Change to J Series Props?

[Scubadoo]

Bought mine here:

https://www.propeller-shop.eu/

Thank you.

 

[Scubadoo]

I’ve just swapped 2 pairs of J series they are less than a year old , I think there J 5s I& anyone is interested. Client is going down a size as it’s not pulling full rpm. Selecting the right size is an art form, I’ve yet to find info from any VP dealer that’s got it right first time calculation. At first VP said it’s a straight numbers swap , then they said go up 2 sizes .
I’ve swapped many over the last 2 years with very mixed results that have given better and worse overall speed and fuel consumption figures .

Every boat is different, every engine is different, builders spend thousands on trials with different props, I’ve seen diesel boats go better on petrol props and vice versa. Don’t take what the dealer says as gospel, you would be very lucky if it’s right first time .

The J series is more robust as it has no bush and it’s a lighter prop so will spin up with less Effort, I’d surmise that’s where VP got the idea to go up 2 sizes at the outset , that might have worked if you were initially on stainless C series as boy are they heavy.

Younpays your money and takes your choice.

Thanks Paul for giving your experience and expertise, very helpful indeed.

Bit of a lottery to get it right first time, thinking more now of sticking with what I know works ie A6, rather than wasting money supporting volvo's profit in learning.

Do you or anyone else have data specs (pitch etc) for the J series compared to A series, it might help to see the differences.

 

[volvopaul]

Thanks Paul for giving your experience and expertise, very helpful indeed.

Bit of a lottery to get it right first time, thinking more now of sticking with what I know works ie A6, rather than wasting money supporting volvo's profit in learning.

Do you or anyone else have data specs (pitch etc) for the J series compared to A series, it might help to see the differences.

Prop calculations on Volvo accessories page

 

[chillee]

What did you end up doing Scubadoo?

 

[Scubadoo]

What did you end up doing Scubadoo?

Hi, after some consideration decided to stick with A6 and bought aftermarket which so far have performed very well. Too many unknowns with J series and could be an expensive mistake if I got it wrong, also I didn't like the hub setup with J series meaning if I hit something it could damage the outdrive not just the prop.


Edit. The new aftermarket props are Michigan Wheel from streamlined propellers, Guy called Geoff was very helpful and cost was £365+vat.