Non PVS vs PVS Propellor

[Razorbill RIBs]

As above, can anyone in the know suggest the pros and cons of each.....have been offered a prop that is non PVS, but which became PVS later in its production (later models were)....

Is there a performance benefit to PVS?....Seller believes non PVS improves hole shot (good for our purpose).....Is there any other detrimental reasons not to run non-PVS?

This would be for the Optimax 150.....

Many thanks

[martini]

I wouldn't be too fussed about having non pvs Dan, I think only pro racers are going to notice the difference. Mine are pvs but I've never even bothered to try them without the blanking plugs in.

[Razorbill RIBs]

Originally Posted by martini

I wouldn't be too fussed about having non pvs Dan, I think only pro racers are going to notice the difference. Mine are pvs but I've never even bothered to try them without the blanking plugs in.

Fab, thanks Matt....think I'll go for it....if it doesn't do what I hope (performance wise) will stick it up on here for sale.....TBH would be handy to try before i buy, but the money is okay so will take an educated punt....

Dan

[martini]

What sort of prop is it and what boat?

[Razorbill RIBs]

Highfive 21 pitch Opti 150, Ocean 675....

FYI, We have a 19 pitch Laser II for it....38 ish knots max revs 5,100 ish and weaker hole shot (pants for divers /full boat)

Have a 15 pitch four blader for divers etc max revs still only 5,300 ish and great hole shot.....still achieves 34 knots (ish)

Have A 13 pitch four blader brilliant for divers and still reaches 31 knots (ish)

Want to open up top end for when we are 'playing' and still have good grip /hole shot (have been told the HighFive has good sternlift too). Lots of people have sung their praises, so will take a punt.....

TBH have had lots of (conflicting) prop advice about what should /shouldn't work....remains a black art to me i'm afraid because the advice hasn't always been anywhere near correct....will let the forum know how we get on if we get hold of it.....

also, for interest, I know that Brad and a few others also share our experience of never getting close to top revs for the Opti..... not that it matters

What do you run on the Optis Matt? Again, purely out of interest....

[martini]

Playing with props is twice as expensive for me but it's the only way to find out what works!

I started out with mirage plus 21" which gave around 42-43 kts at around 5200 wot but slipped like crazy under acceleration and made the steering really heavy.

Barrus suggested Revolution 4's which were much better, I went for 19" but again slightly big with 5300ish and 40kts.

I then got hold of rev 4 17", I can hit the rev limiter now but at normal cruising speed 30ish kts although I'm revving higher (4500) there's less load on the motors so consumption is much improved. I'm now getting about 1.3-1.4 l/nm.

I've just bought a cheap pair of Vensura 19" 4 blades but not tried them yet. I believe they're more bow lifting so should be interesting to see how they compare with the mirage and rev4, both being stern lifters.

Highfive could well be a good choice for you, I'm not sure how their pitch compares but 21" might be too big to peak. All trial and error though. I'm happy to lend out any of mine if any use to you.

I've got a pair of vengeance as well, can't remember the size though.

[Turbodiesel]

Originally Posted by martini

Playing with props is twice as expensive for me but it's the only way to find out what works!

I started out with mirage plus 21" which gave around 42-43 kts at around 5200 wot but slipped like crazy under acceleration and made the steering really heavy.

Barrus suggested Revolution 4's which were much better, I went for 19" but again slightly big with 5300ish and 40kts.

I then got hold of rev 4 17", I can hit the rev limiter now but at normal cruising speed 30ish kts although I'm revving higher (4500) there's less load on the motors so consumption is much improved. I'm now getting about 1.3-1.4 l/nm.

I've just bought a cheap pair of Vensura 19" 4 blades but not tried them yet. I believe they're more bow lifting so should be interesting to see how they compare with the mirage and rev4, both being stern lifters.

Highfive could well be a good choice for you, I'm not sure how their pitch compares but 21" might be too big to peak. All trial and error though. I'm happy to lend out any of mine if any use to you.

I've got a pair of vengeance as well, can't remember the size though.

Im guessing the Vensura prop will rev really high!!

[Turbodiesel]

PVS will just really give you slightly better pick up. Wont change the top end speed.

[martini]

Originally Posted by Turbodiesel

Im guessing the Vensura prop will rev really high!!

I went up 2" in pitch over my rev4's to compensate but time will tell!

[Damien.]

You've probably already done your research Dan but here's some bet time reading for ya;

http://www.mercurymarine.com/propell...hnologies/pvs/