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    15 hp outboard question-gctid364602

    Hello all,

    We have an Avon RIB 3.10 10' 3" that we currently use with a 9.9 2 stroke Merc with a dolephin bolted to the cavitation plate to aid with planning. As our kids our getting older (12 and 15) we've lost our ability to get up on plane and so I am wondering if we upgrade to a 15 hp (2 stroke) if we could get the boat on plane with 4 "adults"? The boat does not have a steering wheel or any other extras other than a standard 6 gallon plastic tank that I usually hold 3-4 gallons in. It is rare that we are going very far with the 4 of us but I am considering if it is worth up grading

    Thanks for the comments!

    Trev

    #2
    I doubt it. I have almost the same (10.5' Zodiac RIB w/ 15 HP Nissan) and won't plane with 4 adults, but it will with three. By myself, it's crazy fast!

    Comment


      #3
      I had a 15hp evinrude on my 11' Apex with helm seat. With 2 adults and two kids it will get up on plane...takes a bit but it does. Just swapped out for a 20hp Merc 4 stroke.
      Sean
      1987 3870
      Crimson Pride II
      Past Commodore Mukilteo Yacht Club
      MMSI: 338080226

      Comment


        #4
        Isn't it a very simple mod to the carb to make the 9.9 a 15 hp? I thought otherwise they were identical. That should make it easy to find out what 5 more hp will do.

        Comment


          #5
          Don Buxton wrote:
          I doubt it. I have almost the same (10.5' Zodiac RIB w/ 15 HP Nissan) and won't plane with 4 adults, but it will with three. By myself, it's crazy fast!
          That is my experience too. My Zodiac Yachtline 310 w/ a two-stroke Mercury 15hp flies w/ just me (it is faster than my boat) and plods along w/ four.

          Comment


            #6
            My Aquapro 11.5' aluminium RIB with a Yamaha 15HP 4-stroke would not plane with 4 adults. That was with a Doelfin. With proper Smart Tabs, it would plane. The Doelfin was of questionable value.

            I sold the 15HP and put on a Yamaha 25HP 2-stroke. It really flies now.

            Comment


              #7
              Thank you all, this is about what I expected....tough to rationalize getting into a different motor for minimal results, but the again if I were rational I wouldn't own a boat:arr

              Comment


                #8
                I'm surprised by what I'm reading here. We have an 11' Flexboat, rigid bottom with a 15hp 2 stroke Merc that gets up on a plane pretty easily with 4 people. I don't particularly like the engine, but it sure seems to have enough power for our purposes.

                Comment


                  #9
                  http://www.maximarine.com/products/lifters/index.html

                  http://youtu.be/Zjhc4T7kExw

                  I was disappointed with my dinghy performance. Avon 10' RIB...

                  With 4.5 HP 2-stroke:
                  • No lifters, no planing (regardless of weight of person)
                  • With lifters, will easily plane w/ me (close to 185-90 lbs) :worth
                  • With lifters, will *almost* plane with 2 persons (370-380 lbs combined)




                  With 8 HP 2-stroke:
                  • With lifters, SCREAMS with just 1 person onboard nthego:
                  • With lifters, will easily plane with 2 adults (same 2 as above, haven't tried 3)




                  I read the testimonials, they all just rave about these things. I found them hard to believe, but for $120 bucks, thought it was worth a shot. The testimonials are NOT exaggerating! It's insane the improvement these things make. Another upside - less wake off plane and better control when I am cruising in the docks/no-wake zones...

                  IMO for $120 bucks, it's worth trying them out... Cheaper than re-power.

                  Comment


                    #10
                    RAVEN SONG wrote:
                    Hello all,

                    We have an Avon RIB 3.10 10' 3" that we currently use with a 9.9 2 stroke Merc with a dolephin bolted to the cavitation plate to aid with planning. As our kids our getting older (12 and 15) we've lost our ability to get up on plane and so I am wondering if we upgrade to a 15 hp (2 stroke) if we could get the boat on plane with 4 "adults"? The boat does not have a steering wheel or any other extras other than a standard 6 gallon plastic tank that I usually hold 3-4 gallons in. It is rare that we are going very far with the 4 of us but I am considering if it is worth up grading

                    Thanks for the comments!

                    Trev
                    I have a similar sized dink that I use to run a merc 25 on. It ran like a cat on fire.

                    I have since added a helm so I could give you a good price on my old merc.
                    SoundDreams.org

                    Comment


                      #11
                      I just purchased a West Marine RIB 310 by Zodiac, rated for a 15hp motor.

                      I got a crazy good deal on a brand new 20hp Mercury, which is 31 pounds heaver than the 9.9hp motor. I was a bit worried at first until I got out on it and wow what a perfect combo!

                      Most manufacturers under estimate max recommendations, probably because of liability issues not performance qualities?

                      The boat with two adults in it really runs like a dream. I can't wait to really put it to the "test".

                      I have now ordered the the lifts that were recommended on this thread and can't wait to install and test those.

                      One word somes it up - FUN!

                      Comment


                        #12
                        HarleyDawg wrote:
                        http://www.maximarine.com/products/lifters/index.html

                        http://youtu.be/Zjhc4T7kExw

                        I was disappointed with my dinghy performance. Avon 10' RIB...

                        With 4.5 HP 2-stroke:
                        • No lifters, no planing (regardless of weight of person)
                        • With lifters, will easily plane w/ me (close to 185-90 lbs) :worth
                        • With lifters, will *almost* plane with 2 persons (370-380 lbs combined)




                        With 8 HP 2-stroke:
                        • With lifters, SCREAMS with just 1 person onboard nthego:
                        • With lifters, will easily plane with 2 adults (same 2 as above, haven't tried 3)




                        I read the testimonials, they all just rave about these things. I found them hard to believe, but for $120 bucks, thought it was worth a shot. The testimonials are NOT exaggerating! It's insane the improvement these things make. Another upside - less wake off plane and better control when I am cruising in the docks/no-wake zones...

                        IMO for $120 bucks, it's worth trying them out... Cheaper than re-power.
                        Great info, that is why I love this forum so much! By any chance are you aware of the performance with a 9.9 on an Avon 3.1 with 4 adults??

                        Thanks again!!

                        T

                        Comment


                          #13
                          RAVEN SONG wrote:
                          Great info, that is why I love this forum so much! By any chance are you aware of the performance with a 9.9 on an Avon 3.1 with 4 adults??

                          Thanks again!!

                          T
                          I don't - but weather permitting, I'll see if I can round up a couple of extra people on the dock this weekend, and give my 8 HP a go with 4 people on board.

                          Comment


                            #14
                            Sunnydude wrote:
                            I had a 15hp evinrude on my 11' Apex with helm seat. With 2 adults and two kids it will get up on plane...takes a bit but it does. Just swapped out for a 20hp Merc 4 stroke.
                            What did you do with the 15hp evinrude? was it a two stroke?

                            Comment


                              #15
                              HarleyDawg wrote:
                              I don't - but weather permitting, I'll see if I can round up a couple of extra people on the dock this weekend, and give my 8 HP a go with 4 people on board.
                              I do not think the 8 hp is going to handle 4. I have an 8 hp Nissan four stroke and with me and my daughter it will plane, I am not a small guy so adding my wife to the mix makes the same as four and we can not get on plane.

                              We can get close but not quite there.

                              Comment

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