks will be glassed in. Today grinding the interior bilge area where the reinforcing blocks will be glassed in will begin. Once that area is faired flat, then the final dry fit-up of the blocks will be confirmed and the glass work will begin. The 5" height of the support block may be modified depending upon how the actuators fit into the space.
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Old 01-14-2022, 09:05 AM   #6
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A little history on stabilization of the boat..... the boat originally had stabilizers from the factory in 1976. It was designed with one of the first fin stabilization systems manufactured by Sperry Marine Corp which designed and manufactured the original gyro stabilization system for boats and the first install of the system for two U.S. Navy ships in the early 1900's.

https://www.sperrymarine.com/corpora.../sperry-marine

At some point of the boat's history, the original stabilization system became uneconomical to service and repair and the entire system was removed from the boat.
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Old 01-14-2022, 09:40 AM   #7
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Beautiful boat, and hull! Can you post more close ups of the hull?

And 4 heads?!?!?
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Old 01-14-2022, 09:43 AM   #8
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Quote:
Originally Posted by w8n4sun View Post
Beautiful boat, and hull! Can you post more close ups of the hull?

And 4 heads?!?!?
Thanks! Yes, the Hatteras 58 LRC came standard with 4 heads. One for each of the three state rooms and a Day Head located forward of the salon and aft of the pilot house.

Specifically what area of the hull are you interested in? .... she has a LOT of "hull"...
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Old 01-14-2022, 09:58 AM   #9
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Would love to see close ups of the side and keel/prop sections. That's a lot of boat in that sized hull.

Btw we have the same model on ours and it works excellent, even in beam waves to 10' so far.
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Old 01-14-2022, 10:12 AM   #10
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Quote:
Originally Posted by w8n4sun View Post
Would love to see close ups of the side and keel/prop sections. That's a lot of boat in that sized hull.

Btw we have the same model on ours and it works excellent, even in beam waves to 10' so far.

Understood on the hull pics... I had the boat pulled in October in Mystic, CT for a bottom job.. change out props and cutlass bearing replacement. I have quite a few pics from that work and will locate and post those up.

FYI, the Hatteras 58 LRC weighs in at around 50 Tons fully loaded, so she is a lot of boat in that hull.

Good to know the NIAID system is working well for you. I expect a similar result.
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Old 01-14-2022, 10:41 AM   #11
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Following your thread with interest....
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Old 01-14-2022, 10:53 AM   #12
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Excited for you.



From a fellow Hat 58LRC owner.
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Old 01-14-2022, 11:35 AM   #13
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Thanks for posting! I love those big old Hatteras LRCs & yours looks gorgeous. 4-71s?

I assume when the old fins were removed they glassed in the holes - are the new fins going in the same spot?
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Old 01-14-2022, 01:52 PM   #14
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Thanks for posting! I love those big old Hatteras LRCs & yours looks gorgeous. 4-71s?

I assume when the old fins were removed they glassed in the holes - are the new fins going in the same spot?
This old girl has 671's... with N55 injectors putting out 173 HP per side.

Original holes were glassed over. When the new holes were drilled we could see where the repair was for the original holes.
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Old 01-15-2022, 10:12 AM   #15
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Quote:
Originally Posted by w8n4sun View Post
Would love to see close ups of the side and keel/prop sections. That's a lot of boat in that sized hull.
.
Here you go...as requested....
Attached Thumbnails
Stern 01.jpg   Stern 02.jpg   Starbaord Stern Prop.jpg   Starbaord Stern Prop 03.jpg   Starbaord Stern Quarter.jpg  

Starbaord Stern Prop 02.jpg   Port Stern Prop.jpg  
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Old 01-15-2022, 11:28 AM   #16
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1/14/22 Update - The interior spaces have been ground for the glassing of the support blocks.

Had to add some fiberglass to the outside of the starboard side hole to level up the surface to accept the SS outer ring.

Trimming and shaping of the support blocks also underway.
Attached Thumbnails
Support Block Trimmed.jpg  
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Old 01-15-2022, 11:37 AM   #17
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Gorgeous, very similar to our hull. Looks to ride nice and smooth.

Thanks for sharing.
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Old 01-17-2022, 11:22 PM   #18
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I would be interested in some photos of the different components after being

un-packaged.
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Old 01-18-2022, 08:55 AM   #19
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I would be interested in some photos of the different components after being

un-packaged.
Will Do....

1/17/22 Update - Fitting of the support blocks continue. This is a painstaking iterative process. The underside of the support block has to fit the hull shape almost perfectly with no gaps. And for Miss Maggie, the hull in this area is on a curve.
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Support Block Trimmed 02.jpg  
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Old 01-18-2022, 09:53 PM   #20
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Update 1/18/22 - Trial fitting of the actuator to the support block and support block to the hull continued today. Sorry... no pics of substance on the stabilizer install today.

Here's some pics of some of the individual components.....
Attached Thumbnails
Actuator in Box.jpg   Actuator in Box 02.jpg   Actuator in Box 03.jpg   Actuator in Box 05.jpg   Stabilizer Crate Parts Oil Reservoir 03.jpg  

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