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- Sailboat Guide
Sirius 21/22
Sirius 21/22 is a 20 ′ 11 ″ / 6.4 m monohull sailboat designed by Hubert Vandestadt and built by Vandestadt and McGruer Ltd. between 1977 and 1987.
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)
Vandestadt & McGruer was the Canadian importer of the American built MacGregor line of trailerable sailboats in early 1970s. The company also built the SIREN 17. The SIRIUS 21/22 is said to be the first North American production-built, ballasted cruising boat with positive flotation. In a more expensive procedure, closed-cell foam was injected into some compartments, then into the gap between the inner and outer hull the full length and up to the deck level. In the early 1980s, the hull was modified to include a reverse sheer transom at which point the boat was renamed the SIRIUS 22. A fixed-keel model was also offered.
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Sirius 21/22
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Specifications SIRIUS 21/22 (CAN)
1977 - 21.00 ft / 6.40 m - Vandestadt - Vandestadt and McGruer Ltd.
SIRIUS 21/22 (CAN) Sailboat Data
Hull Type: Swing Keel Rigging Type: Masthead Sloop LOA: 21.00 ft / 6.40 m LWL: 18.75 ft / 5.72 m S.A. (reported): 205.00 ft² / 19.05 m² Beam: 7.92 ft / 2.41 m Displacement: 2,000.00 lb / 907 kg Ballast: 525.00 lb / 238 kg Max Draft: 5.00 ft / 1.52 m Min Draft: 1.33 ft / 0.41 m Construction: FG Ballast Type: Iron First Built: 1977 Last Built: 1987 # Built: 500 Builder: Vandestadt and McGruer Ltd. Designer: Vandestadt
Information from sailboatdata.com .
Hull Speed: 5.80 kn
IMAGES
VIDEO
COMMENTS
The SIRIUS 21/22 is said to be the first North American production-built, ballasted cruising boat with positive flotation. In a more expensive procedure, closed-cell foam was injected into some compartments, then into the gap between the inner and outer hull the full length and up to the deck level. In the early 1980s, the hull was modified to ...
The company also built the SIREN 17. The SIRIUS 21/22 is said to be the first North American production-built, ballasted cruising boat with positive flotation. In a more expensive procedure, closed-cell foam was injected into some compartments, then into the gap between the inner and outer hull the full length and up to the deck level.
Canadian-built trailer sailboats include the CS 22, Tanzer 22, as well as various models from C&C, Paceship, Abbott, Grampian, Viking, Mirage and Northstar. One gem is the Sirius 21/22 built by Vandestadt and McGruer Ltd. of Owen Sound, Ont. a company which had a strong 25-year history before finally closing its doors in 1987.
In a 2002 review Paul Howard wrote, "one gem is the Sirius 21/22 built by Vandestadt and McGruer Ltd. of Owen Sound, Ont. a company which had a strong 25-year history before finally closing its doors in 1987. Designed at Vandestadt, the Sirius 21/22 was an innovative boat and indeed is said to be the first North American production-built ...
The Sirius 21 is a trailer sailer/compact cruiser designed and built here in Ontario. I've owned it nearly a year and it's been a ... Tour of my 1979 Sirius 21. The Sirius 21 is a trailer sailer ...
Sell Your Boat Used Gear for Sale. ... Main Sheet Swivel/Block/ cleat- 1981 Sirius 21. SailSK; Jan 17, 2023; 7. Replies 7 Views 981. Feb 6, 2023. SailSK. S. S ...
Collection of sailing videos I've taken of the Sirius 21 this past sailing season. I have since sold the boat because I took an opportunity to own a differen...
Sail Pack Kit - Standard Sunbrella® Color (10' Boom) Spinnaker Sock Kit 24' 1" to 27'. Foredeck Sail Bag Kit - Standard Sunbrella® Color (For Boats up to 30') Complete Sail Plan Data for the Sirius 21 Sail Data. Sailrite offers free rig and sail dimensions with featured products and canvas kits that fit the boat.
Rating (PHRF-LO) : 258. Price range: $7,000 to $9,500. (with trailer) The Sirius 21 was designed for, and manufactured by Vandestadt & McGruer, the company which had been the Canadian importer of the American built MacGregor line of trailerable sailboats in early 1970s. The company, which also built the Siren 17, obviously knew what people were ...
SIRIUS 21/22 (CAN) Sailboat Data Hull Type: Swing Keel Rigging Type: Masthead Sloop LOA: 21.00 ft / 6.40 m LWL: 18.75 ft / 5.72 m S.A. (reported): 205.00 ft² / 19.05 ...