I am a United States Sailor.

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SAILORS CREED
I am a United States Sailor. I will support
and defend the Constitution of the United States
of America and I W ill obey the orders of those
appointed over me. I represent the fighting
spirit of the Navy and those who have gone
before me to defend freedom and democracy around
the world. I proudly serve my countrys Navy
combat team with Honor, Courage, and
Commitment I am committed to excellence and fair
treatment of all.
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Lesson 4.2
Solid Weight Shifts, Additions and Removals
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Example of a SOLID weight addition gone wrong
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We must crawl before we can walk!

• Lets review Homework 1 and Lesson 4.1

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References(Are they different?)

• NSTM 079 Volume 1
• NTTP 3-20.31
• Damage Control Book, section II (a)

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Enabling Objectives to be covered

• Describe movement of reference points.
• Describe impact of addition, removal and shift
  of weight on stability.
• Calculate KG1 and GG2.
• Calculate Sine and Cosine corrections.
• Apply corrections to Static Stability Curve.

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CLASS TIMELINE
1. Vertical Weight Shifts2. Vertical Weight
Additions/Removals3. Sine Correction4.
Horizontal Weight Shifts5. Horiz Weight
Additions / Removals6. Cosine Correction7.
Example Problem
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Vertical Weight Shifts
GG1 KG1 - KGo
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KG1 (Wo x KGo) (w x kg)
Wf
WHEREw Weight Shifted
kg Distance Shifted
Wo Original Displacement
KGo Original Height of G
Wf Final Displacement
if shift up/- if shift down
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25 LT
Wo 2000 LT
12
45 LT
Wo 3400 LT
8 FT
33 FT
15.5 FT
17 LT
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WHEREw12 Weights Shifted
kg12 Distances Shifted
Wo Original Displacement
KGo Original Height of G
Wf Final Displacement
if shift up/- if shift down
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CLASS TOPICS
1. Vertical Weight Shifts2. Vertical Weight
Additions/Removals3. Sine Correction4.
Horizontal Weight Shifts5. Horizontal Weight
Additions/Removals6. Cosine Correction7.
Example Problem
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Example of vertical weight addition
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Vertical Weight Additions
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Vertical Weight Additions
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WHERE
KGo Original Height of G
Wo Original Displacement
if addition/- if removal
w Weight Added/Removed
kg Distance Keel to "g" of w
Wf Final Displacement
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16 LT
ADD
42 FT
Wo 2000 LT
KG1 ?
KGo 12 FT
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CLASS TOPICS
1. Vertical Weight Shifts2. Vertical Weight
Additions/Removals3. Sine Correction4.
Horizontal Weight Shifts5. Horizontal Weight
Additions/Removals6. Cosine Correction7.
Example Problem
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CL
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WHERE
OPP GT
HYP GG1
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THINK VERTICAL DIRECTION ONLY!!!

• SINE correction is vertical only I use KG1 to
  find SINE Correction

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GG1 0.8 FT
KG1 19.8 FT
Sin 0 0Sin 30 0.5Sin 90 1.0
GT0 .8FT x 0 0 FT
GT30 .8FT x .5 .4 FT
GT90 .8FT x 1 .8 FT
X
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CLASS TOPICS
1. Vertical Weight Shifts2. Vertical Weight
Additions/Removals3. Sine Correction4.
Horizontal Weight Shifts5. Horizontal Weight
Additions/Removals6. Cosine Correction7.
Example Problem
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Horizontal Weight Shifts
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WHEREw Weight Shifted
d Distance shifted
Wf Final Displacement
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Horizontal Weight Shifts
Wo 3000 LT
34 LT
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CLASS TOPICS
1. Vertical Weight Shifts2. Vertical Weight
Additions/Removals3. Sine Correction4.
Horizontal Weight Shifts5. Horizontal Weight
Additions/Removals6. Cosine Correction7.
Example Problem
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Horizontal Weight Additions and Removals
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WHEREw Weight Added or Removed
d Distance Added/Removed from Centerline
Wf Final Displacement
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Horizontal Weight Additions and Removals
50 LT
Wo 4500 LT
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CLASS TOPICS
1. Vertical Weight Shifts2. Vertical Weight
Additions/Removals3. Sine Correction4.
Horizontal Weight Shifts5. Horizontal Weight
Additions/Removals6. Cosine Correction7.
Example Problem
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Cosine Correction
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WHERE
ADJ GP
HYP GG2
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THINK TRANSVERSE DIRECTION ONLY!!!

• COSINE correction is transverse (Port/Stbd)
  only I use GG2 to find COSINE Correction

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KG1 19.0 FT
GG2 .9 FT
Cos 0 1.0Cos 60 0.5Cos 90 0
GP0 .9FT x 1 0.9 FT
GP60 .9FT x .5 .45 FT
GP90 .9FT x 0 0 FT
X
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Ok Lets see both corrections applied to the same
curve

• i.e. The BIG PICTURE

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Note Apply second correction to the first
corrected curve doesnt matter which one you do
first.
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CLASS TOPICS
1. Vertical Weight Shifts2. Vertical Weight
Additions/Removals3. Sine Correction4.
Horizontal Weight Shifts5. Horizontal Weight
Additions/Removals6. Cosine Correction7.
Example Problem
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EXAMPLE PROBLEM
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V 67 LT 43 FT3/LT
V 2881 FT3
wH2O 2881 FT3 / 35 FT3/LT
wH2O 82.31 LT
wadded 82.31 LT 67 LT 15.31 LT
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2
HELICOPTER
C/L
11
32
0
352
BOAT
P
- 3
54
31
162
93
AMMO
P?S
13
25
27
325
351
TANK
S
2881
15.31
9
10
137.79
153.1
23.31
814.79
162
597.1
0
23.31
652.79
597.1 STBD
1
3
3650
3673.31
19.62
652.79
0.62
19.2
19.26
597.1
0.36
0.16
0.36
19.0
This is what you plot
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Review of Enabling Objectives

• Describe movement of reference points.
• Describe impact of addition, removal and shift
  of weight on stability.
• Calculate KG1 and GG2.
• Calculate Sine and Cosine corrections.
• Apply corrections to Static Stability Curve.

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Quiz

• If we have a weight addition (w) the notation in
  the KG1 equation is?
• ANS
• What are the SINE values for 0?, 30? and 90?
  degrees?
• ANS 0? 0, 30? 0.5, 90? 1
• What are the COSINE values for 0?, 60? and 90?
  degrees?
• ANS 0? 1, 60? 0.5, 90? 0

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Instructor will now

• Assign Homework for lesson 4.2 (Stability
  Problems 1, 2, 3)
• Read Student Guide!!