
The Tashiba is a long-keeled cutter sailboat designed by Bob Perry and built in Taiwan by Ta Shing Yacht Builders. The Tashiba comes in 31, 36, and 40-foot models, all of which are monohull designs. The 31-foot model was built between 1986 and 1988, while the 36-foot model was introduced in 1986. The Tashiba 40, the largest of the three models, has a displacement of 29,000 lbs, a waterline length of 34'6, and a sail area of 865 sq ft. All three models are known for their spacious interiors and luxurious finishes. When choosing a Tashiba boat, it is important to consider factors such as the intended use, performance specifications, and personal preferences.
Characteristics | Values |
---|---|
Length | 35′ 4″ / 10.8 m (Tashiba 31) or 35′ 11″ / 11 m (Tashiba 36) |
Weight | 13,790 lb / 6,255 kg (Tashiba 31) or 20,350 lb / 9,231 kg (Tashiba 36) |
Sail Area/Displacement Ratio | 16-20: good performance, >20: high performance |
Ballast/Displacement Ratio | <40: less stiff, less powerful, >40: stiffer, more powerful |
Displacement/Length Ratio | 30-40: moderate bluewater cruising boat |
Comfort Ratio | <20: lightweight racing boat, 20-30: coastal cruiser, 30-40: moderate bluewater cruising boat, 40-50: heavy bluewater boat, >50: extremely heavy bluewater boat |
Capsize Screening Formula | <2: better suited for ocean passages, >2: better suited for coastal cruising |
Build Material | Hand-laminated fiberglass hull, GRP (fiberglass) underwater profile, GRP and cored with end-grain balsa deck |
Builder | Ta Shing Yacht Building Ltd. |
Year First Built | 1986 (Tashiba 36) or 1984 (Tashiba 40) |
What You'll Learn
Sail area/displacement ratio
When picking a Tashiba boat, it is important to consider its Sail Area-Displacement Ratio (SA/D). This ratio is a calculation used to express how much sail a boat carries relative to its weight. It is an indicator of the boat's performance—the higher the SA/D, the more powerful the boat.
The SA/D is a "non-dimensional" value, meaning it facilitates comparisons between boats of different types and sizes. For example, a 30-foot boat with an SA/D of 20 will have just as powerful a rig as a 60-foot boat with the same SA/D.
In general, a boat with an SA/D under 15 would be considered under-canvased, while values above 15 indicate reasonably good performance. Anything above 18-20 suggests high performance, provided the boat has sufficient stability and a low enough displacement-length ratio to take advantage of its abundant sail area.
The Tashiba 31, for instance, has a sail area of 552.50 ft² and a displacement of 13,790 lb. This gives it an SA/D of around 16.7, which indicates reasonably good performance.
The SA/D is an important consideration when choosing a boat, as it gives an idea of how the boat will perform under sail. However, it does not provide information about how the boat will behave in a storm or upwind. For a more precise understanding of the boat's performance, other factors such as hull speed, ballast/displacement ratio, and displacement/length ratio should also be taken into account.
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Ballast/displacement ratio
When selecting a Tashiba boat, it is important to consider the ballast/displacement ratio. This ratio is a critical factor in determining the stability, stiffness, and overall performance of the boat.
The ballast/displacement ratio indicates the amount of weight placed in the boat to maximise stability and minimise the risk of capsizing. A higher ratio translates into a stiffer and more powerful boat that can better withstand strong winds and rough seas.
For the Tashiba 31, a ballast/displacement ratio of less than 40 would indicate a less stiff and less powerful boat, while a ratio above 40 would mean a stiffer and more powerful vessel. The ballast/displacement ratio for the Tashiba 31 is calculated as follows:
> Ballast/Displacement Ratio = Ballast (lbs) / Displacement (lbs) * 100
For example, if the ballast is 4,700 lbs and the displacement is 13,790 lbs, the calculation would be as follows:
> Ballast/Displacement Ratio = 4700 / 13790 * 100 = 34.08
So, for this example, the Tashiba 31 would be considered less stiff and less powerful, as the ratio is less than 40.
Similarly, for the Tashiba 40, a ballast/displacement ratio of 40 or more is desirable for a stiffer and more powerful boat. The calculation method is the same as for the Tashiba 31.
When choosing a Tashiba boat, it is essential to consider your intended usage and the sailing conditions you are likely to encounter. If you plan to sail in strong winds or rough seas, selecting a boat with a higher ballast/displacement ratio will provide a stiffer, more powerful, and stable platform. Conversely, if you intend to sail in calmer waters and prioritise manoeuvrability over stiffness, a lower ballast/displacement ratio may be more suitable.
Additionally, it is worth noting that the ballast/displacement ratio is just one aspect of boat design and performance. Other factors, such as sail area, hull design, and overall weight, also play a significant role in the boat's overall performance and should be considered when making a purchase decision.
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Displacement/length ratio
When selecting a Tashiba sailboat, it is important to consider its Displacement/Length ratio (D/L ratio). This ratio is a tool used by yacht designers to evaluate the boat's performance and characteristics. The D/L ratio measures how heavy a boat is relative to its waterline length, and it is calculated by dividing the boat's displacement in long tons (2,240 pounds) by the cube of one one-hundredth of the waterline length (in feet).
