Important features String trimmers
Curved shafts between the engine or motor and cutting lines are most common and can be easier to handle when trimming up close. Straight shafts tend to be better for taller users and when reaching beneath bushes and other shrubs. More come with a split shaft that comes apart to accept a leaf blower, edging blade, and other yard tools, though most add-ons aren't very effective.
A top-mounted motor eases handling for electric trimmers. Two cutting lines cut more with each revolution than one line. Most trimmers have a bump-feed line advance that releases line from a spool when you bump the trimmer head on the ground. A fixed-line head uses two fixed strips that are less convenient (you replace them as they wear) but eliminates jams and tangles.
Gas trimmers usually include a choke and primer bulb for cold starting. Some use a three-step starting system for easier starts, and more have spring-assisted starting that reduces pulling effort. A centrifugal clutch allows a gas engine to idle without spinning the line-safer and more convenient than models where the line keeps turning. Electric-trimmer lines don't spin until you press the switch.
Some models make edging more convenient with a rotating head that swivels into the vertical position for edging. Heavy-duty models often have a shoulder harness to ease handling. Other conveniences include easy-to-reach switches, comfortable handles, and a translucent fuel tank.
Curved shafts between the engine or motor and cutting lines are most common and can be easier to handle when trimming up close. Straight shafts tend to be better for taller users and when reaching beneath bushes and other shrubs. More come with a split shaft that comes apart to accept a leaf blower, edging blade, and other yard tools, though most add-ons aren't very effective.
A top-mounted motor eases handling for electric trimmers. Two cutting lines cut more with each revolution than one line. Most trimmers have a bump-feed line advance that releases line from a spool when you bump the trimmer head on the ground. A fixed-line head uses two fixed strips that are less convenient (you replace them as they wear) but eliminates jams and tangles.
Gas trimmers usually include a choke and primer bulb for cold starting. Some use a three-step starting system for easier starts, and more have spring-assisted starting that reduces pulling effort. A centrifugal clutch allows a gas engine to idle without spinning the line-safer and more convenient than models where the line keeps turning. Electric-trimmer lines don't spin until you press the switch.
Some models make edging more convenient with a rotating head that swivels into the vertical position for edging. Heavy-duty models often have a shoulder harness to ease handling. Other conveniences include easy-to-reach switches, comfortable handles, and a translucent fuel tank.
