Healy Icebreaking Performance

1
Healy Icebreaking Performance

• Davis Strait Baffin Bay
• April-May 2000

2
Icebreaking Performance

• Design Requirements
• Transit 4.5 ft, 100 psi ice at 3 kt
• Penetrate 8 ft ice by backing and ramming

3
Required Tests from Test Memos
4
Healy Data Collection Equipment supplied by CDNSWC
5
(No Transcript)
6
Test Sites
7
Continuous Icebreaking in Level Ice
8
(No Transcript)
9
Thrust from Both Systems
10
Ice Characterization

• Ice Thickness
• Drilling
• Electromagnetic Induction
• Snow Depth
• Density
• Ice Flexural Strength
• Derive from ice core properties

11
(No Transcript)
12
(No Transcript)
13
(No Transcript)
14
Start-Up and Bow Wash Tests
15
Turning Radius Tests
16
Turning Radius Test Ice thickness 90 cm Turning
diameter 1538 m
17
Radar Image of Turning Radius Tests D 1500h
18
Backing and Ramming Multiyear Ice
19
Multi-Year Ice
Ship position vs. Time
Ship speed vs. Position
20
Summary Penetration Distance 350 m Ice thickness
Mean 3.3m Range 1.8 to gt7 m 18 rams, Approx. 1 hr.
21
Backing and Ramming First-Year Ridge
22
(No Transcript)
23
Speed and Position vs. Time
Ship Speed vs. Position
First Year Ridge Summary Mean thickness 5.4 m
Max thickness 15 m 3 Ram cycles, 15 minutes
24
(No Transcript)
25
Trial Summary

• Healy broke 4.5 ft level ice at 4.7 to 5.5 kts
• 5.7 ft of ice at 2 kts
• Scale 50 psi ice to 100 psi
• 4.5 ft ice at 3.3 to 3.9 kts
• Backed and rammed multiyear ice (100 psi)
• Mean thickness 11 ft
• Transited pressure ridges
• 77 Individual tests

26
Other Tests

• Hull Loads
• Forward shoulder, transom, rudder
• Propulsion Machinery
• Mechanical, electrical
• Trafficability

27
Finding Test Sites

• Pre-trip planning
• NIC and CIS Ice Specialists
• TeraScan and CIS IceVu
• AVHRR, DMSP-OLS, RadarSat
• Helicopter Reconnaissance

28
NIC and CIS Ice Analyses
29
IceVu and TeraScan
30
DMSP and RADARSAT
31
(No Transcript)
32
(No Transcript)
33
(No Transcript)
34
Helo Recon Flights
35
(No Transcript)
36
(No Transcript)
37
(No Transcript)