58' (17.68m)

yatco anchor icon

Summer Thunder
1999 58' WEST BAY Motor Yacht Sonship 58 Palmetto Florida United States
$675,000 USD

The 1999 58' WEST BAY Sonship 58 Motor Yacht Summer Thunder is a yacht for sale located in Palmetto, Florida, United States.

"Summer Thunder" is a high quality limited production raised Pilothouse Motor Yacht has had only 3 owners.Custom built with doing the "GREAT LOOP" in mind, she has a "fixed structure" height of only 14 feet. This 14' airdraft is achieved by lowering the hinged radar arch, a process accomplished by removing 2 pins and lowering the radar arch and soft top."Summer Thunder" is owned by a pilot and marine engineer who has purchased a larger Marlow Explorer. She is in beautiful condition reflecting the owner's attention to detail and constant maintenance. She has been updated throughout her life and her equipment list is very impressive for a vessel this size with many upgrades including twin 20KW gen-sets, redundant hydraulic systems (for the upgraded stabilizers, thrusters, windlass & davit), twin Cablemaster power cord handling systems, yacht controller an updated electronics.Her interior is roomy with plenty of storage and her large FB and Cockpit allow comfortable enjoyment outside while underway, at anchor or dockside. Her low hour CAT 3406Es @ 800hp each burn only 9.5 GPH TOTAL and offer an extended range of 777nm at 9.5 knots yet cruise her at an honest 21+ knots if desired with a range of over 400nm. Her Novurania tender is equally well equipped with 4 stroke Honda OB, Trim Tabs, Depth & Speed guages, spare prop and boarding ladder. The tender is a 1999 12' Novurania with a 2019 Honda 40hp engine with only 30hrs.

Contact the yacht broker to receive more information or schedule a showing of this 1999 58' WEST BAY Sonship 58 Motor Yacht Summer Thunder yacht for sale in Palmetto, Florida, USA today!

Get more information on this listing

LENGTH 58' (17.68m)
BUILT 1999
BEAM 17' 1" (5.21m)
MX SPEED 25.00 Knots
LOCATION Palmetto, Florida, USA
Get more information on this listing


Vessel Walkthrough

Starting all the way aft there is a spacious molded fiberglass swim/dive platform with high bulwarks as you move forward to the aft deck/cockpit area. High bulwarks keep passengers safely on board this area, and walk-around side decks lead forward to the bow from here to make line handling and docking easy. The cockpit sole is made of easy to maintain fiberglass and there is a huge lazarette beneath the sole that is accessed through a large,lockable hatch. A ladder leads from here up to the boat-deck aft of the flybridge. A hatch forward in the cockpit leads down and into the walk-in engine room with full standing headroom. Dual hinged glass doors open outward to highlight the spacious salon that enables you to also enjoy this outdoor area of the yacht from the inside when an indoor/outdoor feel is desired.The spacious and comfortable salon is just forward of the cockpit/aft deck. Beautiful hand crafted Oakwood stairs lead up to the flybridge and upper helm station, just forward and up only three steps from the salon level. The galley is forward and to port of the stairs with a dinette seating 4-5 is opposite to starboard. The lower helm station and pilothouse is located forward and amidships, port and starboard side doors lead out to the side decks. Forward and down from the pilothouse is a wide comfortable staircase that leads to the owner/guest accommodations. The Master Stateroom is located aft and the VIP guest stateroom is all the way forward in the bow. The second guest stateroom is just aft of the VIP on the port side. Across the companionway from this stateroom is the large guest head with sink, vanity, and stall shower.

Main Salon

Entering the large and comfortable salon, there is a custom made sofa to port, with a matching Oakwood hi/lo coffee and dining table in front. The table has two folding leaves which when employed, enable dining for eight persons. Across, to starboard are two new Ultraleather swivel chairs with a oak side table in between. Just forward to starboard is an oak cabinet with Corian counter tops housing an icemaker, wine and bottle storage rack, and upgraded stereo A/V components (see list below) A color TV mounted on top rounds out the entertainment center.Additional features of the salon include wooden Leveler blinds,custom draperies, dimmer switches on most12V/110V lighting, insect screens for the salon doors, and reading lamps. Central vacuum system throughout.

Entertainment Center Includes.....

