Prop help please !

[champ]

I was hoping someone could help identify this prop for me.
http://www.ebay.com/itm/251789779190...%3AMEBIDX%3AIT
Not sure if it is a ultra because it say's 14x25. and it does not say Volvo Penta either. A lot of money not knowing what it is.

[jl1962]

That's not an Ultra.

This is:
IMG_2838.JPGIMG_2839.JPG

What boat, engine, drive, prop etc... are you running now?

[champ]

My boat is a 1966 17' Champion with a ford 351 W motor. Volvo 270 outdrive. It came with a 14x22 ultra and my r.p.m.'s would rise to around 5,400. Last year I switched to a Solas Titan 3 Blade Stainless 15.63" dia. X 23" pitch CR and r.p.m.'s did come down to around 5100. A gps app on my phone showed I was just breaking 50 m.p.h.
The boat still jumps up on plane, handles and steers well but I think I could go faster maybe.
This prop on ebay somehow does not come up on any searches or cross reference and was curious as to if it was an ultra or even a Volvo Penta. What appealed to me was the pitch of 25 and what it may do for my boat.
Any advise on this ebay prop would be appreciated.
Below is pics of boat and old vs. new prop.

079.jpg025.jpg

[jl1962]

Hmmm
Would think a 23" Solas at 5100 rpms would yield more than 50mph.
Should be more like upper 50s/low 60s.
Do you know what drive ratio you have?

My '67 Ski Sporter ran mid/upper 50s w/ a 24" Ultra at about 5K rpm.
I would equate the 19" Solas w/ a 22" Ultra, a 21" Solas w/ 24" Ultra and a 23" Solas w/ a 26" Ultra in terms of HP required.

[champ]

The outdrive has a Holman Moody plate on it. I believe when I checked it before it was a 1:61. Also I was told in another post a 1966 holman ford came with a 289 c.i., because 302's were not made yet. Now with a 351 with a few performance mods there seems to be no lack in power.
I know this boat is heavy, but seems to me like it could go faster too. Does anyone think there could be too much slippage? Where would I check?
But again back to this prop on ebay. Could it be a deal or not?
http://www.ebay.com/itm/251789779190...%3AMEBIDX%3AIT

[jl1962]

That's the right ratio.

The other part that doesn't make sense is going from the 22" Ultra to the 23" Solas should've cost you more than 300 RPM.

What speeds were you seeing w/ the 22" Ultra?

Sorry can't help w/ the eBay prop.

[champ]

With the ultra and the only comparison speed wise, and that was with a jetski clocking me I was doing 45 m.p.h. . The solas is much bigger diameter and pitch, so that is why I thought to get more pitch, and go with this 25 that is on ebay. I did not even notice any loss of power jumping to plane between these two props, just more speed and a 300 r.p.m. loss.

[f_inscreenname]

I didn't think they made Ultra's in 25P? Thinking it was a 23 and rebent.

[champ]

it says' 14x25 on the prop and a weird part number sort of laser etched into it. It is close to a volvo part number but not matching any other numbers. Also Volvo Penta seems to be stamped into most of the props I have looked at.

jl1962

The other part that doesn't make sense is going from the 22" Ultra to the 23" Solas should've cost you more than 300 RPM.

What speeds were you seeing w/ the 22" Ultra?

.....so what would you expext the drop in r.p.ms. to be?

[jl1962]

Not sure.
I think one rule is 400rpm/2" of pitch.
But that's probably for similar props.

The 22" Ultra is a small 22" - small blades and lots of slip.
And the 23" Solas is a BIG 23" - big blades and lots of bite.

But people w/ 23" Solas in 18' Donzis and 350hp+ are running mid 60's.
So something doesn't make sense.

Wasn't able to see the pictures of your boat, but if it's what I think, those are cool!

[champ]

jl 1962,

The 22" Ultra is a small 22" - small blades and lots of slip.
And the 23" Solas is a BIG 23" - big blades and lots of bite. But people w/ 23" Solas in 18' Donzis and 350hp+ are running mid 60's.
So something doesn't make sense.

Kinda what I am reaching for. I may be off on my rpm's of 100, maxing out at 5000 because that was my target number and that is what I was thinking too, that I should be going faster.


076.jpg078.jpg

[Ghost]

That seems awfully slow and/or like a lot of slip. Any chance the tach is wrong? Like, it was set up for a 6-cyl maybe? That could put your rpm down at 3900 ish with slip down closer to 5 percent.

For or you folks who know those props, where would you guess the slip would be when wide open at 50mph in a small/light boat like that?

[champ]

Thanks Ghost for posing the question for me.

For or you folks who know those props, where would you guess the slip would be when wide open at 50mph in a small/light boat like that?

I think the tach is on, and I do feel some slip in the driveline sometimes, if that is what your question pertains to. It's truly sad to hear the words 'awfully slow', cause I really think this boat could do much more.

....so as far as this prop question goes, I bought it. Don't know if I am happy about it yet as it seemed pricey. I thought some on here may of had an interest too and wanted them to have a chance. I would still like to get any input as to if any one has seen on like this before. Very Rare as told to me from the Prop Shop at Michigan Wheel. They even called Volvo Penta for me, they just said it's theirs and is a 14x25 Left Hand Long Hub that has been out of production for a long time.
http://www.ebay.com/itm/251789779190...%3AMEBIDX%3AIT

[yeller]

Hmmm
Would think a 23" Solas at 5100 rpms would yield more than 50mph.
Should be more like upper 50s/low 60s.
Do you know what drive ratio you have?

My '67 Ski Sporter ran mid/upper 50s w/ a 24" Ultra at about 5K rpm.
I would equate the 19" Solas w/ a 22" Ultra, a 21" Solas w/ 24" Ultra and a 23" Solas w/ a 26" Ultra in terms of HP required.

If you hit upper 50's and had a 1:50 drive, and his drive is 1:61 like he thinks it is, then 50mph would be about right.

[Ghost]

For clarity, I only meant 'awfully slow' in the context of the rpm, gears, pitch.