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Machinery demo at Blackbushe Estate
Forestry Memories
 Open Document 
No: 3956   Contributor: Norman Davidson   Year: 1958
Machinery demo at Blackbushe Estate

Photograph is courtesy and copyright of Forestry Commission, Forest Research, Roslin, and provided with help from Glen Brearley. FR Photo number No A1868 taken by T K Wood.

Little information on this machine and operation other than one name ‘Rotaped’ demonstrating at Blackbushe , Edinburgh.

The tractor is an International B250 Diesel according to the machine logos. The track assembly is very unusual as it does not appear to run on a frame! Looking closely the track is made up of six rigid plates, hinged at their ends where sprockets are also fixed. A heavy chain encloses three alternate sprockets in a closed circuit and another chain the other three. It is assumed this arrangement is mirrored on other side of the driving sprocket. As the sprocket drives the track around the chains maintain the track profile as seen. Very clever bit of engineering!
Has anyone seen this system before?
Picture added on 27 February 2018 at 15:00
add commentComments:
That idea has been around for a long time, there are numerous examples on Google but I have never seen it on such a modern tractor before.

Added by Jimmy Thain on 11 March 2018.
The tracks look like Rotaped tracks very common on Howard draining machines in the 1950s, and the dozer blade is a Leeford 'Muledozer'.

The Rotaped tracks were also made by Leeford in the later years of their production - up until the mid 1960s.

Added by David Shearer on 24 March 2018.
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