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1984 Shannon 28

Price Reduced
$29,000 USD
$32,000

Seller's Description

Somerledi, hull #52, was one of the last Shannon 28’s ever made. This incredibly tough boat will take care of you when conditions deteriorate. She’s the “offshore” layout: purpose-built to cross oceans short or even single-handed. In this layout, the quarterberth positions your head at the center of pitch for the boat, and so allows more comfortable sleeping while the boat is underway compared to the V-berth of the other layouts. The settees are comfortable, too, and are outfitted with lee cloths. Instead of the V-berth, the forward cabin has the head, a handy vice, and lots of storage space. Moving the head to the forward compartment opens up the cabin to make it feel very spacious. The head is configured to pump into a holding tank, which can be pumped out from the deck or out of a through-hull while offshore.

I’ve put her through all sorts of conditions sailing the entire east coast (see https://share.garmin.com/anlach) of the US. She had been sailed from the Gulf of Mexico to Nova Scotia even before I owned her, and she’s ready to keep going. The shape of the hull at the bow will split smoothly into a wave instead of slamming against it, which gives this boat an easy motion compared to some lighter boats. The rudder and propeller are protected by a deep skeg. This is a great relief when you’re sailing through fields of lobster buoys in Maine. Also, the encapsulated lead keel is strong - you don’t have to worry about rusty keel bolts giving way if you run aground because there aren’t any. The keel was layed up with the hull as part of the mold.

The original Yanmar 2GM is dependable and has been well-maintained. It’s easier to access than most other Shannons thanks to the well-installed, commercial grade Bomar hatch in the cockpit sole. I’ve replace the internal zincs twice, most recently in 2024. The main shaft seal was replaced in 2022, and the transmission seal to the prop shaft was just replaced in 2024. There are currently no oil leaks! Pretty good for a 40-year-old engine.

The boat is very easy to single-hand. The wind vane is as old as the boat and has full range of motion - no interference with the solar panels. This is the reason the solar array was designed as an “L” shape. There’s also an electronic auto-pilot for when the wind is too light and you’re motoring. The trim tab that the wind vane uses can be adjusted when the vane is disconnected to balance the helm when you’re heeled over. The two 100W solar panels are enough to recharge the battery every day and keep the fridge running around the clock. If you get a few cloudy days in a row, there are switches to easily swap the house and starter batteries to extend your time before you ever need to run the engine to recharge. For navigation, I’ve always used a couple Ipads with Navionics. They work very well with the Vesper AIS - just connect to the WiFi, make sure it’s enabled in the app, and you will see the other boats.

The first fifty one Shannon 28s must have given the builders plenty of practice because the interior woodwork is masterful. It feels super cozy to be surrounded by teak with the sun coming in through the bronze portlights, or with the little woodstove burning on colder evenings. The full galley has both a freshwater pump, which can draw from any of the three 20-gallon water tanks, and a separate pump hand-pump for getting water from a through-hull or pumping out the ice-box (controlled with a Y-valve). The Origo/Dometic alcohol burning stoves are safe and easy to use for cooking, and the refridgerator has a lot of space. People up to 6’2” in height can stand up fully in the cabin - much more room than other small boats.

On deck and in the cockpit, the diamond-pattern nonstick helps prevent slipping. The tiller steering is simple and works well with the transom-hung rudder. The 33lbs Rocna Vulcan anchor with all-chain rode lets you sleep easily. The main bow roller for the chain rode is mid-bowsprit. I have heard this can be an issue on other Shannons, but this one is reinforced by steel plates that are welded all the way around the sprit. This reinforcement is not standard on other S28s. I would still recommend to snub the chain using a nylon line run through a snatch block at the tip of the sprit. It works well, and I’ve left that snatch block on the boat. Twin forestays allow hoisting the high-clewed yankee jib even while the roller furling sail is bent on. The self-tacking staysail is truly wonderful if you have to fight against some chop upwind. New 3/8 thick stainless steel chainplates were fabricated and installed in 2019. When hauled out, the custom sunbrella cover keeps snow off and UV damage to a minimum, and is installed while the mast is in.

I have been living in Seattle for a couple years now, and after a final adventure in the Bahamas that just concluded this February, the time has come to sell the boat. It’s been a great six years, and I’d highly recommend this boat. It includes a lot of the expensive items you need for a safe, ocean-going vessel (VHF, EPIRB, AIS, etc. - see below for full list), and it shouldn’t last too long at this price!

