Reply
 
Thread Tools Search this Thread
 
Old 17 June 2009, 04:07   #1
Member
 
Country: UK - England
Town: Brixham
Boat name: no name
Make: no name
Length: 5m +
Engine: no name
Join Date: Mar 2009
Posts: 17
Avon 620 open adventurer Yamaha F115 4 stroke

Bought this bought about a month ago and loving it with the family. The only thing is when I 1st bought it it would do about 33 mph at WOT (5000rpm). A month on it is only doing about 25 mph. It is moored at a marina and there's a little growth on the hull...but would this make a real difference? The engine is 2007 still under warranty and sounds and runs fine. it has a standard 17" prop. Would going to a slightly larger prop make that much difference / damage the engine?

Cheers for any thoughts.

Prattyboy
__________________

__________________
Prattyboy is offline   Reply With Quote
Old 17 June 2009, 04:38   #2
Member
 
Country: UK - England
Town: Dorset & Hants
Boat name: Streaker/Orange
Make: Avon/Ribcraft
Length: 4m +
Engine: 50Yam/25 Mariner
Join Date: Apr 2007
Posts: 5,551
I think that a months growth in the recent warmish weather is your problem. Try taking it out of the water , clean it & then see if you get the MPH back .
__________________

__________________
PeterM is offline   Reply With Quote
Old 17 June 2009, 05:04   #3
Member
 
Country: UK - England
Town: Gloucestershire
Boat name: Osprey
Make: Osprey Vipermax
Length: 5m +
Engine: E-tec 300 G2
MMSI: TBC
Join Date: Dec 2006
Posts: 4,013
2 weeks in a marina saw me loose 3 knots.
__________________
---------------------------------------------------
Chris Stevens

Born fiddler
Chris is offline   Reply With Quote
Old 17 June 2009, 10:13   #4
Member
 
Country: UK - England
Town: Brixham
Boat name: no name
Make: no name
Length: 5m +
Engine: no name
Join Date: Mar 2009
Posts: 17
thanks for replies. Growth looks like it's fairly well advanced so will take out this weekend. Apart from pressure hose cleaning is there any solution you can recommend?
__________________
Prattyboy is offline   Reply With Quote
Old 17 June 2009, 10:22   #5
Member
 
Country: UK - England
Town: Dorset & Hants
Boat name: Streaker/Orange
Make: Avon/Ribcraft
Length: 4m +
Engine: 50Yam/25 Mariner
Join Date: Apr 2007
Posts: 5,551
I find just elbow grease & a light green scouring type pad - take the growth off without scratching the gel.
__________________
PeterM is offline   Reply With Quote
Old 17 June 2009, 10:30   #6
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Quote:
Originally Posted by Blackroady View Post
I find just elbow grease & a light green scouring type pad - take the growth off without scratching the gel.
I agree - unless you have barnacles and then you need a plastic windscreen scraper.
__________________
codprawn is offline   Reply With Quote
Old 17 June 2009, 10:54   #7
Member
 
Country: UK - England
Town: Dorset & Hants
Boat name: Streaker/Orange
Make: Avon/Ribcraft
Length: 4m +
Engine: 50Yam/25 Mariner
Join Date: Apr 2007
Posts: 5,551
Quote:
Originally Posted by codprawn View Post
I agree - unless you have barnacles and then you need a plastic windscreen scraper.
Good point - mine live in fresh water , apart form the odd few days here & there - so never really seemed to affect me . Do barnacles even live in fresh water ? Never occured to me before !
__________________
PeterM is offline   Reply With Quote
Old 17 June 2009, 22:57   #8
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Quote:
Originally Posted by Blackroady View Post
Good point - mine live in fresh water , apart form the odd few days here & there - so never really seemed to affect me . Do barnacles even live in fresh water ? Never occured to me before !
No and it's a good way to remove them - stick the boat in fresh and it kills them off - doubt it will remove the rings they leave behind though - you need acid for that!!!
__________________
codprawn is offline   Reply With Quote
Old 18 June 2009, 01:15   #9
Member
 
Country: UK - England
Make: Ballistic 7.8
Length: 7m +
Engine: 250hp E-Tec
Join Date: Nov 2006
Posts: 52
My Humber needs a clean speed down from 52mph to 42mph, makes a big difference but in lazy mode at the minute.
__________________
mikesyam is offline   Reply With Quote
Old 18 June 2009, 02:13   #10
Member
 
Country: UK - England
Town: Scillies
Boat name: Freedom
Make: Searider
Length: 5m +
Engine: Yam 2st 90
Join Date: Jan 2007
Posts: 335
I use concentrated hydrochloric acid from a garening type spray can. Just spray it on leave 5 mins and wipe off with a deck scrubber. Reapply on the odd patch that didn't completely wipe off.

It is used on all the quays around the islands as well as it doesn't do any damage to the envirnment.

ian
__________________

__________________
walruz is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 14:53.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.