I am selecting the components for my autopilot
and am most likely going to go with a Raymarine
Evolution system. The boat in question is a 57ft full keeler displacing 30,000kg and is steered using 2 Hy-Drive 313 linked in series.
According to the Raymarine site
, I only require a little type 1 pump for this setup. They clearly say that displacement
does not factor in and only the ram cylinder size matters.
It just seems strange to me that such a big boat can be steered with the same pump as you would find on a 30ft light displacement
production boat with a fin keel
Should I go a size to a type 2 to be safe or am I overthinking this?