My props rotate the wrong way?!?

[Someday Lady II]

I thought all props ran counter wise.....is it because you have alpha drives?

On single I/O's and a large number of twins the props run clockwise. In twin applications the starboard drive will turn clockwise and the port drive counter clockwise. In most cases both engines turn in the same direction and the change in rotation occurs in the drive.

 

[dpmulvey]

JVM225, you're spot on about verifying that the gear boxes can work unboth directions. I plan on checking on it. I am not interested in ruining an otherwise perfectly good gearbox. The boat was repowered in 1996 with Volvo penta diesels and new running gear.

The hull does have prop tunnels. I am not sure why it would be a moot point. I have never noticed anyone with late '80's 390 EC's complain about sluggish response during manuevering. From the rubrail down the hulls are the same. Do prop tunnels help or hurt performance?

Nick K

Conventional wisdom says prop tunnels hurt more than help. I saw an interview a while ago with a former exec from Sea Ray on a show SR sponsored. He said the only reason prop tunnels exist is to allow the engines to sit lower in the ER and to lower the shaft angle.

However, there are prop tunnels and there are prop tunnels. I see them on Hatt and Cabo. The shape is not the same as mine. Where my 330 looks like triangular in shape, the Hatt and Cabo look more like it starts out as a long rectangle and morphs into a tunnel the closer it gets to the prop.

 

[Searaybio270]

While we are on this subject. Does anyone know what the rotation is on a 1996 400EC? I honestly have no clue and really would like to know. I have sent an email to SR/MM asking them - so far no response. Ok off to NY for the weekend.

 

[Jimmy Buoy]

Easy way to check for rotation... Watch the shaft while a buddy shifts from neutral to forward for each engine. They don't spin so fast at idle that you wouldn't be able to see what direction they are turning.

 

[billnpat]

On single I/O's and a large number of twins the props run clockwise. In twin applications the starboard drive will turn clockwise and the port drive counter clockwise. In most cases both engines turn in the same direction and the change in rotation occurs in the drive.

So why was i blessed with counter wise prop rotation ???

V drives???

 

[kostond]

So I was looking on YW last night at boats of similar vintage and style to mine and found a picture of a boat just like mine on slings. It appears that boat has props that spin like mine. (Port engine CW, Starboard engine CCW) I am beginning to think maybe that is how late 80's 390 Sedan Sportfish Searays were set up.

Nick K

 

[CSR_Admin]

The biggest benefit of prop tunnels is reducing draft.

Putting your props the right way and switching your cables will dramatically improve handling around the dock. I don't think you'll notice any change while underway.