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- Sailboat Guide
Southerly 115
Southerly 115 is a 36 ′ 10 ″ / 11.2 m monohull sailboat designed by Rob Humphreys and Dick Carter and built by Northshore Yachts starting in 1983.
Rig and Sails
Auxilary power, accomodations, calculations.
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.
Classic hull speed formula:
Hull Speed = 1.34 x √LWL
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL
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.
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.
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.
Ballast / Displacement * 100
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.
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
- D: Displacement of the boat in pounds.
- LWL: Waterline length in feet
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.
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )
- D: Displacement of the boat in pounds
- LOA: Length overall in feet
- Beam: Width of boat at the widest point in feet
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.
CSV = Beam ÷ ³√(D / 64)
Displayed here is the MIII version which has a deeper swing keel and twin rudders designed by Humphreys. Specs above apply to Mk 2 thru 4.
The first version of 115 was a Carter design. Displacement:14,600 Ballast 6978 Board up 2’3” Board Down 6’8”
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- Southerly 115
The Southerly 115 Sailboat
The Southerly 115 is a versatile and seaworthy cruising sailboat that features a unique swing keel system that allows it to sail in shallow waters and dry out on the beach. Designed by Dick Carter and Rob Humphreys, the Southerly 115 was produced by Northshore Yachts of Chichester, England, from 1983 to 2011.
The boat has a spacious centre cockpit, a comfortable interior layout, and a range of rig and sail options to suit different sailing preferences. It is a popular choice for sailors who want to explore remote and varied cruising grounds without compromising on performance or comfort.
Shown above and described below is the single-rudder MkII version, unlike versions III and IV with twin rudders which enabled the boat to dry-out upright.
Published Specification for the Southerly 115
Underwater Profile: Swing keel
Hull Material: GRP (Fiberglass)
Length Overall: 36'10" (11.2m)
Waterline Length: 27'6" (8.40)
Beam: 11'11" (3.6m)
Draft: 2'3" (0.7m) with keel up; 8'1" (2.46 m) with keel down
Rig Type: Masthead sloop
Displacement: 15,215lb (6,902kg)
Designer: Dick Carter
Builder: Northshore Yachts (UK)
Year First Built: 1983
Owners Association: Southerly Owners Association
Published Design Ratios for the Southerly 115
1. Sail Area/Displacement Ratio: 10.0
2. Ballast/Displacement Ratio: 49.9
3. Displacement/Length Ratio: 327
4. Comfort Ratio: 28.6
5. Capsize Screening Formula: 1.9
A Few FAQs about the Southerly 115 ...
Based on the published design ratios for the Southerly 115, how is the boat likely to perform under sail?
Based on these ratios, the Southerly 115 can be classified as a heavy displacement cruising boat with moderate sail area and high stability. The boat is likely to perform well in strong winds and rough seas, but may be slower and less responsive in light airs. The boat has a good balance of speed and comfort, and can handle a variety of sailing conditions.
Is the Southerly 115 still in production and, if not, when did production end and how many of these sailboats were built?
The Southerly 115 is no longer in production. The last model was built in 2011, when Northshore Yachts ceased trading due to financial difficulties. According to the Southerly Owners Association, a total of 224 Southerly 115 boats were built over four generations: Mk I (1983-1988), Mk II (1988-1994), Mk III (1994-2005), and Mk IV (2005-2011).
What, if any, alternative versions of the Southerly 115 were built and what are the differences between them?
The Southerly 115 underwent several changes and improvements over its production history, resulting in four distinct versions:
- The Mk I version had a triangular airfoil-shaped drop keel and a single shallow rudder. It had a fractional rig with a self-tacking jib and an optional cutter rig. It had a two-cabin layout with a double berth aft and a V-berth forward.
- The Mk II version had a more streamlined drop keel with a bulb at the bottom and a twin rudder system. It had a masthead rig with a genoa and an optional cutter rig. It had a three-cabin layout with two double berths aft and a V-berth forward.
