Reply
 
Thread Tools Search this Thread
 
Old 07 July 2013, 16:35   #1
Member
 
Country: UK - England
Town: Sussex
Boat name: Bombard, Y-162
Make: Aerotec 380, Y-Class
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 2,692
3 kts down, where's it gone?

Puzzling really, nothing had changed in my SIB setup, same 3.4m SIB and 9.8 Twat, same loading etc but we used to touch 17.5 kts and consistently now in flat water we max out at 14.5 kts.

AFAIK engine is running sweetly, prop perfect, fuel fine, carb was cleaned out about 20 hrs use ago.

Any ideas?

__________________

__________________
Max... is offline   Reply With Quote
Old 07 July 2013, 16:53   #2
Member
 
Country: UK - England
Town: macclessfield
Boat name: Reach Out
Make: Quicksilver
Length: 4m +
Engine: 30hp Tohatsu EFI
Join Date: Aug 2010
Posts: 301
Tide going other way ?
__________________

__________________
simsy is offline   Reply With Quote
Old 07 July 2013, 17:03   #3
Member
 
Country: UK - England
Town: Sussex
Boat name: Bombard, Y-162
Make: Aerotec 380, Y-Class
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 2,692
No, just to confirm this is consistent across various trips and sea times and on the river too.
__________________
Max... is offline   Reply With Quote
Old 07 July 2013, 17:05   #4
RIBnet admin team
 
willk's Avatar
 
Country: Ireland
Make: Redbay Boats
Length: 9m +
Engine: 370hp
Join Date: Feb 2008
Posts: 12,928
RIBase
Too many mince pies over the winter?

No, srsly, trim position, load balance, pressure gauge faulty?
__________________
"Who knows what evil lurks in the hearts of men?"
.
willk is offline   Reply With Quote
Old 07 July 2013, 17:14   #5
Member
 
Country: UK - England
Town: Sussex
Boat name: Bombard, Y-162
Make: Aerotec 380, Y-Class
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 2,692
Nah, all the same there too Willk.

Same trim, same load, pressures all double checked...
__________________
Max... is offline   Reply With Quote
Old 08 July 2013, 00:24   #6
RIBnet supporter
 
Pikey Dave's Avatar
 
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 7,597
RIBase
What are you using to measure your speed, GPS, pitot?
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4: See rule#5
Pikey Dave is offline   Reply With Quote
Old 08 July 2013, 02:34   #7
Member
 
Country: UK - England
Town: Sussex
Boat name: Bombard, Y-162
Make: Aerotec 380, Y-Class
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 2,692
Hi Dave, Garmin GPS.
__________________
Max... is offline   Reply With Quote
Old 08 July 2013, 04:01   #8
Member
 
Country: UK - England
Town: Surrey
Boat name: Fugly & Rokraider 1
Make: Pac 22 & Porter 6.5
Length: 6m +
Engine: Ford 250 & jet,DT140
Join Date: Jun 2008
Posts: 681
Throttle cable adjustment? Found mine had loosened itself and wasn't getting full throttle.
__________________
Rokraider is offline   Reply With Quote
Old 08 July 2013, 06:23   #9
Member
 
Country: UK - England
Town: Sussex
Boat name: Bombard, Y-162
Make: Aerotec 380, Y-Class
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 2,692
I'll check that, otherwise could it be gummy jets?
__________________
Max... is offline   Reply With Quote
Old 08 July 2013, 16:39   #10
Member
 
Locozodiac's Avatar
 
Country: Other
Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider Boats
Length: 4m +
Engine: Tohatsu 18 /30 HP
Join Date: Sep 2007
Posts: 1,706
Or prop light spun could be beginning to happen and worsen with more use. Borrow same prop pitch and test if possible. Engines doesn't work same on every day basis, it's a environmet outside temp, water temp, atmospheric pressure issues, but not that picky so to loose 3 knts though.

Happy Boating
__________________

__________________
Locozodiac 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 11:58.


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