The Allied Princess 36 Mk 2
 Sailboat

The Allied Princess 36, a long-keeled ketch, was designed by Arthur Edmunds and built in the USA by Allied Yachts.

The Allied Seawind 36 MkII ketch under full sail'Gabriel', an Allied Seawind 36 MkII ketch under full sail.

The MkII was introduced in 1980, distinguishing itself from the earlier version by the addition of a bowsprit. Both versions were available as either cutters or ketches.

Published Specification for the Allied Princess 36 MkII

Underwater Profile: Long keel.

Hull Material: GRP (Fiberglass)

Length Overall: 37'7" / 11.5m

Waterline Length: 27'6" / 8.4m

Beam: 11'0" / 3.4m

Draft: 5'1" / 1.6m

Rig Type: Masthead ketch

Displacement: 15,400lb / 6,985kg

Designer: Arthur Edmunds

Builder: Allied Yachts (USA)

Year First Built: 1972

Year Last Built: 1984

Number Built: 140+


Published Design Ratios for the Allied Princess 36 MkII

1. Sail Area/Displacement Ratio: 16.4

  • 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: 34.7

  • Under 40: less stiff, less powerful
  • Over40: stiffer, more powerful

3. Displacement/Length Ratio: 309

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

4. Comfort Ratio: 30.4

  • 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 Allied Princess 36

1. A Sail Area/Displacement Ratio of 16.4 suggests that the Allied Princess 36 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 34.7 means that the Allied Princess 36 will stand up well to her canvas in a blow, helping her to power through the waves.

3. A Displacement/Length Ratio of 309, tells us the Allied Princess 36 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 30.4 suggests that crew comfort of an Allied Princess 36 in a seaway is similar to what you would associate with the motion of a moderate bluewater cruising boat - a predictable and acceptable motion for most seasoned sailors.

5. The Capsize Screening Formula (CSF) of 1.8 tells us that an Allied Princess 36 would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0. 

Cruisers' Questions

What are the benefits and advantages of the ketch rig over the sloop rig?

Some of the benefits and advantages of a ketch rig over a sloop rig are:

  • A ketch rig can carry more sail area than a sloop rig, but with smaller sails that are easier to handle and reef.
  • A ketch rig can offer more flexibility and versatility in sail combinations for different wind conditions and points of sail.
  • A ketch rig can balance the boat better by adjusting the mizzen sail, which can reduce weather helm and improve steering.
  • A ketch rig can sail better off-wind than a sloop rig, as the mizzen sail can catch more wind without being blocked by the mainsail.
  • A ketch rig can look more aesthetically pleasing and traditional than a sloop rig.

Some of the disadvantages and drawbacks of a ketch rig compared to a sloop rig are:

  • A ketch rig is generally slower and less efficient than a sloop rig when sailing upwind, as the mizzen sail can create turbulence and drag on the mainsail.
  • A ketch rig has more standing and running rigging than a sloop rig, which means more maintenance and cost.
  • A ketch rig takes up more space on the boat with the extra mast, which can reduce cockpit or cabin room.
  • A ketch rig is less common than a sloop rig on the market, which can limit the choices and availability of boats.

Who is Ted Brewer and what is 'The Comfort Ratio'?

Ted Brewer is a yacht designer who has created a formula to assess a boat's comfort at sail. The comfort ratio is based on the fact that the faster the motion of the boat, the more upsetting it is to the average person. The comfort ratio is calculated as follows:

Comfort ratio = Displacement (lbs)/ [0.65 * (0.7LWL + 0.3LOA) * B1.333]

Where LWL is the length at waterline, LOA is the length overall, and B is the beam or width of the boat. A higher comfort ratio means a more comfortable boat in rough seas, but also a slower and heavier boat. A lower comfort ratio means a faster and lighter boat, but also a more lively and jerky motion.

Other sailboats in the Allied range include:

Allied Seawind MkII sailboat - anchoredThe Allied Seawind 32

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