tornado catamaran for sale

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Sailboat Guide

1976 PantherCraft Tornado Sport Rig

Description

Seller's Description

The Tornado Catamaran is one of the fastest production sailboats in the world. The Tornado was used as the equipment for the multihull discipline in the Olympic Games from 1976 through 2008. The rig was modified in 2001 to increase the Tornado’s performance even further with a new sail plan which included a spinnaker and spinnaker boom, as well as an increased sail area of the existing sails. An additional trapeze was also added, and the jib was made self tacking. Perfect if you are looking for a little more speed. This is a 70’s era Tornado built by PantherCraft in the UK. The boat has been upgraded to the Sport Rig with the square-top main, spinnaker, and self-tacking Jib as used in the Olympics. It would be a good choice for a sailor on a budget.Square-top Main and Self-tacking jib – Built by Elliot/Pattinson Sailmakers (High performance sailcloth, not class legal) Crispy Spinnaker – Built by Giorgio Zuccoli/Ullman Sails Italy Snuffer - Landenberger One Design - Dacron sleeve needs to be replaced Hulls – Painted, could be repainted Rudders and centerboards - fiberglass covered wood Rudder stocks – SailCraft of Canada Mast – Aluminum Standing Rigging - Excellent Trapeze wires – Vinyl covered stainless w/ Hi-Low Trapeze Adjustment Running rigging – Tapered mainsheet, tapered spinnaker sheets Trampoline – excellent, sewn with Teflon thread, no UV damage Boat covers – no special fitted covers, always used poly tarps. Trailer – 2006 Galvanized tilt trailer, new torsion bar suspension axle 2021 Boat and trailer are both registered with titles

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)

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