| |
BOOKS |
|
| |
|
M
A
R
I
N
E
S
U
R
V
E
Y
B
U
S
I
N
E
S
S |
|
|
|
|
B
O
A
T
B
U
Y
E
R
S
G
U
I
D
E
|
|
|
| |
by
David Pascoe |
|
|
| Related
Article
Surveying Wood Hulls:
Part I
- Materials and Causes of Problems
Photos by David H.
Pascoe, Marine Surveyor
|
|
The effects of stray current
are usually unmistakable.
This is the remnant of a zinc anode attached
to a bonding system that was subjected to a full
twelve volts, leaving an obvious burn pattern. The
zinc did its job and the problem was caught in time
before serious damage occurred. |
 |
Corrosion of stainless bolts
by crevice corrosion or acid attack. The prominent
feature is that the active corrosion areas are bright
metal. |
 |
This is erosion corrosion
on a rudder blade caused by propeller wash. It is
often mistaken for electrolysis. |
|  |
Hogging, a condition in which
a hull is actually sagging with age, is an accurate
indicator that a wood hull has reached the point
of severe structural degradation and can no longer
be considered safe. This condition is plainly evident
on the above yacht. |
Go to Article
First posted 5/25/97 at David Pascoe's site www.yachtsurvey.com.
|
|
|
|
