Reply
 
Thread Tools Search this Thread
 
Old 28 September 2014, 13:27   #1
Member
 
MrHeadsocket's Avatar
 
Country: UK - England
Town: Littlehampton
Boat name: Warrior
Make: Wetline
Length: 4m +
Engine: Yamaha 30HP Autolube
Join Date: Aug 2014
Posts: 116
RIBase
Send a message via Skype™ to MrHeadsocket
25HP on a 4.5m SIB - speeds?

Hi guys (and gals).

Following an awful start to my first venture with a boat when I was missold a 15HP Mariner, I have managed to win an auction of a 25HP Johnson and will hopefully be collecting in next weekend. My question is, what sort of speeds would I get with a 4.5m SIB (Ali floor), 25HP with 4 adults and about 15kg of kit? Will it plane? The max HP on the transom is 30HP so 25HP will do nicely! Cheers in advance!
__________________

__________________
MrHeadsocket is offline   Reply With Quote
Old 28 September 2014, 14:44   #2
Member
 
MrHeadsocket's Avatar
 
Country: UK - England
Town: Littlehampton
Boat name: Warrior
Make: Wetline
Length: 4m +
Engine: Yamaha 30HP Autolube
Join Date: Aug 2014
Posts: 116
RIBase
Send a message via Skype™ to MrHeadsocket
Also, what speed with 1 person and 15kg of kit? Cheers
__________________

__________________
MrHeadsocket is offline   Reply With Quote
Old 28 September 2014, 16:27   #3
Member
 
Country: UK - England
Town: Lincolnshire
Boat name: Mousetrap
Make: Zodiac Cadet 310S
Length: 3m +
Engine: Mariner 4 stroke 9.9
Join Date: Sep 2014
Posts: 221
It should certainly plane 4 up. As for the max speed, that will depend on lots of variables. It sounds like it should be a nice set up - plenty of space and enough power to have fun.
__________________
Mikefule is offline   Reply With Quote
Old 28 September 2014, 16:49   #4
Member
 
chriswood's Avatar
 
Join Date: Apr 2014
Posts: 94
Hi - I have a 3.8 Ali floor Sib with a 30hp and it gets on plane really easily with 2 adults, 2 teenagers and a child. With me and my 9 yr old daughter - not sure of speed as never tried to measure it but its very quick. Hope that helps!
__________________
chriswood is offline   Reply With Quote
Old 28 September 2014, 17:36   #5
Member
 
bingosucks's Avatar
 
Country: UK - England
Town: Nuneaton
Boat name: gnasher
Make: sr5.4
Length: 5m +
Engine: hidea 5 yam 90
Join Date: Oct 2011
Posts: 547
i reccons you`ll hit 20-25 thats a big sib, you will find shes more responsive with a bit of weight
__________________
bingosucks is offline   Reply With Quote
Old 02 October 2014, 13:10   #6
Member
 
Country: UK - England
Town: Plymouth
Boat name: The Micky
Make: Allpa 390
Length: 3m +
Engine: Mariner 25
Join Date: Aug 2013
Posts: 80
My 3.9 hit 28 knots in the calm with 25hp and 3 up. You should plane no problem!
__________________
tehguy is offline   Reply With Quote
Old 06 October 2014, 12:08   #7
Member
 
MrHeadsocket's Avatar
 
Country: UK - England
Town: Littlehampton
Boat name: Warrior
Make: Wetline
Length: 4m +
Engine: Yamaha 30HP Autolube
Join Date: Aug 2014
Posts: 116
RIBase
Send a message via Skype™ to MrHeadsocket
Thanks for the replies! The 25HP I was going to get fell through, but I currently have a 15HP that I may be getting rebuilt and in the process uprated to 20HP. What sort of speeds etc would I get with a 20HP and 4.5m SIB? Cheers in advance!
__________________
MrHeadsocket is offline   Reply With Quote
Old 13 October 2014, 06:38   #8
RIBnet admin team
 
Poly's Avatar
 
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: 2 stroke YAM 20 HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 10,114
Quote:
Originally Posted by MrHeadsocket View Post
Thanks for the replies! The 25HP I was going to get fell through, but I currently have a 15HP that I may be getting rebuilt and in the process uprated to 20HP. What sort of speeds etc would I get with a 20HP and 4.5m SIB? Cheers in advance!
20 knots ish (ie. +/- 3 knots).
__________________
Poly is online now   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 19:04.


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