Current issue: 53(4)
Under compilation: 54(1)
The transport unit in roundwood towing on Lake Iso-Saimaa in Central Finland comprises a tug and a raft of bundled wood with a towline between them. There are several factors influencing the economic size of the transport unit in roundwood towing. These are changing with the enterprises and along with general developments. In this paper these factors or factor groups are seen from the point of view of the enterprise. The main question is to determine the most economic combination of tug and raft size.
From the point of view of the towing enterprises the unit costs of transport are the most decisive factor. Both the size of the raft as well as the power of the tug influence strongly the unit costs. As a long-term goal a raft of about 35,000 m3 and a tug of 550 kW or more is considered to be advisable. The width of channels and sounds then allow a free passage for rafts being 36–40 m wide.
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In Finland, the wage norms of forest wages have been defined by the government since 1935. However, no official tariffs have been drawn for mechanical bundling in water for floating in bundles. The aim of the investigation was to find out the correlation between the bundling result and the size of logs to be bundled, and how it affects the differences observed in earnings between the different types of devices used in the work. The aim is a more equal bundling tariff in cases where the log size is not the variable. The investigation was based mainly on diaries of bunders of Enso-Gutzeit Oy.
A tariff was formulated based on the results of the investigation. A unit tariff was obtained for bundling of timber differing in size by dividing the earnings of bundling an average timber by the unit number of logs differing in size from the average and bundled in a corresponding period. The tariff was not able to produce even earnings on all bunching machines, but a tariff that takes account log size may be recommended when the aim is an equal wage payment.
The article includes a summary in English.