Review of Halman 20

Basic specs., sailing characteristics.

This section covers widely used rules of thumb to describe the sailing characteristics. Please note that even though the calculations are correct, the interpretation of the results might not be valid for extreme boats.

What is Capsize Screening Formula (CSF)?

The capsize screening value for Halman 20 is 2.28, indicating that this boat would not be accepted to participate in ocean races.

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 5.5 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Halman 20 is about 82 kg/cm, alternatively 461 lbs/inch. Meaning: if you load 82 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 461 lbs cargo on the boat it will sink 1 inch.

Sailing statistics

This section is statistical comparison with similar boats of the same category. The basis of the following statistical computations is our unique database with more than 26,000 different boat types and 350,000 data points.

What is Motion Comfort Ratio (MCR)?

What is L/B (Length Beam Ratio)?

What is Displacement Length Ratio?

SA/D (Sail Area Displacement ratio) Indicates how fast the boat is in light wind: - Cruising Boats have ratios 10-15 - Cruiser-Racers have ratios 16-20 - Racers have ratios above 20 - High-Performance Racers have ratios above 24 Sail-area/displacement ratio (SA/D ratio): 17.37


If you need to renew parts of your running rig and is not quite sure of the dimensions, you may find the estimates computed below useful.

This section shown boat owner's changes, improvements, etc. Here you might find inspiration for your boat.

Do you have changes/improvements you would like to share? Upload a photo and describe what to look for.

We are always looking for new photos. If you can contribute with photos for Halman 20 it would be a great help.

If you have any comments to the review, improvement suggestions, or the like, feel free to contact us . Criticism helps us to improve.

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The Aquarium San Carlos

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Dialing in a Halman 20 in San Carlos

I had the vast pleasure of sailing a Halman 20 the other day here in San Carlos. The boat came with a house purchase and I helped the new owner get the boat a bit sorted out. Halman Manufacturing Company built boats from 1978 to 1997 based out of Ontario Canada. The boats are serious little affairs and it would seem to me built to take the punishment that the great lakes can dish out to any would be sailor. Halman built 7 different models according to Sailboat Data . The boat I sailed here in San Carlos seemed as sold as a rock and had very decent performance for something so small. Even though the boat was only 20 feet long it has a slightly bigger feel to it. There was an enormous amount of space on the foredeck and it was remarkably easy to walk up there on such a small vessel. The interior was spacious and decent head room considering the size of the boat. Here is another interesting site on Halman 20’s. Apparently there are virtually no owners manuals for these boats but if you go to this link you might be able find one . This previous link has some great stories on Halman boats with one even ending up in Australia!

The following is cut and pasted from the link above:

Halman 20 Owners – Check this out!!!!  Seems that “Mr. Halmans” factory built a lot of 20 ft. boats, but didn’t build too many manuals – and probably because people were so eager to go sailing, they weren’t going to take the time to do any serious writing or reading. If he was wrong, and you really do like to read and learn something new…. then here’s something make your day! Mr. Colin Starratt has compiled a manual of notes from being a Halman owner and has graciously offered to share that with us.  If you’d like a copy, send me an e-mail at [ [email protected] ] and I’ll forward it to you. He’s done a great job in combining photos, sketches and real “meat and potatoes” perspectives from an owners viewpoint. The price to you for his work is simple, you have to send him a note of thanks and appreciation for his efforts. Absolutely the best deal you’ve run across for a long time I’d bet. The file is a “ PDF ” document and is about 40+ pages long. Thanks Colin for all of your work. Your efforts will be appreciated many times over by all of the existing and new Halman owners who read and learn from your work. As an update to this “better than free” offer, there have been a lot of requests for his manual and I hope Colin is getting his e-mail box stuffed with your notes of appreciation.

Halan Roller Furler

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  • Sailboat Guide

Halman 20 is a 19 ′ 8 ″ / 6 m monohull sailboat built by Halman Manufacturing Co. starting in 1977.

Drawing of Halman 20

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)

Design thought to be based on the NORDICA 20 though built from different tooling. The HALMAN 21, introduced in 1988, is similar but with a bowsprit. Photo courtesy Adam Hunt.

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  1. Review of Halman 20

    The DL-ratio for Halman 20 is 223 which categorizes this boat among 'light crusers & offshore racers'. 31% of all similar sailboat designs are categorized as heavier. A heavy displacement combined with smaller water plane area has lower acceleration and is more comfortable.

  2. Halman 20 v. Flicka v. Nordica 20

    The Flicka 20 is a bad ass boat. I haven't sailed one but I saw a couple of guys sail into Salem on one from Winthrop last month. It was on a day with very heavy weather (30knts plus). Nobody else was out being that it was also cold. They said they were flying on a beam reach the whole way. Wicked cool boat.

  3. Halman 20

    The boat has a PHRF racing average handicap of 276 and a hull speed of 5.4 kn (10.00 km/h). Operational history. In a review Michael McGoldrick wrote, "unlike many boats under 20 feet in length, the Halman will generally come well equipped with lifelines, winches, and other gear.

  4. Dialing in a Halman 20 in San Carlos

    Dialing in a Halman 20 in San Carlos. Posted on February 24, 2016 by Vince • 0 Comments. I had the vast pleasure of sailing a Halman 20 the other day here in San Carlos. The boat came with a house purchase and I helped the new owner get the boat a bit sorted out.

  5. Halman 20

    Halman 20 is a 6 m monohull sailboat built by Halman Manufacturing Co. starting in 1977. Designers. ? Builder. Halman Manufacturing Co. Associations. ? # Built. ? Hull. Monohull. Keel. Long. Rudder. Transom hung. Construction. FG. Dimensions. Length Overall. 6 m. Waterline Length. 5.2 m. Beam. 2.4 m. Draft. 0.9 m. Displacement. 1,134 kg. Ballast.