New Yamaha Stereo

Niles HD speaker selector with surround sound

Sony CD player with 200-CD storage capacity

KVH Satellite TV system hooked up to 5 TV'S with cable and TV antenna

New DVD Player


The galley features maple and holly wood sole, Corian counter tops, oak cabinetry, double stainless steel sinks with garbage disposal, and port & starboard opening windows with screens.

Appliances include....

Whirlpool size, self cleaning oven

Whirlpool microwave oven

Ceran 4-burner stove/cook top with Broan exhaust hood/fan

GE full size double door refrigerator/freezer with ice and water dispenser


Broan trash compactor

Large L-shape dinette, seats 6, with cabinet built-in for tableware storage

Kitchen-Aid Instant Hot

Black & Decker Space maker Coffee Pot

Master Stateroom

Queen bed and private head with stall shower, en-suite. The stackable Frigidaire washer/dryer and Central vac stored inside a locker forward. Plenty of storage for clothes is provided in a cedar lined walk-in closet, cedar-lined large hanging locker, and plenty of drawer storage space. The MSR portholes open with screens. Oakwood night stands with 110V reading lamps over are built into each side of the beds' mirrored headboard. New 20" HD LCD flat screen TV/DVD/CD with stereo speaker volume controls.

VIP Guest Stateroom

Centerline queen berth with large storage for suitcases underneath and plenty of lockers, cabinet, and drawers for clothes. Reading lamps are mounted above each side of the headboard and custom made optional mirrored oak cabinets were installed by West Bay up over and outboard of each side of the bed for additional storage. New 20"TV/DVD/CD with Stereo volume controls.

Second Guest Stateroom

Over/under single bunk berth with reading lamps, drawers, and a hanging locker.  20" HD LCD flat screen TV/DVD/CD with stereo speaker volume controls.


Novurina 12' 6-person RIB tender with a like new (30 hrs) 2019 4 stroke 40hp Honda outboard motor, trim tabs, spare prop, depth sounder, speed gauge and boarding ladder

Nick Jackson hydraulic davit 1,500lbs

MarQuipt Tide-Ride boarding stairs

MarQuipt side boarding ladder for cockpit and wing door boarding

Muir hydraulic windlass with 300' chain rode

Bruce polished stainless steel anchor

Aft Deck Storage/Line well locker

Fresh and sea water anchor wash down system on bow

Swim boarding ladder

Hot/cold fresh water shower in transom for swim platform

Hinged radar arch

Flybridge/Upper Helm Station

21' bridge clearance with the arch raised and antennas lowered, 31' bridge clearance with antennas up.  Custom built with doing the "GREAT LOOP" in mind, she has a "fixed structure" height of only 14 feet.  This 14' air draft is achieved by lowering the hinged radar arch, a process accomplished by removing 2 pins and lowering the radar arch and soft top.

New canvas covers for windshield, pilothouse doors, helm chairs, electronic console, door, hatch and seating area. Bimini top (new 2015) Makrolan 3-side enclosure (like new) with stainless steel frame, hinged radar arch, center-line helm station with pedestal seats.  Stainless steel sink with hot and cold water.

Stereo speaker with volume controls

"J" shape settees port and starboard with oval fixed tables and storage under

Refrigerator with freezer

New upgraded Pilothouse electronics are repeated at the upper station.


(2) Upgraded Northern Lights 20kw generators in sound shields (1,871 Starboard and 1,871 Portside - matching hours is a sign of superb genset maintenance).

(2) Upgraded Cablemaster shore power reel retrieval systems aft (port & starboard)

Upgraded Yacht-O-Matic 120/240VAC shore power incoming voltage regulation system

Sentry 24VDC battery charger

Sentry 12VDC battery charger

50-amp shore power plug-in on bow

Engine & Mechanical

Upgraded Caterpillar twin 3406 E's, 800hp, Starboard 2,581 hours and Portside 2,570 hours (the 11 hr delta is from starting the starboard engine 1st and also using it to power thrusters or windlass)


The beautifully crafted sole in this area was custom built by the talented craftsmen of the Pacific NW at an optional upgraded cost of $30,000 using maple and holly wood strips.  A leather Stidd helmsman chair is mounted on a stainless steel pedestal directly aft of the centerline helm and destroyer wheel.