The D/L ratio provides a more nuanced understanding of the boat's performance. A lower D/L ratio indicates that less power is required to drive the boat to its nominal hull speed, and it is more likely to exceed that speed. Conversely, a higher D/L ratio means the boat can carry a heavier load more comfortably. For cruising, a moderate D/L ratio is generally recommended, with coastal boats favouring the lower end and offshore boats the higher end of this range.
- Ultralight: Below 100
- Light: 100-200
- Moderate: 200-300
- Heavy: 300-400
- Ultraheavy: Above 400
Additionally, the D/L ratio can be used to compare the relative "heaviness" of boats, regardless of their size. For example, two boats with the same D/L ratio but different waterline lengths would be considered equally heavy relative to their respective waterline lengths.
When evaluating boats based on their D/L ratios, it is important to use a realistic displacement value, as the ratio can vary significantly depending on the displacement used in the calculation. It is recommended to correct the displacement figure published by the boat's builder upwards to account for the load the boat normally carries when sailing.
In summary, the Displacement/Length ratio is a crucial factor to consider when choosing a Tashiba boat, as it provides insights into the boat's power requirements, speed potential, load capacity, and comfort level during cruising.
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Comfort ratio
The comfort ratio is a measure of motion comfort, comparing yachts of similar size and type. It was created by Ted Brewer and is based on the fact that faster motion is more upsetting to the average person. The comfort ratio formula is:
> Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam^1.33)
Where:
- D = Displacement of the boat in pounds
- LWL = Waterline length in feet
- LOA = Length overall in feet
- Beam = Width of boat at the widest point in feet
The comfort ratio categorises boats as follows:
- Numbers below 20 indicate a lightweight racing boat, small dinghy, etc.
- 20 to 30 indicates a coastal cruiser
- 30 to 40 indicates a moderate bluewater cruising boat
- 40 to 50 indicates a heavy bluewater boat
- Over 50 indicates an extremely heavy bluewater boat
The comfort ratio is one of several specifications to consider when choosing a boat. The Tashiba 31, for example, is a 35' 4" monohull sailboat with a comfort ratio of 30-40, categorising it as a moderate bluewater cruising boat. The Tashiba 40, on the other hand, has a comfort ratio of 41.5, which is high for a cruising boat, meaning it has a smooth and gentle motion in waves but a slow and heavy feel at the helm.
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Capsize screening formula
The Capsize Screening Formula (CSF) is a method of determining a boat's ability to resist capsizing. It is calculated using the following formula:
CSF = Beam / ((Displacement/64.2)1/3)
Where the beam is the width of the boat at its widest point, and displacement is the weight of the boat in pounds. The resulting value indicates the boat's suitability for ocean racing. A CSF value of less than or equal to 2 is considered suitable for ocean passages, while values greater than 2 are more suitable for coastal cruising.
It's important to note that the CSF is a "`rough`" estimate and does not consider factors such as hull shape or ballast location. As a result, two boats with the same CSF may have very different stability characteristics due to differences in hull design and ballast configuration.
The CSF came into use after the 1979 Fastnet race in England, where a storm caused the destruction of many yachts, with 75 out of 303 yachts capsizing. The Cruising Club of America (CCA) developed the CSF to compare boats based on readily available data, specifically their beam and displacement.
While the CSF is a widely used screening tool, it is controversial due to its simplicity and lack of consideration for other factors influencing a boat's stability. More comprehensive stability assessments, such as the EU's STIX index, consider a wider range of factors but require more detailed information.
When choosing a Tashiba boat, or any boat for that matter, understanding the capsize screening formula and other stability indicators is crucial to ensure the vessel is suitable for its intended use and provides a safe boating experience.
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Frequently asked questions
The Tashiba 40 sailboat was designed by Bob Perry and built in Taiwan by Ta Shing Yacht Builders. It has a long keel, a canoe stern, and is made of GRP (Fiberglass). It has a length of 39'10" (12.2m), a waterline length of 34'6" (10.5m), and a displacement of 29,000lb (13,154kg).
The Sail Area/Displacement Ratio (SA/D) of the Tashiba 40 is 14.7, which indicates that the boat is slightly underpowered and will need a good breeze to get moving. The Ballast/Displacement Ratio (BR) is 35.5%, which means the boat has enough ballast to handle rough seas without compromising performance. The Displacement/Length Ratio (D/L) is 315, indicating that the boat is heavy and spacious but also slow and hard to push through the water. The Comfort Ratio (CR) is 41.5, suggesting that the boat has a smooth motion in waves but a slow and heavy feel. Finally, the Capsize Screening Formula (CSF) is 1.7, indicating that the boat is very stable and unlikely to capsize.
The Tashiba 31 is a monohull sailboat designed by Robert Perry and built by Ta Shing Yacht Building Ltd. between 1986 and 1988. It has a length of 35'4" (10.8m) and a displacement of 13,790 lb (6,255 kg). The Sail Area/Displacement Ratio (SA/D) is used to measure the power of the sails relative to the weight of the boat. A higher ratio indicates higher performance but also more difficulty in handling. The Ballast/Displacement Ratio measures the stability of the boat, with a higher ratio indicating a stiffer and more powerful boat. The Displacement/Length Ratio measures the weight of the boat relative to its length, with a higher ratio indicating more volume and carrying capacity. The Comfort Ratio measures the comfort of the boat's motion in a seaway, with a higher ratio indicating more comfort but also more inertia.