Proper leafblower!!
Lovely shot through the reed block, showing combustion process.
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[/youtubevideo]And side on...
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[/youtubevideo]Although easier to build, the reed material is the limiting factor to running duration.
Not a problem when its all going to go pop!
Commonest material is spring steel, but this tends to break down/melt at the edges, resulting in a loss of sealing ability. Its classed as a consumable item.