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- Sailboat Guide
Allmand 35 is a 34 ′ 8 ″ / 10.6 m monohull sailboat designed by Walter Scott and built by Allmand Boats Inc.(USA) between 1981 and 1985.
Rig and Sails
Auxilary power, accomodations, calculations.
The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.
Classic hull speed formula:
Hull Speed = 1.34 x √LWL
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL
Sail Area / Displacement Ratio
A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.
SA/D = SA ÷ (D ÷ 64) 2/3
- SA : Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
- D : Displacement in pounds.
Ballast / Displacement Ratio
A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.
Ballast / Displacement * 100
Displacement / Length Ratio
A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
- D: Displacement of the boat in pounds.
- LWL: Waterline length in feet
Comfort Ratio
This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )
- D: Displacement of the boat in pounds
- LOA: Length overall in feet
- Beam: Width of boat at the widest point in feet
Capsize Screening Formula
This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.
CSV = Beam ÷ ³√(D / 64)
Based on the earlier CAPTIVA 35. Shoal draft: 4.16’. A ‘Raised Cabin’ Motor Sailor version was also available. Dimensions from original builders brochure.
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The Allmand 35 Sailboat Specs & Key Performance Indicators
The Allmand 35, a heavy-displacement masthead sloop, was designed by Walter Scott and built in the USA by Allmand Boats.
Published Specification for the Allmand 35
Underwater Profile: Fin keel & skeg-hung rudder
Hull Material: GRP (Fibreglass)
Length Overall: 34'9" (10.6m)
Waterline Length: 28'2" (8.6m)
Beam: 11'8" (3.6m)
Draft: 5'2" (1.6m)
Rig Type: Masthead sloop
Displacement: 15,100lb (6,849kg)
Ballast: 4,300lb (1,950kg)
Designer: Walter Scott
Builder: Allmand Boats (USA)
Year First Built: 1981
Year Last Built: 1985
Published Design Ratios for the Allmand 35
1. Sail Area/Displacement Ratio: 14.4
- 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: 28.5
- Under 40: less stiff, less powerful
- Over 40: stiffer, more powerful
3. Displacement/Length Ratio: 302
- Under 100: Ultralight
- 100 to 200: Light
- 200 to 275: Moderate
- 275 to 350: Heavy
- Over 350: Ultraheavy
4. Comfort Ratio: 29.4
- 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: 1.9
- 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 Allmand 35
1. A Sail Area/Displacement Ratio of just 14.4 suggests that the Allmand 35 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 28.5 means that a sailboat like the Allmand 35 (which doesn't have the benefit of a stiffness-enhancing bulb keel), is likely to benefit from being reefed early to keep her sailing upright in a moderate breeze.
3. A Displacement/Length Ratio of 302, tells us the Allmand 35 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 29.4 suggests that crew comfort of a Allmand 35 in a seaway is similar to what you would associate with the motion of a coastal cruiser with moderate stability, which is not the best of news for anyone prone to seasickness.
5. The Capsize Screening Formula (CSF) of 1.9 indicates that a Allmand 35 would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0.
Cruisers' Questions
What were the best-known creations of yacht designer Walter Scott?
Walter Scott was a yacht designer who worked for 30 years at Grumman Aerospace and then became the chief engineer at Irwin Yachts. He was involved with the design of many yachts from the Irwin line, such as the Irwin 10/4, the Allmand 35, and the Captiva 35. He also designed the Watkins 27, which went into production in 1977, and the Allmand 31, which appeared in 1979. He is known to have designed a number of other ‘one off’ boats. One of his most famous creations was the Ice Bear, a luxury motor yacht built by Feadship in 1988 for the late automotive entrepreneur Jim Moran.
What are the benefits of a masthead sloop whwn compared with a fractional sloop?
A masthead sloop is a sailboat with a single mast and a single headsail that is attached to the top of the mast. A fractional sloop is a sailboat with a single mast and a single headsail that is attached to a point below the top of the mast.
According to some sources, some of the benefits of a masthead sloop are:
- It has a larger jib and a larger spinnaker than a fractional sloop, which can give it a speed advantage when sailing downwind.
- It is easier to tune and more secure than a fractional sloop, because it has a backstay that directly opposes the forestay and keeps the mast in column.
- It is more common on cruising sailboats and can be considered a more traditional way to rig a boat.
Some of the benefits of a fractional sloop are:
- It has a smaller jib and a larger mainsail than a masthead sloop, which can make it easier to manage and maneuver around a racecourse.
- It gives more control over the sail shape, because the forestay tension can affect the mast bend and the mainsail flatness.
- It is more popular among racing sailboats and high-performance boats, because it can adapt to different wind conditions and sail changes better than a masthead sloop.
Of course, these are generalizations and there are pros and cons to both types of rigs. The choice depends on your sailing preferences, plans and goals.
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Designed to determine if a boat has blue water capability. The CSF compares beam with displacement since excess beam contributes to capsize and heavy displacement reduces capsize vulnerability. The boat is better suited for ocean passages (vs coastal cruising) if the result of the calculation is 2.0 or less.
Allmand 35 is a 34′ 8″ / 10.6 m monohull sailboat designed by Walter Scott and built by Allmand Boats Inc. (USA) between 1981 and 1985.
The Allmand 35, a heavy-displacement masthead sloop, was designed by Walter Scott and built in the USA by Allmand Boats. An Allmand 35. Published Specification for the Allmand 35. Underwater Profile: Fin keel & skeg-hung rudder. Hull Material: GRP (Fibreglass) Length Overall: 34'9" (10.6m) Waterline Length: 28'2" (8.6m) Beam: 11'8" (3.6m)
Decent draft for a 35' boat (only 5') with a keel halfway between a a fin and a full keel. Should be stable in a seaway. I like the offset companionway as it makes the quarterberth larger.
The Allmand 35 is a 34.75ft masthead sloop designed by W. H. Scott and built in fiberglass by Allmand Boats Inc.(USA) between 1981 and 1985. The Allmand 35 is a heavy sailboat which is slightly under powered.
Equipment: Fully functional, reliable and solid. Turnkey. Inside steering as well as cockpit. Contact me for more pics/details. Location: Marathon, Florida. L66579. 9546255357. Contact Seller.
Latest update on the Allmand 35: Water under the V-berth floor hatch was rain water coming from multiple leaking hatches and port windows. Bilge pump was not working because of dead batteries that are in process of being replaced.
The Allmand 35 pilot house is a 34.75ft cutter designed by W.H. Scott/T.R. Allmand and built in fiberglass by Allmand Boats Inc. (USA) between 1981 and 1985. The Allmand 35 pilot house is a moderate weight sailboat which is a reasonably good performer.
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Designed to determine if a boat has blue water capability. The CSF compares beam with displacement since excess beam contributes to capsize and heavy displacement reduces capsize vulnerability. The boat is better suited for ocean passages (vs coastal cruising) if the result of the calculation is 2.0 or less.