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Author Topic: Newbie question - 3 blade Prop  (Read 323 times)

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Medved

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Newbie question - 3 blade Prop
« on: May 20, 2021, 12:35:26 PM »

Looking to replace original 2 blade prop on the new to me 1988 C34 M25X diesel. So far the reading I have done here points to 15 - 10 prop. I am leaning towards a fixed blade prop as I heard/read issues with folding props not engaging when put in reverse. Curious what the group is using for both fixed and folding as far as brand, size, pitch, size of the blade (sailor thinner or regular larger blade).
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Ron Hill

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Re: Newbie question - 3 blade Prop
« Reply #1 on: May 20, 2021, 01:53:55 PM »

Med : The 15" diameter x 10" pitch is for the Sailor (thin blade) style fixed 3 bladed prop.  Once you go the a "thicker" 3 bladed fixed prop the pitch is UNKNOWN !!!!   :donno:

A thought
« Last Edit: May 20, 2021, 02:28:20 PM by Ron Hill »
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Noah

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Re: Newbie question - 3 blade Prop
« Reply #2 on: May 20, 2021, 02:13:58 PM »

NEVER had an issue with my 3 blade 15x10 Flexofold not opening. At full throttle forward it buries my sugar scoop stern a bit.
« Last Edit: May 20, 2021, 04:21:12 PM by Noah »
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1990 hull #1014, San Diego, CA,  Fin Keel,
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Stu Jackson

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Re: Newbie question - 3 blade Prop
« Reply #3 on: May 20, 2021, 03:18:59 PM »

April 2015  Haulout 6 (I'm up to 8 now).
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Stu Jackson, C34 IA Secretary, #224 1986, "Aquavite"  Cowichan Bay, BC  Maple Bay Marina  SR/FK, M25, Rocna 10 (22#) (NZ model)

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Jim Hardesty

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Re: Newbie question - 3 blade Prop
« Reply #4 on: May 20, 2021, 04:12:57 PM »

Quote
Curious what the group is using for both fixed and folding as far as brand, size, pitch, size of the blade

I have a 3 blade Maxiprop.  Never had a problem with blades engaging or feathering, it's been trouble free 15 seasons.  Motors at near hull speed.  I think of it as the best sail change I've made.  Disadvantage $$
Jim

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Jim Hardesty
2001 MKII hull #1570 M35BC  "Shamrock"
sailing Lake Erie
from Commodore Perry Yacht Club
Erie, PA

Medved

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Re: Newbie question - 3 blade Prop
« Reply #5 on: May 20, 2021, 04:34:44 PM »

April 2015  Haulout 6 (I'm up to 8 now).

What brand of prop is it? Again, newbie here :)
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Medved

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Re: Newbie question - 3 blade Prop
« Reply #6 on: May 20, 2021, 04:36:52 PM »

Quote
Curious what the group is using for both fixed and folding as far as brand, size, pitch, size of the blade

I have a 3 blade Maxiprop.  Never had a problem with blades engaging or feathering, it's been trouble free 15 seasons.  Motors at near hull speed.  I think of it as the best sail change I've made.  Disadvantage $$
Jim

Is this the one you have? I am assuming 15 diameter and 10 pitch? https://flexofold.com/folding-propellers/5-shaft-propellers/17-3-blade-shaft-folding-propeller/
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Noah

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Re: Newbie question - 3 blade Prop
« Reply #7 on: May 20, 2021, 05:28:21 PM »

I have a Flexofold as pictured. Jim has Max Prop.
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1990 hull #1014, San Diego, CA,  Fin Keel,
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Jim Hardesty

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Re: Newbie question - 3 blade Prop
« Reply #8 on: May 20, 2021, 05:32:49 PM »

wrong spelling for maxiprop

https://www.pyiinc.com/max-prop-easy.html

Jim

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Jim Hardesty
2001 MKII hull #1570 M35BC  "Shamrock"
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Stu Jackson

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Re: Newbie question - 3 blade Prop
« Reply #9 on: May 20, 2021, 05:56:51 PM »

April 2015  Haulout 6 (I'm up to 8 now).

What brand of prop is it? Again, newbie here :)

I don't know.  The PO, who owned the boat for 12 years when I bought her in 1998, removed (and saved) the OEM 2 blade.  Because someone mentioned the thickness of the blades in an earlier reply on this thread, I provided those three views so if anyone wanted to find out, they could.

My understanding is the two choices are Campbell or Michigan Prop.  I don't know which one mine is.

I raced with my "three pronged dragging bucket" quite successfully on SF Bay in the early OOs.  Of course, there was wind there!  Other places with lighter winds would make sense to consider feathering/folding.  I don't like moveable stuff I can't get to, but concerns about that issue seem to have been answered by those who have done the research and homework to make the decision.
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Stu Jackson, C34 IA Secretary, #224 1986, "Aquavite"  Cowichan Bay, BC  Maple Bay Marina  SR/FK, M25, Rocna 10 (22#) (NZ model)

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waughoo

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Re: Newbie question - 3 blade Prop
« Reply #10 on: May 20, 2021, 08:41:13 PM »

I have this funny shaped 3 blade.  It does a fantastic job burring the whole swim platform at full throttle on my mk1.5.  Unfortunately, I dont know anything about it other than its curious shape.  Anyone recognize it?

Given the opportunity and funds, I would LOVE a 3 blade maxprop.

****EDIT****  This works much better with the picture attached
« Last Edit: May 21, 2021, 07:48:51 AM by waughoo »
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Alex - Seattle, WA
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Medved

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Re: Newbie question - 3 blade Prop
« Reply #11 on: May 21, 2021, 03:01:47 AM »

I have a Flexofold as pictured. Jim has Max Prop.

Sorry, mixed them up. Noah, any advice on where to buy flexofold these days? I did some googling and did not see much.
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girmann

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Re: Newbie question - 3 blade Prop
« Reply #12 on: May 21, 2021, 03:37:08 AM »

I have a Flexofold as pictured. Jim has Max Prop.

Sorry, mixed them up. Noah, any advice on where to buy flexofold these days? I did some googling and did not see much.

Reach out to them directly. Earlier this year I got a quote for a Flexofold 3 blade. They said it would take 3 days to make it and 3 days shipping from Denmark to the East Coast of the US
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Noah

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Re: Newbie question - 3 blade Prop
« Reply #13 on: May 21, 2021, 06:43:59 AM »

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Analgesic

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Re: Newbie question - 3 blade Prop
« Reply #14 on: May 21, 2021, 11:03:07 AM »

So, after my 3 blade fixed 51 x 10 prop had a few too many digs, I did my research and just launched with my new Campbell Sailor 3 blade.  Very limited early feedback is that I easily motored at 6.5 knots without the engine (1988 21 hp Universal) racing (tach not accurate so not sure of rpms).  Brief broad reach sail in 4 knots apparent, genoa only had be moving at 3.2 knots in flat water, never would have happened with the old prop; and stopping was much slower at the mooring with significantly more pronounced prop walk.  I'm thrilled with the motoring result and reduced drag in light air and will certainly learn to deal with the mooring /dock approach changes. 
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Brian McPhillips
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