Cal's Evals » TELSTAR 8M

Release Date: 12/20/2004

Telstar 8M

The Telstar 8M is an early member of a family of small, folding trimarans by Tony Smith. They are fiberglass reinforced plastic sandwich construction, with wings that fold the outriggers down under the main hull for trailering. Its evaluation against the averages of eight other trimarans with overall lengths ranging from 26 to 28 feet is as follows:

Displacement: 1.25 tons [1.28 tons]

Length Overall: 26.25 feet [28.3 feet]

Length at Waterline: 24 feet [25.16 Feet]

Sail Area (Upwind): 287 sq. ft. [384 sq. ft.]

Displacement-Length Ratio: 90.42 [80.37]

Sail Area Displacement Ratio: 23.12 [31.04]

Beam between outrigger centerlines: 15.2 ft. [18.45 ft.]

Base Speed: 8.24 knots [9.31 knots]

Texel Rating: 128 [114]

Bruce Number: 1.21 [1.39]

Stability Speed: 19.06 knots [16.68 knots]

The boats used in the average are the Farrier F-25A and F-82A, Dragonfly 800, Cross 27, Newick B2, Cross 28 and Catri 26R. (See details of these boats in Multihull Data on the Multihull Dynamics, Inc. site.) The Telstar 8M is an attractive small cruising boat that the numbers show to be safe, with little potential to win races except for corrected time.

Two other comparisons were irresistible, one against catamarans of the same size and another with some feasible improvements. Twenty-one catamarans in the 24-25 foot waterline length group show a base speed of 8.78 knots and average stability speed of 16.22. The Telstar 8M would be competitive against many of these boats.

The second comparison, using postulated improvements show that extending the bow for a plumb stem and giving the boat a waterline length equal to the overall length would increase the Base Speed to 8.62 knots. Increasing the sail area to the average of 384 sq. ft. would be even more significant, boosting the base speed to 9.58 knots, but with a decreased stability speed reduced to 15.09, just below the average.

Several differences between this boat and Farriers are worth noting. The outrigger folding system is of the Swing wing design, folding downward once the boat is on the trailer, whereas the Farrier system tucks the outriggers into its armpits (sorry Ian) in or out of the water.

Pictures and information about this boat are available on numerous websites.

Calvin H. Markwood
Engineering Analyst
Multihull Dynamics, Inc.

Contact Cal: multihull.analysis@comcast.net