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05-28-2013, 02:10 PM
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#1
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Moderator Emeritus
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
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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.
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David Hawkins
Deer Isle, Maine
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05-28-2013, 02:21 PM
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#2
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TF Site Team
City: California Delta
Vessel Name: FlyWright
Vessel Model: 1977 Marshall Californian 34 LRC
Join Date: Apr 2008
Posts: 13,728
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I like it!
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05-28-2013, 02:30 PM
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#3
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Master and Commander
City: Vallejo CA
Vessel Name: Carquinez Coot
Vessel Model: penultimate Seahorse Marine Coot hull #6
Join Date: Sep 2010
Posts: 12,559
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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?
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Kar-KEEN-ez Koot
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05-28-2013, 04:13 PM
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#4
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TF Site Team
City: Jacksonville
Join Date: Nov 2008
Posts: 11,681
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Quote:
Originally Posted by dwhatty
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.
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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.
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05-28-2013, 04:50 PM
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#5
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Moderator Emeritus
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
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Quote:
Originally Posted by markpierce
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?
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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:
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David Hawkins
Deer Isle, Maine
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05-28-2013, 06:21 PM
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#6
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Guru
City: St Augustine,Fl
Join Date: Sep 2009
Posts: 3,796
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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.
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05-28-2013, 06:33 PM
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#7
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Guru
City: Vero Beach, FL.
Vessel Name: FIREFLY
Vessel Model: Pilgrim 40
Join Date: Nov 2012
Posts: 918
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I not only like it, but it would fit on Firefly just fine.
hmmmmm
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05-28-2013, 06:52 PM
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#8
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Guru
City: St Augustine,Fl
Join Date: Sep 2009
Posts: 3,796
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Firefly
Are you moored at Grand Harbor?
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05-28-2013, 08:34 PM
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#9
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Guru
City: San Diego
Vessel Name: Circuit Breaker
Vessel Model: 2021..22' Duffy Cuddy cabin
Join Date: Oct 2007
Posts: 6,691
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Quote:
Originally Posted by dwhatty
Just finished installing one on our boat so we have to worry less about pot buoys.
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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!
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05-29-2013, 12:30 AM
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#10
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Hospitality Officer
City: Pittwater
Vessel Name: Sarawana
Vessel Model: IG 36 Quad Cabin
Join Date: Sep 2010
Posts: 1,897
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At the risk of starting WW3, another potential benefit of a single screw boat?
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05-29-2013, 12:49 AM
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#11
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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
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Andy...YOU CUT THAT OUT YOU NAUGHTY MAN...!
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Pete
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05-29-2013, 07:07 AM
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#12
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Guru
City: Vero Beach, FL.
Vessel Name: FIREFLY
Vessel Model: Pilgrim 40
Join Date: Nov 2012
Posts: 918
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Quote:
Originally Posted by Sailor of Fortune
Firefly
Are you moored at Grand Harbor?
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Yes
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05-29-2013, 07:34 AM
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#13
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Guru
City: St Augustine,Fl
Join Date: Sep 2009
Posts: 3,796
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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.
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05-29-2013, 08:14 AM
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#14
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Guru
City: New England
Vessel Name: Culmination
Vessel Model: Helmsman 38 Sedan
Join Date: May 2013
Posts: 719
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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?
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Nick
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05-29-2013, 11:45 AM
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#15
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Guru
City: Cruising East Coast US
Vessel Name: Grace
Vessel Model: DeFever 48
Join Date: Apr 2008
Posts: 2,420
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Can't be too bad as the lobstermen run those speeds and often have cages.
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Cruiser
Esse Quam Videri
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05-29-2013, 12:55 PM
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#16
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Senior Member
City: Foley, Alabama
Vessel Name: GITANA
Vessel Model: Sea Ranger 47 Pilothouse
Join Date: Mar 2012
Posts: 315
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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.
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05-29-2013, 01:11 PM
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#17
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Guru
City: SF Bay Area
Vessel Model: Tollycraft 34' Tri Cabin
Join Date: Feb 2011
Posts: 12,569
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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.
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05-29-2013, 01:18 PM
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#18
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Guru
City: Vero Beach, FL.
Vessel Name: FIREFLY
Vessel Model: Pilgrim 40
Join Date: Nov 2012
Posts: 918
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Quote:
Originally Posted by Sailor of Fortune
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.
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That Bertram is a nice boat, I aim to miss it each time I return to my slip.
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05-29-2013, 01:52 PM
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#19
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Moderator Emeritus
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
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Quote:
Originally Posted by Daddyo
Can't be too bad as the lobstermen run those speeds and often have cages.
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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
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05-29-2013, 01:53 PM
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#20
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Moderator Emeritus
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
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Quote:
Originally Posted by SeaHorse II
Dave! Are you in the water yet?
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#@%*&#*@
__________________
David Hawkins
Deer Isle, Maine
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