1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236 
"Artics" for Every Need
Page 111
If you've noticed an error in this article please click here to report it so we can fix it.
THE articulated vehicle lends itself to a wide variety of applications and Britain is able to supply a full range of models. One of the smallest outfits is a 35-cwt. machine for which a Trojan prime mover is employed, whilst vehicles of around 55-65-ton capacity are available. The biggest tractors include the Thornycroft Mighty Antar, the Rotinoff GR7 Atlantic and the Scammell Super Constructor.
Exact assessment of the payload capacity of a given prime mover is difficult because the number of variables involved maker. it necessary, particularly with he heavier outfits, to treat cases individually.
Apart from the unladen weight of the semi-trailer itself, factors which affect the carrying capacity of any prime mover are the load ratings of the rear axle or axles and their tyres, the construction of the semi-trailer, which determines the position of the centre of gravity of the load relative to its coupling, and the terrain over which the vehicle is to be operated.
In the succeeding paragraphs the various prime movers produced by different makers are classified according to their approximate pay load capacity. Details of the specifications of these different models will be found in the tables at the end of this issue.
Most of the four-wheeled prime movers are rated between 74 and 12 tons, but there are several with a much higher rating. Machines in the 74-8-ton class are made by Austin, Dodge, Foden, Morris and Thornycroft (Trident), whilst there are two
versions of the Scammell Scarab rated at 3 and 6 tons, and an E.R.F. 6-tonner.
In the 8-10-ton category there are tractors manufactured by A.E.C. (Mercury and Monarch), Albion, Atkinson, Austin, Vauxhall, E.R.F., Ford, Guy (Otter), Morris and Seddon. Examples of 10-12-tonners are the Commer, Dennis, E.R.F., Guy Warrior, Leyland Comet, Rowe Hillmaster and Rutland.
Other four-wheeled prime movers are the A.E.C. Mandator (16 tons), liRE 15-tonner, Foden 17and 30tonners, Guy Invincible (16 tons), Leyland Beaver (20-25 tons), Scammell 15-, 17-, 20and 25-tonners and the Mountaineer (30-35 tons), and the Thornycroft Trusty (15 tons).
Apart from the sixwheeled prime movers in
the 55-65-ton class already mentioned, there are the A.E.C. Mammoth Major Mk. 111 (25-30 tons), Atkinson 25-toriner, E.R.F. 16and 30-tonners, Foden 5055-tonner, Guy Invincible (20 tons), Leyland Super Hippo (30 tons), Scammell Constructor (40-45 tons) arid Thornycroft Big Ben (25 tons and 35-38 tons).