Cruisers Forum
 


Join CruisersForum Today

Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 19-05-2019, 17:38   #1
Registered User

Join Date: Apr 2019
Location: Fairhaven
Boat: Farrier 43x
Posts: 5
Most reliable feathering propeller

Our 45ft Farrier catamaran has lombardini saildrives and kiwi self feathering props. As per lots of forums weíre having reversing issues (I think partially caused by failed propspeed anti foul after 4 months).
Is there a genuinely reliable feathering propeller available for offshore cruising or should I be just sacrificing speed and noise and getting fixed props ?
Iíd love long term real boat tests
Any help would be greatly appreciated 🙏
__________________

Tumblewoods is offline   Reply With Quote
Old 19-05-2019, 18:13   #2
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 24,674
Re: Most reliable feathering propeller

I believe Autoprops to be reliable. Many years ago apparently a few spit blades, but that was long ago with a completely different design.
However as with anything you do have to maintain them.
__________________

a64pilot is offline   Reply With Quote
Old 19-05-2019, 18:27   #3
Registered User
 
fxykty's Avatar

Join Date: Apr 2016
Location: Auckland
Boat: Outremer 55L
Posts: 762
Most reliable feathering propeller

Our boat has had Max-Prop Easy (3 blade) since 2013. Weíve had the boat since 2017. Reverse is as effective as forward. The Max-Prop uses shaft torque via a differential gear to open the blades, so thereís no lag apparent when changing between forward and reverse.

But if you just think itís the Prop Speed causing problems with your existing feathering props (did the reverse rollers get painted?), clean it all off, ensure your props are properly greased, and just try manipulating the blades by hand. The Kiwiprop site has an independent report from 2009 that shows not so good in reverse. But is that important enough to go to the hassle and expense of changing props?
fxykty is offline   Reply With Quote
Old 19-05-2019, 18:54   #4
Registered User

Join Date: Feb 2015
Location: Ensenada
Boat: Chris White Voyager 48
Posts: 535
Re: Most reliable feathering propeller

We're satisfied with our Max Prop Classic 3 blade. Good forward and reverse.


Cheers,
__________________
Joe & Sue
S/V Presto
jdazey is offline   Reply With Quote
Old 19-05-2019, 18:56   #5
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,888
Re: Most reliable feathering propeller

Quote:
Originally Posted by a64pilot View Post
I believe Autoprops to be reliable. Many years ago apparently a few spit blades...
"A few..." Bwahahahaha!
fstbttms is offline   Reply With Quote
Old 19-05-2019, 18:58   #6
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,888
Re: Most reliable feathering propeller

Having installed and maintained many, MANY Max Props over the last couple of decades, my opinion is that the Classic is as reliable and robust a piece of equipment as you can install on your boat.
fstbttms is offline   Reply With Quote
Old 19-05-2019, 19:03   #7
Registered User

Join Date: Oct 2015
Posts: 1,397
Re: Most reliable feathering propeller

I have used Max Props on two boats for 15 years and well over 50K miles. Never once had a problem, and can't imagine what kind of problem they could have. The are solid and robust.

Autoprops do work and are a clever idea, but they tend to be much more sensitive to fouling. Since each blade needs to adjust its pitch separately, if one blade is fouled slightly more than the others it takes a different pitch, and vibration and poor performance results.

IMHO, Autoprops are MARGINALLY better for people who expect to motor a lot, and that is fine. Feathering props like the MaxProp are MARGINALLY better for people who expect to sail a lot, and that is fine too. The differences between the two are small. If I had a boat with a Maxprop I would never dream of switching to an Autoprop, and vis versa, no matter my sailing style.
billknny is offline   Reply With Quote
Old 19-05-2019, 19:11   #8
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 24,674
Re: Most reliable feathering propeller

Actually for those that motor a lot, nothing beats a well designed fixed prop.
The Autoprops sweet spot if you will is motor sailing. I find mine to not be as good in pure motoring, especially in beating into wind and waves as my fixed prop was, but in light winds or of Iím in a hurry, cranking the motor and just 1000 RPM will take me from five kts to over seven.
A feathering or fixed prop takes more than that to just equal boat speed.

Different tools
a64pilot is offline   Reply With Quote
Old 19-05-2019, 19:18   #9
Registered User
 
AndyEss's Avatar

Join Date: Dec 2016
Location: Sea of Cortez/northern Utah/ Wisconsin/ La Paz, BCS
Boat: Hans Christian 38 Mk II
Posts: 320
Images: 1
Re: Most reliable feathering propeller

My boat has had a MaxProp since some time in the 90's. I've had my boat for nearly three years now, and I learned how to drive an adjustable prop on her. My last boat was a two bladed fixed.
Let's say, my learning curve is fairly flat sloped i.e. long.
The prop is Still going strong.
AndyEss is offline   Reply With Quote
Old 19-05-2019, 19:24   #10
Registered User
 
Suijin's Avatar

Join Date: Feb 2013
Location: Annapolis MD; currently in Luperon DR
Boat: Valiant 40
Posts: 4,429
Re: Most reliable feathering propeller

Quote:
Originally Posted by a64pilot View Post
...but in light winds or of Iím in a hurry, cranking the motor and just 1000 RPM will take me from five kts to over seven.
A feathering or fixed prop takes more than that to just equal boat speed.

Different tools
That is strange. My Maxprop does very well motor sailing, certainly better than what you state.

I've been very happy with the Max Prop 3 blade classic I have. In particular, it's bite in reverse is ferocious which is great for Capt. Ron maneuvers pulling into slips and fuel docks in high winds and currents. The thing digs a hole in reverse, no doubt. It's very well machined and designed and with proper care should last a really long time.

