Reply
 
Thread Tools Search this Thread Display Modes
 
Old 05-28-2013, 02:10 PM   #1
Moderator Emeritus
 
dwhatty's Avatar
 
City: Home Port: Buck's Harbor, Maine
Vessel Name: "Emily Anne"
Vessel Model: 2001 Island Gypsy 32 Europa (Hull #146)
Join Date: Sep 2008
Posts: 2,846
Propeller Cage

Just finished installing one on our boat so we have to worry less about pot buoys. Had it made up locally of SS. For those of you who have never seen one, here's some photos. Hope it works out okay. Just have to remember not to back into a line or hit it with a log.
Attached Thumbnails
IMG_0221.JPG   IMG_0222.JPG   IMG_0223.JPG   IMG_0224.JPG   IMG_0225.JPG  

__________________
David Hawkins
Deer Isle, Maine
dwhatty is offline   Reply With Quote
Old 05-28-2013, 02:21 PM   #2
TF Site Team
 
FlyWright's Avatar
 
City: California Delta
Vessel Name: FlyWright
Vessel Model: 1977 Marshall Californian 34 LRC
Join Date: Apr 2008
Posts: 13,728
I like it!
__________________
My boat is my ark. It's my mobile treehouse and my floating fishing cabin. It's my retreat and my respite. Everyday I thank God I have a boat! -Al FJB

@DeltaBridges - 25 Delta Bridges in 25 Days
FlyWright is offline   Reply With Quote
Old 05-28-2013, 02:30 PM   #3
Master and Commander
 
markpierce's Avatar
 
City: Vallejo CA
Vessel Name: Carquinez Coot
Vessel Model: penultimate Seahorse Marine Coot hull #6
Join Date: Sep 2010
Posts: 12,559
Do you have any concerns about rust if operating in salt water?

Electrolysis?: Will you be adding more zincs?

Will you need to remove the rudder to gain access to the propeller for its possible removal?
__________________
Kar-KEEN-ez Koot
markpierce is offline   Reply With Quote
Old 05-28-2013, 04:13 PM   #4
TF Site Team
 
Larry M's Avatar
 
City: Jacksonville
Join Date: Nov 2008
Posts: 11,681
Quote:
Originally Posted by dwhatty View Post
Just finished installing one on our boat so we have to worry less about pot buoys. Had it made up locally of SS. For those of you who have never seen one, here's some photos. Hope it works out okay. Just have to remember not to back into a line or hit it with a log.
Looks great! Good design. How is the upper tab just forward of the rudder attached? And the bolts at the keel, thru bolted? Any surprises during the installation?

No more wrapped lines that's for sure. Please give us a report after some time in the water.
Larry M is online now   Reply With Quote
Old 05-28-2013, 04:50 PM   #5
Moderator Emeritus
 
dwhatty's Avatar
 
City: Home Port: Buck's Harbor, Maine
Vessel Name: "Emily Anne"
Vessel Model: 2001 Island Gypsy 32 Europa (Hull #146)
Join Date: Sep 2008
Posts: 2,846
Quote:
Originally Posted by markpierce View Post
Do you have any concerns about rust if operating in salt water?

Electrolysis?: Will you be adding more zincs?

Will you need to remove the rudder to gain access to the propeller for its possible removal?
Mark:

Not concerned about rust. If in a few years it starts to get badly corroded, we'll have another made. This was not that expensive, especially relative to other boating costs.

Most of the fisherman do not add extra zincs or connect the cage to the bonding system (if they even have one).

Will see what it all looks like, including our usual zincs, when we haul the boat in 5 months or so and see if the zinc/bonding question needs to be re-visited.

It looks like I could just get the prop off and out of the cage w/o interference by the rudder. If I can't, I will just take one side or both sides of the cage off (it is made up of two pieces port and starboard) and the whole kit and kaboodle is designed to be removable.

I drilled and tapped the fiberglass of the keel for three 1/2"-20 bolts for the forward edges (on both port and starboard) of the cage. The glass was about 1 1/8" to 1 1/4" thick. The bolts tightened up nice and snug, but if they show any signs of not holding, will go to Plan B of through bolting using threaded rod (after we raise the boat from the bottom).

The aft end of the cage at the top of the hoop is bolted to a "T" fitting, which fitting in turn is through bolted with two 3/8-24 bolts up into the Lazarette and through a backing plate. The lower aft end of the cage is also fastened with a 1/2"-20 bolts on each side of the aft end of the skeg first into glass and then into about 1/2" of bronze that was inside the skeg. Am very confident in the aft end fastenings.

All holes and fastenings were well and thoroughly gooped with 3M 4200 (not 5200 thank you).

