The Sadler 25 Sailboat

The Sadler 25, a masthead sloop, was designed by David Sadler and built in the UK by Sadler Yachts Ltd.

A Sadler 25 MkII sailboatA Sadler 25 Mk II fitter with a windvane self-steering gear, although a trim tab system would probably have worked well on the transom-hung rudder

Published Specification for the Sadler 25 MkII

Underwater Configuration:  Fin keel and transom-hung rudder

Hull Material: GRP (fibreglass)

Length Overall: 24' 4" / 7.4m

Waterline Length: 19' 2" / 5.8m

Beam: 8' 9" / 2.7m

Draft: 4' 8" / 1.4m

Rig Type: Masthead Sloop

Displacement: 4,000lb / 1,814kg

Designer: David Sadler

Builder: Sadler Yachts Ltd (UK)

Year First Built: 1974

Year Last Built: 1981

Number Built: 200+

Owners Association: Sadler & Starlight Owners Association

A modified version - the Sadler 25 Mk 3 - was produced in 1979 with a taller mast and consequential increase in sail area. As a result, the sail area/displacement ratio increased to 16.87 resulting in an increase in performance, particularly in light airs.

Published Design Ratios for the Sadler 25 MkII

1. Sail Area/Displacement Ratio: 15.8

  • 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: 47.6

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

3. Displacement/Length Ratio: 253

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

4. Comfort Ratio: 16.6

  • 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: 2.2

  • 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 Published Design Ratios for the Sadler 25

1. A Sail Area/Displacement Ratio of just 15.8 suggests that she'll need a stiff breeze to get her going. In any other conditions, unless you've got plenty of time on your hands, motor-sailing will be the way to go.

2. A Ballast/Displacement Ratio of 47.6 means that she'll stand up well to her canvas in a blow, helping her to power through the waves.

3. A Displacement/Length Ratio of 253, tells us she's 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 16.6 suggests that crew comfort in a seaway is similar to what you would associate with the motion of a lightweight racing boat. Upwind she'll slam enough to shake your fillings out with a motion that cruising sailors have no desire to get used to.

5. The Capsize Screening Formula (CSF) of 2.2 indicates that a Sadler 25 would not be the wisest choice of sailboat for ocean passage-making owing to the lower resistance to capsize in strong winds and heavy seas that is associated with similar sailboats that have a CSF of 2.0 and above.


Other sailboats in the Sadler range include:

Recent Articles

  1. Wharram Tiki 38 Catamaran for Sale

    Nov 30, 22 06:11 AM

    'Iko Iko' is a Wharram Tiki 38 Catamaran built in Quebec by Martin Hivon and launched in 2009. She is a gaff-rigged schooner with a....

    Read More

  2. Used Sailing Equipment For Sale

    Nov 30, 22 01:59 AM

    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

  3. Are Heavy Displacement Hulls the Best Choice for Offshore Cruising?

    Nov 27, 22 06:38 AM

    Increasingly, offshore sailboat skippers are choosing moderate displacement hull forms in preference to heavier vessels when planning for an ocean crossing. And here's why...

    Read More