Reply
 
Thread Tools Search this Thread
 
Old 01 November 2007, 12:35   #1
alt
Member
 
Country: Ireland
Town: Galway, West Eire
Make: Cranchi
Length: 5m +
Engine: 2 x Volvo KAD300
Join Date: May 2006
Posts: 644
Send a message via MSN to alt
Implications of shaft being too long?

I have a small 3m inflatable tender that planes nicely with my 3.5HP short shaft. Problem is that it wont plane with 2 people in it.

So i've found a nice 6HP for it (boat can take upto 10HP) but it's a long shaft. Is there any drawbacks as to putting on a long shaft engine? Apart from it sitting in the water and more chance of hitting something... any safety or performance issues??
__________________

__________________
alt is offline   Reply With Quote
Old 01 November 2007, 12:45   #2
Member
 
Country: UK - England
Boat name: Seashell
Make: Redbay
Length: 7m +
Engine: Inboard diesel
Join Date: Jan 2004
Posts: 5,263
For that size don't worry about it you should be fine. I had a 2.6m inflatable once that we used to put a 6hp longshaft Johnson on and it ran fine - would plane easily with 2 people. You might get a bit of spray if your unlucky but thats about it.
__________________

__________________
Tim M is offline   Reply With Quote
Old 01 November 2007, 14:28   #3
Member
 
Country: Canada
Town: British Columbia
Make: Gemini
Length: 4m +
Engine: 40hp 2 str
Join Date: Oct 2003
Posts: 2,151
Have you tried googling " Shaft too long for inflatable " ?
__________________
prairie tuber is offline   Reply With Quote
Old 01 November 2007, 14:32   #4
alt
Member
 
Country: Ireland
Town: Galway, West Eire
Make: Cranchi
Length: 5m +
Engine: 2 x Volvo KAD300
Join Date: May 2006
Posts: 644
Send a message via MSN to alt
Quote:
Originally Posted by prairie tuber View Post
Have you tried googling " Shaft too long for inflatable " ?
Nice

Tim - Thank's for the reassurance. I would prefer a short shaft (run in shallower water etc) but i've spotted a nice 6HP for sale, just wanted to make sure I wasn't going to be wasting my time.
__________________
alt is offline   Reply With Quote
Old 01 November 2007, 15:29   #5
Member
 
Country: UK - England
Town: Ilford
Boat name: El Rekko
Make: DUX
Length: under 3m
Engine: 8hp OB
Join Date: Jun 2006
Posts: 17
Implications of shaft being too long?

Alt

Have a look here http://www.ribs.co.uk/page/choose_motor
__________________
Derrick is offline   Reply With Quote
Old 01 November 2007, 15:36   #6
alt
Member
 
Country: Ireland
Town: Galway, West Eire
Make: Cranchi
Length: 5m +
Engine: 2 x Volvo KAD300
Join Date: May 2006
Posts: 644
Send a message via MSN to alt
Derrick - Thanks for that.

Quote:
Will the wrong shaft length work on my boat ?

NO! Short shaft on a long transom may not even reach the water, water flow and cooling will be affected and performance will be dreadful. Long shaft on a short transom is dangerous. The point of thrust is way to low in the water and in the case of say 8 hp opening the throttle may flip a small boat over.
So I can try backflips? Woohoo!!!
__________________
alt is offline   Reply With Quote
Old 02 November 2007, 11:42   #7
Member
 
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
Quote:
Originally Posted by prairie tuber View Post
Have you tried googling " Shaft too long for inflatable " ?
That sounds like some of the spam I've been getting...


jky
__________________

__________________
jyasaki 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 15:27.


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