BoatsSeidelmann Yachts 34

Seidelmann Yachts 34

Masthead Sloop · Fin keel, spade rudder · First built 1981

A 1981 masthead sloop with a 45% ballast ratio, balancing a light-displacement hull with a deep 1.65-metre fin keel

Designed by J. Robert Seidelmann.

LOA
Beam
Draft (max)
Displacement
Ballast
Hull type
Fin w/spade Rudder

See her sail

The Seidelmann Yachts 34, on the water

The fleet's own footage — the truest look at how she really moves.

Footage from Eternal Sailing

Is it for you?

Character

Where this design lands on the numbers a shopper trusts — read straight from her own ratios.

LivelySea-kindly

Her moderate displacement on a moderate beam gives 22 — a moderate, middle-of-the-road motion.

Comfort ratio 22
CoastalBluewater

2.13 — right around the 2.0 line, the edge between coastal and offshore.

Capsize screening 2.13
LightHeavy

264 — moderately heavy for her waterline, a balanced cruising weight.

Displacement / length 264
EasygoingPowered-up

16.8 — moderate power for her weight; steady, all-round performance.

Sail area / displacement 16.8
TenderStiff

45% of her weight is ballast — stiff, standing up well to her sails.

Ballast 45%

A balanced, easily-driven cruiser — comfortable and forgiving for coastal work.

What the fleet has seen

The Seidelmann Yachts 34, as the fleet has seen it

Derived from the videos the fleet has analysed of this model. ▶ marks open the moment aboard.

The Seidelmann Yachts 34 is a masthead sloop with a fin keel and spade rudder, designed by J. Robert Seidelmann and built by Seidelmann Yachts from 1981 to the present. It measures 10.4 meters LOA, with a 3.6-meter beam, 1.6-meter draft, and 4989 kg displacement.watch

The living fleet

Sailed by the fleet

Where the fleet has filmed this boat.

Seen 2 times across one channel of the fleet.

Basemap © Wikimedia Commons · CC BY-SA 4.0

On the water

The Seidelmann Yachts 34 on video

What they go for

Market signal

Where the fleet has seen this model come up for sale.

1seen sold

From the fleet's own footage — our observed signal, not broker listings.

The record

Full specifications

The complete reference set — tap any figure to switch between metric and imperial.

Dimensions
Weights
Ballast / displacement
45.5%
Rig & sail area
Rig
Masthead Sloop
Ratios
SA / displacement
16.8
Displacement / length
263.9
Comfort ratio
22.0
Capsize screening
2.13
Hull speed
6.9 kn
Pounds / inch immersion
1119
Hull
Hull type
Fin w/spade rudder
Construction
Fiberglass
Production
Years built
First built 1981
Designer
J. Robert Seidelmann
Builder
Seidelmann Yachts

Boats like this, on the water

More boats like her, on the water

Comparable boats the fleet has on camera: same type, within a quarter of her length. Open the boat, or watch the video — a timestamp means she only appears in passing.

Moody 3410.19 mSame hull family0.2 m shorterA 1980s mid-sized cruiser with a 40% ballast ratio, designed for stability and predictable handling in coastal waters
Moody or Beneteau? - Episode 122 - Lady K Sailing10:36from Lady K Sailing
Sadler Yachts 3410.59 mSame hull family0.2 m longerA robust masthead sloop designed by the Sadlers, featuring a skeg-hung rudder and a balanced hull for offshore cruising
Anchored in New York - We're staying here! ❤️ Sailing in the USA ⛵️🇺🇸0:17from Eternal Sailing
Moody 34610.52 mSame hull family0.2 m longerA 10.5-metre masthead sloop with a 40% ballast ratio, offering a stable and comfortable platform for coastal cruising
Moody 346 - A Yacht Delivery from Sardinia to Greece (Via Albania).0:50from Halcyon Yachts - International Yacht Delivery
Victoria Marine 3410.44 mSame hull familyNear-identical lengthA versatile cruiser available as a masthead sloop or cutter, featuring a shallow 1.47m draft and a skeg-hung rudder
Episode 3 - Rachael Sprot15:24from SheHelms Sailing
Cal Boats 3410.13 mSame hull family0.2 m shorterA masthead sloop with a fin keel and spade rudder, favoured by Jensen Marine founder Jack Jensen for personal cruising
Episode 1 - Sadie Johnson5:11from SheHelms Sailing
Tartan Marine 34-210.49 mSame hull familyNear-identical lengthA Sparkman & Stephens masthead sloop featuring an extended stern and refined interior based on the Tartan 33R
Teak and Holly Sole Repair The RIGHT Way! Sailboat DIY Projects0:45from Practical Sailor

The family

Boats like this

Nearby designs by size, type, and era — worth a look alongside her.

Seidelmann Yachts 37A light-displacement masthead sloop designed for performance with a high sail-area-to-displacement ratioSeidelmann Yachts 30-TA 30-foot masthead sloop with a 1.65-meter draft, optimized for stability with a 40% ballast ratioSeidelmann Yachts 25A masthead sloop designed by J. Robert Seidelmann, featuring a fin keel and spade rudder for balanced coastal cruisingSeidelmann Yachts 299A 9.12-metre fin-keel sloop built from 1979 to 1981, offering a balanced 2.2 capsize screening for coastal passagesSeidelmann Yachts 295A masthead sloop with a centerboard keel designed by J. Robert Seidelmann for versatile shoal and deep water sailingSeidelmann 30A maxi MORC centreboard design from 1977 featuring a spacious 3.66-metre beam and a custom interior by Stott Carleton

Keep asking

The fleet has more to say

Search what's been said about the Seidelmann Yachts 34, or ask a specific question — the answer comes back written out, with links to the moments it draws on.

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