Hi,
My engine is mounted on a transom between the hulls. The cavitation plate is under the water but of course the water level changes between the hulls when small waves pass between them and the hulls themselves do not respond.
My boat is an old sailing catamaran an 8m Bobcat and I am looking for power not speed but without cavitation. How long should the shaft be? The boat transom height is about 20in/500mm.
Using a Honda BF15A Old Style engine with the Long (because Extra Long very difficult to obtain) Shaft (570mm/22.4in) I have a cavitation problem when turning or in a choppy sea. Any ideas - I cannot reconfigure my boat or use a lowering bracket. Maybe there are other similar sized engines with longer shafts in some parts of the world, unfortunately, there don't seem to be many in Europe of a similar hp/spec.
Thanks, John (Scotland)
My engine is mounted on a transom between the hulls. The cavitation plate is under the water but of course the water level changes between the hulls when small waves pass between them and the hulls themselves do not respond.
My boat is an old sailing catamaran an 8m Bobcat and I am looking for power not speed but without cavitation. How long should the shaft be? The boat transom height is about 20in/500mm.
Using a Honda BF15A Old Style engine with the Long (because Extra Long very difficult to obtain) Shaft (570mm/22.4in) I have a cavitation problem when turning or in a choppy sea. Any ideas - I cannot reconfigure my boat or use a lowering bracket. Maybe there are other similar sized engines with longer shafts in some parts of the world, unfortunately, there don't seem to be many in Europe of a similar hp/spec.
Thanks, John (Scotland)