Instagram: https://www.instagram.com/anlach

Accommodations

For solo sailing it’s perfect. Two is also good for longer trips. Three is okay for a few days, but it’s a little cramped. Technically, you can sleep two in the quarterberth, and with the two settees, that’s four as the max for overnights. I’ve had five on it for a daysail, but the cockpit gets pretty full. Mechanical Equipment

Ground tackle
    33 lbs Rocna Vulcan as main anchor on bow roller. There is about 140 ft of 5/16 galvanized chain rode in the bow and an additional 15ft in the stern.
    45 lbs Mantus stored below as a storm anchor
    Fortress Anchor mounted on stern rail
Wind vane self-steering uses the trim tab on the rudder and works well. The trim tab can also be adjusted to balance the helm when not using the vane.
Twin forestays allows use of the hanked on Yankee jib or the roller furling jib.
Sails
    Roller-furling jib - the newest working sail. Sun-protection is installed along foot and leech so the sail is well-covered when furled. Needs to be mostly furled in when tacking because of the staysail stay.
    Mainsail - two reefs and partial battens. Currently useable, but needs re-stitching because the threads are weakened by UV.
    Staysail - gets less use than the main, so still in pretty good shape.
    Yankee jib - still in pretty good shape, because the roller furling jib is easier to use
    Storm Trysail - New orange storm trysail. Raised it up once, but never used it.
    Drifter - 80s colors… Only tried it a couple times
    Incomplete Staysail - I was going to make a new staysail and mainsail as a project, but never quite finished the first one… still working though.

Galley Equipment

Adler Barbour Refrigeration 
Dual Origo alcohol-burning stoves for cooking

Deck and Hull Equipment

Solar Array - Two 100 W Renogy Rigid panels and an MPPT charge controller with a switch installed for the panels. A separate 50W panel can be used for float charging
Sunbrella Cover for mast-in storage
Sun covers for staysail, main, and tiller
Dodger - zips up in the center, so it's also useable when the dinghy is on board
Bronze Bell engraved “SOMERLEDI"

Navigation Systems

Vesper Marine AIS XB-8000 transponder with WiFi
Standard Horizon VHF in both cabin and cockpit  - the antenna is at the top of the mast
Furuno Radar
Electronic autopilot computer is a pypilot. It works well on rivers or flat, calm waters. (See mechanical equipment for wind vane)

Additional Equipment

Cubic Mini Cub wood stove. Above the Dickenson Marine deck fitting, an additional two feet of flue pipe with an exhaust cap is swapped for the rain cap when using the woodstove.
Fiorentino Para-Anchor and 300 feet of nylon rode for heaving-to at sea. See Lin & Larry Pardey's Storm Tactics.
2020 ACR EPIRB
Three fire extinguishers
New Orion flare gun with 4 flares
25 ft water hose
30amp shore power with 50 ft cable and splitter for 50amp hookups
Xantrex Prowatt SW 1000 Watt power inverter
Two group 27 marine batteries: one Everstart deep cycle and one West Marine Dual Purpose. There are two switches to choose which is the house battery and which is for starting.
Uninstalled Davis Vantage Pro Anemometer
Pomo hand-pump portable shower
Weems & Plath Barometer
Kidde Carbon Monoxide detector

Optional add-ons

Nesting, Rowing, & Sailing Dinghy - $1200. CLC Eastport Nesting pram
Katadyn Manual Water maker with repair seal kit and biocide tablets - $400

Specs

Designer
Walter Shultz
Builder
Shannon Yachts
Associations
?
# Built
55
Hull
Monohull
Keel
Fin
Rudder
Transom hung
Construction
FG
Also Known As
Shannon 28 Cutter

Dimensions

Length Overall
32 1 / 9.8 m
Length On Deck
28 2 / 8.6 m
Waterline Length
22 11 / 7 m
Beam
9 6 / 2.9 m
Draft
4 3 / 1.3 m
Displacement
9,300 lb / 4,218 kg
Ballast
3,600 lb / 1,633 kg (Lead)

Rig and Sails

Type
Cutter
Reported Sail Area
445′² / 41.3 m²
Total Sail Area
445′² / 41.3 m²
Mainsail
Sail Area
160′² / 14.9 m²
P
32 1 / 9.8 m
E
10 2 / 3.1 m
Air Draft
?
Foresail
Sail Area
285′² / 26.5 m²
I
38 0 / 11.6 m
J
15 1 / 4.6 m
Forestay Length
41 0 / 12.5 m

Auxilary Power

Make
Yanmar
Model
2GMF
HP
15
Fuel Type
Diesel
Fuel Capacity
20 gal / 76 l
Engine Hours
1300

Accomodations

Water Capacity
60 gal / 227 l
Holding Tank Capacity
?
Headroom
6 2 / 1.9 m
Cabins
?

