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Catalina 310 wing keel draft?

Discussion in 'Catalina 310' started by Lisa, Oct 12, 2017 at 4:45 AM. Add this thread to a FAQ

  1. Lisa

    Lisa

    Joined Thursday
    6 posts, 4 likes
    Catalina 310
    US Middle River, Maryland Middle River, Md
    Ready to purchase a Catalina 310 wing keel. We prefer a shallower draft boat, so that was a draw with this boat because it's listed at 4'4". Although Catalina brochure states 4'. Then I started searching the web - and found a forum with several 310 owners listing that they've run aground, then found it actually drafts 4'10". Several owners came up with this measurement. My question is this. Anyone else finding that their 310's have a draft closer to 5'?
    Thank you for your time
     


    Alansails likes this.
  2. Cat 310 #1 in GA

    Cat 310 #1 in GA

    Joined Jan 17, 2013
    196 posts, 16 likes
    Catalina 310
    US St. Simons
    I went through this same exercise because my boat was listed in the original brochure at 4 ft draft. I called Catalina and got no useful information. Have seen 4 ft, 4 ' 4" and even 4' 10" listed as the shoal draft for thilisted. I have twice measured it while hauled out and both times measured 5 ft. As far as I am concerned my boat has 5 ft draft and mine was the first one built.
    bob
     


    Alansails likes this.
  3. pk104

    pk104

    Joined Jun 30, 2009
    196 posts, 2 likes
    Catalina 310
    US Atwood Lake
    Haul 104 drafts 4’10” and is a wing keel. During a visit to Catalina Flordia factory an employee told me they used keels from another model that were deeper.
     


  4. Bill Roosa

    Bill Roosa

    Joined Jun 6, 2006
    6,859 posts, 99 likes
    Hunter 40.5
    US Harrington Harbor North, MD
    Draft has to be specified with a loading factor. Straight out out of the factory with no extras, people, food, beer, clothing, safety gear, instruments, water, fuel........ the draft is going to be less than "loaded out for cruising" there should be a factor in the owners manual that tells you how many inches the draft increases for every 100 lb of loading
     


  5. jviss

    jviss

    Joined Feb 5, 2004
    1,811 posts, 102 likes
    Tartan 3800
    US Westborough Westport, MA
    I have never seen or heard of such a thing! Really? I have manuals for the C36 and Tartan 3800, no such mention.
     


  6. Lisa

    Lisa

    Joined Thursday
    6 posts, 4 likes
    Catalina 310
    US Middle River, Maryland Middle River, Md
    Called Catalina, left a message, no reply.

    Called a local Catalina dealer and here's the skinny.
    The first hulls out of production were 4'10" draft, even though the brochure states 4' for the wing keel. I think he said there was a law suit and a lot of the first hulls were retro fitted with a shorter keel under warranty. They ended up being more in the 4'6" range. He wasn't sure of the exact hull number but was guessing by around 125 they redesigned the keel trunk and got it down to 4'4". There ya have it, so know if someone chimes in with hull #200 and has a 4'10" wing keel all bets are off.
     


    Jackdaw and jviss like this.
  7. Jackdaw

    Jackdaw

    Joined Nov 8, 2010
    7,111 posts, 1,105 likes
    Beneteau First 36.7 & 260
    US Minneapolis MN & Bayfield WI
    A boat should draw her rated draft when loaded to her Load Waterline.
     


  8. Alansails

    Alansails

    Joined Oct 3, 2011
    471 posts, 32 likes
    Anam Cara Catalina 310 Hull #155
    US Lake Erie/Catawba Island
    I bet you find out when you run aground :biggrin::)
    All kidding aside, I use 5' though we draw less than that- on Lake Erie we can run aground on Mud or ROCK, we also check our charts so we avoid the areas that can get us into big trouble.
    We have mud/sand in our channel but just outside there is a rock structure marked with a buoy that shoals up to 2' below the surface in 20' of water around it- now theres a surprise!
     


