# Seamanship: Ship or Vessel Displacement Problems and Solving regarding Draft and its Beam (Breadth)

A vessel of

**650 feet in length,**

**displace 9,000 tons** and her

**block coefficient is .7**

If her **forward draft is 14 feet and 06 inches, **

and its** aft draft is 18 feet and 06 inches,**

find her beam (breadth)

if she is floating in fresh water.

**So the formula that we will use since she is floating in fresh water is:**

B = displacement x 36 / L x D x C

A vessel of

**650 feet in length,**

**displace 9,000 tons** and her

**block coefficient is .7**

If her **forward draft is 14 feet and 06 inches, **

and its** aft draft is 18 feet and 06 inches,**

find her beam (breadth)

if she is floating in fresh water.

**So the formula that we will use since she is floating in fresh water is:**

B = displacement x 36 / L x D x C

But main draft is not yet given, only forward draft and aft draft; so we have to solve first the main draft before we proceed to solve for her breadth (beam) as it may look like this:

B = displacement x 36 / L x ? x C

**And the formula to solve the main draft of the ship is:**

MD = FD + AD / 2

**Legend:**

**MD** stands for Main Draft of the ship

**FD** stands for Forward Draft of the ship

**AD** stands for After Draft of the ship

**+ **symbolizes addition or plus sign

**/ **symbolizes divided by

**2** is a constant in main draft (drop) formula solving

**So here are the calculations:**

MD = FD + AD / 2

MD = 14’06” + 18’06” / 2

MD = 32’12” / 2

MD = 33’ / 2

MD = **16.5 feet**

Therefore, ships **mean draft is equals to 16.5 feet**

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Or click the link to read another displacement problem solving regarding measuring capacity in cubic foot and length
http://expertscolumn.com/content/seamanship-ship-or-vessel-displacement-problems-and-solving-regarding-mesured-capacity-cubic

**Then let’s proceed to solve the ships beam (breadth) and since she is floating in fresh water, here are the solving:**

B = Displacement x 36 / L x D x C

B = 9,000 tons x 36 / L x D x C

B = 324,000 / L x D x C

B = 324,000 / 650 x 16.5 x .7

B = 324,000 / 10,725 x .7

B = 324,000 / 7,507.5

B = 43.1568431568

B = **43.16**

**Ship’s beam (breadth) 43.16 feet** is now solved, floating in fresh water.