Nautique - Latest Approved Props

[Kelvin]

Just saw this in the latest revision of the Approved Towboat list for 2012. The following props have been approved for use on the SN200.

 

AC 422 4 12.5 x 15.5 (.105 cup) Nibral

AC 668 4 12.5 x 15.5 (.150 cup) Nibral (6.0L only)

AC 654 4 12.5 x 15 (.105 cup) Nibral

AC 1458 3 13 x 14 Nibral

 

Interesting, the AC 1468 4 12.5 x 14.25 isn't on the list this year. Also, does anyone have any idea what kind of RPMs the AC1458 will do with it being a 13 pitch prop?

 

 

[ScaredOfCorbets]

I know there are many factors in prop design and performance. A 13 pitch moves the boat appx 16% less than a 15.5, thus one would expect about a 16% increase in rpm.

 

someone just have to buy and plug one onto their 200.

[ScaredOfCorbets]

and you would expect a better hole shot.

[ForrestGump]

We tested the 1868(gone), 422, and 654. I loved the 654 on the 5.7 last year. I believe it's now the standard prop if you order a 200.

[jdarwin]

I'm curious how the 654 would work on the 196. Maybe someone in the North Houston area can hook me up!!

[Kelvin]

@ScaredOfCorbets most of the 2010s came with the 1468 (a 4 blade 14.25 pitch prop) and many complained about the high RPMs and gas consumption. The 1458 is a 13 pitch which would appear to increase the RPMs even more. Granted its a 3 blade where the 1468 is a 4 blade so there may not be a direct comparison. Seems like this will be the Open Men's jump prop.

[ForrestGump]

3 blade is jump prop.

[swc5150]

@ShaneH

How are the revs with the 654?

[Inboardfix]

@swc5150 these 654 numbers are from a 2012 SN200 w/5.7:

 

32 mph 3460

34 mph 3720

36 mph 3970

 

No skier and the tach reading was from ZO's rec mode readout.

[ScaredOfCorbets]

@Kelvin...that WAS what I said,...'thus one would expect about a 16% increase in rpm.'

[allycat]

yep

[skierjp]

The early 200's never came with the 3 blade 1458. This is considered the jump prop. The tournament prop for this year is the 654 for the 5.7 and the 422 for the 6 liter. Expect around 200 drop in RPMs. The 1868 is no longer on the list.

The RPM for a 6 liter ahould be around 3640 at 34 and 3840 for 36.

[swc5150]

@inboardfix

Thanks for the data. That's a significant difference, and I think we'll give one a shot.

[ForrestGump]

The 654 puts the 5.7 in a better spot in the torque curve, IMO.

[dave2ball]

Switching to the 654 prop was one of the best moves CC made for the 200. The boat drops 250 to 300 RPM's and has a pull the is very inline with the 6 Liter. It has a good hole shot no loss of power or acceleration .

[JC McCavit]

Like @jdarwin, I would like to hear how the 654 compares to the 422 on the older 196 Nautiques. Would there be a drop of 250 to 300 RPM? That might save a lot of fuel.

[ForrestGump]

JC, The rpm would increase in comparison to the 422. The drop in rpm on the 200 is in comparison to the 1868 which was standard until now.

[dave2ball]

In my opinion the 196 was propped perfect. The RPM's were not too high plenty of power. If you start running the RPM's lower you will lose the in the power curve and the boat will feel like a dog it you go too low.

[JC McCavit]

@ShaneH - thanks for the explanation. @Inboardfix - do you have RPMs for the same boat with the 422?

[T8skier]

Can a prop shop change pitch to make a 1468 prop into a 654 prop?

[Inboardfix]

@JC McCavit Sorry, no numbers on the 422. However, I do know it wasn't uncommon for this prop to be used rather than the crazy-revving 1868 so someone should be able to provide the rpm numbers for you. .5 more pitch of the 422 should lower the rpms by as much as 100-125.

 

@T8skier Haven't had any luck w/props where the pitch has been changed. They always seem to have a little more vibration. However, the prop shops I've done/do business w/all seem convinced changing a prop by 1 pitch isn't a problem.

[Inboardfix]

@JCmccavit To clarify I meant .5 more pitch of the 422 compared to the 654 should lower the rmps by as much as 100-125.

[Jody_Seal]

Hmm! Just be care full where the cup is increased on the ACME as it is a progressive / regressive cup. I hand manipulate cup on props all the time. I have a set of cup gauges for this purpose. ACME are very thin in the blades and can be easily knocked out of balance. I would not send my propeller to just any repair shop for tweaking, rather back to the manufacturer or a shop that has some interest and back ground knowledge of how it will be used. Or step up to the plate and get a current application wheel.

I have a 668 on a 6.0HO 200 Nautique that I had to put about .25 thousands in the cup as it would go beyond the 5650 RPM mark at WOT, then a check engine light would come on!!!!

The ACME 422 and 668 are essentially the same prop's with the 668 having more cupping both 12.5X15.5 in size.

[DW]

@Jody: where do you or did you get a prop cup gauge? I do my own prop tweaking and as you mentioned, the ACME is pretty easy to manipulate (lots easier than the old SS props).

[Jody_Seal]

Made mine on a bridgeport mill.

[swc5150]

Anyone know who has the lowest price on a 654?

[skinautique200]

what about a short setup around 1750' full 6 ball course.. 5.7 vs 6 liter and what prop?

 

when we skied it in Nov before it got cold the 5.7 200 1868 felt slower than a 196 w/422 getting up to speed.