Download presentation

Presentation is loading. Please wait.

Published byLiberty Stith Modified over 2 years ago

1
Lesson 4.8 Righting Ship CL d X PENDULUM LENGTH - 10 TO 25 FT

2
Class Topics 1. Definitions 2. Moment to Heel or List 1 o 3. Example Problems 4. Inclining Experiment 5. Righting Ship Drill

3
DEFINITIONS ROLL - The action of a vessel involving a recurrent motion. HEEL - Semi-permanent angle of inclination, caused by external forces. LIST - Permanent angle of inclination caused by a shift in the center of gravity so as to cause G off CL, a -GM, or a combination of the two.

4
Class Topics 1. Definitions 2. Moment to Heel or List 1 o 3. Example Problems 4. Inclining Experiment 5. Righting Ship Drill

5
A ship will heel or list until the Rigting Moment is equal to the Inclining Moment IM = RM The inclining moment is a force (w) multiplied by some distance (d) IM = w x d

6
CL w

7
w w

8
w w d IM = w x d

9
d w w X

10
d w w X

11
X To find the distance X: Cos = adjacent or X hypotenuse d Thus X = d x cos IM = w x d IM = w x d x cos d

12
IM = RM A Righting Moment is the moment that a ship creates to keep itself upright. It is also equal to a weight (W f ) multiplied by some distance (GZ) RM = GZ x W f From Lesson 4.01: GZ = GM x sin Therefore: RM = GM x W f x sin

13
IM = w x d x cos RM = GM x W f x sin w x d x cos = GM x W f x sin w x d = GM x W f x tan (tan 1 o = 0.01746) MH1 o = GM x W f x 0.01746 IM = RM

14
IM = w x d x cos RM = GM x W f x sin w x d x cos = GM x W f x sin w x d = GM x W f x tan (tan 1 o = 0.01746) MH1 o = GM x W f x 0.01746 IM = RM

15
MH1 o = GM x W f x 0.01746 List = w x d MH1 o

16
Class Topics 1. Definitions 2. Moment to Heel or List 1 o 3. Example Problems 4. Inclining Experiment 5. Righting Ship Drill

17
INCLINING EXPERIMENT Completed upon commissioning, and following each major overhaul or shipalt. It is done to verify the exact location of the ship's center of gravity (KG). Basis for updates to Section II(a) of the DC book and for changes to weight and moment compensation status

18
WHO GETS INVOLVED? 1. DCA 2. NAVSEA/HQ 3. F/O AND WATER KING 4. YARD NAVAL ARCHITECT 5. SUPSHIP/NESU 6. RIGGERS 7. CHENG 8. EVERYONE ELSE IS OFF SHIP

19
PROCEDURE 1. REMOVE ALL OBJECTS 2. EMPTY ALL TANKS 3. VERIFY LOAD-OUTS 4. PLACE WEIGHTS ON CL 5. MEASURE FREEBOARD 6. TAKE PHOTO OF DRAFTS 7. TAKE H 2 O SAMPLE 8. RIG PENDULUMS (3 MIN) 9. MOVE WTS OFF-CL EXACT DIST 10. RECORD INCLINATION

20
INACCURACIES 1. UNACCOUNTED FOR FSE 2. MOVEMENT OF PERSONNEL 3. INACCURATE WEIGHTS 4. TAUGHT LINES 5. POOR WEIGHT VERIFICATION WALK THROUGH

21
Class Topics 1. Definitions 2. Moment to Heel or List 1 o 3. Example Problems 4. Inclining Experiment 5. Righting Ship Drill

22
MOB-D-6-SF Righting Ship Conducted: Semi-Annually Purpose: To train the damage control organization in correcting a list. Requirements: Condition 1 and zebra set. Liquid loading may be varied to put an actual list or trim on the ship if desired.

23
Drill Conditions: One or more compartments have been flooded or are open to the sea. Flooding boundaries are established; flooding is under control. Emergency patching, plugging, or shoring have been completed. Correction of the ship’s list has been ordered. Evaluation: As per FXP-4

Similar presentations

Presentation is loading. Please wait....

OK

SAILOR’S CREED “ I am a United States Sailor.

SAILOR’S CREED “ I am a United States Sailor.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on boston consulting group Ppt on j&k tourism Ppt on information and communication technology Ppt on japanese business culture Ppt on cartesian product symbol Slides for ppt on internet Ppt on acid-base titration equation Ppt on 7 wonders of india Slideshare ppt on internet Ppt on bluetooth communication devices