PT - JOURNAL ARTICLE ED - , AID - 10.48044/joa.1977.3.4.80 DP - 1977 Apr 01 TA - Arboriculture & Urban Forestry (AUF) PG - 80--80 VI - 3 IP - 4 4099 - http://auf.isa-arbor.com/content/3/4/80.short 4100 - http://auf.isa-arbor.com/content/3/4/80.full SO - JOA1977 Apr 01; 3 AB - Long, M.E. Chippers. Grounds Maintenance 11(11): 32, 34.Machines available for converting wood and brush into chips range all the way from huge, truckmounted units powered by 300-horsepower engines, and capable of gobbling logs up to 5 ft. in diameter, to small 5-horsepower units that can be pushed on their wheels to the job site. In selecting from all the available machines the one which will best meet your needs, there are many factors to keep in mind. As with any mechanical device, your chipper unit is ultimately going to need repair parts and service.