Review of Motiva 50 Dobbeltender

The deck is made of steel.

The interior is like most other boats made of teak. Teak has the advantage of being naturally very oily and therefore water-repellent, which is suitable on boats.
The boat is equipped with 0 cabins, 8-12 berths, a galley, 1600.0 liter fresh water capacity, toilet facility and 360.0 liter waste water capacity.

Note: the boat has also been sold to be self-made/-interiored, which means that the quality of each boat may vary.

The Motiva 50 Dobbeltender is equipped with a ketch rig. A ketch rig is generally considered easier to handle, because the sails are smaller, and because it can sail on most points to the wind with one sail completely taken down for repair or while reefing. The sail configuration of a ketch allows for better comfort and stability when sailing downwind or on a broad reach.

Fin keel

The Motiva 50 Dobbeltender is equipped with a fin keel. A boat with a fin keel is more manoeuvrable but has less directional stability than a similar boat with a full keel.

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.

Motiva 50 Dobbeltender can only enter major marinas as the draft is about 2.35 - 2.45 meter (7.71 - 8.01 ft) dependent on the load. See immersion rate below.

The boat may be equipped with an inboard Ford engine at 130 hp (96 kW). The speed is 10.0 knots.

The transmission is a shaft drive. A shaft drive will in the long run require less maintenance than other types of drive e.g. a sail drive.

The fuel tank has a capacity of 1500.0 liters (396 US gallons, 329 imperial gallons).

What is Capsize Screening Formula (CSF)?

The capsize screening value for Motiva 50 Dobbeltender is 1.63, 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 8.9 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 Motiva 50 Dobbeltender is about 392 kg/cm, alternatively 2195 lbs/inch.
Meaning: if you load 392 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 2195 lbs cargo on the boat it will sink 1 inch.

What is Motion Comfort Ratio (MCR)?

The Motion Comfort Ratio for Motiva 50 Dobbeltender is 42.4.

What is L/B (Length Beam Ratio)?

The l/b ratio for Motiva 50 Dobbeltender is 3.47.

What is a Ballast Ratio?

The ballast ratio for Motiva 50 Dobbeltender is 35%.

What is Displacement Length Ratio?

The DL-ratio for Motiva 50 Dobbeltender is 236 which categorizes this boat among 'light crusers & offshore racers'.

When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 67m² (721 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.

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.

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

We are always looking for new photos. If you can contribute with photos for Motiva 50 Dobbeltender 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.