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Props for Blaxland Single and Twin

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Garry Edwards
Member
Username: garry_edwards

Post Number: 6
Registered: 03-2005
Posted on Tuesday, March 28, 2006 - 04:38 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Trying to find the correct prop size for single and a twin Blaxland?


Many Thanks

Garry
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Bruce Findlay
Member
Username: bruce_findlay

Post Number: 7
Registered: 03-2006
Posted on Tuesday, March 28, 2006 - 04:30 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi Garry,
According to the parts list that comes with the SXT manual, the propellor for an SXT engine should be 3 bladed, 11" diameter x 10.5" pitch.
Cheers,
Bruce.
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Murray Hopkins
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Posted on Tuesday, April 11, 2006 - 10:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I have a 3.5 Blaxland in a 13 ft Clinker.
It runs a 13 x 13 prop set up and matched to the boat by Aub Rose 20 years ago.
Like all engines the prop size required will be largly determined by boat size, weight, shape etc.
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Bruce Findlay
Member
Username: bruce_findlay

Post Number: 10
Registered: 03-2006
Posted on Tuesday, April 11, 2006 - 11:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Here's an interesting link on propeller sizing:

http://www.alloutdoorgear.org/boat-propellers.asp?keyword=boat-propellers-sizing &engine=google&contextual=no
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Murray Hopkins
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Posted on Thursday, April 13, 2006 - 05:54 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I should have mentioned, my prop is a 3 blade.
It is also interesting to note that before Aub fitted the 13 X 13 x 3 blade the boat had a 14 x 14 x 3 Blade with trimmed tips, probable to make it fit in the space available. With the 1 inch bigger prop the motor would not accelerate very well, was short of top RPM and the motor lugged and ran poorley.In my case the that extra one inch was quite a big difference.
I have also owned both small and large inshore and offshore racing boats, it is even more critical if you are looking for a competetive edge.

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