If you're concerned about any prop failing to feather/fold due to growth, you should "exercise it" once a week or so if you're in a high growth area...just putting the boat in gear forward and reverse at the dock, or reverse at anchor, and run it for a minute. Helps keep the growth off but is not a complete cure.

Regarding PropSpeed, I've had it last years and I've had it fail in months. According to my research it's a matter of contamination of the primer and coating, which require very careful clean up and storage of the cans from application to application. A kit will do quite a few props, but as you get towards the end of the kit contamination can lead to coating failure in short order. It does not pay to buy and apply it yourself as a result. but neither does it pay to have a pro do it when they are getting down to the bottom of their cans.
__________________
"Having a yacht is reason for being more cheerful than most." -Kurt Vonnegut
Suijin is offline   Reply With Quote
Old 19-05-2019, 19:36   #11
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 24,674
Most reliable feathering propeller

You have not tried an Autoprop to compare it against.
The only reason an Autoprop works so well for motorsailing is that itís a variable pitch prop. It works by centripetal force driving the blades flat reducing pitch, and induced water flow driving the pitch to increase.
So that the thrust the prop will produce at the same RPM is the same regardless of boat speed, it functions as a CVT in a car does.

Any prop that has a fixed pitch setting is the same as driving a car with a single gear, so if you have excessive force against you your overpropped, and if your motorsailing, your underpropped.

It is sensitive to fouling, but a prop is easy to clean. Iíve never tried prop speed etc., I just scrape my prop every so often.

Reverse wise, nothing can match an Autoprop because the blades flip around and the leading edge of the prop is still the leading edge.
A normal prop blade when in reverse swaps leading and trailing edge so therefore it doesnít work as well in reverse.
The feathering props like a Maxprop work well in reverse as the blades are just flat plates, they have no aerodynamic profile or blade twist.
I canít find it in writing but itís my understanding that the Autoprop was designed as a prop for WWII as a prop that could get a landing craft off of the beach as itís just as effective in reverse as forward, assuming transmission ratios are the same.
This shows how it reverses
https://youtu.be/_pkrxZwI2_Y
a64pilot is offline   Reply With Quote
Old 19-05-2019, 19:54   #12
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 24,674
Re: Most reliable feathering propeller

Found it in writing.
It was a WWII design for landing craft.
https://kingpropulsion.com/autoprop/
a64pilot is offline   Reply With Quote
Old 19-05-2019, 20:22   #13
Moderator
 
Jim Cate's Avatar

Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 14,546
Re: Most reliable feathering propeller

Well, it depends somewhat on what you mean by "reliable".

Max props have a big fan club in the USA, and lots of users. However, if you search through the pages of CF, you will find numerous posts mentioning having their Max props rebuilt after only a thousand hours or so, due to wear in the gears or housings. The PYI folks do a good job of these rebuilds, but it ain't cheap, and it's kinda a nuisance having to send your prop off for rework.

On the other hand (and yes, this is a N of one), we put an Auto-Stream three blade feathering prop on our previous boat. When we sold the boat years later, the prop had over 4000 hours on it and NO perceptible wear. It's design included quick and easy in the water pitch adjustment, both Fwd and Rev, and underwater greasing access, also quick and easy. We never had a problem with feathering or reversing... it just worked, and with no fancy footwork when shutting down. A quick bang into rev after stopping the engine and it feathered instantly. As far as performance motoring, I think all feathering props, with their flat blades, are pretty similar in similar sizes.

So, if you meant long and trouble free service life when you said "reliability", I'd look beyond the Max. Ohhh.... the Auto Stream was quite a bit less expensive, too, at least in ~1995 when we bought it.

Jim
__________________
Jim and Ann s/v Insatiable II now lying Towlers Cove, in Broken Bay NSW for a while
Jim Cate is online now   Reply With Quote
Old 19-05-2019, 21:24   #14
Registered User
 
J Clark H356's Avatar

Join Date: Jun 2010
Location: Grand Rivers, KY
Boat: Hunter 2003 356 - Persistence
Posts: 586
Re: Most reliable feathering propeller

Iíve had a MaxProp 3 blade classic since new in 2003. I had it rebuilt in 2014 - 11 years and 1271 hours. Cost was around $750 including shipping. I havenít had anything else to compare it to, but have been happy with the MaxProp.
J Clark H356 is offline   Reply With Quote
Old 19-05-2019, 21:58   #15
Moderator
 
Jim Cate's Avatar

Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 14,546
Re: Most reliable feathering propeller

Quote:
Originally Posted by J Clark H356 View Post
Iíve had a MaxProp 3 blade classic since new in 2003. In 2014 - I had it rebuilt i years and 1271 hours. Cost was around $750 including shipping. I havenít had anything else to compare it to, but have been happy with the MaxProp.
Exactly the point i was addressing in my post above. To me, rebuild after only 1271 hours is not good reliability or service.

Other opinions may differ!

Jim
__________________

__________________
Jim and Ann s/v Insatiable II now lying Towlers Cove, in Broken Bay NSW for a while
Jim Cate is online now   Reply With Quote
Reply

Tags
propeller, rope

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale: Max-Prop Auto Feathering Propeller Rick01541 Classifieds Archive 8 14-05-2012 03:12
For Sale: Autoprop Self-Pitching, -Feathering Propeller Uncle Buck Classifieds Archive 21 01-08-2011 08:54
Can a machine / propeller shop "turn down" a 3 blade 15" feathering prop to be 14" Northeaster Propellers & Drive Systems 10 23-03-2009 09:17
Feathering Propeller Ex-Calif Propellers & Drive Systems 17 21-07-2007 15:28



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 00:50.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.