1970 — 1981
Designer
Tony Smith
Builder
Sandwich Yacht (UK)
Associations
?
# Built
200
Hull
Trimaran
Keel
Centerboard
Rudder
?
Construction
FG

Dimensions

Length Overall
26 2 / 8 m
Waterline Length
24 0 / 7.3 m
Beam
16 0 / 4.9 m
Draft
?
Displacement
2,800 lb / 1,270 kg
Ballast
20 lb / 7 kg
Drawing of Telstar 8M
  • 1 / 1

Rig and Sails

Type
Sloop
Reported Sail Area
370′² / 34.4 m²
Total Sail Area
?
Mainsail
Sail Area
?
P
?
E
?
Air Draft
?
Foresail
Sail Area
?
I
?
J
?
Forestay Length
?

Auxilary Power

Make
?
Model
?
HP
?
Fuel Type
?
Fuel Capacity
?

Accomodations

Water Capacity
?
Holding Tank Capacity
?
Headroom
?
Cabins
?

Calculations

Hull Speed
10.0 kn
Classic: 6.57 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

9.98 knots
Classic formula: 6.57 knots
Sail Area/Displacement
29.8
>20: high performance

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.
29.8
<16: under powered
16-20: good performance
>20: high performance
Ballast/Displacement
0.6
<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

0.55
<40: less stiff, less powerful
>40: stiffer, more powerful
Displacement/Length
90.2
<100: Ultralight

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
90.24
<100: ultralight
100-200: light
200-300: moderate
300-400: heavy
>400: very heavy
Comfort Ratio
4.3
<20: lightweight racing 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
4.33
<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
4.5
>2.0: better suited for coastal cruising

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
4.54
<2: better suited for ocean passages
>2: better suited for coastal cruising

Notes

The TELSTAR was designed and built by Tony Smith in Britain from the early 70’s through about 1980.
The UK TELSTAR production was somewhere around 200 boats - first there was the TELSTAR 26 and around 1977 the TELSTAR 8m, which featured a fatter/roomier main hull. There was also a TELSTAR 35 and a version of the 8m which had outer hulls which pulled in close to the main hull while the boat was in the water, but few were built. Tony emigrated to the US and set up Performance Cruising in Maryland. There may have been 10 TELSTARS built in the US in late 1980 to mid-1981 (serial numbers 250 through 259 or 260). The factory burned down in mid-1981, and all molds were lost (Tony started building the GEMINI catamarans after the fire).

Type Year Hull #s LOA Sail Area Weight Comments

Prototype 1970 001 26’ 298 ? Entered Crystal Trophy

MK 1 1970-1975 002 - 080 26’ 340 3500 Std boat. In production 3 years.

MK 2 1976-1977 083 - 171 26’ 300 2800 Floats lengthened?

Marina
Version 1978-1979 009 & 187 ? ? ? Folding amas.

Mk 3 1978-1979 172 - ? 8m ? ? Enclosed c/b trunk. Wider center hull.

8 meter
(Std) 1978-1980 172-216 8m ? ? Standard 8meter. Heavier than later versions.

8 meterE 1980 184 + 8m 285/320 ? Economy lightweight. Tall rig (34’)

8 meter/Std 1981 250-260 8m ? ? Standard boat produced in USA.

T 36 1978 T35 (1 - 8) 35’ 470 11000

A new TELSTAR 26 is now available from:

Performance Cruising Inc.
7364 Edgewood Road
Annapolis,Maryland 21403
410.626.2720
www.geminicatamarans.com

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