Reply
 
Thread Tools Search this Thread
 
Old 25 September 2006, 17:21   #1
Member
 
Country: UK - England
Town: IoW
Make: HysuCat 6.5
Length: 6m +
Engine: 2 x Yamaha 70 2s
Join Date: Oct 2004
Posts: 71
5.4 Searider prop

hi

on my 5.4 searider im running a yamaha 75 2 sroke. at wot the engine revs to about 6000 rpm hitting upto 30kt.

what props do any of you other searider owners use?

and what speed should i hope for

sorry if its been asked before, i did a search but couldnot find.

thanks
__________________

__________________
118118 is offline   Reply With Quote
Old 25 September 2006, 17:28   #2
Member
 
Country: UK - England
Town: Enfield/Switzerland
Boat name: Zonneschijn II/Vixen
Make: Shakespeare/Avon
Length: 7m +
Engine: Evin' 175 DI /Yam 90
MMSI: 235055605
Join Date: May 2006
Posts: 1,418
Hi,

Don't know what prop I have but get 35-36 knots with a yammie 90 and 2 up, with light load and only about 25 litres on board.

Hope that helps

Neil
__________________

__________________
Neil Harvey is offline   Reply With Quote
Old 25 September 2006, 17:33   #3
Member
 
Country: UK - England
Town: Southampton
Boat name: SMH Rib / War Shot
Make: Ribtec / Scorpion
Length: 4m +
Engine: 10hp Yam / 150hp opt
Join Date: Sep 2003
Posts: 1,894
RIBase
6000 - too high?

6000 sounds a little high. - Have a look in your manual to see what you should be pulling- probably a little less I would guess. My 90hp Mariner on a 5.4 Searider would pull about 5450 on a 20" Lazer II stainless prop - for just under 40kts. Pulled about the same rpm but less speed on a 19" Aluminium prop.

Suggest that you need to increase your pitch by 1-2". 200rpm per inch is often given as a rule of thumb.

I reckon you should be able to improve on your 30 knots by a few knots - probably at no extra fuel burn.

Secondhand prop(s) are the only way imho to decide what works best - or borrow them from the very helpful members on here!

Bought my stainless Lazer II for the Searider from a member on "Hotribs" - about 100 - was confident I could sell it for about the same if it was no good.

19" Lazer II on the Scorpion came from Pete 7 on here - works well and paid about half new retail cost. Works well and could have sold it for about the same price if no good.

Have fun with the boat and remember - even if a stainless propeller gives no performance advantage - at least it's shiny!
__________________
Searider is offline   Reply With Quote
Old 25 September 2006, 17:46   #4
Member
 
Lets go boating's Avatar
 
Country: UK - England
Town: Staffordshire
Boat name: Cambrian Explorer
Make: Ribtec
Length: 6m +
Engine: 130hp honda outboard
Join Date: Oct 2005
Posts: 591
I don't know if this will help but i have a 75 4/ on mine and i have got a 19pitch. this gives me 5500 revs at full throttle.

__________________
Powerboat/PWC Instructor
Advance Commercial Skipper
Gregbutler08@aol.com
Lets go boating is offline   Reply With Quote
Old 26 September 2006, 15:13   #5
Member
 
Country: UK - England
Town: IoW
Make: HysuCat 6.5
Length: 6m +
Engine: 2 x Yamaha 70 2s
Join Date: Oct 2004
Posts: 71
hi guys, thanks for you input.


according to yamaha, the engine is not suposed to go higher than 5500 rpm.

althoug i like the idea of stainless i dont think its ideal for me as i launch/recover from a beach so dammage is enivitable i spose

Marther, what diameter prop are you using?

thanks
__________________
118118 is offline   Reply With Quote
Old 26 September 2006, 17:18   #6
Member
 
Lets go boating's Avatar
 
Country: UK - England
Town: Staffordshire
Boat name: Cambrian Explorer
Make: Ribtec
Length: 6m +
Engine: 130hp honda outboard
Join Date: Oct 2005
Posts: 591
Quote:
Originally Posted by 118118
hi guys, thanks for you input.


according to yamaha, the engine is not suposed to go higher than 5500 rpm.

althoug i like the idea of stainless i dont think its ideal for me as i launch/recover from a beach so dammage is enivitable i spose

Marther, what diameter prop are you using?

thanks
The diameter of the cone is 4.5''
Altogether including the blades diameter is 13''

Hope this will help.
__________________
Powerboat/PWC Instructor
Advance Commercial Skipper
Gregbutler08@aol.com
Lets go boating is offline   Reply With Quote
Old 26 September 2006, 17:22   #7
Member
 
Country: UK - England
Town: IoW
Make: HysuCat 6.5
Length: 6m +
Engine: 2 x Yamaha 70 2s
Join Date: Oct 2004
Posts: 71
ok, thanks,

i rhink i have a 13x 19 i can borrow, just seemed to me like it would be too big, but im gonna give it a go
thanks for your help
__________________

__________________
118118 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 21:12.


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