[alberg30] A30 props TIP CLEARANCE

[John Birch]

From: John Birch <Sunstone at idirect.com>

Tip clearances according to Skene's is 10% of  Prop Diameter for a 2
blade, 15% of  Prop Diameter for a 3 blade.
I.e. A 10" prop dia requires a 1.5" tip clearance minimum, for a 3
blade, from any part of the boat or aperture in that plane.
Cheers,
John

Bob Lincoln wrote:

> From: "Bob Lincoln" <lincoln at cc.UManitoba.CA>
>  A web site regarding propeller selection is ...www.properpitch.com.
> Generally speaking the Atomic 4 direct drive uses a smaller pitch and
> has a higher rpm than diesels on the A30 that have a reduction gear
> similar to yours.  Check your engine specs to determine at what rpms
> you develop maximum horsepower, and go from there.  The older design
> books also suggest what tip clearances you should have in the prop
> aperture.Bob LincolnIndigo 590
>
>      -----Original Message-----
>      From: Peter Amos [mailto:P.A.Amos at tesco.net]
>      Sent: Sunday, January 16, 2000 1:51 AM
>      To: Alberg 30
>      Subject: [alberg30] A30 props
>
>      From: "Peter Amos" <P.A.Amos at tesco.net>[Bob Lincoln
>      commented:] ... Is there a site that gives prop sizes for
>      boat and power combinations?Peter Amos "Tait Tait" 478
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