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  1. #1

    Thumbs up What prop on 2007 BF75D?

    Last year I bought a 2010 Beneteau Antares 580 with a BF75D 2007 mounted.
    Untill now I mainl6 used it at low speeds for trolling but last week I took it for a 15 mile trip to the drydock to revise the engine.
    It only picked up speed when I surfed some waves , otherwise it kept speed at about 13 knots.
    The mecanic (not a Honda mecanic) said it could be the prop, which was new when I bought the boat.
    What prop is recommended for a 2000 lb vessel ?
    donít need speed, the seas around here in the Biscay bay area normally donít allow so.
    inside the bay it gets up to speed,around 25 knots,but otherwise it doesnít get in to plane easily.
    thanks

  2. #2
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    Apr 2018
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    Default Re: What prop on 2007 BF75D?

    Let's start with some more info. What max rpm are you achieving with your current prop and at a size is your current prop?

  3. #3

    Default Re: What prop on 2007 BF75D?

    Quote Originally Posted by iang6766 View Post
    Let's start with some more info. What max rpm are you achieving with your current prop and at a size is your current prop?
    The actual prop is a 10 17.
    donít know the exact revs as my meter is malfunctioning , when it was working inside the bay wot it would go to abt 5500.
    At sea with 1-1,5 mts waves it didnít get into plane unless riding a wave.

  4. #4

    Default Re: What prop on 2007 BF75D?

    You may have the 17" part right, but I doubt seriously you have a 10" diameter prop.....

  5. #5

    Default Re: What prop on 2007 BF75D?

    Quote Originally Posted by Alan Hicks View Post
    You may have the 17" part right, but I doubt seriously you have a 10" diameter prop.....
    but Click image for larger version. 

Name:	2AE34AAB-ACD3-411E-8D7A-ED7723A80B6B.jpeg 
Views:	10 
Size:	50.2 KB 
ID:	24126 that’s what it says...doesn’t it?
    Last edited by Ruigie; 07-07-2020 at 02:03 PM.

  6. #6

    Default Re: What prop on 2007 BF75D?

    Pretty sure if you pull the prop, and look at the end of the hub, you'll find the correct diameter.

  7. #7

    Default Re: What prop on 2007 BF75D?

    Quote Originally Posted by Alan Hicks View Post
    Pretty sure if you pull the prop, and look at the end of the hub, you'll find the correct diameter.
    The mechanic had just put it back on, will ask him.
    What do the number on the pic mean then?

  8. #8

    Default Re: What prop on 2007 BF75D?

    Sorry, no idea.

  9. #9
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    Default Re: What prop on 2007 BF75D?

    That boat should go well with a 13 1/4 x 17

  10. #10

    Default Re: What prop on 2007 BF75D?

    Quote Originally Posted by iang6766 View Post
    That boat should go well with a 13 1/4 x 17
    Thanks! Will check this out.
    what is your opinion on the actual prop?

  11. #11
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    Default Re: What prop on 2007 BF75D?

    As Alan said , that cannot be a 10x17, they don't make a 10 inch prop for that size motor.

  12. #12

    Default Re: What prop on 2007 BF75D?

    If we had the correct size for your existing prop, we might be able to come up with an educated guess (based on experience) for a prop that might do a better job. What may make that guess even more educated would be to know the rpm that prop is turning at wide open throttle.

  13. #13

    Wink Re: What prop on 2007 BF75D?

    Quote Originally Posted by Alan Hicks View Post
    If we had the correct size for your existing prop, we might be able to come up with an educated guess (based on experience) for a prop that might do a better job. What may make that guess even more educated would be to know the rpm that prop is turning at wide open throttle.
    Prop mounted now is a 13.25 x 17 so should be correct.
    made the trip from yard to berth today with 1 + meter waves and at full throttle rpms around 3500 speed around 10 knots.
    inside the bay it does get into plane and picks up speed upto 25 knots with abt 5500 rpm.
    used to have a similar boat with a 2000 Yamaha 80 which would get into plane in any condition or load.
    your educated guesses very much appreciated.

  14. #14

    Default Re: What prop on 2007 BF75D?

    I'm not sure going with a smaller prop is the answer here. The issue would be the rpm's the engine would be turning with that smaller prop when on plane!

