N 0'\ 0
Table
15.1
Logboats
from
Southern
Britain
dated
AD
600
or
earlier
Logboat
Date
range
Region
Sized
Be
cal.
(m)
Appleby
1525-
120
5
Humber!
Ancholme
>7.5
x
1.35
Short
Ferry
12
55-
80
5
Wash/Witham
>7.3
x
0.85
Brigg
I
1245-800
Humber!
Ancholme
14.78
x
1.37
x
I
Peterborough
875-53
0
Wash/Nene
>9.8
x
0.78
Hasholme
a
750-39
0
Humber!Foulness
12.78
x
1.4
x
1.25
Ellesmere
46
5-
200
Severn/Parry
3.35
x
0·73
x
0·44
Clifton
I
450-
195
HumberlTrent
8.55
x
0.76
x
0.36
Clifton
2
41
5-95
HumberlTrent
9.25
x
0.76
x
0.38
Poole
(^14)
0-
19
0
Poole
Harbour
10.01
x
1.52
x
0.5
Holme
Pierrepont
I
41
0-
135
Humber!Trent
>6,5
x
0.86
Holme
Pierrepont
2 b
Humber/Trent
>5.3
x
0.82
Holme
Pierrepont
3 b
Humber/Trent
>10.0
x
1.28
Shapwick
c
795-
80
Brue
>6
x
0.75
Glastonbury
I
340-3
0
Brue
5.4
x
0.69
x
0.42
Woolwich
205-105
AD
Thames
>4·75
x
0·55
Baddiley
Mere
100-110
AD
MerseylWeaver
5.49
x
0.92
x
0.61
Wisley
II0-345
AD
Thames/Wey
>3.66
x
0.7
Notes a
Dated
by
dendrochronology
(Sheffield)
to
322-277
Be
(Millett
and
McGrail
1987:
79-84).
Undated
but
considered
contemporary
with
HPI.
Deadweight
e
coefficient 0.67 0·57 0.67 0·43 0·47 0·57 0.60 0.66
Volumetric! coefficient
(x
10
3 )
1.54 3.
00
11.3 1.9 1.7 1.94 4.
6
14.
8
c
The
one
date
for
this
boat
(Q-357)
has
a high
uncertainty
(±120),
hence
the
large
date
range.
It
is possible
that
this
boat
has
a similar
date
to
Glastonbury
I.
d
Sizes
are
given
as
length
x max.
breadth
x max.
height
of
hull,
for
those
boats
which
have
been
theoretically
reconstructed.
For
the
others,
with
less
remains,
a minimum
length
and
breadth
are
given.
e
Deadweight
coefficient
=
weight
of
crew
and
cargo/displacement
at
standard
draft
(60%
height
of
sides).
The
greater
this
coefficient,
the
better
the
boat
is
for
carrying
high
density
loads
(McGrail
197
8 : 137).
Volumetric
coefficient
=
displacement/cube
of
waterline
length
(when
carrying
maximum
crew
and
no
cargo).
A
value
""'2
X
10-
3 indicates
a hull
of
potentially
high
speed.
Sources
Dates:
Switsur,
R.V.
(1990)
Results
of
Boat
Dating
Programme,
Cambridge
(unpublished).
The
dates
have
been
calibrated
using
the
curves
published
by
Pearson
and
Stuiver
(1986).
The
felling
dates
of
the
parent
logs
of
these
boats
(close
to
the
building
date)
could
be
an
estimated
25
to
70
years
later
than
the
calibrated
dates
given
above.
Other
data:
McGrail,
S.
(1978)
Logboats
of
England
and
Wales,
Oxford:
British
Archaeological
Reports
p.