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1986 46 Post 4 blade props

Discussion in 'Post Yacht' started by ruby, May 5, 2012.

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  1. ruby, May 5, 2012
    #1
    ruby

    ruby Member

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    Has anyone installed 4 blade props on a 1986 46 Post with 671 tib's? What size and manufacturer of prop did you use?
  2. Capt J, May 5, 2012
    #2
    Capt J

    Capt J Senior Member

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    Try Frank and Jimmy's prop shop in Ft. Laud......they're really good about sizing and what's the best prop for you......
  3. RT46, May 6, 2012
    #3
    RT46

    RT46 Senior Member

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    i have a 46 with 3 blade 24x23 (slight cup) with same power and turn up to 2550 WOT

    the boat weighed about 48000 last time it was in the slings.

    1950-2000 is 17kts
    2050-2100 is 18 kts
    2150-2200 is 18.5-20kts

    i usually cruise around 2050 and hope to get 18-19kts depending on conditions, sometimes a little less depending on wind, tide, and sea conditions.

    I also usually run with less than 1/2 tank fuel unless on long range trip.


    BTW, I did have 24x27 and was only turning 2150,
    1950 was 17 kts
    2150 WOT was 21 kts


    I am very curious to see what your improvements or changes are with 4 blade.
  4. Beau, May 7, 2012
    #4
    Beau

    Beau Senior Member

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    Hi Guys

    I don't believe adding 4 blades will increase speed, but it will give you better bite when you slip your clutches into gear. And help you to churn up some of that nice "mud" you've got over there Ruby.
  5. ruby, May 7, 2012
    #5
    ruby

    ruby Member

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    Beau you aren't lying, with this mornings extremely low tide I seen much mud churned up as I pulled out of my slip on my way over to West Shore.
  6. RT46, May 7, 2012
    #6
    RT46

    RT46 Senior Member

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    Ruby,

    what kind of numbers are you getting now?



    RT46
  7. RT46, May 7, 2012
    #7
    RT46

    RT46 Senior Member

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    correction to my response to this post, I just checked my records, sorry


    i had 24x26 3 blade not 24x27 and was turning 2150 WOT

    i changed to 24x23 and am at 2550 WOT
  8. RT46, May 7, 2012
    #8
    RT46

    RT46 Senior Member

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    by the way, you North Shore guys dont know shallow until you run the Great South Bay (aka Great Shallow Bay) and take the inside route through Morriches....

    in a 40+ SF, running inside from Fire Island Inlet to Schinnecock Canal can be an emotional event passing Morriches Inlet on the inside and one or two low spots in Tiana Bay.
  9. ruby, May 7, 2012
    #9
    ruby

    ruby Member

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    RT 146 I know your pain, I grew up in south Wantagh and made that run out east many times as a kid. I am presently running 3 blades, whatever was factory stock I think they are 24 x 26, on my tachs they are spinning 2450 and 2475 WOT loaded, and my detroit tech confirmed very close to that with his tach(I don't remember his numbers off hand but they were close). When we sea- trialed my boat 10 days ago I hit 28 mph wot on my Iphone gps and the Garmin gps on the boat showed 24 knots. I think at 2150rpm I was around 19-21 knots.
  10. RT46, May 8, 2012
    #10
    RT46

    RT46 Senior Member

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    Ruby,


    btw, you may have this graph already, it was in my post owners book.

    if you dont have it, this gives you a pretty good idea of your fuel burn on the 671 TIB.

    regards,
    RT46

    Attached Files:

  11. ruby, May 8, 2012
    #11
    ruby

    ruby Member

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    Thanks for the power graph, that is one thing that I have to look into getting. I unfortunately did not receive any owners manual or electrical diagrams from Post. The person I bought the boat from never had it.
  12. ruby, May 10, 2012
    #12
    ruby

    ruby Member

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    RT if you don't mind e mailing me the owners manuals it would greatly be appreciated, Thank You Ruby
  13. RT46, May 13, 2012
    #13
    RT46

    RT46 Senior Member

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    will do....give me a day or two, it will be on the way.....
  14. P46-Curaçao, Jul 6, 2013
    #14
    P46-Curaçao

    P46-Curaçao Senior Member

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    Do we have LH and RH props? :rolleyes:
  15. RT46, Jul 6, 2013
    #15
    RT46

    RT46 Senior Member

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    yup, I do
  16. Davidoc, Jul 9, 2013
    #16
    Davidoc

    Davidoc Senior Member

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    Performance Chart

    I was wondering if you happen to have this chart for JT 692's.

    Thanks a lot

    David
    OUTPOST