The Tartan 34 Sailboat
Specs & Key Performance Indicators
The Tartan 34 was designed by Sparkman & Stephens and built in the USA by Tartan Marine.
A Tartan 34
The Tartan 34 shown here is a 34C indicating that she is a 34 'Classic', the first of the 34's. Two further versions followed, the 34-2 and the 3400. The 3400 was later renamed the 345.
The following specs and data relate to the 34C.
Published Specification for the Tartan 34
Underwater Profile: Centreboard keel with rudder on full skeg
Hull Material: GRP (Fibreglass)
Length Overall: 34'5" (10.5m)
Waterline Length: 25'0" (7.6m)
Beam: 10'2" (3.1m)
Draft: 8'4" (2.5m)
Rig Type: Masthead sloop
Displacement: 11,200lb (5,080kg)
Designer: Sparkman & Stephens
Builder: Tartan Marine (USA)
Year First Built: 1968
Year Last Built: 1978
Number Built: 525
Published Design Ratios for the Tartan 34
1. Sail Area/Displacement Ratio: 16.9
- Less than 16 would be considered under-powered;
- 16 to 20 would indicate reasonably good performance;
- Over 20 suggests relatively high performance.
2. Ballast/Displacement Ratio: 44.6
- Under 40: less stiff, less powerful
- Over 40: stiffer, more powerful
3. Displacement/Length Ratio: 320
- Under 100: Ultralight
- 100 to 200: Light
- 200 to 275: Moderate
- 275 to 350: Heavy
- Over 350: Ultraheavy
4. Comfort Ratio: 28.3
- Under 20 indicates a lightweight racing boat
- 20 to 30 indicates a coastal cruiser
- 30 to 40 indicates a moderate offshore cruising boat
- 40 to 50 indicates a heavy offshore boat
- Over 50 indicates an extremely heavy offshore boat
5. Capsize Screening Formula: 1.8
- Under 2.0 (the lower the better): Better suited for ocean passages
- Over 2.0: Less suited for ocean passages
Read more about these Key Performance Indicators...
Summary Analysis of the Design Ratios for the Tartan 34
1. A Sail Area/Displacement Ratio of 16.9 suggests that the Tartan 34 will, in the right conditions, approach her maximum hull speed readily and satisfy the sailing performance expectations of most cruising sailors.
2. A Ballast/Displacement Ratio of 44.6 means that the Tartan 34 will stand up well to her canvas in a blow, helping her to power through the waves.
3. A Displacement/Length Ratio of 320, tells us the Tartan 34 is clearly a heavy displacement cruising boat. You can load her down with all your cruising gear and equipment and it will hardly affect her waterline. Not an ideal choice for coastal sailing, but she'll come into her own on an offshore passage in testing conditions.
4. Ted Brewer's Comfort Ratio of 28.3 suggests that crew comfort of a Tartan 34 in a seaway is similar to what you would associate with the motion of a coastal cruiser with moderate stability, which is not encouraging news for anyone prone to seasickness.
5. The Capsize Screening Formula (CSF) of 1.8 indicates that a Tartan 34 would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0.
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