Reply
 
Thread Tools Search this Thread
 
Old 12 May 2010, 11:37   #1
Member
 
Country: UK - England
Town: Manchester
Boat name: Bombay Sapphire
Make: Ribquest
Length: 5m +
Engine: Suzuki DF90(2004)
Join Date: Apr 2010
Posts: 23
Best size prop as we have no idea!!

Could some kind soul please advise me, what the best prop would be to use on a 5.3 Ribquest with a Susi DF90, twin console with forward seat in it,a 75 litre in console tank and rear 3 seat bench, we have no idea what the one thats on it at the mo is but about 30.5 knots is the fastest the Garmin has showing on it and we haven't managed to improve on that, it is rather quick out of the hole so I suspect its not got a large pitch on at the mo, we think more top end and less get up and go would be best, we tend to mostly be 3-4 persons onboard, I've heard that as the older DF90 (2004) has a lot of low down grunt it can take a pretty large pitch?? Cheers!
__________________

__________________
New to boating, unfortunately its not my boat either!
ajg74 is offline   Reply With Quote
Old 12 May 2010, 11:50   #2
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 12,826
RIBase
What revs is it doing at full throttle?
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 12 May 2010, 12:01   #3
Member
 
Country: UK - England
Town: Manchester
Boat name: Bombay Sapphire
Make: Ribquest
Length: 5m +
Engine: Suzuki DF90(2004)
Join Date: Apr 2010
Posts: 23
it will rev to 6k if you let it, easily, so am thinking its very under prop'd
__________________
New to boating, unfortunately its not my boat either!
ajg74 is offline   Reply With Quote
Old 12 May 2010, 12:52   #4
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 12,826
RIBase
You need to go up around 4" at a guess. Maybe more though if you're hitting the rev limiter.

What's the prop on there now?
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 13 May 2010, 08:04   #5
Member
 
Country: UK - England
Town: Manchester
Boat name: Bombay Sapphire
Make: Ribquest
Length: 5m +
Engine: Suzuki DF90(2004)
Join Date: Apr 2010
Posts: 23
No idea at the mo and the boat is in its storage home at the mo, I kind of remember the guy who sold it mentioning 15" though which I'm sure is too little for such a set up? Will have a look at it next weekend hopefully when we start prep'ing her for next bank holiday weekend! Another dumb question but with what other make of motors are Suzuki DF90's props interchangeable with, ie Yamaha etc?
__________________
New to boating, unfortunately its not my boat either!
ajg74 is offline   Reply With Quote
Old 13 May 2010, 12:46   #6
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 12,826
RIBase
Quote:
Originally Posted by ajg74 View Post
No idea at the mo and the boat is in its storage home at the mo, I kind of remember the guy who sold it mentioning 15" though which I'm sure is too little for such a set up? Will have a look at it next weekend hopefully when we start prep'ing her for next bank holiday weekend! Another dumb question but with what other make of motors are Suzuki DF90's props interchangeable with, ie Yamaha etc?
Buy a Suzuki prop to start with so you've got a baseline from a standard,known part.. If he said 15" that'd make 19" about right, which would generally be around the right size for a 90hp anyway.
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 13 May 2010, 13:15   #7
Member
 
samt's Avatar
 
Country: UK - England
Town: Midlands
Boat name: ...
Make: Avon SR4/Zodiac Clas
Length: 4m +
Engine: Yam 40/Mariner 30
Join Date: Jul 2006
Posts: 953
RIBase
Is this any use to you?

http://rib.net/forum/showthread.php?t=35747

The box says DT75, DT90, DT115, DT140.

I'm not sure if it fits the fourstroke range. But somone on here might know...
__________________
samt is offline   Reply With Quote
Old 14 May 2010, 06:46   #8
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
The older DF90 has a 2.59:1 gear ratio, so you'll need a coarse pitch prop. 15" is waaay too low. I'd suggest you start with a 19" or 21".