Equipment includes:

ICOM M-506 VHF radio

Datamarine AWS/AWD indicator gauge

Anchor windlass remote control

Spotlight control

Tank tender fuel and water monitor

Trim tab controls

Engine gauges

Bilge pump monitoring system

Air horns

Barometer & chronometer

Gemini magentic compass

Stereo speaker controls

Kobelt engine controls

Wesmar stabilizer controls

Hydraulic Bow and stern thruster controls

Remote Generator controls for port and starboard gensets

Feruno 72-mile radar (2016)

Elbex closed circuit camera/display monitoring system


Kobelt engine stowaway back down control station including thruster control

Fire Magic stainless steel LPG BBQ grill with large grilling hood for slow roasting

New Cockpit Fridge with Ice-tray

Stereo speakers with volume controls

Wide transom door leads from cockpit to swim/dive platform

Centered, pedestal mounted oval shape fiberglass table


Fresh water spigot

Dinghy pop-up cleats on swim platform

Sampson heavy duty posts with rollers for towing tender

Cable TV and telephone dockside hook-ups

Engine Room and Lazarette have hidden steel lock bars


Upgraded Caterpillar twin 3406 E's, 800hp, Starboard 2,581 hours and Portside 2,570 hours Cruisair reverse cycle 4-zone air conditioning with SMX II digital controls Hydraulic package (stabilizers, thrusters, davit & windlass) off PTO's on both main engines Wesmar Hydraulic Stablilizer System

(2) Spare props and Dripless shaft seal

Overboard discharge pump with timer

Spur Line Cutters

Hydraulic Bow and Stern thrusters

ZF Marine Gears 2:6:1

Dual Racor fuel filter/water separators - main engines

Fresh water spigot

Fireboy Halon fire extinguishing system

Upgrades/New Equipment

2016 Yacht Controller - 4 function

2016 Shakespeare 17' 6" VHF 9db 2Pc Galaxy Antenna

2016 Icom M506 VHF w/ Hailer, N2K Radio

2016 Furuno Navpilot 711C, Self Learning, Adaptive Autopilot, Color Display at upper and lower helm

2016 2nd Control Unit Navpilot 711C

2016 Furuno GP 1870F GPS/Chartplotter/Fishfinder 7" Color LCD

2016 Furuno GPA017 Passive GPS Antenna

2016 Cmap 4D Full, East Coast and Bahamas, SD/MSD

2016 KVH Tracvision TV5 w/ IP enabled TV-Hub A for N. America Service

2016 DIRECT TV Ethernet Coax Adapter for Auto Switching in Multi receiver Applications

2016 Furuno F170 Depth, Speed, Wind Package w/ 2 F170 Display at each helm station

2016 Furuno F170 4.1" Color LCD Instrument Display

2016 Smart Sensor Depth & Temp

2016 Furuno Navnet TZ Touch 14.1" Multi-function Display

2016 Bahamas Raster Chart Unlock Code

2016 Furuno DFF1 Network Black Box Sounder

2016 IRIS075 Low Profile IR Color Camera

2016 Aigean Link 7 Dual Band Wifi

2017 Stabilizer Upgraded with Wesmar DSP 5000 Gyro retrofit system

2017 Yamaha Stereo

2017 DVD Player

2017 Replaced AV cables with HDMI cables and old RCA audio output cables with Optical audio cables

2017 Change dripless shaft bearings, put 2 spares on

2017 Wesmar V2-10M 15hp Hydraulic Bow and Stern Thruster

2019 Reconditioned Props

2019 New Bottom Paint

2019 Shaft Seals, Cutlass Bearings and Rudder Seals

Broker Comments

The West Bay 58 has been a proven a very capable yacht with over 90 of the 58/64 models produced.  The excellent performance of this modified V-hull design combined with the yachts established reputation is a very safe "sea-boat" is largely responsible for the designs continued demand and short supply.  The spacious salon, wide walk-around side decks and an engine room easily accessible from the cockpit with standing headroom for most people, contributes in no small way to the West Bay Sonship 58's popularity.


The Company offers the details of this vessel in good faith but cannot guarantee or warrant the accuracy of this information nor warrant the condition of the vessel. A buyer should instruct his agents, or his surveyors, to investigate such details as the buyer desires validated. This vessel is offered subject to prior sale, price change, or withdrawal without notice.

Listing Marketed by

Marlow Marine Sales
Marlow Marine Sales
4204 13th Street Court West Palmetto, Florida, 34221 USA

I'm interested in Summer Thunder

Share With Your Friends


Call Broker

Marlow Marine Sales
Marlow Marine Sales