The Sadler 34 Sailboat

The Sadler 34, a masthead sloop, was designed by David & Martin Sadler and built in the UK by Sadler Yachts Ltd.

'Calisto', a Sadler 34 sailboat moored in the River Yealm, Devon, UKThe Sadler 34

Published Specification for the Sadler 34

Underwater Profile: Fin with Skeg-hung Rudder

Hull Material: GRP (Fibreglass)

Length Overall: 34'9" (10.6m)

Waterline Length: 27'10" (8.5m)

Beam: 10'9" (3.3m)

Draft: 5'10" (1.8m)

Rig Type: Masthead sloop

Displacement: 12,800lb (5,806kg)

Designer: David & Martin Sadler

Builder: Sadler Yachts (UK)

Year First Built: 1983

Year Last Built: 1995 

Number Built: 260

Owners AssociationSadler and Starlight Owners Association


Published Design Ratios for the Sadler 34

1. Sail Area/Displacement Ratio: 14.6

  • 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: 39.1

  • Under 40: less stiff, less powerful
  • Over 40: stiffer, more powerful

3. Displacement/Length Ratio: 265

  • Under 100: Ultralight
  • 100 to 200: Light
  • 200 to 275: Moderate
  • 275 to 350: Heavy
  • Over 350: Ultraheavy

4. Comfort Ratio: 28.0

  • 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 all-revealing numbers...


Summary Analysis of the Design Ratios for the Sadler 34

1. A Sail Area/Displacement Ratio of just 14.6 suggests that the Sadler 34 will need a stiff breeze to get her going. In light conditions, unless you've got plenty of time on your hands, motor-sailing may be the way to go.

2. A Ballast/Displacement Ratio of 39.1 means that unless the bulk of the ballast is concentrated in a bulb at the foot of her keel, the Sadler 34 will have a tendency to heel excessively in a gust, and she'll need to be reefed early to keep her sailing upright in a moderate breeze. 

3. A Displacement/Length Ratio of 265, tells us the Sadler 34 is a moderate displacement cruiser, which means she'll carry all your cruising gear without it having a dramatic effect on her performance. Most of today's sailboats intended for offshore cruising fall into this displacement category.

4. Ted Brewer's Comfort Ratio of 28.0 suggests that crew comfort of a Sadler 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 tells us that a Sadler 34 would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0. 


Other sailboats in the Sadler range include:

Recent Articles

  1. Used Sailing Equipment For Sale

    Jan 21, 23 01:37 PM

    Here's where people with sailing equipment for sale advertise their stuff entirely free of charge. If you're looking for used sailing gear or other used boating accessories, here's where to find it!

    Read More

  2. 'Sea Wraith', a Hustler 35 Sailboat for Sale

    Jan 21, 23 08:28 AM

    The Hustler 35 sailboat is a hugely capable classic offshore cruiser. My 'Sea Wraith' has recently had an extensive mechanical and equipment refurbishment to ensure she is absolutely ready to take on…

    Read More

  3. Popular Cruising Yachts from 50-55ft (15.2m to 16.8m) Length Overall

    Jan 11, 23 09:07 AM

    Large, well-equipped cruising yachts of this size can cross oceans in relative comfort and speed, but you'll need deep pockets to operate and maintain them.

    Read More