Gear Box Ratio and Prop RPM DE 38 Engines and Such Forums


Please consider registering

sp_LogInOut Log In sp_Registration Register

Register | Lost password?
Advanced Search

— Forum Scope —

— Match —

— Forum Options —

Minimum search word length is 3 characters - maximum search word length is 84 characters

sp_Feed Topic RSS sp_TopicIcon
Gear Box Ratio and Prop RPM DE 38
September 1, 1926 - 3:51 am
Member Since: October 11, 2021
Forum Posts: 3
sp_UserOfflineSmall Offline

I am about to buy a new inboard to replace my Volvo Penta 2003. I also have installed a new prop shaft and prop, cutlass bearing. At the moment I am looking at the Yanmar 40hp common rail that has great reviews of the Beta 38 hp. I am a bit concerned about lightning surges blowing the electronics of the yanmar but I love how efficient and quiet they are. Any input to help with this decision would be welcome.

The reason the this post is that I need to work out the required prop speed WOT. Each engine has different RPM and I need to work out the gearbox ratio required. I hope someone can help me. I have owned this boat for a year now, the honey moon is over and we are still in love. Hence treating her to a new shiny engine. See you all out there. R.

Also what is S/30 A/30 and R30 on the engine spec sheet? Thanks.

Print Friendly
Forum Timezone: America/New_York

Most Users Ever Online: 120

Currently Online:
10 Guest(s)

Currently Browsing this Page:
1 Guest(s)

Members Birthdays
Today None
Upcoming SVChangingSeas, 1stchoicecapn

Top Posters:

Jonathan Oasis: 174

bobmcd625: 165

CAE: 150

mgav451: 143

Rick: 94

svbodhran: 84

Member Stats:

Guest Posters: 7

Members: 362

Moderators: 1

Admins: 1

Forum Stats:

Groups: 3

Forums: 13

Topics: 742

Posts: 3831

Newest Members:

Duncan, MistyDawn, realitysailing, Kwally@sbmn, NetoMZT, JJB

Moderators: Patrick Twohig: 134

Administrators: Scott Carle: 1480