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Review of 50 C. B. Motorsailer


Basic specs.

sail specifications
The 50 C. B. Motorsailer is a large motorsailer designed by the American maritime architect Jay R. Benford.

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Interior
The boat is equipped with 6-8 berths.

Keel

The boat can enter even shallow marinas as the draft is just about 1.37 - 1.47 meter (4.49 - 4.79 ft) dependent on the load. See immersion rate below.


Engine

50 C. B. Motorsailer is typically equipped with an inboard diesel engine at 50.0 kW (67 hp).

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


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 50 C. B. Motorsailer is 1.72, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.


Immersion rate

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for 50 C. B. Motorsailer is about 559 kg/cm, alternatively 3133 lbs/inch.
Meaning: if you load 559 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 3133 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.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for 50 C. B. Motorsailer is 2.78.

Slim Wide 99% 0 50 100
Compared with other similar sailboats it is more spacy than 99% of all other designs. It seems that the designer has chosen a significantly more spacy hull design.


SA/D (Sail Area Displacement 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): 12.06


Maintenance

Rig

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
Jib sheet 15.2 m(50.0 feet)16 mm(5/8 inch)
Genoa sheet15.2 m(50.0 feet)16 mm(5/8 inch)
Mainsheet 38.1 m(125.0 feet)16 mm(5/8 inch)
Spinnaker sheet33.5 m(110.0 feet)16 mm(5/8 inch)

Boat owner's ideas

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

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Finally

We are always looking for new photos. If you can contribute with photos for 50 C. B. Motorsailer 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