swift 40 sailboat

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• Thread starter Mike H.
• Start date Jan 5, 2016
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We're in the market for a new boat. What can you tell me about the Sparkman & Stephens, 40' Center cockpit, Ketch rigged yacht.  

JohnShannon

Sailboatdata.com is your friend http://sailboatdata.com/viewrecord.asp?class_id=5692 Also Carls sailing calculator http://www.tomdove.com/sailcalc/sailcalc.html lets you compare boats So it is heavy for its length, not a lot of sail area. Looks like a kind of classic heavy cruising boat  

I hate to see this post drop off the page without others getting a chance to see it... If you haven't you should google Sparkman & Stephens. This is an old an venerable design firm. On Sailboatdata.com you will likely find at the bottom of the page for the Swift 40 a link to other designs by this firm. See here: http://sailboatdata.com/view_designer.asp?designer_id=12 . I feel safe in saying a boat designed by this firm has a good pedigree. Builders who have used these designs are Swan and Tartan. Different builders will have different quality standards depending on their market focus. The Swift appears tubby to me. But that may be what you want. It will not have the room that a modern 40' boat will and it will be more slow. But if well found, I'd guess it could take you where ever you want to go. You might be able to find more info on the North Star 80/20, which according to SBD is the same design.  

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Welcome to the home of the Swift 18

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This site offers a home for all owners and sailors of the Swift 18 to swap advice and ideas, as well as post pictures and files relating to the lovable swift.

We have many plans for the future, all depending on how this group grows, but the main objective is for everyone to get the best out of their Swifts and enjoy sharing experiences good bad and scary!

The Swift 18 first appeared at the 1981 Southampton Boat show and was designed as a fast yet comfortable trailer sailor conforming with the French Micro Cupper rules. The boat is virtually unsinkable with enough built in buoyancy to float if swamped, even with 3 crew aboard.

The first Swift (either a prototype or number 1) was an aluminium boat made from sheet aluminium - hence the chine hull. The original intention was that all boats should be aluminium but this proved impractical and this boat was then used to make the moulds.

The original manufacturer was 'John Charnley Associates' (JCA) who built boats from 1982 to 1985. These were the 1 to 218 series and at the end of this period they were built at Shamrock Quay in Southampton by a company trading under the name of "Swiftcraft" (still John's company).  These boats all had tapered masts.

In October 1985, John and his wife Caroline sold the business to a businessman who wanted to give the business to his son in order to entice him back from Australia. This did not work and eventually the business was bought by Honnor Marine at Totnes Devon. They built the 300 series of boats - different toerails, non-tapered mast etc - a bit of a cost reduced version. Honnor Marine started, on taking the production and ownership over from Swiftcraft, with natural aluminium toerails, then evidently bought a job-lot of black toerail, finally then produced a new top mould with a moulded-in toerai.  Honnor Marine built about 35 to 40 boats. Roger Marsh who originally bought a Swift, was taken with the boat and for some time was a member of the association. He had an interest in Marine matters and owned "Marlin International". Eventually (around 1988 or so) Roger bought the rights, moulds and materials from Honnor Marine and began to market the 400 series of boats back in Southampton. He reversed some of the cost reductions which Honnor Marine had made but continued with the moulded-in toerail.  The 400-Series boats reverted to the original as-designed weight of hull layup rather than Honnor Marine's heavier hulls and went back to a tapered mast.  Only a small number of the 400 series boats were built. All were white with two-tone blue trim divided by a white band, 'Swift 18' or 'Swift 20' marked prominently and a smaller white '400-series' superimposed on the trim aft.  At some point Roger discussed destroying the moulds, as he could no longer store them anywhere.

The moulds then reappeared in Norfolk in 2005 and were bought by Mike Cooper who then built his own 500 series boat.

The boat has 2 full-length single berths aft with a large double forward, a sink, 2 burner cooker and room for a loo. With 4' 4" head room in the cabin the accommodation is surprisingly comfortable. It also comes complete with a lifting keel which leaves only 3 inches exposed when raised making the boat easy to launch and retrieve from the trailer. With a little ingenuity the mast can be raised and lowered single handed.

Reports at the time of the Swifts introduction considered her to have excellent and vice free sailing qualities, in a nasty Force 6/7 and with 2 reefs in the main she stayed light on the helm, was well balanced and galloped along like a racehorse (BPO April 82).

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• Sailboat Guide

Swiftsure 40 (Seaborn)

Swiftsure 40 (Seaborn) is a 39 ′ 11 ″ / 12.2 m monohull sailboat designed by Ben Seaborn and built by Blanchard Boat Co. starting in 1947.

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)

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