Prop size

[searider12]

Hi all, similar post to the one below - I have a new (to me) Johnson 115 on a 17' fibreglass boat...current prop is 15 diameter by 17 pitch. Felt a bit sluggish pulling skiers in the summer...any ideas whether I should reduce diameter/pitch? I'd have thought a 115 would pull a mono-skier easily but it felt like it was hard work.

Any advice welcomed.

[beamishken]

Originally Posted by searider12

Hi all, similar post to the one below - I have a new (to me) Johnson 115 on a 17' fibreglass boat...current prop is 15 diameter by 17 pitch. Felt a bit sluggish pulling skiers in the summer...any ideas whether I should reduce diameter/pitch? I'd have thought a 115 would pull a mono-skier easily but it felt like it was hard work.



Any advice welcomed.

Need to know what rpm your making at wot & type of boat, there can be a huge variation between 17ft boat types. Bearing in mind you can monoski behind 25hp upwards a 115 shouldnt realy struggle unless its already pushing a big heavy lumpy boat those old v4 johnsons were pretty grunty things too possibly reducing pitch may help rhat is assuming its running correctly

Sent from my SM-G950F using RIB Net mobile app

[searider12]

Thanks. Frustratingly, I'm not now going to manage to get out for a while so won't be able to test WOT RPM (though not sure how I'd know...the gauges don't work!) - it's a fletcher style boat and had an 80s Johnson 120 on before which had a bit more oomph...albeit with more noise and fuel to boot! This one just feels a bit limited...runs quietly and reliably but just feels like it's lacking some power.

Anyway - just thought I'd see if there's any obvious change I could make.

Thanks!

[paintman]

One of the cheap tachos from ebay?
Something like this: www.ebay.co.uk/itm/373697144890