Boats For Sale:
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gun-driver 
Grand Poobah 
Joined: July-18-2008 Location: Pittsburgh, Pa Status: Offline Points: 4127 |
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 Topic: New PropPosted: August-13-2020 at 5:05pm |
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Yep 540 for the '86 2001 SN I ran a 1442 3 blade on my '95 SN GT-40 and now running it on my 2000 Sport and it gets the job done nicely slalom, wake-boarding and surfing.
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TRBenj
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Joined: June-29-2005 Location: NWCT Status: Offline Points: 21184 |
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Posted: August-13-2020 at 6:49am |
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Size and style of prop are more important than blade count. Often your choices are somewhat limited amongst all those criteria. Blade count will have less of an effect on proper rpm and resulting speed than the other design considerations. You are comparing prop models for 1:1 and 1.23:1 boats (varying by 3”+ pitch), they are apples and oranges. Would suggest a bit more learning before selecting one. |
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GottaSki
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Joined: April-21-2005 Location: NE CT Status: Offline Points: 3363 |
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Posted: August-13-2020 at 4:47am |
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We are addressing Ralph, as he started this post inquiry
Acme 540 |
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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slmskrs
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Joined: January-03-2012 Location: SF bay area, CA Status: Offline Points: 522 |
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Posted: August-13-2020 at 2:00am |
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Why is it a better prop than a 4 blade (ACME 422)? I like everything that my buddy's ACME 431 for his MC did; would love the same for my boat, but leery about what it would do to my wake vs the stock 4-blade. If it will make it softer, I'd go for it. My '96 had a 3-blade, and I tried a 4 blade twice at two different times and everyone thought the 3 blade was softer, so I stuck with it. But the '97 and newer all have 4-blade. I don't know that there is anyone that is going to let me try and buy a ACME540; if I don't like it, I get to return it for a refund.
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Gordon '97 Ski Nautique, GT40
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gun-driver
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Joined: July-18-2008 Location: Pittsburgh, Pa Status: Offline Points: 4127 |
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Posted: August-12-2020 at 1:38pm |
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ACME 540 3 blade... period
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slmskrs
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Joined: January-03-2012 Location: SF bay area, CA Status: Offline Points: 522 |
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Posted: August-11-2020 at 11:39pm |
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What he got was a somewhat stronger pull when pulling heavier skiers out of the water, and somewhat lower RPMs at 34.2 and 36mph than his 4-blade. He did lose 1-2mph on WOT, but on a tournament ski boat (slalom only) that never goes over 36, top end speed is not much of a concern.
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Gordon '97 Ski Nautique, GT40
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SNobsessed
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Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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Posted: August-11-2020 at 7:29am |
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I think 'hole shot' typically refers to the 'rate of change' RPM increase during take off, not the steady state RPM at low speed.
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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slmskrs
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Joined: January-03-2012 Location: SF bay area, CA Status: Offline Points: 522 |
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Posted: August-11-2020 at 1:49am |
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original prop was 4 blade, new prop 3 blade.
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Gordon '97 Ski Nautique, GT40
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slmskrs
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Joined: January-03-2012 Location: SF bay area, CA Status: Offline Points: 522 |
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Posted: August-11-2020 at 1:48am |
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It didn't make a lot of sense to me either; I know Bryan from Valley Prop is a big proponent of 3 blade over 4 blade. My buddy's MC had a 4 blade, and he got improved hole shot but lower RPMs on the higher end. Speeds were recorded at various RPMs (using PP RPM mode) on the old prop, and when my buddy got the new prop from Bryan and did the same tests over again, the hole shot was better (higher speed at specific RPMs on the low end), and lower RPMs on the higher end (30-36mph range).
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Gordon '97 Ski Nautique, GT40
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Jonny Quest
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Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2974 |
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Posted: August-10-2020 at 4:56pm |
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Better hole-shot and lower RPMs are typically somewhat mutually exclusive. For better hole-shot, most would look to a lower pitched prop — thus enabling the engine RPMs to climb faster into the “power band”. The lower or shorter pitch would translate into higher engine RPMs at a constant speed. Now, if your “base” prop was a non-CNC and poorly tuned or repaired, then you may be able to increase hole-shot amp RPMs concurrently.
JQ
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Current
2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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8122pbrainard
Grand Poobah
Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: August-10-2020 at 4:33pm |
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How did he do it? CNC prop after he was running a hand worked? Typically a better hole shot is by lowering the pitch but, that increases the RPM.
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slmskrs
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Joined: January-03-2012 Location: SF bay area, CA Status: Offline Points: 522 |
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Posted: August-10-2020 at 3:57pm |
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One other thing. My buddy wanted a better hole shot for big skiers, but wanted his overall RPM lower. Bryan was able to get him a perfect prop.
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Gordon '97 Ski Nautique, GT40
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Jonny Quest
Grand Poobah
Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2974 |
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Posted: August-09-2020 at 12:49pm |
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Delta Propellers has been a CCF site sponsor in the past
JQ
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Current
2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
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repifanio2
Groupie 
Joined: June-25-2017 Location: 53121 Status: Offline Points: 53 |
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Posted: August-09-2020 at 12:28pm |
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Thank you
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RKE
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slmskrs
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Joined: January-03-2012 Location: SF bay area, CA Status: Offline Points: 522 |
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Posted: August-09-2020 at 12:05pm |
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Valley Propeller Service Bryan 805.644.5055 Ventura, CA New Prop Sales, Computer Repairs, Inboard, Outboard, Sterndrive One of the members of our club (skis Big Dawg tourneys) recommended this place. Several of our members have used him. He is very knowledgeable and will work with you to find the best prop. One of my ski buddies who has a MC called him. Bryan had him provide speeds at certain RPMs, then recommended a 3-blade over his current 4-blade. He tried it and it the wake was as good or better than the 4-blade, and the RPMs were just where they wanted them. I believe it was an ACME prop. He also uses CNC for repairs. So far everyone has been happy with him. |
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Gordon '97 Ski Nautique, GT40
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Fabcon
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Joined: August-27-2012 Location: Buffalo. Mn Status: Offline Points: 554 |
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Posted: August-09-2020 at 12:02pm |
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Acme 540
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1976 Ski Nautique 351 Escort
1984 Barefoot Nautique (Parting Out) |
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repifanio2
Groupie
Joined: June-25-2017 Location: 53121 Status: Offline Points: 53 |
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Posted: August-09-2020 at 9:28am |
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Need to replace my prop for 1986 2001 correct craft. Any suggestions on size and maybe company to buy from?
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RKE
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GottaSki wrote: