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Torque required to twist and cut loose Scots pine stumps

Berg, Simon and Bergström, Dan and Athanassiadis, Dimitris and Nordfjell, Tomas (2012). Torque required to twist and cut loose Scots pine stumps. Scandinavian journal of forest research. 27 :8 , 724-733
[Research article]

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Official URL: http://dx.doi.org/10.1080/02827581.2012.721002


Stump wood is a possible source of renewable energy, but before its potential as a fuel can be utilised to a high degree, new harvesting techniques should be developed to reduce the environmental impact (notably ground disturbance) of harvesting stumps. The forces required to lift and drag stumps out of the soil are known. In this study, two unknown and important parameters were addressed: the torque required to uproot stumps by twisting them and the torque required to cut lateral roots around stumps. A new, improved stump-twisting rig was designed and used in trials with 28 Scots pine (Pinus sylvestris) trees (breast-height diameter over bark, 153–427 mm). The measured torque requirements ranged from 10 to 50 kNm. Twisting stumps required more torque than cutting lateral roots around stumps and the required torque increased with increases in stump size. The results indicate that a wrist on a big feller-buncher, but not a conventional rotator used on forest machines, should be able to generate sufficient torque to cut the roots around stumps such as those used in this study.

Authors/Creators:Berg, Simon and Bergström, Dan and Athanassiadis, Dimitris and Nordfjell, Tomas
Title:Torque required to twist and cut loose Scots pine stumps
Series Name/Journal:Scandinavian journal of forest research
Year of publishing :2012
Page range:724-733
Publisher:Taylor & Francis
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Public
Agris subject categories.:K Forestry > K10 Forestry production
P Natural resources > P06 Renewable energy resources
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:bioenergy, force, cutting roots, stump harvesting, uprooting
Permanent URL:
Additional ID:
Type of IDID
ID Code:9326
Department:(S) > Dept. of Forest Resource Management
(NL, NJ) > Dept. of Forest Resource Management
External funders:Jämtkraft AB and Skellefteå Kraftaktiebolag and Skogforsk and Swedish Energy Agency and Swedish District Heating Association
Deposited By: Skogsbiblioteket Umeå
Deposited On:17 Dec 2012 15:50
Metadata Last Modified:02 Dec 2014 10:54

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