Two more photos showing the two pieces that make up the cage:
Attached Thumbnails
IMG_0213.JPG   IMG_0214.JPG  
__________________
David Hawkins
Deer Isle, Maine
dwhatty is offline   Reply With Quote
Old 05-28-2013, 06:21 PM   #6
Guru
 
Sailor of Fortune's Avatar
 
City: St Augustine,Fl
Join Date: Sep 2009
Posts: 3,796
These prop cages are well regarded and a common add on in New England. They are common on Lobster Boats and a great addition to Non high speed yachts.
Sailor of Fortune is offline   Reply With Quote
Old 05-28-2013, 06:33 PM   #7
Guru
 
SCOTTEDAVIS's Avatar
 
City: Vero Beach, FL.
Vessel Name: FIREFLY
Vessel Model: Pilgrim 40
Join Date: Nov 2012
Posts: 918
I not only like it, but it would fit on Firefly just fine.

hmmmmm
SCOTTEDAVIS is offline   Reply With Quote
Old 05-28-2013, 06:52 PM   #8
Guru
 
Sailor of Fortune's Avatar
 
City: St Augustine,Fl
Join Date: Sep 2009
Posts: 3,796
Firefly
Are you moored at Grand Harbor?
Sailor of Fortune is offline   Reply With Quote
Old 05-28-2013, 08:34 PM   #9
Guru
 
Codger2's Avatar
 
City: San Diego
Vessel Name: Circuit Breaker
Vessel Model: 2021..22' Duffy Cuddy cabin
Join Date: Oct 2007
Posts: 6,691
Quote:
Originally Posted by dwhatty View Post
Just finished installing one on our boat so we have to worry less about pot buoys.
WOW! can't wait to find out how it works, Dave! Are you in the water yet?
__________________
Done with diesel power boats! Have fallen in love with all electric!
Codger2 is offline   Reply With Quote
Old 05-29-2013, 12:30 AM   #10
Hospitality Officer
 
Andy G's Avatar
 
City: Pittwater
Vessel Name: Sarawana
Vessel Model: IG 36 Quad Cabin
Join Date: Sep 2010
Posts: 1,897
At the risk of starting WW3, another potential benefit of a single screw boat?
Andy G is offline   Reply With Quote
Old 05-29-2013, 12:49 AM   #11
TF Site Team
 
City: Ex-Brisbane, (Australia), now Bribie Island, Qld
Vessel Name: Now boatless - sold 6/2018
Vessel Model: Had a Clipper (CHB) 34
Join Date: Jun 2008
Posts: 10,101
Andy...YOU CUT THAT OUT YOU NAUGHTY MAN...!
__________________
Pete
Peter B is offline   Reply With Quote
Old 05-29-2013, 07:07 AM   #12
Guru
 
SCOTTEDAVIS's Avatar
 
City: Vero Beach, FL.
Vessel Name: FIREFLY
Vessel Model: Pilgrim 40
Join Date: Nov 2012
Posts: 918
Quote:
Originally Posted by Sailor of Fortune View Post
Firefly
Are you moored at Grand Harbor?

Yes
SCOTTEDAVIS is offline   Reply With Quote
Old 05-29-2013, 07:34 AM   #13
Guru
 
Sailor of Fortune's Avatar
 
City: St Augustine,Fl
Join Date: Sep 2009
Posts: 3,796
I saw your boat last fall. I delivered the Bertram 36 "Sweet Lelani" for my friend Steve. He has been at Grand Harbor Marina since Oct. He has a condo there, but lives in Philadelphia.
Sailor of Fortune is offline   Reply With Quote
Old 05-29-2013, 08:14 AM   #14
Guru
 
Nick14's Avatar
 
City: New England
Vessel Name: Culmination
Vessel Model: Helmsman 38 Sedan
Join Date: May 2013
Posts: 719
A prop cage seems like a great idea and would be very helpful here on the Chesapeake where there are crab pots everywhere. Though the fishermen are not supposed to put them in many places, they routinely fill up navigational channels, entrances to harbors and marinas, wherever they think there might be a crab.

