Disc or drum...?

[devon TWiG]

A mate of mine has had a Morbark chipper for over 20 years ( drum chipper ) and it is a fantastic bit of kit !!   The chips go in to a void / pocket behind the blade and then fly out under centrifugal force ..no blower needed . Very much less stress on machine as cutting with grain , and the drum is supported at each end by a good bearing which is far better than in the centre of a disc , the Morbark is a really well made machine the "tin work" is about 5 mm thick and all bearings are heavy duty and greasable !!