YachtDatabase.com

Review of Tumlaren


Tumlaren
Tumlaren anno 1936.

Basic specs.

sail specifications
The Tumlaren is a sailboat designed by the Swedish maritime architect Knud Hielmberg Reimers in the mid thirties. Several hundred boats have been produced.

Looking for a new boat? Find a Tumlaren or similar boat for sale

Hull

The hull is made of wood.


Interior

The boat is equipped with 4 berths.


Rig

The Tumlaren is equipped with a fractional rig. A fractional rig has smaller headsails which make tacking easier, which is an advantage for cruisers and racers, of course. The downside is that having the wind from behind often requires a gennaker or a spinnaker for optimal speed.


Keel

Full keel

The Tumlaren is equipped with a long keel. A full keel provide a better directional stability than a similar boat with a fin keel; on the other hand, better directional stability means also that the boat is more difficult to handle in a harbour with less space.

The keel is made of lead. Compared with iron, lead has the advantage of being 44% heavier, which allows a smaller keel and hence less water resistance and higher speed.

The boat can enter even shallow marinas as the draft is just about 1.30 - 1.40 meter (4.27 - 4.57 ft) dependent on the load. See immersion rate below.


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.

Stability and Safety

What is Capsize Screening Formula (CSF)?

The capsize screening value for Tumlaren is 1.56, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.


Theoretical Maximum Hull Speed

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 6.2 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.


Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Tumlaren is about 84 kg/cm, alternatively 470 lbs/inch.
Meaning: if you load 84 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 470 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.

Motion Comfort Ratio

What is Motion Comfort Ratio (MCR)?

The Motion Comfort Ratio for Tumlaren is 23.5.

Low High 66% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 66% of all similar sailboat designs. This comfort value is just above average.


L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Tumlaren is 4.37.

Wide Slim 100% 0 50 100
Compared with other similar sailboats it is slimmer than 100% of all other designs. It seems that the designer has chosen a significantly more speedy hull design. This type of design is also referred to as 'needle'.


Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Tumlaren is 51%.

Low High 92% 0 50 100
This ballast ratio shows a righting moment that is higher than 92% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly above average.


D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Tumlaren is 179 which categorizes this boat among 'light racers'.

Heavy Light 79% 0 50 100
79% of all similar sailboat designs are categorized as heavier. A light displacement requires less sailarea and has higher accellerations.


SA/D (Sail Area Displacement ratio)

What is SA/D (Sail Area Displacement ratio)?

The SA/D for Tumlaren with ISO 8666 reference sail is 14.4, with a 135% genua the SA/D is 16.0.

Low High 31% 0 50 100
The SA/D ratio indicates that it is faster than 31% of all similar sailboat designs in light wind.


Over- / underrigged

Low High 54% 0 50 100
The Tumlaren has more rig than 54% of all similar sailboats, which indicates that the boat is slightly overrigged.


RSP (Relative Speed Performance)

What is Relative Speed Performance?

The Relative Speed Performance for Tumlaren is 27

Slow Fast 27% 0 50 100
The relative speed performance is 27 which means that a it is faster than 27% of all similar sailboat designs.


Maintenance

Bottom Paint

When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 16m2 (172 ft2).
Based on this, your favourite maritime shop can tell you the quantity you need.

Note: If you use a paint roller you will need more paint than if you use a paintbrush.


Rig

Dimensions of sail for fractional rig.

mainsail specifications genoa specifications spinnaker specifications

Are your sails worn out? You might find your next sail here: Sails for Sale



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.



Guiding dimensions of running rig
UsageLengthDiameter
Mainsail halyard 25.1 m(82.2 feet)8 mm(5/16 inch)
Jib/genoa halyard25.1 m(82.2 feet)8 mm(5/16 inch)
Spinnaker halyard25.1 m(82.2 feet)8 mm(5/16 inch)
Jib sheet 8.3 m(27.2 feet)10 mm(3/8 inch)
Genoa sheet8.3 m(27.2 feet)10 mm(3/8 inch)
Mainsheet 20.8 m(68.1 feet)10 mm(3/8 inch)
Spinnaker sheet18.3 m(59.9 feet)10 mm(3/8 inch)
Cunningham3.1 m(10.1 feet)8 mm(5/16 inch)
Kickingstrap6.2 m(20.3 feet)8 mm(5/16 inch)
Clew-outhaul6.2 m(20.3 feet)8 mm(5/16 inch)

Boat owner's ideas

This section is reserved boat owner's modifications, improvements, etc. Here you might find (or contribute with) inspiration for your boat.

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



Finally

We are always looking for new photos. If you can contribute with photos for Tumlaren 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.



References