Like Tree0Likes

Herring 5-blade Bravo Props

Reply
Old 09-05-2002, 01:22 PM
  #1
Goody76
Guest
 
Posts: n/a
Default Herring 5-blade Bravo Props

Has anyone used with a positive gain as far as speed, handling and lower slip than four-blade. I have a single cat with prop in the tunnel turnning a 4-blade merc that seems to be slipping at 22-24% which is much to high.
 
Reply With Quote
Old 09-05-2002, 02:24 PM
  #2
Registered
Platinum Member
 
Join Date: Jan 2001
Location: PA and MD
My Boats: fuel injection, superchargers
Posts: 1,449
Default

I would try to fix your boat first rather than try a 5 blade. What hull, drive, engine, X or propshaft to bottom of sponsons, center pod, weight? What props have you tried?
cobra marty is offline  
Reply With Quote
Old 09-05-2002, 03:11 PM
  #3
Thunder Roy
Guest
 
Posts: n/a
Default

I HAVE A PAIR OF 28 PITCH HERRINGS FOR SALE
 
Reply With Quote
Old 09-05-2002, 04:11 PM
  #4
OSO Moderator
Charter Member
 
BillR's Avatar
 
Join Date: Oct 2000
Location: Virginia Beach, VA
My Boats: '00 Scarab Sport 302 CC
Posts: 3,580
Default

I'm game; how much?
__________________
BillR

'00 Scarab Sport 302 CC
'02 Cigarette Top Gun TS
'02 PQ 340
'00 PQ 280
'98 Scarab 22
'97 Baja Outlaw 20
'72 Checkmate
'65 Glastron
BillR is offline  
Reply With Quote
Old 09-05-2002, 06:39 PM
  #5
Goody76
Guest
 
Posts: n/a
Default

cobra marty- The hull is a 28 profile cat with a center pod stepped bottom. The drive is a 1.50 imco xr with a standard imco lower. The bullet of the nose cone sits about 4 inches lower than the center pod. The engine is a whippled 500hp/efi. Boat weight is about 4650lbs. I am currently running a labbed 34 four blade merc bravo1 spinning it up to 5600 and running 98mph. Beginning of the season I was spinning this prop @ 5400, 1.50 gears and was seeing 106 gps.
 
Reply With Quote
Old 09-05-2002, 07:15 PM
  #6
The Senior Charter Member #1070
Charter Member
 
Tbonepmp's Avatar
 
Join Date: Feb 2001
Location: STL / LOTO
Posts: 2,083
Arrow THUNDERROY...

Quote:
Originally posted by Thunder Roy
I HAVE A PAIR OF 28 PITCH HERRINGS FOR SALE
HHHHMMMMmmmm HOW MUCH?????
__________________
(What you see, is what you get!)
"Live every day to it's fullest for you give a day of your life to it."
Tbonepmp is offline  
Reply With Quote
Old 09-05-2002, 07:42 PM
  #7
Thunder Roy
Guest
 
Posts: n/a
Default

2000.00 FOR THE PAIR. THEY ARE FOR BRAVO ONE SMALL SHAFT
 
Reply With Quote
Old 09-05-2002, 08:23 PM
  #8
Platinum Member
Platinum Member
 
Tinkerer's Avatar
 
Join Date: Jan 2002
Location: ALTO, MI
My Boats: 2001 Daytona 26, 1992 SCARAB 34, 1989 25 Checkmate Convincer, 1977 Glastron Carlson CVX 18
Posts: 4,144
Default

If you know someone with a 1:36 ( I think that is the ratio ) or lower ratio drive I would try it with a lower pitch prop and spin the prop faster with the same engine RPM.
Tinkerer is offline  
Reply With Quote
Old 09-05-2002, 10:58 PM
  #9
Registered
Platinum Member
 
Join Date: Jan 2001
Location: PA and MD
My Boats: fuel injection, superchargers
Posts: 1,449
Default

Interesting. What changed between the two runs? Fuel load, passengers, anchor, beer chest? Is the prop nicked or bent? By labbing it the ears are thinner and easier to bend. The bend in pitch might not be visible to the eye. Do you boat on water with a current? A 2-4 mph current will make a difference like you describe. I would try a box stock 34" and start again. I am surprised at the speed with 700hp and that hull with a center pod. I didn't think that the Profile was that fast. Your X sounds pretty low, do you have access to a 2" shorter lower unit? I don't know if a 5 blade will help you.
cobra marty is offline  
Reply With Quote
Old 09-06-2002, 04:51 PM
  #10
Goody76
Guest
 
Posts: n/a
Default

Cobra marty- I am going to try a 2 inch shortie on the lower and was going to try a 5-blade since I am raising the prop higher to the surface to get more blade area in the water for getting on plane and for stability at higher speeds. I talked with Bob's son Jim @ Herring and sounded very confident about making a prop for me that would only slip 6-8% and that if they didn't get it right the first time that they would have no problem in trying until I was satisfied. On my current 34 that I sent out to Dennis Cavanaugh @ Merc. to lab I did hit a piece of wood at high speed in the bay one night and put a slight fold the size of a nickle in one of the ears. I brought it to a local prop guy to fix so I would be out in time for the weekend and I am starting to think this is where I went wrong. Not being a Merc prop guy he did what he did to it not thinking in terms of it being a high performance application, possibly taking out some cup or altering the balance of it!
 
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
lucky strike
General Boating Discussion
5
04-09-2005 09:45 AM
timucin
General Boating Discussion
0
06-30-2003 04:52 PM
John B
General Q & A
9
07-27-2002 11:59 PM
stevejohns
General Q & A
4
07-09-2002 12:01 PM



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 On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 01:09 AM.


Copyright 2011 OffShoreOnly. All rights reserved.