Calculations

Hull Speed
6.4 kn
Classic: 6.42 kn

Hull Speed

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.

Formula

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL

6.43 knots
Classic formula: 6.42 knots
Sail Area/Displacement
16.1
16-20: good performance

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.

Formula

SA/D = SA ÷ (D ÷ 64)2/3

  • SA: Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
  • D: Displacement in pounds.
16.1
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
38.7
<40: less stiff, less powerful

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.

Formula

Ballast / Displacement * 100

38.72
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
344.2
300-400: heavy

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.

Formula

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

  • D: Displacement of the boat in pounds.
  • LWL: Waterline length in feet
344.2
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
27.7
20-30: coastal cruiser

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.

Formula

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)

  • D: Displacement of the boat in pounds
  • LWL: Waterline length in feet
  • LOA: Length overall in feet
  • Beam: Width of boat at the widest point in feet
27.69
<20: lightweight racing boat
20-30: coastal cruiser
30-40: moderate bluewater cruising boat
40-50: heavy bluewater boat
>50: extremely heavy bluewater boat
Capsize Screening
1.8
<2.0: better suited for ocean passages

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.

Formula

CSV = Beam ÷ ³√(D / 64)

  • Beam: Width of boat at the widest point in feet
  • D: Displacement of the boat in pounds
1.81
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

From BlueWaterBoats.org:

Launched in 1978, the Shannon 28 is regarded as one of the highest quality production 28 footers to come from America. The boat was conceived to serve well for family cruising right through to serious offshore sailing with liveaboard capability for two. Notable accomplishments include the two single-handed passages across the Atlantic by Rudder Magazine’s editor, Monk Farnham, at age 72 and again at age 76 which earn him a spot in the Guinness Book of World Records.

The design came from Walter Schulz, a boatbuilder described as one of the last of a wonderful breed, the complete boatbuilder – one who designs boats, invents rigs, iterates on hull shapes not only computer but also crafts the half models for testing and finally builds the real boat with his own hands. He founded Shannon Yachts in Rhode Island in 1975 with the launch of the sweet sailing Shannon 38 offshore cruiser. The Shannon 28 followed just 3 years later as the second yacht to join the stable.

Schulz’ design goals for the Shannon 28 was typical of a good cruiser – seaworthiness, comfort, and stable handling across all wind and seas condition, but he also wanted the boat to be exciting to sail. Her heavy displacement and full keel configuration fulfils the former, but interestingly, by positioning the rudder further aft and cutting away the aft portion of the keel, the Shannon 28 is also quite responsive. Rig selection also reinforces the design theme with the choice of a true cutter configuration, a favourite for offshore passage-making for its ability to maintain balance over a wide range of wind conditions. At 470 square feet of canvas, her sail area to displacement ratio is high enough to give her respectable light air performance and overall performance is good.

“I’d like to have every boat I build outlive me” – Walter Schulz

No article about Shannon boats should go without a mention of build quality – it’s exemplary. Right from the early days, Shannons have certainly earned their reputation for quality, not only in build quality but also in their seaworthy designs, even winning a nod of approval of Ferenc Mate by the inclusion of Shannon Yachts in his book The World’s Best Sailboats Vol. 2.

The Shannon 28 was available in three interior layouts, including an offshore configuration that had an aft quarter berth. There were thoughtful details to ease maintenance like breaking her tankage down into three smaller water tanks plus a fuel tank, any of which can be removed without cutting away any part of the boat or joiner work. Choice of a outboard rudder and keel sections which allow her to stand on her bottom also simplify maintenance.

The hull was built as a one piece fiberglass molding – hand laid mat and woven roving with additional reinforcements in potential stress areas such as the bow, keel and transom intended to provide the hull with added strength in the case of grounding situations.

The decks were constructed in fiberglass and cored in balsa with well thought out deck hardware attachment points. Delamination and deck leaks are rare. The hull-to-deck joint was an internal flange bonded with adhesive bedding compound and bolted on 8-inch centers. Structural bulkheads were attached with fiberglass straps through the bulkhead and then further secured with continuous fiberglass tabbing along the entire joint. These belt and suspenders methods were typical of the entire construction.

In total around fifty-five boats were produced between 1978 – 1986, after which they continued to be available from Shannon on a semi-custom basis right up to 1999, by which time the price had risen from $55k to $175k. The Shannon 28 remains one of the classic models of the Shannon line, and continues to be sought after in the used boat market with their prices holding up very well.

Links, References and Further Reading

» The official Shannon Yachts website
» The World’s Best Sailboats Vol. 2 by Ferenc Mate

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