GMT 050 - Page 23

GMT 050 User manual
23
To support the operator in determining if the diameter of the tree or branch to cut is not larger than
Ø50 cm [Ø19,7”] the following rule can be used:
“When the claws of the grapple are placed around the
tree or branch and the claws are fully enclosing the
wood the diameter is smaller than Ø50cm [Ø19,7”].”
Length of wood
at ≈ 500 kg (1102 lb)
Type of tree
with foliage
(50% red.)
Ø 19,7"
[Ø 50cm]
[m]
[ft]
Pine
2
6
Spruce
2
7
Larch
2
5
Willow
1
5
Birch
1
5
Beech
1
5
Ash
1
5
Alder
2
6
Oak
1
4
Poplar
2
7
Attention! The values in the table are indications only. The load charts of the crane and carrying
vehicle as well as the maximum allowed length of the hanging load are at all times decisive.
Lifting reference table
1)
Lifting reference (Metric system)
Length for 500 kg stem
Length for 1000 kg stem
Type of
tree
Average
density of
1 m3 fresh
green wood
Weight
stem Ø
19,7"
[Ø 50cm]
tree without
foliage
Ø 19,7" [Ø
50cm]
with
foliage(50%
red.)
Ø 19,7" [Ø
50cm]
tree without
foliage
Ø 19,7" [Ø
50cm]
with
foliage(50%
red.)
Ø 19,7" [Ø
50cm]
[kg/m
3
]
[kg/m]
[m]
[m]
[m]
[m]
Pine
673
132
4
2
8
4
Spruce
625
123
4
2
8
4
Larch
769
151
3
2
7
3
Willow
865
170
3
1
6
3
Birch
913
179
3
1
6
3
Beech
865
170
3
1
6
3
Ash
849
167
3
1
6
3
Alder
721
142
4
2
7
4
Oak
1009
198
3
1
5
3
Poplar
609
120
4
2
8
4
1)
Cited: Moisture Content and Weight. [online] Available at: https://www.engineeringtoolbox.com/weigt-wood-d_821.html [Accessed 25 Apr 2019]