Reply
 
Thread Tools Search this Thread
 
Old 15 April 2013, 19:01   #31
Member
 
m chappelow's Avatar
 
Country: UK - England
Town: yorkshire
Boat name: little vicky
Make: avon ex RNLI
Length: 3m +
Engine: tohatsu
Join Date: Mar 2008
Posts: 2,310
Quote:
Originally Posted by Dragonhawk ficht View Post
moto


Any thoughts on why the engines failed on that rib in the vid, I thought maybe fuel tank was only quart full, and that wave that nearly backfliped them might have caused fuel air lock maybe?

Some would probably say shit in the carbs, I tried this once and burnt my arse on the flywheel, not recomended!!
Most likely reason why the engines stalled is that full throttle was not applied when the stern submerged itself,
one factor when the Atlantic 75 went up a size in engines making the stern that bit heavier ,

full throttle applied just before landing as well as keeping the engines from exhaust back pressure stalling the propeller thrust also helps stop the stern from going under even more.

On the subject of Drouges & sea anchors ( sea anchor if its streamed from the bow & drouge if its streamed from the stern)
the longer the line the better ideal you want to have it at least 2 or 3 waves out from the boat , one of the reasons in the video that the boat was pushed sideways until the anchor deployed (if your in the same breaking wave as the anchor it wont help much .

Buckets do work but usually the handle will come off ,

its also suprizing how much resistance even the small parachute type exerts when trying to recover it ,a separate trip line to the top of the parachute type helps though from experience usually gets wrapped around the main line making it useless.
__________________

__________________
m chappelow is offline   Reply With Quote
Old 15 April 2013, 19:55   #32
Dhf
Member
 
Dhf's Avatar
 
Country: UK - Wales
Length: no boat
Join Date: Jan 2012
Posts: 1,012
Quote:
Originally Posted by m chappelow View Post
Most likely reason why the engines stalled is that full throttle was not applied when the stern submerged itself,
one factor when the Atlantic 75 went up a size in engines making the stern that bit heavier ,

full throttle applied just before landing as well as keeping the engines from exhaust back pressure stalling the propeller thrust also helps stop the stern from going under even more.

On the subject of Drouges & sea anchors ( sea anchor if its streamed from the bow & drouge if its streamed from the stern)
the longer the line the better ideal you want to have it at least 2 or 3 waves out from the boat , one of the reasons in the video that the boat was pushed sideways until the anchor deployed (if your in the same breaking wave as the anchor it wont help much .

Buckets do work but usually the handle will come off ,

its also suprizing how much resistance even the small parachute type exerts when trying to recover it ,a separate trip line to the top of the parachute type helps though from experience usually gets wrapped around the main line making it useless.
I though full throttle landing at that angle would course definate backflip, but I dunno just wouldn't like to try meself with that head wind.
As for drogues I always thought they where for yachts thrown over the stern in heavy following seas, but I see it was quit usefull for that rib too.
__________________

__________________
Dhf is offline   Reply With Quote
Old 16 April 2013, 03:26   #33
Member
 
Leapy's Avatar
 
Country: UK - England
Town: Sheepy Parva
Boat name: Sadly Sold
Length: no boat
Join Date: Sep 2008
Posts: 1,728
Quote:
Originally Posted by "Mollers;
Even our SR has an Icom baseset, allbeit, with a Ribraider twig. :
If I hadn't have heard it from the man himself ...
__________________
Leapy is offline   Reply With Quote
Old 16 April 2013, 03:42   #34
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
If this was an RNLI exercise is it possible the engines were cut to practice there emergency drill in such conditions?
It was filmed which I take would of been used to point out areas for future events (like not nearly turning it over)
__________________
Adamn is offline   Reply With Quote
Old 16 April 2013, 03:58   #35
Member
 
Ribochet's Avatar
 
Country: UK - N Ireland
Town: Rostrevor
Boat name: Ricochet
Make: Redbay
Length: 7m +
Engine: Twin F115 Yams
MMSI: 235083269
Join Date: Oct 2011
Posts: 911
Quote:
Originally Posted by Dragonhawk ficht View Post
Any thoughts on why the engines failed on that rib in the vid,
The RIB in question was an Altantic 75 fitted with 2-stroke engines that were extensively modified by the RNLI to make them inversion proof.
These mods included:
Six mercury tilt switches operate mechanisms to shut off the air inlet, cut off the engines, lock the engine tilt mechanism and turn on capsize lights if the boat reaches an angle of heel of 90 degrees
The exhaust system has a u-tube assembly and one way exhaust valves to prevent water entering when the engine is inverted
A closed carburettor system is used to prevent fuel leakage The engines undergo fortnightly maintenance to ensure they start first time, each time, and can be restarted following a capsize.

These however had the tendency to kick in and shut down the engines when the boat was at the angle shown in the video .
__________________
Maximum Preparation - Maximum Fun
Ribochet is offline   Reply With Quote
Old 16 April 2013, 04:03   #36
Member
 
Country: UK - England
Town: South Coast
Length: 9m +
Join Date: Feb 2013
Posts: 26
I bought a sea anchor thingy not so much for the safety point of view as they are defo another piece of safety equipment, but for those days I just want to drift and have a beer and a chat with friends. As people say it stops the boat rocking side to side as the bow is nicely into the waves. When you are trying to eat crisps n dips as the boat rocks it is a bit of a bummer!!

From the safety point of view, I look at it as another form of getting close to safety, you could use it to slow down the progress of wind drift or tide towards rocks, or the opposite of such and use the tide to take you away from the rocks and or to a safer place . .

So yes for me worth having as a simple stand alone piece of harmless safety armoury and a brilliant CLEAN way of steading the boat when having a break or a 'party'!
__________________
Ribbed41Pleasure is offline   Reply With Quote
Old 16 April 2013, 04:08   #37
Member
 
Country: UK - England
Town: South Coast
Length: 9m +
Join Date: Feb 2013
Posts: 26
And of course one of the things you get in a survival pack is sea sickness tablets, because the quickest way to de-hydration is being sick. We all know how quickly people feel ill when you stop the boat and generally it is the rocking motion that does it. So regardless of whether they are good at much else in a disaster, they might just make your RIB that is now a life raft, one hell of a better place to 'survive' until the Chopper comes to get you!
__________________
Ribbed41Pleasure is offline   Reply With Quote
Old 16 April 2013, 06:19   #38
Member
 
paddlers's Avatar
 
Country: UK - England
Town: Sticks, N.Yorks
Boat name: Tamanco
Make: Honwave 3.5AE
Length: 3m +
Engine: Tohatsu Outboard
Join Date: May 2012
Posts: 1,063
I bought one off fleabay mainly to steady the boat & slow it down when drifting to fish. Gives you a much more pleasant sea experience when you've got the family with you plus given that it folds up very flat takes up hardly any room!
Added advantage it's another piece of 'safety' kit alongside all the usual !!
__________________

__________________
paddlers 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 02:11.


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