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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 1
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
Robert S. Kaidy Naval Architect & CEO
360 NW ALICE AVE., STUART, FL 34994
O: 772-692-8551 E: [email protected]
www.ocean5inc.com
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 2
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
Presentation Goals
Introduce New & Innovative Hull Forms
Identify Strengths and Weaknesses of Each Type
Define Major Design and Build Issues for Each Type
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 3
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
TABLE OF CONTENTS
1) Introduction
2) Special Bow Types
a) Axe Bow
b) X Bow
c) Very Slender Vessel
3) Trimarans / Wave Piercing Cats
4) Conclusions
A-1 References
Note that Axe Bow, X-Bow, Very Slender Vessel
and other terms used in this paper, are and may
be trademarked and owned by others. This is an
academic paper, and not meant to advertise,
usurpe or otherwise infringe on the intellectual
property rights of the respective owners. Refer to
the owners of such rights for more information
regarding licensing or other usage.
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 4
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
1.0 INTRODUCTION
Whats Old is New Again
Solving Old Problems.Seakeeping
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 5
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
1.0 INTRODUCTION
With Old and New Solutions &
Applications
New Ways of Looking at Old
Problems
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 6
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
1.0 INTRODUCTION
Concepts
Fundamental Concept :
Reduce Seakeeping Accelerations
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 7
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
1.0 INTRODUCTION
Concepts
Fundamental Concept :
Added Power in Waves
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 8
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
2.0 Special Bow Types
ULSTEIN
DAMEN
2.1 General Description
2.2 Example Vessels
2.3 Pro/Con
2.4 Limits
2.5 Design & Build Issues
Overview.
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 9
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
2.1 Special Bow Types - General
Type: Fast Displacement Monohull & Planing Hull Forms
Speed: 25 50 knots Typical
Description: Small Waterplane Area Bow Sections achieved using:
Extremely Narrow Beam, Extremely High Deadrise Forward Sections
Above and Below Waterline. May also include Patented Hogged Keel Shape.
May include plumb stem, or aft raking stem May include unique topsides/deck shapes
Trade Names / Alias: Axe Bow (Damen) X-Bow (Ulstein) Wave Piercing Hull Slender Vessel
ULSTEIN
DAMEN
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 10
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
2.1 Special Bow Types - General
Description Three Main Varieties : Patented Axe Bow Damen
Extended Bow Portion Extreme Narrow Beam Extreme Deadrise Plumb Bow Stem Hogged Keel
X-Bow Type Ulstein Extreme Narrow Bow Below Waterline Narrow Waterplane Reverse Stem Minimal Flare at Bow Sagged Keel Rounded Topsides
Slender Vessel USMI & Others Extreme Narrow Beam Bow Long/Extended Bow Portion No Flare / Round Topsides Conventional Prismatic Stern for Planing
ULSTEIN
DAMEN
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 11
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
2.1 Special Bow Types - General
Description Three Main Varieties : Patented Axe Bow Damen
Extended Bow Portion Extreme Narrow Beam Extreme Deadrise Plumb Bow Stem Hogged Keel
DAMEN
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 12
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
2.1 Special Bow Types - General
Axe Bow
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 13
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
2.2 Special Bow Types Example Vessels
Sea Axe Type Feadship SY M/Y PREDATOR
DAMEN Fn = 2.3
Fn = 1.8
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 14
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
2.1 Special Bow Types - General
Description Three Main Varieties : X-Bow Type Ulstein
Extreme Narrow Bow Below Waterline Narrow Waterplane Reverse Stem Minimal Flare at Bow Sagged Keel Rounded Topsides Conventional Hull Bottom
Fn = 0.82
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 15
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
2.1 Special Bow Types - General
X-Bow
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 16
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
2.1 Special Bow Types - General
X-Bow
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 17
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
2.1 Special Bow Types - General
X-Bow
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 18
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
2.2 Special Bow Types Example Vessels
Blohm & Voss 118M M/Y SIGMA, Philip Starck Design
Fn = 1.16
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 19
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
2.1 Special Bow Types - General
Description Three Main Varieties : Slender Vessel US Marine
Extreme Narrow Beam Bow Long/Extended Bow Portion No Flare / Rounded Topsides Conventional Prismatic Stern for Planing
Fn = 7.2
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 20
