Changing the way you learn

Design

Features of hull designs
1. Hard Chine
  1. provides internal space
  2. less wet area
  3. expensive to fabricate
2. Catamaran
  1. stable
  2. comfortable ride
  3. house boats, sail boats
  4. 2 hulls
3. Trimaran
  1. stable
  2. soft ride
  3. good turning characteristics
4. Hydrofoil
  1. light
  2. high power required
  3. wing like
    1. mounted on struts below hull
      1. lifts boat out of water
  4. Skiis
5. SWATH
  1. Small water plane area twin hull
  2. Tendancies of instablility
  3. big space underneath
6. Wave piercer
  1. reduced buoyancy in forward positions
    1. when wave is encounted
      1. 'pierces' wave rather then over the top
  2. smooth ride
  3. passenger ferries
Variation in design for specific use
1. Commercial fishing boats
  1. 'Trawlers'
    1. tow trawl
      1. catch shrimp
  2. Seiners
    1. surrounding nets
      1. catch tuna
  3. line
    1. long line W baited hook
      1. Tuna
2. Dive Boats
  1. stable
  2. lots of space
    1. tank space
  3. wet areas
  4. catamaran
  5. Day dive boat
  6. OVer night dive boat
3. Yachts
  1. Leisure purpose
  2. Day sailing yacht
    1. ~6 meters long
    2. no cabin
  3. Weekenders
    1. 9.5 meters
    2. can operate in shallow waters
    3. 2-3 day journeys
    4. simple cabin
      1. 2-4 people
    5. limited space
  4. Cruising
    1. 7-14 meters
    2. single masted
    3. speed = 6 knots
    4. capable of 1000's miles at a time
4. Rigid inflatable boats
  1. light weight
  2. stable
  3. inflatable collar = buoyancy
  4. Used to transfer troops
Displacement
1. ploughs through water
2. displaces a weight equal to its own
3. speed limitedto hull speed
4. uses keel or ballast for stability
5. handles seas well on bow
Planning
1. boat rise slightly out of water
2. gliding rather than ploughing
3. limited length due to power required
4. slow to handle rough seas
5. stern low and therefore vulnerable to waves
6. flat bottom toward stern
7. requires high power
hard chine vs soft chine
1. hard
  1. provides more internals space
  2. less wetted area
2. soft
  1. gives a faster ride in rough weather

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	Created by Keah about 11 years ago