Product Highlight HANSA C13 and C21 PTO Wood Chipper Simply hitch our PTO chippers to your 540 RPM PTO and you have a machine that has the same if not more capabilities as it's engine powered equivalent. The Hansa C13 and C21 PTO Wood Chippers are leading in its class. Both units are gravity-fed machines and come standard with a 270° rotating outlet chute. The Hansa C13 can process up to 90 mm in diameter while the C21 goes to a huge 130 mm capacity. Powered by tractors between 17 and 55 HP, these machines are an ideal addition to your PTO driven attachments.