Prop for Ski Nautique 200

[Nids]

1492?

Checked through ACME's site and noticed they manufacture a prop (part number 1492) with a slightly bigger diameter and higher pitch (same cup and blade count). I've ordered the 200 CB with the ZR 409 engine and am interested in gaining as much top end speed as possible.

ACME 422: 12.5 x 15.5
ACME 1492: 13.5 x 16

Been following this post and a member mentioned a drop of 500rpm when they switched from the 654 to the 422. Would it be safe to say that the 1492 would produce a drop in 1,000rpm at WOT? My aim is to get the top speed of the 200 up to about 51-52mph without having a significant impact on the hole-shot or bow angle (nose should to stay down to avoid porpoising).

[2gofaster]

No, it wasn't 500 drop from the 654 to the 422. It was from the 14.25 pitch prop that we saw the 550rpm drop.

[Nids]

No, it wasn't 500 drop from the 654 to the 422. It was from the 14.25 pitch prop that we saw the 550rpm drop.

Apologies; thank you for the correction. I've contacted ACME regarding their thoughts on the 1492 though the 422 also seems like a good wheel for the 200..

[TRBenj]

Checked through ACME's site and noticed they manufacture a prop (part number 1492) with a slightly bigger diameter and higher pitch (same cup and blade count). I've ordered the 200 CB with the ZR 409 engine and am interested in gaining as much top end speed as possible.

ACME 422: 12.5 x 15.5
ACME 1492: 13.5 x 16

Been following this post and a member mentioned a drop of 500rpm when they switched from the 654 to the 422. Would it be safe to say that the 1492 would produce a drop in 1,000rpm at WOT? My aim is to get the top speed of the 200 up to about 51-52mph without having a significant impact on the hole-shot or bow angle (nose should to stay down to avoid porpoising).

There is no simple formula to determine what prop will work best... that is why this discussion is so interesting. It is not simply a matter of more pitch = more mph. Instead, it is a careful balance of selecting a prop that runs at the correct RPM for the boat and engine in question. In theory, top speed will be maximized if you can prop the boat to run right around its peak hp when at WOT. If Im not mistaken, the 409 has a hp peak that occurs in the 5400-5600 rpm range- so one would think that a prop that turns in that range would give you the best speed... it will be interesting to see what Jody reports.

I would think that sticking a 1490 or 1492 on the boat would cut the RPM down pretty significantly- so you would never get to the point where the engine is making its peak hp. Of course, any time you go up in pitch, there will be a holeshot penalty to pay.

If someone could get a stock 200 above 50 with just a prop change, that would be big news. I would be curious if anyone has done similar testing on an Excal powered boat. From what Im hearing, its top end would be marginal for barefooting (42-43mph).

[teamseal]

The fasted I have had the new (11) CB 196 is 46.8 with the 654 then again it only has 15 hours on it. the only way to get some serious speed out of the 200 is serious HP. I run a non cat 409 and am just getting into the tweeking stage. The previous 200 OB I managed to ring right at 49 out of it. 50MPH will be a strech on this boat as their are way to many forward protruding apendages on the bottom all designed for short line slalom. If you want to go fast get a boat designed to do so, other wise trying to get this hull over 50 mph is going cost $$$ into the motor.
The fastest I had the 2010 200 I had a OJ on it 13X15.5 .130 cup. This evening I am going out with the 422 for the first time on the new boat.
Try Royal Purple 15 w 40 that seems to get a few more ponies to the prop and keep the boat light as possable. another thing I noticed with the 10 OB was it did not really break in until about 75 hours.

[skiinxs]

Jody,
I will voice a strong second on the Royal Purple. At my 125 hr oil change last week I took a top speed test up and downwind, changed from dino oil to Royal Purple 15w40 synthetic at the dock, then ran another top speed test both ways 15 minutes after the first one and found that the Royal Purple was worth 6/10 of a mph and around 55 rpm on the top end. This may not sound like much, but I think it is rather significant at the top end. I had always assumed the increase in hp due to the reduced friction of the synthetic oil would be so slight it would be unmeasurable. I also agree that at around 60 hours the engine seemed to get a little stronger due to breaking in a little more. (I try to run dino oil the first 100 hours or so to help them break in a little quicker)
Dave

[2gofaster]

Jody, your boat was nick named The Beast this weekend at Covington. There were a few people who claimed their arms were 2 inches longer after skiing behind it!

[teamseal]

Did they ski Good??
I have found that boat to be kinda soft. We have pulled a lot of PB's in slalom with that boat hopefully it worked well for every one.

