Thread Tools Search this Thread
Old 28 July 2012, 15:00   #1
AMac's Avatar
Country: UK - Scotland
Town: Dunoon
Boat name: Celtic Wanderer
Make: Ribcraft
Length: 9m +
Engine: Volvo D6, Honda
MMSI: 235087784
Join Date: Nov 2011
Posts: 205
Jet drive or prop drive

Hi guys
At the moment this is a hypothetical question

Same boat, same conditions, same engine, same driver etc etc etc
Would a jet drive be faster, more economical etc than a prop driven boat?

AMac is offline   Reply With Quote
Old 28 July 2012, 15:06   #2
chewy's Avatar
Country: UK - England
Town: Up Norf
Make: Avon SR4,Tremlett 23
Length: 4m +
Engine: Yam 55, Volvo 200
Join Date: Apr 2007
Posts: 5,217

chewy is offline   Reply With Quote
Old 28 July 2012, 15:56   #3
CJL's Avatar
Country: UK - England
Town: London
Make: Ribcrafts
Length: 5m +
Engine: 150hp/2x115hp
MMSI: 235090215
Join Date: Oct 2002
Posts: 2,098
Send a message via Skype™ to CJL
Lots slower, its a very inefficient method of propulsion.
A registered charity supporting events across England and Wales
Follow us on Vimeo and Facebook
CJL is offline   Reply With Quote
Old 28 July 2012, 16:26   #4
Country: UK - Channel Islands
Town: Jersey
Boat name: Archangel
Make: Ribcraft
Length: 6m +
Engine: ETec 225
MMSI: 235063789
Join Date: Sep 2008
Posts: 1,005
It would be slower. A jet drive is about 60% efficient compared to a normal stern drive or outboard configuration. Power is lost mainly by converting helical thrust into linear thrust by passing it through stator vanes. Jets are also heavier, louder, vibrate more and are more expensive. However, they have one overriding advantage: they allow you to go places you wouldn't normally be able to reach. For example:
GJ0KYZ is offline   Reply With Quote
Old 29 July 2012, 02:51   #5
gohelm's Avatar
Country: Netherlands
Town: Goudswaard
Boat name: mr D
Make: Deltapower
Length: 6m +
Engine: Yamaha f300 BETU
Join Date: Nov 2010
Posts: 233
Much slower and much less economical - to illustrate:
I have a 6.8 m delta which had a hamilton jet and a 230 hp inboard yanmar which had max speed of 30 knots and cruising at 23kts on 25-26 lph. It has been converted to a 250hp suzuki outboard and now having top speed of 46 knots and cruising at about 32 knots on 19 lph.
gohelm is offline   Reply With Quote

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

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 09:55.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.