Outboard props

[West Coast Newbie]

I have a small craft vessel, a Skipjack 320, L3.2m, W 1.3m and Deph 0.600m. Double hull.
Made of fiberglass,and has 130% buoyancy. Certified to carry 2  people, weight 233kg.
I will be using te vessel in Langebaan lagoon, Knysna lagoon and every river, estuary inbetween where I get consent to do so.


What I exspect the prop to do, to get me home fast if the weather changes. I am a pensioner, so I do not want to speed for pleasure, only when I need it.


Motor: Yamaha 15Hp, 2 stroke 2008 model. Short shaft.


What type yamaha  prop you sugest and the dimensions of the prop please guys.




Guys please help Oom Hennie

[Capt. Hook]

With your 15Hp you won't have much of a range on your prop pitch, you need the pitch that is balanced for your boat.
A standard motor most likely won't allow you to increase diameter,

A higher pitch could actually slow you down and increase fuel consumption and engine load.
Your prop should allow your engine to rev up to 5500rpm, a pitch to high would start bring your rpm down and maybe not even get you on the plane, a pitch too low will have you over revving.
4 Blade props do not improve top end, they help only in the mid range and if you go 4 blade your normally go down a pitch.
Props are expensive and you can end up wasting money trying to get more speed which you may not get.
Engine power, boat weight and length will determine you correct pitch.
Your boat probably already has the correct prop
If you want a lot more speed you need more power to drive a bigger prop, if the boat can carry the additional weight.