89 Ski Prop - Tim Need Advise

89_SKI NAUTIQUE........THAT PROP IS B E A UTIFUL I THINK I WANT ONE ...

I finally got to try a 470 on my 89 last weekend. With all the rain and flooding lately there is always debris in the rivers and dams and the 422 took a couple of small hits recently.

Decided it was time to try the spare prop in case I was forced to use it. I hade to fab up a new puller as the standard c clamp prop puller was not getting the job done. Lapped the prop as per "Pete's Proper Prop Installation" thread. I sure would be nice to sticky these really useful threads somewhere so they are easier to find.

The 470 was up about 300rpm at boarding speed normally 22mph is 2400-2500rpm with the 422. With the 470 the rpm was 2700-2800rpm. At ski speeds it was worse 35mph 3800-3900rpm at 4600rpm we were only seeing 41-42mph. With the 422 I could not see 4600 rpm it would top out at 47.1mph gps at 4450-4500rpm.

It would be a good prop on a heavily loaded 89 but I did not feel that the pull was any better than the 422 4 blade. I think the 1442 would be better suited to this hull the extra diameter would keep the rpm down. I think it may have even pulled higher rpm but it was time to pull up and the revs and speed were increasing ever so slowly.

Fuel usage also increased with the extra rpms. I think adding a bit of extra cup would bring the rpm down not sure if it will be enough though.

Now that's what I call follow through.

Randy - you're quite the tease with that weather report! In the teens here in Iowa!

Tim,

Will do as soon as I get back on the water...right now I am removing the hardware in preparation for wetsanding.

Thanks,
Randy

Chris, Pete

Thanks for the tip, yes I bent the cotter pin around the center before I went to the lake.

Gang,

I went for test spin on Lake Butler today, this ACME 1442 prop rocks! Much better than the stock 14 x 16. The holeshot seems to be improved considerably and the top end is better than the old 14 x 16. Tim, Chris thanks for the advise, anyone who has not purchased one these for stock Ski w/1:23 transmission.....call today and place your order with Delta Propellers.

Randy

Randy - You might want to bend that straight tail of the cotter pin toward the center.

At least that is what I do to prevent it from fatiguing. I sense a couple of different views on this coming . . .

Randy love the colour of your 89 have not seen many yellow ones. I have a ACME 422 on my 89 and it performs very well and is super smooth. Even with the boat heavily loaded it has no problems getting onto plane. The 1.23 tranny has a lot to do with this though.
Tim did a lot of testing on his 90 SN and concluded the 3 blades out performed the 4 blade ACME's.
I like the idea of the extra diameter of the 1442.

Federal 13x13 - ACME 540 13x12

8122pbrainard wrote: Randy, Pull the Acme out of the box and take another picture of it and replace the picture you did post. It will give people a better idea of the surface area of the blades. When is it going in the water? I suggest you lap the new prop to the shaft. You joined in May of last year and I started this thread proper prop installation in February so don't know if you've seen it.

Pete you are right haha..when I first saw this picture I said..wait something is wrong there!! that props look like it came from the barber shop...its not even close to my 1442..then I noticed it was due to the package!!!

Randy,
Pull the Acme out of the box and take another picture of it and replace the picture you did post. It will give people a better idea of the surface area of the blades.

When is it going in the water?

I suggest you lap the new prop to the shaft. You joined in May of last year and I started this thread proper prop installation in February so don't know if you've seen it.

Tim, Chris

Thanks again for your advise, I opted for the ACME 1442, wow the surface area appears much larger when compared to the stock Federal propeller. See below. I highly recommend Delta Propellers; very courteous customer service and prompt delivery and they use very good shipping package.   Great discount, be sure to specify the DP5CCF08 CCFAN discount when ordering.

Stock Federal:


New ACME 1442:


Hopefully I can report back shortly the on the performance improvement.

Randy,

Getting the boat ready for St.Johns...

Hello, yes I was leary of that price also, and I did get the prop. Bill @ Acme knows me, and knows the company that is selling them, Bill says that they are selling them at ROCK BOTTOM prices ( near cost )

I am not going to guarantee you will not have any issues, but my transaction was very smooth, and yes I did confirm with Bill that it is a genuine ACME prop.

I went with this over the 1442 because of the cost, and I think it was a great decision, it was a night and day difference from the stock one.

Good luck!

Dan

Chris is right on- Id go with the 1442. Youll see a few more RPM (100-200) than the stock prop, but you'll still be under 4800. I would expect you to gain a ton of holeshot and probably a little bit of topend.

Mdvalant, theres no such thing as a 13x13 Acme for a Correct Craft- they dont make that size in RH rotation. Either way, that size is way off for the 1.23 transmission in question.

Not Tim but that won't stop me from giving advice.   I have both the 470 & 1442.    Unless you are using over 1000 lbs. of ballast, I recommend the 1442 - the rpms will be a little lower & you will use less gas.

Some one has a prop in the parts for sale section that may work, but I don't have experience with that.

I recommend Delta prop as the source. They are a site sponsor & give very good service.

PS - If you join the Planet Nautique website, then you can get a discount at Delta. I don't know why they don't offer it to us.