- The Mk III version had a redesigned hull shape with more freeboard and volume. It had a deeper drop keel with more ballast and a twin rudder system. It had a masthead rig with a genoa and an optional cutter rig or ketch rig. It had a three-cabin layout with two double berths aft and an offset double berth forward.
- The Mk IV version had an improved drop keel mechanism with hydraulic control and an indicator gauge. It had a twin rudder system with optional skegs for better directional stability. It had a masthead rig with a genoa and an optional cutter rig or ketch rig. It had a three-cabin layout with two double berths aft and an offset double berth forward.
How many people can sleep on board a Southerly 115?
The Southerly 115 can sleep up to eight people on board, depending on the model and configuration. The boat has three cabins that can accommodate six people in double berths, plus two more people in the saloon that can be converted into single berths.
How did the sailing press review the Southerly 115?
The Southerly 115 received mostly positive reviews from the sailing press, praising its versatility, performance, and comfort. Here are some excerpts from some of the reviews:
- "The Southerly 115 is a boat that can take you anywhere. It has the ability to sail in deep water with a good turn of speed and point high to the wind, yet at the touch of a button, the keel can be raised to give a draft of just over two feet, allowing you to explore shallow creeks or dry out on a beach." (Sailing Today, 2006)
- "The Southerly 115 is a well-built, well-designed boat that offers a unique combination of shoal draft and good sailing qualities. It is not a boat for everyone, but for those who value the freedom and flexibility that it offers, it is hard to beat." (Sail Magazine, 2008)
- "The Southerly 115 is a boat that can do it all. It can cross oceans, cruise coastlines, and venture into the shallowest of waters. It is a boat that can adapt to your sailing style and preferences, whether you want a simple sloop or a fully rigged ketch. It is a boat that can provide comfort and convenience for long-term living aboard or short-term holidays." (Yachting Monthly, 2010)
What do owners of the Southerly 115 have to say about their boats?
Owners of the Southerly 115 are generally very happy with their boats, and often share their experiences and adventures on blogs, forums, and social media. Here are some quotes from some of the owners:
- "We have owned our Southerly 115 for over 10 years and have sailed her extensively in the UK, Europe, and the Caribbean. She has been a fantastic boat for us, reliable, comfortable, and fun to sail. We love her swing keel system, which allows us to access places that other boats can't. She has been our home away from home and we have made many wonderful memories on board." (Chris and Laura Mlynarczyk, owners of Blue Sky)
- "Our Southerly 115 is our dream boat. We bought her in 2012 and have since sailed her around the world. She has performed brilliantly in all kinds of conditions, from light winds to storms, from calm seas to big waves. She has been spacious enough for our family of four and our guests, and cozy enough for just the two of us. She has given us the freedom and flexibility to explore new horizons and discover new cultures." (Mark and Sue Sanders, owners of Distant Shores)
- "We have owned our Southerly 115 since 2009 and have sailed her mainly in the Mediterranean. She has been a great boat for us, easy to handle, fast, and comfortable. We love her center cockpit design, which gives us a lot of privacy and protection. We also love her variable draft, which allows us to anchor close to shore or dry out on the sand. She has been our perfect cruising companion." (Peter and Anne Jones, owners of Sea Mist)
What is the history of the builders of the Southerly 115 and is the company still in business?
The builders of the Southerly 115 were Northshore Yachts Ltd., a British company founded in 1971 by John Baker and Tom Richardson. The company started by building small sailing dinghies and later expanded to larger cruising yachts under the Southerly brand. The company was known for its innovative designs and high-quality craftsmanship, and became one of the leading manufacturers of swing keel sailboats in the world.
Unfortunately, Northshore Yachts went into administration in 2013 due to financial difficulties caused by the global recession and declining sales. The company was acquired by another British company called Discovery Yachts Group Ltd., which continued to produce some of the Southerly models under a new name: Discovery Swing Keel Yachts Ltd.
