Classic SeaCraft Community  

Go Back   Classic SeaCraft Community > General Discussion > General
FAQ Community Calendar Today's Posts Search

Notices

Reply
 
Thread Tools Search this Thread Display Modes
  #11  
Old 05-27-2009, 11:19 AM
thedog thedog is offline
Member
 
Join Date: May 2009
Posts: 78
Default Re: new member, wanting to compare performance 23c

thanks for the replies
what makes a stern lifting prop different than a regular three blade
I assume it creates some lift, but how does it do it?
different blade configuration?
Reply With Quote
  #12  
Old 05-31-2009, 03:29 PM
gss036 gss036 is offline
Senior Member
 
Join Date: Jul 2003
Location: Bellingham, Washington
Posts: 260
Default Re: new member, wanting to compare performance 23c

I guess it lifts the stern of the boat because that is what it did for me after I installed a 225 Honda which was much heavier than the old Merc 200 2 stroke. FrankFrank is the prop guru here , seach for his posts.
__________________
Gary
Reply With Quote
  #13  
Old 07-10-2009, 04:46 PM
Bigshrimpin Bigshrimpin is offline
Senior Member
 
Join Date: Dec 2002
Location: Onset, MA
Posts: 2,712
Default Re: new member, wanting to compare performance 23c

I know all the bow lifters are higher rake props. I believe Low rake props provide more sternlift . . .
Reply With Quote
  #14  
Old 07-10-2009, 07:25 PM
Blue_Heron Blue_Heron is offline
Senior Member
 
Join Date: Jan 2006
Location: Gator Country
Posts: 1,416
Default Re: new member, wanting to compare performance 23c

Mercury has a very good primer on prop technology here:

Prop Technology

As has been mentioned above, Fr. Frank is the resident X-purt. The Merc site will help you understand some of what he says about props.
Dave
__________________
Blue Heron Boat Works
Reinventing the wheel, one spoke at a time.
Reply With Quote
  #15  
Old 07-10-2009, 10:03 PM
Fr. Frank Fr. Frank is offline
Senior Member
 
Join Date: Oct 2003
Location: Shalimar, Florida
Posts: 2,265
Default Re: new member, wanting to compare performance 23c

Quote:
I know all the bow lifters are higher rake props. I believe Low rake props provide more sternlift . . .
Tim is right on here.

High continuous rake props provide lots of bow lift. Low continuous rake and Progressive rakes props tend to provide more stern lift. Generally speaking, 4 blades also provide much more sternlift than 3 blades.
In general, one of the rules is that the greater the proportion of forward thrust created near the point of rotation, which is the hub of the prop, the greater the stern lift.

Of course there are a great many other factors which affect all of this, which is why there is no substitute for putting a prop on and giving it a try. The experiences of so many members here on CSC who have tried so many different props is a great resource.
__________________
Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.

Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!

Currently without a SeaCraft
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
Reply With Quote
Reply


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

Forum Jump


All times are GMT -4. The time now is 11:55 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
All original content © 2003-2013 ClassicSeacraft