seafarer 31 sailboat data

Seafarer 31 mki

The seafarer 31 mki is a 31.16ft masthead sloop designed by william tripp jr. and built in fiberglass by seafarer yachts between 1968 and 1974..

The Seafarer 31 mki is a heavy sailboat which is slightly under powered. It is stable / stiff and has an excellent righting capability if capsized. It is best suited as a coastal cruiser.

Seafarer 31 mki for sale elsewhere on the web:

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Review of Seafarer 31

Basic specs., 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 Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 6.3 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.

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 Displacement Length 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): 22.61

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.

This section shown boat owner's changes, improvements, etc. Here you might find inspiration for your boat.

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Seafarer 31 information

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Hi all, I'm new here. I've been looking at 30ft cruising boats for a few months now. I saw two alberg 30's, a rawson 30 and recently came across a seafarer for sale. I've found gobs of information about the alberg and rawson, but can't find much on the Bill Tripp designed seafarer 31. I like her lines but that doesn't really tell me too too much about her on the water. I have a few questions on her, especially her apparently light weight (8000# displacement in comparison to the 9000# alberg and 12000# rawson) and anyone's hands on experience with her (seakindliness, heel angle, how tender?) Thanks in advance. --->dave  

All the info I'm seeing shows the Seafarer 31 at over 10,000lbs, and if based on that info, it would have a low capsize ratio and a comfortable seakindly nature. Pretty tender initially. http://www.sndi.net/seafarer31/fohn.htm Check out this resto site.  

I saw that site too, they did a really nice job on her. The thing is that my seafarer is a sloop not a yawl and the survey weight put her at a bit over 8000#. It was a factory hull with a custom deck/interior so its possible that the sloop and weight issue is a custom thing as well. I figured as much about the CR and comfort factor, but they are just numbers. Anyone have any other information?  

Initially Seafarers were kit boats of dubious construction. However, a Brit named Brian Ackworth started building them in a factory in Huntington, NY, and quality and consistency improved. Most of the one's I've seen were designed by McCurdy and Rhodes, sailed very well, and had a modified fin keel and a skeg rudder. Like most boats of that era, blisters were an issue. We sailed the hell out of a 22 for a number of years, and really loved it.  

Hello, I am the owner of a 1967 Seafer 31 sloop. If You need more info contact me at [email protected] Richard  

Seafarer 31 yawl I've owned a 1973 Tripp designed Seafarer 31 mk 1 yawl for about five years. When I first got the boat, I'd say she needed quite a bit of TLC. I'm getting there. She sails wonderfully though and is quite a head turner with the black hull and the attached bow sprit, I think that was a mod from the original design. I recently took third place in a regatta with10 other boats, beating several more modern and supposedly faster yachts handily. The yawl rig really gets up and goes on a reach. She has a tendancy to roll in a following swell due to the narrow hull, but will point nearly as high as a sloop with a deeper keel. Average top speed seems to be 6.5 but I've seen over 10 when surfing down a wave. A fun boat to sail.  

I'm surprised no one pointed out this was an old thread...but I'm glad you responded. I purchased a 1971 31' Seafarer Yawl, Tripp design this past winter. It was in decent shape, pretty much ready to sail once I got the engine running. Anyway, I am interested in keeping contact with other Seafarer owners. Our boat is located off the Patapsco River off the Chesapeake. I am new to sailing, but it's always been a dream. Dan  

Hallow! I bought my Seafarer 31-1 last fall in Massachusetts (1972 built) and this spring-summer we have crossed Atlantic on her and sail long entire Mediterranean up to Marmaris, Turkey. In spite of absence of classic framing (the hull is just enforced by outer shell and inner glued together) she shown herself quite fine. Max wind we got was 30 kt in gusts but i was quite care about sail area being carried and was reefing the sails in advance once she heeled more than 10 deg. average speed from Boston to Azores was 4.1kt than, in variable winds of eastern part of Azores maximum dropped down to 3.5 kt. But i would say her average is like 3.8 kt in general. Upon finish the trip i found couple of cracks in inner shell but not critic. Would say, exclude extreme lack of space inside, this is quite reliable boat and i like her. Andrey  

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• Sailboat Guide

1971 Seafarer 31 Bill Tripp

• Description

Seller's Description

The owner bought this boat in 2005

General condition and any additional information

This very seaworthy boat is much appreciated for its classic design. She is a simple, pleasant sail also for solo and will take care of you in any weather. A good wash and she is ready to sail .

Standard features

Tall rig - Bill Tripp design Inboard-outboard Yamaha 15 HP 4 stroke gas engine ( completely isolated aft compartment ) Tiller steering Origo stove 110V fridge ( needs repair ) 110 V electric space heater

Extra gear included

home-made rowing dinghy Hard dodger and hard Bimini( can be removed )

Improvements to the hull, deck, rigging, engine, or interior

2007 engine 2007 sails, rigging 2019 GPS and VHF LED lights

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)

Imported by, and part of the Seafarer (USA) line. Available as sloop or yawl. (sitka spruce spars) Hulls were molded in Europe and some were finished and sold there. Some time later (1966?) the molds were purchased or leased to a firm in the UK. (Dock Plastics?) and a similar boat was sold as the SANTANDER 30. How many of this later version were built is unknown (to us).

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