Does anyone have any experience with a cage regarding impact on speed? I imagine there would be a negligible impact on the performance of a full-displacement boat. Endurance is a semi-displacement design with a top speed of about 20 kts and a cruise of about 16-17 kts - I wonder what kind of impact a cage would have on that?
__________________
Nick
Nick14 is offline   Reply With Quote
Old 05-29-2013, 11:45 AM   #15
Guru
 
Daddyo's Avatar
 
City: Cruising East Coast US
Vessel Name: Grace
Vessel Model: DeFever 48
Join Date: Apr 2008
Posts: 2,420
Can't be too bad as the lobstermen run those speeds and often have cages.
__________________
Cruiser
Esse Quam Videri
Daddyo is offline   Reply With Quote
Old 05-29-2013, 12:55 PM   #16
Senior Member
 
Captain K's Avatar
 
City: Foley, Alabama
Vessel Name: GITANA
Vessel Model: Sea Ranger 47 Pilothouse
Join Date: Mar 2012
Posts: 315
One suggested change to consider on your next iteration of this excellent cage: Make the aft sides of the cage solid as they encircle the prop, thus creating a "duct" effect. I've seen those on large commercial vessels where they are said to offer a significant increase in propeller efficiency.
Captain K is offline   Reply With Quote
Old 05-29-2013, 01:11 PM   #17
Art
Guru
 
Art's Avatar
 
City: SF Bay Area
Vessel Model: Tollycraft 34' Tri Cabin
Join Date: Feb 2011
Posts: 12,569
David – Your SS two part prop-cage looks great and I feel your keel fastening system will last you well.

I've thought of cages on twin screw but very afraid to through-bolt into hull-bottom. Because... on our twin the cages would take the brunt of a grounding or deadhead collision... unlike yours having a skeged keel to greatly defer impact and also take the stress from fasteners. That is another good reason to like single screw boats! That said - For reasons, I'm still partial to twins!

1970... “Main Coast Shipbuilders”, Rockland/Owls Head (I then worked there at 18 yrs of age) had multi boat contract with Audubon Society for duplicate 31’ers. Each was being fitted with prop cage as Audubon planned to take their boats into real shallow waters (i.e. bird territory). These cages were through-bolted to the hull’s bottom (which I thought was risky at best if a deadhead was hit at speed or severe grounding occurred at speed). I heard the cages were no detriment to the speed of these fairly quick boats.

Main Coast Shipbuilders never did build all that were ordered due to its going broke as well as some real seamy business BS that its founder(s) pulled off. In my opinion that builder cut more corners in build-outs than a pizza maker shredding cheese! The two foremen reminded me of mafia types, big bad ******** providing shuck and jive!! My dad had been lead Purchasing Agent for that company and would tell me horror stories, he finally quit! Working there for a while I saw some real bad builds that were let fly! Dad and I knew the head guy from “Lang’s Boat Sales” and other boat yards in LI, NY. At about 15 yrs of age I was sitting in his LI office as this guy offered that (then future) job-position to dad... when we left – I said... dad, be careful, don’t trust him, that guy is a crook! In the long run I was proven correct!! He eventually (and suddenly) gutted Main Coast Shipbuilders of everything... then, from what I learned, he secretively fled to Canada.
Art is offline   Reply With Quote
Old 05-29-2013, 01:18 PM   #18
Guru
 
SCOTTEDAVIS's Avatar
 
City: Vero Beach, FL.
Vessel Name: FIREFLY
Vessel Model: Pilgrim 40
Join Date: Nov 2012
Posts: 918
Quote:
Originally Posted by Sailor of Fortune View Post
I saw your boat last fall. I delivered the Bertram 36 "Sweet Lelani" for my friend Steve. He has been at Grand Harbor Marina since Oct. He has a condo there, but lives in Philadelphia.

That Bertram is a nice boat, I aim to miss it each time I return to my slip.
SCOTTEDAVIS is offline   Reply With Quote
Old 05-29-2013, 01:52 PM   #19
Moderator Emeritus
 
dwhatty's Avatar
 
City: Home Port: Buck's Harbor, Maine
Vessel Name: "Emily Anne"
Vessel Model: 2001 Island Gypsy 32 Europa (Hull #146)
Join Date: Sep 2008
Posts: 2,846
Quote:
Originally Posted by Daddyo View Post
Can't be too bad as the lobstermen run those speeds and often have cages.

A knot or two for the fast boys is what I hear. Also, some that run that fast take an inch out of (or was it add an inch to) their prop pitch when they install a cage. I was told that at my speed (ha!) I needn't worry about that.
__________________
David Hawkins
Deer Isle, Maine
dwhatty is offline   Reply With Quote
Old 05-29-2013, 01:53 PM   #20
Moderator Emeritus
 
dwhatty's Avatar
 
City: Home Port: Buck's Harbor, Maine
Vessel Name: "Emily Anne"
Vessel Model: 2001 Island Gypsy 32 Europa (Hull #146)
Join Date: Sep 2008
Posts: 2,846
Quote:
Originally Posted by SeaHorse II View Post
Dave! Are you in the water yet?

#@%*&#*@
__________________
David Hawkins
Deer Isle, Maine
dwhatty is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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


» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 08:06 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012