Reply
 
Thread Tools Search this Thread
 
Old 08 February 2006, 12:42   #11
exspyrd trayd membir
 
The Garfish's Avatar
 
Country: Ireland
Town: inn wiliks hed
Make: Redbay 6.5
Length: 6m +
Engine: Twin Etec 90hp
Join Date: Aug 2003
Posts: 962
Quote:
Originally Posted by signum
you mean manos witht the famous marco!!!!!!
noe yew nobbend. wee meen manoos wiv de famus bajja

gArf
__________________
luk arfter numbir wan, downt stepp inn numbir too
The Garfish is offline   Reply With Quote
Old 08 February 2006, 17:31   #12
Member
 
Country: Greece
Town: ATHENS
Boat name: AKOUNA MATATA
Make: X-TRIM
Length: 10m +
Engine: 2X225 4STR JOHNSON
Join Date: Feb 2006
Posts: 56
thank you also simon b for yr reply.... anyways asking also here the johnson and some friends mechanics i finally dropped the idea......
__________________

__________________
signum is offline   Reply With Quote
Old 09 February 2006, 09:21   #13
Member
 
Country: UK - Scotland
Town: Inverkip
Make: Redbay 11m Cabin
Length: 10m +
Engine: 2 x Yamaha422Sti 275
Join Date: Feb 2003
Posts: 567
Heading through to Edinburgh this morning I passed a RN Bomb Disposal Delta of around 7m fitted with twin Mariner 90 jet drives. Couldn't get a picture as on the phone at the time!!
Andy
__________________
Hard or Soft it's never BIG enough
Andy Gee is offline   Reply With Quote
Old 09 February 2006, 09:55   #14
Member
 
Country: Greece
Town: ATHENS
Boat name: AKOUNA MATATA
Make: X-TRIM
Length: 10m +
Engine: 2X225 4STR JOHNSON
Join Date: Feb 2006
Posts: 56
thanks andy...that y remembered it counts!
__________________
signum is offline   Reply With Quote
Old 10 February 2006, 17:45   #15
Member
 
Country: UK - England
Town: Looe
Make: Delta
Length: 4m +
Engine: Mercury
Join Date: Apr 2004
Posts: 1,335
Ive just taken those two jets off the bomb disposal boat. They dont like them. Ive done loads and loads of jet trials for the MoD on all sorts of boats and engines. Most people dont like them. The boat really really needs to be designed to have jets, the engines need to be lifted up by a few inches, so the intake is just in the water. You loose a massive amount of power (about a quater to a third of your power). They are also alot different to control. Like a jet ski you have to have some power on to control a turn. I think the only reason for having a jet is if your operating in very shallow water 90% of the time. That bomb disposal boat will do 26-27knts with the jets and with gearboxes (props i mean) its doing 36-37knts. Thats alot of difference. Also the impellers need quite alot of maintanance if they are worn of get some crap caught in them they loose even more power as the jet will not work efficiently. Also if your operating in shallow water the intakes do get bloked up with seaweed etc and some times need unbloking.
However they are a very good safety feature, especially for the diving teams, as they have people in the water all the time and very good for safety boat work. No one likes to have a prop spinning near them do they.
Or like i think if you have people near your engines in the water really why not just switch the engines off!!!
__________________
Turbodiesel is offline   Reply With Quote
Old 10 February 2006, 18:07   #16
Member
 
Country: Greece
Town: ATHENS
Boat name: AKOUNA MATATA
Make: X-TRIM
Length: 10m +
Engine: 2X225 4STR JOHNSON
Join Date: Feb 2006
Posts: 56
thank y turbodiesel for yr reply.
i didn't beleive that the differnce in knts would be that much!
the only reason why i made this thread in the beggining was because i was seeing the jet skiis day by day to increase here and i though...why not and in outboards?
__________________

__________________
signum 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 23:50.


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