Reply
 
Thread Tools Search this Thread
 
Old 03 October 2013, 09:24   #1
Member
 
Country: Ireland
Town: Castlebar
Boat name: Clewless
Make: Valiant DR 490
Length: 4m +
Engine: 60 hp ETEC
MMSI: Awaitng one
Join Date: Oct 2007
Posts: 1,239
RIBase
Riding on the back of a wave in a following sea

Has anyone ever noticed that when riding on the back of a wave in a following sea, that the power sometimes seems to get robbed from the engine and the engine will sometime appear to labour?

I assume that this is due to the circulr motion that a water particle has within a wave and this motion is trying to pull the boat down the back of athe wave.

TSM
__________________

__________________
two stroke mick is offline   Reply With Quote
Old 03 October 2013, 09:42   #2
Member
 
The Black Pig's Avatar
 
Country: UK - England
Town: Salcombe
Boat name: The Black Pig
Make: Ranieri
Length: 4m +
Engine: 60c hp tohatsu
MMSI: 235038018
Join Date: Jun 2013
Posts: 316
Send a message via AIM to The Black Pig
Yes I have have noticed this too, first time it was quite alarming as I was in big seas over a bar, thought I had lost the prop or sumitt
__________________

__________________
The Black Pig is offline   Reply With Quote
Old 03 October 2013, 09:57   #3
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
It's just the fact your trying to drive the boat up a big hill.... usually water is flat!
__________________
PeterM is offline   Reply With Quote
Old 03 October 2013, 10:11   #4
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: 7,590
RIBase
Quote:
Originally Posted by two stroke mick View Post
Has anyone ever noticed that when riding on the back of a wave in a following sea, that the power sometimes seems to get robbed from the engine and the engine will sometime appear to labour?

I assume that this is due to the circulr motion that a water particle has within a wave and this motion is trying to pull the boat down the back of athe wave.

TSM
I remember one particular incident coming out of Milford Haven round St Annes head, we had a 6.4m Osprey at the time with a 175hp inboard. As we rounded the head we hit a patch of standing waves & got half way up the back of one & then started to slide backwards 4rse first into the trough & this was at WOT The boat was near vertical & I thought she was going over backwards, luckily we managed to crest the wave & escape, scary
__________________
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 03 October 2013, 10:40   #5
Administrator
 
John Kennett's Avatar
 
Country: UK - England
Town: Brighton
Length: 3m +
Join Date: May 2000
Posts: 6,830
Horsepower doesn't count for much when you're pointing into the sky, and as it's slow going in these conditions you're effectively trying to do a standing start up a very steep hill.

The "Isle of Man" trip a few years ago saw us in some interesting conditions off Anglesey, stern sliding a big Ribcraft with 250 screaming horsepower doing nothing at all. Poly seemed to take it in his stride, but the rest of my crew have never set foot in a boat again!
__________________
John Kennett is offline   Reply With Quote
Old 03 October 2013, 10:43   #6
Member
 
Adamn's Avatar
 
Country: UK - England
Town: Helston
Boat name: Myrtle
Make: Zodiac pro 500
Length: 4m +
Engine: Outboard 60hp
Join Date: Sep 2012
Posts: 255
Not nice looking at the sky in a NASA launch position!!
This happened to me going to the Scillies with Whisper and company on the Runnel Stone just off Lands end.
Not much fun in a small Rib.
__________________
Adamn is offline   Reply With Quote
Old 03 October 2013, 11:05   #7
Member
 
Country: UK - England
Town: Bristol
Make: Ribcraft
Length: 5m +
Engine: Yamaha
Join Date: May 2006
Posts: 4,194
Not much fun in a small rib!! Awesome fun in a small rib
__________________
matt h is offline   Reply With Quote
Old 03 October 2013, 11:18   #8
Member
 
Adamn's Avatar
 
Country: UK - England
Town: Helston
Boat name: Myrtle
Make: Zodiac pro 500
Length: 4m +
Engine: Outboard 60hp
Join Date: Sep 2012
Posts: 255
Quote:
Originally Posted by matt h View Post
Not much fun in a small rib!! Awesome fun in a small rib
Not when you really really think you are going over! It stayed vertical for several seconds before dropping back down. The rubber seal on the engine cover actually got turned up at the back.
__________________
Adamn is offline   Reply With Quote
Old 03 October 2013, 11:35   #9
Member
 
Maximus's Avatar
 
Country: UK - England
Town: Wild West
Boat name: No Boat
Make: No Boat
Length: under 3m
Join Date: Jan 2008
Posts: 4,272
Send a message via AIM to Maximus
Quote:
Originally Posted by matt h View Post
Not much fun in a small rib!! Awesome fun in a small rib
Yeah till YOU Stuff it!!! eh Matt!
__________________
A clever Man learns by his mistakes..
A Wise Man learns by other people's!

The Road to HELL ..is Paved with "Good inventions!"
Maximus is offline   Reply With Quote
Old 03 October 2013, 11:37   #10
Member
 
kerny's Avatar
 
Country: UK - England
Town: Ashton-under-Lyne Lancs
Boat name: IMOGEN
Make: Air-Craft 5.4
Length: 5m +
Engine: Etec 60
MMSI: 235087492
Join Date: May 2010
Posts: 7,040
RIBase
Send a message via Skype™ to kerny
Quote:
Originally Posted by matt h View Post
Not much fun in a small rib!! Awesome fun in a small rib
Yeah but your nuts
__________________

__________________
Member of S.A.B.S. (Lancashire Division)
kerny 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 23:53.


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