  9. Jackdaw

    Jackdaw

    Joined Nov 8, 2010
    7,111 posts, 1,105 likes
    Beneteau First 36.7 & 260
    US Minneapolis MN & Bayfield WI
    Amazing.
     


  10. u0958901

    u0958901

    Joined Apr 14, 2014
    5 posts, 0 likes
    catalina 310
    US Rock Hall, MD
     


  11. u0958901

    u0958901

    Joined Apr 14, 2014
    5 posts, 0 likes
    catalina 310
    US Rock Hall, MD
    Attached brochure shows specifications for 310
     

    Attached Files:



  12. Ron20324

    Ron20324

    Joined Jan 22, 2008
    5,532 posts, 347 likes
    Beneteau 323
    US Annapolis MD
    JV, I believe this is in the wrong thread?
     


  13. jviss

    jviss

    Joined Feb 5, 2004
    1,811 posts, 102 likes
    Tartan 3800
    US Westborough Westport, MA
    Ah, yes, you are right, thanks.
     


  14. marchem

    marchem

    Joined Nov 16, 2012
    422 posts, 14 likes
    Catalina 310, 2000, #31
    US Santa Cruz, CA Santa Cruz
    As part of another thread here I just did some calculations for how much weight is need to cause a change of 1 inch in waterline depth. For a Catalina 310, beam of 11.5': assume 1/2 of that area is the water surface. So 31x11.5*.5 = 178 square feet. 1" depth of that gives just under 15 cubic feet displacement. For seawater that's almost 1000 lbs. So adding 1000 lbs to a Catalina 310 should lower her about 1" in the water.
     


  15. Cat 310 #1 in GA

    Cat 310 #1 in GA

    Joined Jan 17, 2013
    196 posts, 16 likes
    Catalina 310
    US St. Simons
    I have a hard copy of this brochure. It also misstates the engine because mine has a 2 cylinder Yanmar!
     


  16. JK_Boston_Catalina310

    JK_Boston_Catalina310

    Joined Nov 18, 2010
    1,807 posts, 30 likes
    Catalina 310
    US Hingham, MA
    My 2001 shoal draft measured 4'9" to the factory waterline, 4'11" to our weekender weight and 5'1" to our cruising waterline. So weight is the big factor. For the 310 it is depressed one inch for every 1,082 pounds of weight you put on the boat (this includes the people too).

    Just as a sales pitch for the 310, ours just survived two category 5 hurricanes. One by running and one tied in a slip. We have sailed ours from Boston to the Caribbean and still love our boat!

    Let us know if you have any questions.
     


  17. JK_Boston_Catalina310

    JK_Boston_Catalina310

    Joined Nov 18, 2010
    1,807 posts, 30 likes
    Catalina 310
    US Hingham, MA
    From my research you are the only 310 with a Yanmar. All the rest were Westerbeke/Universal.
     


  18. marchem

    marchem

    Joined Nov 16, 2012
    422 posts, 14 likes
    Catalina 310, 2000, #31
    US Santa Cruz, CA Santa Cruz
    I heard that later 310s had a Yanmar, but have not actually seen that myself. There certainly have been lots of changes over the years; some small, some big. I think that's a Catalina tradition.
     


  19. leo310

    leo310

    Joined Dec 15, 2006
    10 posts, 1 likes
    Catalina Catlina 310
    CA Campbell River BC
    We have a 3 cylinder Yanmar 29 hp unit on haul #44, there has been other units with yanmars it just luck of the draw when the boat was made and what motor was on site.
     


    JK_Boston_Catalina310 likes this.
  20. marchem

    marchem

    Joined Nov 16, 2012
    422 posts, 14 likes
    Catalina 310, 2000, #31
    US Santa Cruz, CA Santa Cruz
    Your weight value is very close to my guesstimate above. That would imply that the 4000 pounds over the design displacement weight we saw should result in a 4" change from theoretical. It sure doesn't look like that much, in fact our waterline is several inches below the boot stripe, but who knows where that should be.
     



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