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Old 23 July 2007, 19:16   #1
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Country: UK - England
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Lost Speed

I seem to have lost 10 kts off my performance. I have a rebuilt 91 2 st Yammy which was doing 36 kts but when I went for WOT the other day it would only deliver 26 kts. Some is down to weed as the boat is moored on a drying out mooring but I do not believe weed will take 10 kts off. (I last acid sprayed it about a month ago).

Any ideas and suggeestion are greatfully appreciated.

Thank you all

Ian
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Old 23 July 2007, 19:30   #2
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Depends on the fouling but you can easily lose 10kts or more!!!
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Old 25 July 2007, 20:02   #3
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We’ve just taken the stuff off the bottom of ours.. barnacles, slime, weed, things that were unidentifiable and the boat is flying again! So set to work.. it costs nothing except hard graft.
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Old 25 July 2007, 20:11   #4
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they guy who bought our last boat could not get his gin palace on the plane when it was covered in weed, it appears it can make quite a difference, i have never experienced it as always keep mine on the trailer
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Old 25 July 2007, 22:22   #5
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Are you still getting the same revs at WOT? That would tell you if it's a hull crud problem or an engine problem...

Is your prop in good shape? I just had mine tunes and had a few dings fixed... gained about 3 or 4 knots just from that bit...

Is your Missus accounted for? She's not dragging behind with her foot through a mooring line or anything is she?
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Old 26 July 2007, 12:02   #6
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Quote:
Originally Posted by Stoo View Post
Are you still getting the same revs at WOT? That would tell you if it's a hull crud problem or an engine problem...

Is your prop in good shape? I just had mine tunes and had a few dings fixed... gained about 3 or 4 knots just from that bit...

Is your Missus accounted for? She's not dragging behind with her foot through a mooring line or anything is she?
I don't have a rev counter (it's on the futures list but with a baby due in Nov the future is a long way away) but engine noise is very similar. Prop was new in the winter and has not touch a rock (YET).

I do spray the bottom every month or two but with the weather recently this has been problematic.

Thanks for all the suggestions.

Has anyone antifouled a moored 5.4 SR. what did you find?.

Ian
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Old 31 July 2007, 09:54   #7
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Ok guys.

I feel like an idiot now. Finally tides and work let me get on the beach to properly check the state of the weed growth it was horrific. Took 2 containers of acid to wash it off (nice stuff to work with - make sure you wear old clothes). Took her out a hey presto almost all my lost speed returned.

So anyone with a moored boat not antifouled heed my warning and check the weed growth more often.

Unfortunately on the way bak in I developed fuel probs so I now have to work out if I have a blockage somewhere, water in the fuel (have a filter on BUT) or pump problems. Ah the joys of owning a boat .

Happy ribbing
Ian
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Old 31 July 2007, 10:32   #8
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What acid are you using? Does it dissolve the barancles?
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Old 31 July 2007, 16:08   #9
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What acid are you using? Does it dissolve the barancles?
Never had any barnacles to try it on but it does keep the steps clear on the local quay so probably would do the job. It's a concentrated hydrochloric acid - be very careful when using. You can get it on your skin if you wash off within 15 minutes or so but longer would probably burn you.

Regards
Ian
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Old 31 July 2007, 16:40   #10
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Acid ey. Not heard of that one before. I spent about an hour and a half with a friend cleaning barnacles and slime off my hull this afternoon. Not something I wish to continue doing on a monthly basis. I'm either going to anti foul or put some other magic formula on when I take it out next month.

How easily does the nasty stuff come off with acid then? Is there any scrubbing required or just a rinse?
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