Review of Challenger 35 (Primrose)

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

The boat is equipped with 132.0 liter fresh water capacity.

The Challenger 35 (Primrose) 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.

Full keel

The Challenger 35 (Primrose) 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 most marinas as the draft is just about 1.52 - 1.62 meter (4.99 - 5.29 ft) dependent on the load. See immersion rate below.

Challenger 35 (Primrose) may be equipped with an inboard Volvo Penta 2003 diesel engine at 45 hp (33 kW). Calculated max speed is about 6.6 knots

The fuel tank has a capacity of 95.0 liters (25 US gallons, 20 imperial gallons).

What is Capsize Screening Formula (CSF)?

The capsize screening value for Challenger 35 (Primrose) is 1.70, indicating that this boat could - if evaluated by this formula alone - 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 6.8 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 Challenger 35 (Primrose) is about 170 kg/cm, alternatively 954 lbs/inch.
Meaning: if you load 170 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 954 lbs cargo on the boat it will sink 1 inch.

What is Motion Comfort Ratio (MCR)?

The Motion Comfort Ratio for Challenger 35 (Primrose) is 34.8.

What is L/B (Length Beam Ratio)?

The l/b ratio for Challenger 35 (Primrose) is 3.33.

What is a Ballast Ratio?

The ballast ratio for Challenger 35 (Primrose) is 34%.

What is Displacement Length Ratio?

The DL-ratio for Challenger 35 (Primrose) is 376 which categorizes this boat among 'heavy cruisers'.

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

The SA/D for Challenger 35 (Primrose) with ISO 8666 reference sail is 13.7, with a 135% genua the SA/D is 16.1.

When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 28m² (301 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.

Dimensions of sail for masthead rig.

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.

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

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