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/uploads/2020/07/Product-Flyer-162-302.pdf

https://pdf.nauticexpo.com/pdf/naiad-dynamics/multisea-ii-stabilizer-control-system/25361-15823.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.

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.

Absolutely beautiful boat!

Was the 18" x 28" block the only hull reinforcing required. No glass work?

David

Comodave said:

Absolutely beautiful boat!

Click to expand...

Thank you!

DavidM said:

Was the 18" x 28" block the only hull reinforcing required. No glass work?

David

Click to expand...

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.

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/corporate-history/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.

Beautiful boat, and hull! Can you post more close ups of the hull?

And 4 heads?!?!?

w8n4sun said:

Beautiful boat, and hull! Can you post more close ups of the hull?

And 4 heads?!?!?

Click to expand...

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"...

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.

w8n4sun said:

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.

Click to expand...

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.

Following your thread with interest....

Excited for you.



From a fellow Hat 58LRC owner.

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?

socalrider said:

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?

Click to expand...

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.

w8n4sun said:

Would love to see close ups of the side and keel/prop sections. That's a lot of boat in that sized hull.
.

Click to expand...

Here you go...as requested....

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.

Gorgeous, very similar to our hull. Looks to ride nice and smooth.

Thanks for sharing.

I would be interested in some photos of the different components after being

un-packaged.

magna 6882 said:

I would be interested in some photos of the different components after being

un-packaged.

Click to expand...

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.

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.....

At least you are seeing progress.

1/19/22 Update -

Trimming and fairing of the support blocks continue. The starboard support block trimming is complete and the port support block is expected to be complete by tomorrow. Then the dry fit with the actuator mounted will be performed. Once the orientation and mounting position of the actuators are complete, the support blocks will be glassed to the hull. West Systems epoxy, fillers, etc will be used for the glass work. Once the support blocks are glassed and cured, then the bolt mounting holes will be drilled and actuator mounted onto the support block. Once actuator is mounted, then the fins will be mounted.

Pics from today....

Fins being primed and will receive 3-4 coats of bottom paint ....

1/20/22 Update -

The support block fairing and shaping is complete. The support blocks haven been temporarily affixed to the hull. The actuators have been lifted onto the boat and staged in the engine room. Interesting factoid... each actuator weighs in at 137 pounds.

Tomorrow and early next week they will be dry fit onto the support blocks to determine correct orientation and if there are any interferences that need to be cleared.

You are making fast progress!

Sure is going quickly isn’t it? Those are some blocks of wood.

w8n4sun said:

You are making fast progress!

Click to expand...

Comodave said:

Sure is going quickly isn’t it? Those are some blocks of wood.

Click to expand...

Yes... so far I am very pleased with the work at Atlantic Yacht Basin. They have a great crew of dedicated and knowledgeable craftsmen.

And this is not the only work being done on my boat and several other boats in the yard ....

Other work on my boat includes... bootstripe refresh...

Replacing dripless packing... PYI Pro series... that wrapped up today,,,

Refresh bottom paint on all the UW metallic components... everything is now sandblasted annd it will receive a coat of epoxy primer before applying ablative...

I had Naiads fitted in 2013. Mine are also the 252, but I have 7.5 sq ft fins. I'm 50' and 30 tons.

Given your length and displacement I was a little surprised when you said 6 sq ft fins. A couple of times mine have been overwhelmed - wind against tide in fairly shallow water. So short & steep seas. I was thinking bigger fin area would be better.....