However, in 2019, Discovery Yachts Group also went into administration after facing legal disputes with some of its customers and suppliers. The company was taken over by another British company called Binti Marine Holdings Ltd., which currently owns the rights to the Southerly brand and plans to resume production of some of the models in the future.
Is the mast on the Southerly 115 deck-stepped or keel-stepped?
The mast on the Southerly 115 is deck-stepped on a stainless steel compression post that rests on a reinforced bulkhead below. This arrangement allows for easier maintenance and inspection of the mast base and wiring.
What keel options, if any, are available for the Southerly 115?
The Southerly 115 has a unique swing keel system that allows the boat to adjust its draft from 0.69 m (2 ft 3 in) to 2.46 m (8 ft 1 in) by using a hydraulic ram. The keel is made of cast iron and has a lead bulb at the bottom for extra stability. The keel can be raised or lowered by using a control panel in the cockpit or at the chart table. The boat also has an indicator gauge that shows the position of the keel at any time.
What is the average asking price of a secondhand Southerly 115?
The average asking price of a secondhand Southerly 115 depends on the model, condition, and equipment of the boat, as well as the location and market demand. According to YachtWorld, a global online marketplace for boats, the current range of prices for a used Southerly 115 is from £59,950 to £199,950, with an average of £114,950.
How does the Southerly 115 compare to other similar sailboats in its class?
The Southerly 115 is a unique sailboat in its class, as it offers the versatility of a swing keel system that enables it to sail in deep or shallow waters. There are not many other sailboats that have this feature, but some possible competitors are:
- The Feeling 1090, a French-built sailboat that has a lifting keel and twin rudders. It has a similar length and beam to the Southerly 115, but a lighter displacement and less sail area. It has a two-cabin layout with a double berth aft and a V-berth forward.
- The Ovni 365, an aluminum-hulled sailboat that has a lifting keel and twin rudders. It has a slightly longer length and beam than the Southerly 115, but a heavier displacement and more sail area. It has a three-cabin layout with two double berths aft and an offset double berth forward.
- The Sirius 35 DS, a German-built sailboat that has a lifting keel and twin rudders. It has a shorter length and beam than the Southerly 115, but a similar displacement and sail area. It has a two-cabin layout with a double berth aft and an offset double berth forward.
What other sailboats have been created by the designer of the Southerly 115?
The Southerly 115 was designed by two renowned naval architects: Dick Carter and Rob Humphreys.
Dick Carter was an American designer who was famous for his successful racing yachts in the 1960s and 1970s, such as Red Rooster, Rabbit, and Imp. He also designed several other cruising yachts for Northshore Yachts, such as the Southerly 100, 105, and 110.
Rob Humphreys is a British designer who is known for his innovative and versatile designs for various clients, such as Oyster Yachts, Elan Yachts, and Moody Yachts. He also designed several other models for Northshore Yachts, such as the Southerly 135, 38, and 47.
The above answers were drafted by sailboat-cruising.com using GPT-4 (OpenAI’s large-scale language-generation model) as a research assistant to develop source material; to the best of our knowledge, we believe them to be accurate.
Other sailboats in the Southerly range include:
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Review of Southerly 115
Basic specs..
The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season.
The boat is equipped with 8 berths.
The Southerly 115 is equipped with a swing keel. A swing keel is a pivoting lifting keel, allowing to sail both coastal and inland waters.
The boat can enter even shallow marinas as the draft is just about 0.69 - 0.79 meter (2.26 - 2.56 ft) dependent on the load. See immersion rate below.
Southerly 115 is typically equipped with an inboard Yanmar diesel engine
Sailing characteristics
This section covers widely used rules of thumb to describe the sailing characteristics. Please note that even though the calculations are correct, the interpretation of the results might not be valid for extreme boats.
What is Capsize Screening Formula (CSF)?
The capsize screening value for Southerly 115 is 1.95, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.
