PCUK
regular
Reged: 29/06/2005
Posts: 1941
Loc: Devon
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After spending last year ashore waiting for appropriate weather for epoxying and many other jobs she was relaunched last November and last Thursday as the tide was in I finally took her out for a quick spin.
 Big disappointment as there is bad vibration from the prop' shaft. Spent £200 on a prop' overhaul and rebalace so don't think it's that. I've never had it before so am mystified as the prop' shaft is a high strength alloy and unlikely to have suddenly have bent itself! I'm hoping something has wrapped itself around the prop' in the five months she's been in her berth and will free off. Can't really afford another lift out just yet.
Replaced rear cutless bearing and fitted new PSS shaft seal but neither could cause this degree of vibration.
On a more interesting note, did some speed/consumption trials while out and returned these figures.
Displacement 14 tons.
WL length 33.5 feet
300 hp @ 2800rpm
3:1 box
2850 rpm 70litre pre hour 12 knots 
2400 rpm 45 lph 10.5 knots
2200 rpm 36 lph 10.2 knots
2000 rpm 30 lph 9.8 knots
1800 rpm 23 lph 9.2 knots
1600 rpm 18 lph 8.4 knots 
1500 rpm 16 lph 8.2 knots
1200 rpm 12 lph 7.1 knots
8 knots seems quite a pleasant speed!
Can't think why anyone else would be interested though!
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graham
regular
Reged: 16/05/2001
Posts: 6068
Loc: South Wales
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I hope the vibration is something easilly fixed.Rope round prop sounds likely ,is Pershilla suitable to dry out against the wall at Minehead?
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http://banjocoronado25.blogspot.com/
All Hardwood used in Banjos restoration comes from sustainable sources. Usually the Boat Club Skip :-)
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Sneddon
regular
Reged: 26/02/2007
Posts: 2320
Loc: Bristol
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Allways find fuel consumption/speed/rpm figures interesting, Yea I know I should get out more!
I am constantly amazed at how much more fuel is used for just a few more knots.
How much is diesel at Watchet these days? Thinking of coming down for the Minehead (new) lifeboat naming ceremony on May 3rd, we owe those guys a huge debt!
Anyone knows what happens to the old lifeboat?
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"See the rainbow not the rain"
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Damo
regular
Reged: 22/02/2005
Posts: 2626
Loc: k keeper,Portishead
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Well done - feels good doesn't it? 
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Never be at a loose end with the Yosemite bowline 
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PCUK
regular
Reged: 29/06/2005
Posts: 1941
Loc: Devon
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Graham, Yes she can dry out against a wall.
And that may be be the best idea.
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tangomoon
regular
Reged: 18/10/2004
Posts: 1487
Loc: SW
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Have you managed to put a kink in your propeller. Or has somebody taken a dislike to you and put the pipe grips on a wing and bent it a little? Hope you fid the cause will listen with interest.
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