Like Tree0Likes

Prop BlowOut

Reply
Old 02-05-2008, 08:13 PM
  #1
Brotherhood #1
Gold Member
Thread Starter
Trade Score: (16)
 
Sick Stinger's Avatar
 
Join Date: Sep 2006
Location: Swansea Mass
My Boats: 33 Sutphen outrageous P3
Posts: 10,199
Default Prop BlowOut

I have a 1993 Velocity 26' that had a 509 SC/250 blower and a bravo1 with a 28P Hydromotive QIV prop.
When i hit plane and the boat layed down it would jump from 3k to 4200 when it hit plane. Id have to pull the htrottle back right away so the rpms would allow the prop to grab and get me going insteat of "pulling a burn out" just in the water. I did a bit of research, the new HotBoat said it had to do with a cavation plate, a couple threads said hull design and x dimention. My x is stock but drive has a nose cone.
Any and all help Appriciated.
-Mike
Sick Stinger is online now  
Reply With Quote
Old 02-05-2008, 08:23 PM
  #2
Registered
 
Join Date: Jul 2007
Location: Austin,Texas
Posts: 2,111
Default

Chances are your x is higher then stock. For modern boats to perform most have elevated x's from the factory. Any way many boats do what you are describing. It is ventilating and should go away moments after the boat levels out. I don't think the cavitation plate has much to do with it at that point. If it was slipping before the bow falls thats a completely different situation.
MOBILEMERCMAN is offline  
Reply With Quote
Old 02-05-2008, 08:29 PM
  #3
Brotherhood #1
Gold Member
Thread Starter
Trade Score: (16)
 
Sick Stinger's Avatar
 
Join Date: Sep 2006
Location: Swansea Mass
My Boats: 33 Sutphen outrageous P3
Posts: 10,199
Default

Mobile Its right when the boat lays down it doesnt go away though its stays up until i brink it down. The boat will stay on plan around 28 and up, Bu i feel like im loosin tons of speed if the prop is slipping that much. I ran a best of 81.7 with the 650hp 509c.i.. Now i have a 572 short deck with 10-71 blower producing 900 h.p. Im going to use a 34p bravo1 labbed. Im hoping to run a 6k top end.
Sick Stinger is online now  
Reply With Quote
Old 02-05-2008, 08:50 PM
  #4
Registered
 
Join Date: Jul 2006
Location: Virginia
My Boats: Velocity 280, Mako 172
Posts: 477
Default

Sick, make sure you start with a stock prop to get a good baseline. I like the bravo1s but had heard some people picking up speed with the hydromotives so I tried one that was two pitched sizes larger but had been labbed, couldn't get it to stop blowing out and actually lost speed. I don't think it was the prop, I think it was the lab job.
ThruHull is offline  
Reply With Quote
Old 02-05-2008, 09:32 PM
  #5
Brotherhood #1
Gold Member
Thread Starter
Trade Score: (16)
 
Sick Stinger's Avatar
 
Join Date: Sep 2006
Location: Swansea Mass
My Boats: 33 Sutphen outrageous P3
Posts: 10,199
Default

My hydro blew out like crazy i mean to the point in a 2ft. chop id loose pland and could not get back on it. It would blow out that easy. I need a prop/or fix that even in a chop i can throttle up and get back on top of the waves instead od puttering in like a 23 ft. bayliner in a ripple chop.
-Mike
Sick Stinger is online now  
Reply With Quote
Old 02-05-2008, 09:48 PM
  #6
Registered
 
Join Date: Jul 2006
Location: Virginia
My Boats: Velocity 280, Mako 172
Posts: 477
Default

was that the hydro that came on the boat?
ThruHull is offline  
Reply With Quote
Old 02-06-2008, 06:33 AM
  #7
Brotherhood #1
Gold Member
Thread Starter
Trade Score: (16)
 
Sick Stinger's Avatar
 
Join Date: Sep 2006
Location: Swansea Mass
My Boats: 33 Sutphen outrageous P3
Posts: 10,199
Default

Thru yes that is the one that was on the boat when i bought it.
Sick Stinger is online now  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
bulletbob
Velocity
37
02-13-2008 07:09 AM
tpmarine.com
New Products and Member Discounts
6
12-28-2007 01:17 PM
PowerboatsNW
Eliminator
0
07-13-2006 01:02 PM
force 320
General Q & A
18
01-24-2004 08:41 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 06:18 PM.


Copyright 2011 OffShoreOnly. All rights reserved.