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
2.1 Special Bow Types - General
Very Slender Vessel:
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 21
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
2.2 Special Bow Types Example Vessels
Fn = 5.00
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 22
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
2.3 Special Bow Types Pros and Cons
Advantages Challenges
Improved Seakeeping Reduced Interior Volume (or 20% more length
for equiv. volume)
Reduced Vertical Accelerations in
Seaway (Aft Accommodations) Bow Anchor Handling Difficult or Impossible
Reduced Slamming Bow Line Handling Difficult or Impossible
Reduced Resistance in Seaway Potential Directionally Unstable without Control
Systems / Broaching
Proprietary (some) / Licensed Proprietary (some) / Patented
Weather Deck Wetting
Impaired Helm Visibility
Displacement Sensitive
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 23
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
2.3 Special Bow Types Pros and Cons
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 24
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
2.3 Special Bow Types Pros and Cons
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 25
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
2.4 Special Bow Types - Limits
Special Bow Types Requires Substantial Additional Length for Same Hull Volume to
Achieve Advantage
High Speeds exacerbate Control Issues
Bow Operations Difficult
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 26
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
2.5 Special Bow Types Design and Build Issues
Design Issues: Extended Length
Reduced Beam
Roll Stability / Period
Arrangements
Aesthetics
Proprietary/Patents
Directional Control
Helm Visibility
Build Issues: Extremely Narrow Bow Sections
Access for Welding
Access for Inspection
Rigging Routing
Special Bow Types Simplified Shapes
X Bow Much more complex Shapes
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 27
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
3.0 Trimarans
3.1 General Description
3.2 Example Vessels
3.3 Pro/Con
3.4 Limits
3.5 Design & Build Issues
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 28
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
3.1 Trimarans - General
Type: High Length to Beam Ratio
Main Hull
Small Outrigger Hulls
Speed: 5 40 knots Typical, 1-4 Fn
Description: Small Waterplane
Area Center
Hull
Outrigger Hulls Provide
Roll Stiffness
May include plumb stem, or
aft raking stem
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 29
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
3.2 Trimarans Example Vessels
Fn = 2.0+
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 30
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
3.2 Trimarans Example Vessels
Fn = 3.38
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 31
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
3.2 Trimarans Example Vessels
Fn = 1.96
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 32
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
3.2 Trimarans Example Vessels
Fn
2.68
2.44
1.96
1.92
1.74
1.37
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 33
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
3.3 Trimarans Pros and Cons
Advantages Challenges
Improved Seakeeping Reduced Interior Volume
Reduced Vertical Accelerations in Seaway (Aft
Accommodations) Bow Anchor Handling Difficult or Impossible
Reduced Slamming Bow Line Handling Difficult or Impossible
Reduced Resistance in Seaway Directionally Unstable without Control Systems
Proprietary (some) / Licensed Proprietary (some) / Patented
Weather Deck Wetting
Impaired Helm Visibility
Displacement Sensitive
Cross Beam Slamming / Tunnel Top Slamming
Weight / LCG Sensitive
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 34
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
3.4 Trimarans Design and Build Issues
Design Issues Build Issues
Weight Sensitive Extremely Narrow
Forebody
Structure Critical Weight Critical
Sponsons Highly Loaded
/ Cross Beams
Cross Beam
Fabrication/Structural
Continuity
Narrow Hulls in Way of
Arrangements
Deck Operations
Visibility and Height
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 35
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
4.0 CONCLUSIONS
New Hull Forms Focused on Improved Seakeeping.
Three General Types of Bow Form Innovations.
Several Bow Forms proprietary.
Bow Forms appear to reduce accelerations in some seastates
Bow Forms appear to reduce resistance in some seastates
Trimarans reduce accelerations in seaway and reduce resistance in seaway
Interior volume of new hull forms significantly reduced
Construction Complexity and cost increased
Visibility can be significantly reduced in seaway
Bow Main Deck Operations limited
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IBEX 2013 SESSION 102 Advanced Trends in Powerboat Hull Design
Page 36
Robert Kaidy - Naval Architect
OCEAN5 NAVAL ARCHITECTS
Appendix A-1 REFERENCE
1. SNAME, TR No. R-42, SEAKEEPING OF HARD CHINE PLANING HULLS, SAVITSKY &
KOELBEL, JUNE 1993
2. MARINE TECHNOLOGY, VOL. 13 NO. 4, PROCEDURES FOR HYDRODYNAMIC
EVALUATION OF PLANING HULLS IN SMOOTH AND ROUGH WATER, SAVITSKY &
BROWN, OCT 1976, PP. 381-400
3. 19TH INTERNATIONAL HISWA SYMPOSIUM ON YACHT DESIGN AND YACHT
CONSTRUCTION, THE AXE BOW: THE SHAPE OF SHIPS TO COME, GELLING, 13 & 14
NOVEMBER 2006, AMSTERDAM
4.
5.
6.
7.