1986 — 1988
Designer
Robert Perry
Builder
Ta Shing Yacht Building Ltd.
Association
Baba-Panda-Tashiba Sailboat Website
# Built
26
Hull
Monohull
Keel
Long
Rudder
?
Construction
FG
Also Known As
Tashiba 31PH, Ta Shing 31, Ta Shing 31PH

Dimensions

Length Overall
35 4 / 10.8 m
Length On Deck
30 8 / 9.4 m
Waterline Length
25 9 / 7.9 m
Beam
10 7 / 3.3 m
Draft
4 11 / 1.5 m
Displacement
13,790 lb / 6,255 kg
Ballast
4,700 lb / 2,134 kg (Iron)
Drawing of Tashiba 31
  • 1 / 7
  • 2 / 7
  • 3 / 7
  • 4 / 7
  • 5 / 7
  • 6 / 7
  • 7 / 7

Rig and Sails

Type
Cutter
Reported Sail Area
552′² / 51.3 m²
Total Sail Area
553′² / 51.3 m²
Mainsail
Sail Area
260′² / 24.2 m²
P
39 11 / 12.2 m
E
12 11 / 4 m
Air Draft
?
Foresail
Sail Area
292′² / 27.2 m²
I
45 0 / 13.7 m
J
12 11 / 4 m
Forestay Length
46 10 / 14.3 m

Auxilary Power

Make
Yanmar
Model
3GM30F
HP
27
Fuel Type
Diesel
Fuel Capacity
35 gal / 132 l

Accomodations

Water Capacity
90 gal / 341 l
Holding Tank Capacity
?
Headroom
?
Cabins
?

Calculations

Hull Speed
6.7 kn
Classic: 6.81 kn

Hull Speed

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.

Formula

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL

6.74 knots
Classic formula: 6.81 knots
Sail Area/Displacement
15.4
<16: under powered

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.

Formula

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.
15.36
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
34.1
<40: less stiff, less powerful

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.

Formula

Ballast / Displacement * 100

34.12
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
357.6
>350: ultraheavy

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.

Formula

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

  • D: Displacement of the boat in pounds.
  • LWL: Waterline length in feet
357.63
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
31.6
30-40: moderate bluewater cruising boat

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.

Formula

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)

  • 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
31.55
<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
1.8
<2.0: better suited for ocean passages

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.

Formula

CSV = Beam ÷ ³√(D / 64)

  • Beam: Width of boat at the widest point in feet
  • D: Displacement of the boat in pounds
1.78
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

From BlueWaterBoats.org:

The Tashiba 31, designed alongside her larger 36 foot sibling, represents the last of Bob Perry’s full-keeled production double-enders. Though outwardly compact, the interior is spacious with a luxurious finish that’s been a hallmark of the Taiwanese builder, Ta Shing.

Ta Shing commissioned Perry for the design of the boat and launched it in 1986. That year marked nearly a decade since the Taiwanese boatyard started a rise to prominence with the release of the popular and closely related Baba 30 double-ender (also Perry designed). It’s interesting to note despite the years that span the two designs the Baba 30 and the Tashiba 31 are mistaken to be variations on the same boat.

Make no mistakes however, the lighter and faster Tashiba 31 is wholly a different animal under scrutiny. Her hull form is a derivative of the Baba 40. Perry tells us the Baba 40 was a radical departure to his previous full keelers, the 40 was really a full-keeled evolution of the famously fast fin-keeled Valiant 40. It proved to be such a success in terms of performance and handling that Perry took the elements that worked and pushed them further. The leading edge of the keel was moved further aft, turn of the bilge got even firmer and the bow entry became finer.

In his book Yacht Design by Perry he reflects, “I think the Tashiba 31 and 36 mark the best boats I ever designed with modified full keels. The boats were fast, close-winded, stiff, and well balanced. I constantly got calls from owners telling me how they had “beat” a local contemporary design.”

The Tashiba 31 can be found in three variations. Two aft cockpit versions were offered; one with a seagoing quarter-berth (most popular) and another that had a forward stateroom and the head located aft (we’ve yet to see any of these). There was also a pilothouse version, something that’s unusual to see in a boat of this length, of which only two were built. All told, they did not sell as well as expected, at last count we found 26 boats listed in the owners registry (kindly put together by Alan Sugarman of the Baba / Panda / Tashiba owners group).

These boats (like all boats from the Ta Shing of that era) have garnered a loyal following. The build quality is exceptional and you’ll find most are in very good condition being well maintained by their owners.

Links, References and Further Reading

» Yacht Design According to Perry, by Robert H. Perry (p97-p98)
» Baba, Panda, Tashiba sailboat Yahoo Group, information and owner discussions

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