Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 17-02-2009, 08:06   #1
Registered User

Join Date: Jan 2008
Location: Nova Scotia, Canada
Boat: Seafarer 30 Impetuous
Posts: 426
Images: 45
Can a machine / propeller shop "turn down" a 3 blade 15" feathering prop to be 14"

Can a machine / propeller shop "turn down" a 3 blade 15" feathering prop, to be 14", by cutting a bit off the ends? Of course, anyone can cut the ends off, but I mean, will the prop still work well. It is adjustable pitch!
__________________

__________________
Northeaster is offline   Reply With Quote
Old 17-02-2009, 09:13   #2
Senior Cruiser
 
sandy daugherty's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: near Annapolis
Boat: PDQ 36 & Atlantic 42
Posts: 1,178
Sell it, and buy the right size. The idea is something like cutting your toes off to fit a nice pair of shoes! A propeller blade is a lovely peice of engineering, and every part of the shape is a compromise to achieve the best thrust at the lowest disturbance of the water, which wastes power. Tip design is particularly fussy, because its the part that does the most to minimize disturbance.
__________________

__________________
sandy daugherty is offline   Reply With Quote
Old 17-02-2009, 10:44   #3
Registered User

Join Date: Feb 2007
Location: Prince Rupert
Boat: samson c-mist 32
Posts: 98
Images: 5
A good marine experienced Machine shop can re-build, re-pitch, resurface props with no problem. They do it all the time here, and they do a great job.
__________________
emeraldsea is offline   Reply With Quote
Old 17-02-2009, 10:50   #4
Moderator Emeritus
 
David M's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: San Francisco Bay
Boat: research vessel
Posts: 10,150
There are businesses that specialize in propeller repair. Go only to one of these places. A general machine shop will in all likelihood not know what they are doing. Propeller repair is very specialized. Its probably easier for a propeller shop to reduce the pitch one inch or so than to reduce the diameter of the wheel.

As sandy said, I would price out the cost of a new or used propeller versus the cost of having the propellers pitch altered.
__________________
David

Life begins where land ends.
David M is offline   Reply With Quote
Old 17-02-2009, 11:36   #5
Senior Cruiser
 
Jim Cate's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 11,447
The original post stipulated that it is an adjustable pitch prop (as many feathering props are). This leads me to ask why is it necessary to reduce the diameter? Seems that simply reducing the pitch would get the job done...

Unless, of course, it is a matter of tip clearance!

Still, a prop shop should be able to do the mecessary size reduction... feathering props, having no twist in the blades, should be relatively easy to change without affecting their (already compromised) efficiency.

Cheers,

Jim and Ann s/.v Insatiable II
__________________
Jim Cate is online now   Reply With Quote
Old 17-02-2009, 16:54   #6
Registered User

Join Date: Jan 2008
Location: Nova Scotia, Canada
Boat: Seafarer 30 Impetuous
Posts: 426
Images: 45
thanks for all of the replies! Yes, it was a matter of tip clearance. I have a 15" prop on now, and am already at the limit. I thought I had a great deal on a 16" prop, so I thought I would ask the question. Turns out the shaft diameter size was too big on the prop as well, so I will have to look for another deal.

Thanks again!!
__________________
Northeaster is offline   Reply With Quote
Old 17-02-2009, 19:15   #7
Eternal Member
 
Chief Engineer's Avatar

Join Date: Aug 2006
Location: North of Baltimore
Boat: Ericson 27 & 18' Herrmann Catboat
Posts: 3,798
If you are near the Chesapeake...Millers Island Propeller, Sparrows Point, Maryland has been in business for years...If anybody could do it, they could.
__________________
Chief Engineer is offline   Reply With Quote
Old 18-03-2009, 11:40   #8
Registered User

Join Date: Mar 2009
Posts: 2
Post 14 in feathering prop (Autostream Seahawk)

Quote:
Originally Posted by Northeaster View Post
Can a machine / propeller shop "turn down" a 3 blade 15" feathering prop, to be 14", by cutting a bit off the ends? Of course, anyone can cut the ends off, but I mean, will the prop still work well. It is adjustable pitch!
Northeaster: I have a 14 in prop (Autostream SeaHawk S1) that was shaved down from 15 in to 14 in (professionally done) and I need to sell it as does not fit my boat...prop is enroute back from Martec at present.
NONSUCHG
__________________
nonsuchg is offline   Reply With Quote
Old 22-03-2009, 16:24   #9
Registered User

Join Date: Jan 2008
Location: Nova Scotia, Canada
Boat: Seafarer 30 Impetuous
Posts: 426
Images: 45
Nonsuch = I would be interested in hearing more details!! I am not familiar with the model. Is it self-pitching, or adjustable pitch?
__________________
Northeaster is offline   Reply With Quote
Old 22-03-2009, 16:28   #10
Registered User

Join Date: Jan 2008
Location: Nova Scotia, Canada
Boat: Seafarer 30 Impetuous
Posts: 426
Images: 45
Nonsuch - just checked out there website. Curious as to why it didn't fit your boat, after having shaved it down!

Would like to know age, price, other details, etc.

Thanks!
__________________
Northeaster is offline   Reply With Quote
Old 23-03-2009, 10:17   #11
Registered User

Join Date: Mar 2009
Posts: 2
Seahawk prop-info for Northeaster

Northeaster: not familiar with this site yet so hoping this will get to you:
(also sent mail just to you)

The prop is all stainless steel; fully adjustable pitch for both forward and reverse (can be set while in water): prop came off a Beneteau 311 with 18 HP Yanmar 2Gm20F engine; 25 mm shaft diameter (Gear ratio 2.6.2). Prop is in excellent condition (like new...no pitting/corrosion)...I paid $600 and wanted to put it on my boat...but have an SAE 1 in diameter shaft...sent it to Martec for estimate of cost of conversion from 25 mm shaft to 1 in and they recommended a 15 in (possible) or 16 in (best) diameter prop for my boat. Too expensive to switch the blades out however so now on way back to me from them (they did not do any service to the prop but upon visual inspection indicated it appears to be in excellent working condition...bearings etc) and only quoted me on switching blades and conversion to fit a 1 in shaft.
__________________

__________________
nonsuchg is offline   Reply With Quote
Reply

Tags
3 blade

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sir Peter Blake's "Seamaster," Now "Tara," Still Hard at Work TaoJones Monohull Sailboats 5 15-12-2009 15:40
"recent price reduction""owner anxious""bring all offers" sailorboy1 Dollars & Cents 10 22-01-2009 12:25
14" x 9.5" bronze 3-blade propeller colemj Classifieds Archive 0 27-05-2008 11:07
WANTED: MAXPROP 20", three blade feathering avazquez Classifieds Archive 4 29-10-2007 10:42



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 17:13.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.