The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Southerly 115 is about 272 kg/cm, alternatively 1527 lbs/inch. Meaning: if you load 272 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1527 lbs cargo on the boat it will sink 1 inch.
Sailing statistics
This section is statistical comparison with similar boats of the same category. The basis of the following statistical computations is our unique database with more than 26,000 different boat types and 350,000 data points.
What is L/B (Length Beam Ratio)?
What is a Ballast Ratio?
SA/D (Sail Area Displacement ratio) Indicates how fast the boat is in light wind: - Cruising Boats have ratios 10-15 - Cruiser-Racers have ratios 16-20 - Racers have ratios above 20 - High-Performance Racers have ratios above 24 Sail-area/displacement ratio (SA/D ratio): 15.89
Maintenance
If you need to renew parts of your running rig and is not quite sure of the dimensions, you may find the estimates computed below useful.
Usage | Length | Diameter | ||
Jib sheet | 11.2 m | (36.9 feet) | 14 mm | (0.55 inch) |
Genoa sheet | 11.2 m | (36.9 feet) | 14 mm | (0.55 inch) |
Mainsheet | 28.1 m | (92.3 feet) | 14 mm | (0.55 inch) |
Spinnaker sheet | 24.8 m | (81.2 feet) | 14 mm | (0.55 inch) |
This section is reserved boat owner's modifications, improvements, etc. Here you might find (or contribute with) inspiration for your boat.
Do you have changes/improvements you would like to share? Upload a photo and describe what you have done.
We are always looking for new photos. If you can contribute with photos for Southerly 115 it would be a great help.
If you have any comments to the review, improvement suggestions, or the like, feel free to contact us . Criticism helps us to improve.
IMAGES
COMMENTS
Builders: Northshore Yachts (UK) Related Sailboats: SOUTHERLY 105. Download Boat Record: Notes. Displayed here is the MIII version which has a deeper swing keel and twin rudders designed by Humphreys. Specs above apply to Mk 2 thru 4. The first version of 115, known as the Southerly 105, was a Carter design.
D. Carter and Rob Humphreys and Northshore Design Team. Blue Water Value Rank (BWVR) 1877
The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network.
The lowest bridge on the Canal du Midi is reputedly one in Carcassonne. (see insert). Water levels can change the clearances dramatically, sometimes closing canals due to either drought or too much rain. The Southerly 115 with its lifting keel looks like a good candidate for the canals in any case.
Construction. The Southerly 115 has a solid hand- laid-up fiberglass hull below the water- line. The topsides and the deck are cored with balsa except in load areas, where plywood core was substituted. The hull and deck are joined at the top of a bulwark with a through-bolted flange that was also chemically bonded.
Southerly 115 sailboat layout image courtesy of sailboatdata.com. Southerly 115. The Southerly model 115 was built by Northshore Shipyard which built all Southerlys between 1978 and 2014. Production of the 115 began in 1983 with Series I, II and III versions introduced over the years. Early models were designed by Dick Carter; later versions ...
The Southerly 115 is a 36.83ft masthead sloop designed by D. Carter / Rob Humphreys / Northshore Design Team and built in fiberglass by Northshore Yachts (UK) between 1983 and 2003. It accomodates 5 people in 2 cabins plus salon. The Southerly 115 is a heavy sailboat which is under powered. It is very stable / stiff and has a good righting ...
Southerly 115 is a 36′ 10″ / 11.2 m monohull sailboat designed by Rob Humphreys and Dick Carter and built by Northshore Yachts starting in 1983. ... The first version of 115 was a Carter design. ... Ballast 6978 Board up 2'3" Board Down 6'8" Suggest Improvements Source: sailboatdata.com / CC BY. Embed Embed. View Demo. Embed this ...
The Southerly 115 Sailboat. The Southerly 115 is a versatile and seaworthy cruising sailboat that features a unique swing keel system that allows it to sail in shallow waters and dry out on the beach. Designed by Dick Carter and Rob Humphreys, the Southerly 115 was produced by Northshore Yachts of Chichester, England, from 1983 to 2011.