[Nids]

Prop Tests from ACME

The fastest I had the 2010 200 I had a OJ on it 13X15.5 .130 cup. This evening I am going out with the 422 for the first time on the new boat.
Try Royal Purple 15 w 40 that seems to get a few more ponies to the prop and keep the boat light as possable. another thing I noticed with the 10 OB was it did not really break in until about 75 hours.

Do you remember your top speed with the OJ 13x15.5 .130?

ACME did some in house testing and came up with these figures:

Prop desc cup max spd max rpm 34 mph
Max rpm & speed 34 mph
422 12.5 x 15.5 4b .105 43.5, 5380, 3700
654 12.5 x 15 4b .105 43.8, 5540, 3750
668 12.5 x 15.5 4b .150 43.5, 5130, 3650
1490 13.25 x 15.54b .060 43.8, 5400, 3600
1492 13.5 x 16 4b .105 42.5, 4640 , 3340
1598 13 x 14 3b .080 42, 5600, 4050
1868 12.5 x 14.25 .075 42 5600, 3960

Not interested in tweaking the engine at this point; just trying to go for a solid but fast prop. Nautique claims this hull rides higher than their previous designs; I thought that would make the boat faster (less contact with water). Will also look into changing over to Royal Purple post break-in..

[DealsGapCobra]

[B]Nautique claims this hull rides higher than their previous designs; I thought that would make the boat faster (less contact with water).

One look at the hull of the 200 and you will see why it's slow. A great wake for sure, but slow

[jdarwin]

200 Prop

Swapped the props on my 200 yesterday - the 422 is the way to go. RPM's at 3700 at 34mph. Boat feels fantastic from the business end as well. Felt soft at the buoy and firm behind the boat - even at 38-off. I'll be hard pressed to put the stock prop back on the boat.

[2gofaster]

Greg Meloon sent Charles an email the other day saying the 422 had been tested but wouldn't pass the jump acceleration tests. Which is ridiculous. They have jump specific props. Why not get the 422 or 654 approved on the 5.7 as slalom specific? Part of their reasoning is that they say Chet tested the 422 and 1868 and everyone liked the 1868 better because of the rooster tail. Yeah, well everyone who's tried the 422 vs the 1868 at our lake says to throw the 1868 in the deep end where it's 12 feet deep.

Arora sold his 08 to a guy this week because the guy specifically didn't want to deal with the elevated rpm of the stock 200.

[teamseal]

Looking forward to getting my 13X15.5 OJ back from Eric. He took some cup out as the boat was less quick at the lower acceleration speeds 15-35 mph but really skied well with a great top end.
Currently I have the 422 on the boat but am going to put a 14X16 three blade federal on just for giggles.

Yea it seems that if we can test for jump only set ups why can we not test for slalom only setups??? I have not been a fan of prop configuration from day one as it pertains to tow boat usage. I think that we all should be able to run whatever we feel is the best for our circumstances. I am not going to come to a three event tournament with a slow no power prop but then I still would like to be able to set the boat up to pull slalom only tournaments with what is deemed best for the skiers and not because the boat had to pass some BS acceleration test for jumping. The 654 has proven to me to be a good all around prop for this boat but I like the 422 for slalom and maybe even a 668 or the 13X15.5 OJ, If I go to a jump only tournament Then I would like to run my 13X14 OJ 4 blade which runs a whole lot smoother then the three blade acme that is currently approved and the OJ is a Screamer in the jump course!

[2gofaster]

Maybe we're bitching at the wrong people. Maybe we should be contacting the representatives of the towboat committee instead. Here they are below. I pulled this list from the towboat guidelines document and removed their street addresses.

AWSA TOWBOAT COMMITTEE
EAST
DOUG ROBBINS
Drobbins96@comcast.net

SOUTH
GREG WEBB
gwskis@msn.com

WEST
WILL BUSH (Co-chair)
willbush@att.net

MIDWEST
GEORGE LINDY (Co-chair)
georgelindy@comcast.net

SOUTH CENTRAL
MIKE HAMILTON
mikeski38@gmail.com

ATHLETE REPRESENTATIVES
FREDDY KRUEGER
ntmare230@aol.com

CHRIS KOSEK
ckosek200@msn.com

[Nids]

am going to put a 14X16 three blade federal on just for giggles.

Jody, sent you a PM.

Let us know how the 14x16 works out; I reckon it's gonna run the RPM's rather low