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Review of Rasmus 35


Rasmus 35
Rasmus 35 anno 1974. Bådnavn PLI


Basic specs.

sail specifications
The Rasmus 35 aka NAB 35 is a motorsailer designed by the Swedish maritime architect Olle Enderlein in the late sixties. Several hundred boats have been produced. The Rasmus 35 is built by the Swedish yard Hallberg-Rassy Varvs AB.

Looking for a new boat? Find a Rasmus 35 or similar boat for sale

Hull

The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season.


Interior

The interior is like many other boats made of mahogany. Mahogany belongs to the hardwood species, known for being water-repellent and resistant to decay. It has an attractive wood grain and holds wood polish and varnish well.
The boat is equipped with 3 cabins, 6 berths, a galley and 240.0 liter fresh water capacity.


Rig
Rig
Rig of Rasmus 35.

The Rasmus 35 is equipped with a masthead rig. The advantage of a masthead rig is its simplicity and the fact that a given sail area - compared with a fractional rig - can be carried lower and thus with less heeling moment.


Keel

Full keel

The Rasmus 35 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 iron. Many people prefer lead keel in favour of iron. The main argument is that lead is much heavier than iron and a lead keel can therefore be made smaller which again result in less wet surface, i.e. less drag. In fact iron is quite heavy, just 30% less heavy than lead, so the advantage of a lead keel is often overstated.

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.


Engine

The Rasmus 35 has been equipped with different engine alternatives.

Alternative 1:

Rasmus 35 may be equipped with an inboard Yanmar diesel engine

Alternative 2:

The boat may be equipped with an inboard Volvo Penta MD21A diesel engine at 75 hp (55 kW). Calculated max speed is about 9.5 knots

The fuel tank has a capacity of 240.0 liters (63 US gallons, 52 imperial gallons).


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 Rasmus 35 is 1.71, 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 7.0 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 Rasmus 35 is about 171 kg/cm, alternatively 961 lbs/inch.
Meaning: if you load 171 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 961 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 Rasmus 35 is 30.8.

Low High 76% 0 50 100
Comparing this ratio with similar sailboats show that it is more comfortable than 76% of all similar sailboat designs. This is a comfort value significantly above average.


L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Rasmus 35 is 3.44.

Wide Slim 73% 0 50 100
Compared with other similar sailboats it is slimmer than 73% of all other designs. It seems that the designer has chosen a slightly more speedy hull design.


Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Rasmus 35 is 43%.

Low High 66% 0 50 100
This ballast ratio shows a righting moment that is higher than 66% of all similar sailboat designs. A righting moment (ability to resist heeling) just above average.


D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Rasmus 35 is 272 which categorizes this boat among 'light crusers & offshore racers'.

Heavy Light 42% 0 50 100
42% 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.


SA/D (Sail Area Displacement ratio)

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

The SA/D for Rasmus 35 with ISO 8666 reference sail is 13.5, with a 135% genua the SA/D is 15.8.

Low High 12% 0 50 100
The SA/D ratio indicates that it is faster than 12% of all similar sailboat designs in light wind.
Don't panic! It is expected that motor sailers has a low SA/D value as this is the natural consequence of the design combining sailing and motor boat characteristics.


Over- / underrigged

Low High 58% 0 50 100
The Rasmus 35 has more rig than 58% 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 Rasmus 35 is 1

Slow Fast 1% 0 50 100
The relative speed performance is 1 which means that a it is faster than 1% of all similar sailboat designs. As this boat is a motor sailer, it is expected that the performance of a motor sailer for sail alone is lower than a dedicated sailboat.


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 27m2 (290 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 masthead 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 26.8 m(87.9 feet)10 mm(3/8 inch)
Jib/genoa halyard26.8 m(87.9 feet)10 mm(3/8 inch)
Spinnaker halyard26.8 m(87.9 feet)10 mm(3/8 inch)
Jib sheet 10.5 m(34.4 feet)12 mm(1/2 inch)
Genoa sheet10.5 m(34.4 feet)12 mm(1/2 inch)
Mainsheet 26.2 m(86.1 feet)12 mm(1/2 inch)
Spinnaker sheet23.1 m(75.8 feet)12 mm(1/2 inch)
Cunningham4.2 m(13.8 feet)10 mm(3/8 inch)
Kickingstrap8.4 m(27.6 feet)10 mm(3/8 inch)
Clew-outhaul8.4 m(27.6 feet)10 mm(3/8 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 Rasmus 35 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