    This sounds more like a case where your boat is WAY under powered. Maybe the motor size selected based with a priority on cruising only? A 4 blade 15" prop may help as a last resort, but it may require attention regarding rpm's in calm water at wide open throttle.
    Last edited by Alan Hicks; 07-11-2020 at 08:41 AM.

  15. #15

    Default Re: What prop on 2007 BF75D?

    Quote Originally Posted by Alan Hicks View Post
    I'm not sure going with a smaller prop is the answer here. The issue would be the rpm's the engine would be turning with that smaller prop when on plane!

    This sounds more like a case where your boat is WAY under powered. Maybe the motor size selected based with a priority on cruising only? A 4 blade 15" prop may help as a last resort, but it may require attention regarding rpm's in calm water at wide open throttle.
    Have the feeling that indeed it is underpowered, although not sure if so much as WAY because most of these boats normally have 90 hp engines which is not really a big leap.
    max hp for this boat is 100 hp.
    To do a ďcheapĒ test I ordered a SE 400 hydrofoil to see if this could be a solution as some say.
    No drilling requiered so if it doesnít work I take it off and sill reconsider selling this engine and go for a BF 100...
    thanks againfor your advise!

  16. #16
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    Default Re: What prop on 2007 BF75D?

    One more question, is this boat dry stored or kept in the water? Just for the record, there is not a lot of difference between a 75 and 100, I had a customer upgrade from a 75 to 100 , same boat, same prop, he gained 3 knots and 300rpm, strange but true. Perhaps you should be looking at things like water in the hull, growth etc.I still maintain that having looked at your boat specs, it should perform well with a BF75 carrying a light load

    .

  17. #17

    Default Re: What prop on 2007 BF75D?

    Quote Originally Posted by iang6766 View Post
    One more question, is this boat dry stored or kept in the water? Just for the record, there is not a lot of difference between a 75 and 100, I had a customer upgrade from a 75 to 100 , same boat, same prop, he gained 3 knots and 300rpm, strange but true. Perhaps you should be looking at things like water in the hull, growth etc.I still maintain that having looked at your boat specs, it should perform well with a BF75 carrying a light load

    .
    I did the hull last week when it was on the docks, normally it’s afloat at the birth but not to much growth on it.
    I agree with you that this boat should perform much better with this engine and sometimes it seems to me that the boat is lying heavy in the water.
    However I don’t see any water in the hull and beside the fishing stuff and the two anchors there is not much weight on board.
    I will try leaving most of the heaviest stuff on the shore but it shouldn’t make that much difference.
    Top speed isn’t the priority but with average sees it should perform better,planing at 15 knots is my aim.

  18. #18

    Default Re: What prop on 2007 BF75D?

    Quote Originally Posted by iang6766 View Post
    Let's start with some more info. What max rpm are you achieving with your current prop and at a size is your current prop?
    Just tested again, this time rev gauge seemed pretty accurate.
    at WOT on flat water achieved 24 knots at 4800 revs, didnít go higher.
    then alarm went off , engine finally stalled and after a minute started without any alarm.

  19. #19

    Default Re: What prop on 2007 BF75D?

    So there's another issue in play here. One that needs some attention ASAP.

    How old is the water pump impeller?

    When the alarm went off did you have a red light on as well?

  20. #20

    Default Re: What prop on 2007 BF75D?

    Quote Originally Posted by Alan Hicks View Post
    So there's another issue in play here. One that needs some attention ASAP.

    How old is the water pump impeller?

    When the alarm went off did you have a red light on as well?
    Impeller changed last week (old one had less than one year and was in good condition)as well as internal anodes, all oils and filters, sparkplugs checked and calibrated .
    yes red light came on.

  21. #21
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    Default Re: What prop on 2007 BF75D?

    Most common cause of overheat on the BF75D is salt build up around the block thermostat behind the electrical component case.

  22. #22

    Default Re: What prop on 2007 BF75D?

    Quote Originally Posted by iang6766 View Post
    Most common cause of overheat on the BF75D is salt build up around the block thermostat behind the electrical component case.
    Changed that thermostat also and cleaned housing all the way inside .checked after a run and it was obvious stat opened up and water ran through it.
    also checked temp with heatgun and marked around 149 F

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