The capsize screening value for Southerly 115 is 1.95, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races. Immersion rate. The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Southerly 115 is about 272 kg/cm, alternatively ...
On the Southerly 115 the fixed ballast is of 4,962 lbs, and the swing keel 2,016 lbs. With keel down the draught is 6' 8" on the early triangular-keeled boats,a nd just over 8 ft on the later boats with keels as shown at right. Despite this rather unconventional ballast arrangement, Southerly 115s are now rated as RCD Category A, and have a ...
The first swing keel Southerly. Originally introduced as the Southerly 33, her name was changed soon after introduction. Redeveloped into the Southerly 115 in 1984. Developed from the Southerly 135 Mk1 with an extended stern and bow sprit allowing her to be rigged as a ketch. LOD: 9.8m / 32.15 ft.
The version of the 115 reviewed is a later Mk IV model modified by Rob Humphreys to incorporate twin shoal- draft fixed rudders, while the Tanzer's rudder retracts up the transom on a small fixed skeg, and the Clearwater's rudder pivots aft to reduce draft. The goal, of course, is to still have enough rudder in the water to steer the boat ...
The series 2 benefits from a redeveloped keel shape and redesigned rudder blade offering better handling and manoeuvrability, with direct glazed windows replacing the original aluminium frames from the earlier version of the Southerly 115. Contact Information. Other Details. LOA 36'10" 11.25M. LWL 27'6" 8.38M. BEAM 11'11" 3.62M.
The Southerly 115 is a 36.83ft masthead sloop designed by D. Carter / Rob Humphreys / Northshore Design Team and built in fiberglass by Northshore Yachts (UK) between 1983 and 2003. ... The data on this page has been derived from different sources but a significant part is attributed to sailboatdata.com. We thank them for their encouragements ...
1983 - Southerly 115. Popular and versatile 'go anywhere' lift keel quality cruiser with sound sea keeping. Designed by Dick Carter and built by Northshore Yachts. 'Perfect Pitch' is a stylish spacious, comfortable boat. Seven berths in three cabins, including a full width aft double owner's cabin. Spacious fitted galley and two separate heads compartments.
Southerly 115 (unlike some modern Southerlies) is not a deck saloon as such - the galley up layout works very well and saloon is lower down but is both large and comfortable. Other used boats with inside helms: Sadler Panorama (Starlight 39 hull) - very rare Dehler 41DS Vancouver 34 or 38 Sovereign 40 Various Colvic Victors Voyager 35 or 40 ...
Find 28 Southerly 115 boats for sale near you, including boat prices, photos, and more. Locate Southerly boat dealers and find your boat at Boat Trader!
Joachim von Ribbentrop welcoming Vyacheslav Molotov in Berlin, November 1940. German-Soviet Axis talks occurred in October and November 1940, nominally concerning the Soviet Union's potential adherent as a fourth Axis power during World War II among other potential agreements. The negotiations, which occurred during the era of the Molotov-Ribbentrop Pact, included a two-day conference in ...
Answer 11 of 19: Hi there, I am planning to take Sapsan departing Moscow at 7.00AM on Monday to St. Petersburg. My hotel in on Lubyanka station and the first train will leave Lubyanka for Komsolskaya at 6.30AM. Accordingt to HopStop, it takes 9 minutes to travel...
Northshore Yachts (UK) www.northshore.co.uk. Began as Fairways Marine, builder the Fischer line of Motorsailors. Also builder of Vancouver, MG, and, its best known brand, Southerly. Southerly's are all swing keelers, specifically designed to navigate in shallow water and stand upright when 'beached'. Southerly was purchased by Discovery Yachts ...
115 S. Washington, Suite 2 PO Box 9780 Moscow, Idaho 83843 Phone: 208/882-6280 Fax:208/882-8707 [email protected]