I believe the difference is between rated HP and shaft HP, which is generally lower after things like transmission loss, accessory loads, and friction.
IIRC, an A4 was rated as 30HP, but the shaft HP was something like 17or 18. Which is why an2 cylinder Yanmar is a suitable replacement foe an A4. Rick Brass Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Joe Della Barba via CnC-List Sent: Monday, August 24, 2020 2:15 PM To: cnc-list@cnc-list.com Cc: Joe Della Barba <j...@dellabarba.com> Subject: Re: Stus-List 37+ Cruise Speed What the heck is a 13hp Atomic 4? Mine is 30 HP. Joe Coquina On 8/24/2020 1:26 PM, Daniel A. Willis via CnC-List wrote: My 1973 30' Mk 1 had a 13hp atomic four but was re-engine 12 years ago with a 20 hp Universal. She stops on a dime and handles very well with all that power. I suspect some might simply have been re-powered over the years as our Santiago was. _____
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