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Prop comparison

  • 21-06-2018 7:51pm
    #1
    irish snowblower
    Registered Users, Registered Users 2 Posts: 38 ✭


    I have a four meter rib with a forty horsepower Yamaha the prop on it is 11 3/8 x 12 but I made bits of it. When I bought the rib it came with a second prop but it is 11 1/8 x 13. On its current prop it is hitting 6000 rpm wot does anyone know what the effect will be if I change it to the second prop
    Thanks for any help


Comments

  • #2
    fergal.b
    Moderators, Motoring & Transport Moderators, Sports Moderators Posts: 6,344 Mod ✭✭✭✭fergal.b


    With the bigger prop you might get an extra MPH or two at the top end but a little slower take off speed, it should also bring your RPM down a bit as your a bit high at 6000 I believe 5500 is recommend for a forty hp.





    .


  • #3
    irish snowblower
    Registered Users, Registered Users 2 Posts: 38 ✭irish snowblower


    Thanks Fergal I will give it a try so I had a feeling my boat moving skills in hodson bay would pay off some day :)


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