Ribcraft have rigged a lot of their 5.3m RIBs with DF90 motors, so perhaps a call to Jason, Dorian or Charlie at Ribcraft will get you some info on what props they have used on their boats.
__________________
Downhilldai is offline   Reply With Quote
Old 14 May 2010, 11:38   #9
Member
 
Country: UK - England
Town: Manchester
Boat name: Bombay Sapphire
Make: Ribquest
Length: 5m +
Engine: Suzuki DF90(2004)
Join Date: Apr 2010
Posts: 23
Cheers for all the replies on this guys, I think we might be going to check a few things on the boat this weekend (as its stored 30 miles away!)so I'll have a look at the prop thats on it if we do, I like the sound of a brand new one for 45quid!!
__________________
New to boating, unfortunately its not my boat either!
ajg74 is offline   Reply With Quote
Old 14 May 2010, 11:55   #10
Member
 
Erin's Avatar
 
Country: UK - Channel Islands
Town: A large rock
Boat name: La Frette
Make: Osprey Vipermax
Length: 6m +
Engine: 200 Suzzy
Join Date: May 2004
Posts: 2,853
I had a 19" on my DF90 on a 5.8 boat to start with then went up to 21. I'd suggest you try a 21.
__________________
Erin is offline   Reply With Quote
Old 14 May 2010, 15:08   #11
Member
 
Country: UK - England
Town: Manchester
Boat name: Bombay Sapphire
Make: Ribquest
Length: 5m +
Engine: Suzuki DF90(2004)
Join Date: Apr 2010
Posts: 23
Well it turns out its got a 19 on it already, the spare one is a 15 (ie useless really!), 21 it is then, when finances allow, the tow car is due a service first!! lol
__________________
New to boating, unfortunately its not my boat either!
ajg74 is offline   Reply With Quote
Old 14 May 2010, 19:51   #12
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 12,826
RIBase
What's the make of the prop on it? It's not plastic by any chance is it?
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 15 May 2010, 03:45   #13
Member
 
Erin's Avatar
 
Country: UK - Channel Islands
Town: A large rock
Boat name: La Frette
Make: Osprey Vipermax
Length: 6m +
Engine: 200 Suzzy
Join Date: May 2004
Posts: 2,853
Quote:
Originally Posted by ajg74 View Post
Well it turns out its got a 19 on it already,
Is it the right diameter. Sounds like it may be too small.
__________________
Erin is offline   Reply With Quote
Old 17 May 2010, 05:50   #14
Member
 
Country: UK - England
Town: Manchester
Boat name: Bombay Sapphire
Make: Ribquest
Length: 5m +
Engine: Suzuki DF90(2004)
Join Date: Apr 2010
Posts: 23
I'm going to have a proper look at it next weekend, as I said though the tow car os due a servcie so the prop will have to wait now, will just file out the couple of small nicks (which where in it when the boat was bought) and it will have to make do for now, cheers for all the responses though guys!
__________________
New to boating, unfortunately its not my boat either!
ajg74 is offline   Reply With Quote
Old 21 July 2010, 12:42   #15
Member
 
Country: UK - England
Town: portishead
Boat name: Megalou
Make: Ribcraft
Length: 5m +
Engine: Suzuki 90
Join Date: Mar 2009
Posts: 11
Quote:
Originally Posted by ajg74 View Post
I'm going to have a proper look at it next weekend, as I said though the tow car os due a servcie so the prop will have to wait now, will just file out the couple of small nicks (which where in it when the boat was bought) and it will have to make do for now, cheers for all the responses though guys!
Hi, Did you get further with this? I have the same engine on a 5.3 ribcraft with a 3x14x19" ali prop, max speed is 34knts at 5900 revs and would like to increase the top end speed if possible as mainly using rib 1 or 2 adults for fishing and dashing across the bay.
__________________

__________________
GINGERIB 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




All times are GMT -5. The time now is 10:16.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.