Viking 33 – a C&C Designed Racer Cruiser
Overall both the Viking 33 and Viking 34 are equally fast for their era with a Displacement to Length ratio of 195-200 and a Sail Area to Displacement of 19-20. Many racer Cruisers of the day were heavier for their size sporting Displacement to Length ratios in the 225 to 250 range and lower Sail Area to displacement ratios.
By contrast, modern Racer Cruisers (eg. J97, Beneteau 10R, C&C 99, & Tartan 101) are much faster with
- significantly lower placed ballast
- longer effective waterlines, and
- wider stern sections allowing the boats to plane at higher windspeeds.
Viking 33 and 34s can hold their own with any number of very popular designs including:
- C&C 33-1, 33-2 & 34, as well as C&C 35 MK 1, 2 & 3
- Euro Style Beneteau First 325, 345, 310 and 31.7s,
- Canadian Sailcraft CS36 Traditional and Merlins
- Pure racing Abbott 33s and Santana 30/30s
- Smaller and lighter J30, S2 9.1, Frers 30/Star 30 and Olson 911s
At a very similar rating and design to the Vikings, the C&C 35 mk1 polar diagram gives a fairly accurate idea of how well the Viking 33 and 34 will perform at various apparent wind speeds and sailing angles. (with thanks to the Detroit C&C 35 Association) http://candc35.com/
The maximum hull speed for a Viking is theoretically only 7 knots, but owners know they will do 8.3-8.4 knots in displacement mode without having to surf.
A theoretical hull speed calculation works well for a heavy boats with a displacement to length ratio around 340. (eg. a Pacific Seacraft) With that much water to push, a sail boat will likely only sail as fast as the speed of a wave as long as the distance between its bow and stern waves (waterline length).
Lighter boats are faster; and a better formula laid out in Gerr’s Marine’s propeller handbook takes that into account; click to see a more Accurate Hull Speed Formula
So, while a Viking 33 or 34 will arrive a fair bit later than a similar size modern Racer/Cruiser such as a J97, Tartan 101, C&C 99 or a Beneteau 10R, it will move along at a good clip getting you to your destination faster than most every modern Cruiser on the market.
Whereas modern boats come with a STIX stability rating as part of the paperwork, there is no such ready source for older boats. The Viking 33 and 34 are indeed very stable boats with a:
- Ballast to Displacement over 50%,
- Capsize screening value under 2.0, and
- An Estimated Angle of Vanishing Stability of 124 degrees
The most compelling of these is perhaps the Angle of Vanishing Stability AVS (or Limit of Positive Stability). The AVS angle is an estimate of how far a sailboat would have to roll from upright before it kept going and capsized.
Again we turn to Gerr Marine, this time for their take on the Wolfson formula for estimating AVS. Assuming you are not afraid of a scientific calculator you can check my estimate above, or find the estimated AVS for your boat using the calculation formula AVS Calculation Formula