Reply
 
Thread Tools Search this Thread
 
Old 23 November 2010, 14:39   #1
Member
 
Country: USA
Town: Rhode Island
Make: avon
Length: 6m +
Engine: 90hp merc
Join Date: Mar 2006
Posts: 296
set back plate for sr 4.0

hello, i was thinking of adding a set back plate on my sr 4.0. wondering if anyone has ever used this set up, pros and cons of it, im looking to get a bit more speed out of my boat without it porpousing around 39 mph. Im running a 50 hp 2 stroke mercury, Ive had the boat up to 43 but looking to smooth out the ride? thanks
__________________

__________________
learning to fly is offline   Reply With Quote
Old 23 November 2010, 15:49   #2
Member
 
cgoing's Avatar
 
Country: USA
Town: Connecticut
Make: Zodiac
Length: 6m +
Engine: Undecided
Join Date: Nov 2009
Posts: 572
porposing

By the sounds of things i am guessing it gets a bit hairy near the top end. You might consider going with a set of trim tabs which should smooth out the ride. I've got an Avon Adventure 400 with a 40 Yammy and they did the trick on my boat. Isued the composite style Smart tbas and they worked great.
__________________

__________________
cgoing is offline   Reply With Quote
Old 23 November 2010, 18:49   #3
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
Try sticking a fuel tank in the bow. It solved it for me when I had the SR4 with exactly the same chinewalking issues at 37-39mph.
__________________
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 23 November 2010, 18:54   #4
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
Quote:
Originally Posted by Nos4r2 View Post
37-39mph.
Probably fast enough in an SR4
__________________
Downhilldai is offline   Reply With Quote
Old 23 November 2010, 19:09   #5
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
Quote:
Originally Posted by Downhilldai View Post
Probably fast enough in an SR4
Nah...

I saw 39 knots with 40 litres of fuel aboard plus an aux in mine. It would go faster but I started to foam at the mouth...
__________________
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 23 November 2010, 20:22   #6
Member
 
Country: USA
Town: Rhode Island
Make: avon
Length: 6m +
Engine: 90hp merc
Join Date: Mar 2006
Posts: 296
I was thinking of also lifting the motor a inch or two. boat is everything i want but like I said I have started to porpose before I even start to chine walk, The boat will start to porpouse at about 39mph, I can get it up a bit faster but I am just looking to squeeze every last mph I can possibly get. I have had it at 43mph which is what I believe the hull is rated for top speed. I would just love to top that though. Will I ever be able to surpass a hulls top speep without the chinwalking and porposing? Also I have used the smart tabs on my avon 5.4 and while they do everything advertised, faster planeing, smoother ride and better control in corners it seems to tame the boat a bit. I love the wildness of how the boat feels without the tabs.
__________________
learning to fly is offline   Reply With Quote
Old 24 November 2010, 12:55   #7
Member
 
Country: Canada
Join Date: Jan 2003
Posts: 15
Quote:
Originally Posted by learning to fly View Post
I have started to porpose before I even start to chine walk, The boat will start to porpouse at about 39mph, I can get it up a bit faster but I am just looking to squeeze every last mph I can possibly get....Will I ever be able to surpass a hulls top speep without the chinwalking and porposing?
check out these threads on chinewalk and porpoising.
__________________

Jimboat 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 22:47.


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