Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 07-02-2008, 06:05   #1
Registered User

Join Date: Jan 2007
Location: Cascais Portugal
Boat: Beneteau 393 PedrasI
Posts: 13
Max-prop versus Foldable

I have a Beneteau 393 Oceanis with a 3 blades Foldable from Volvo. On reverse it is very difficult to maneuver. In that the blades will not open to the maximum diameter, the reverse power is very poor
Same friends recommend buying a 3 blade max-prop.
There is somebody with any experience concerning those 2 type of propellers.

TKS for your opinion

Regards

C. Bleck
Portugal

__________________

__________________
Bleck is offline   Reply With Quote
Old 07-02-2008, 08:06   #2
Senior Cruiser

Cruisers Forum Supporter

Join Date: Jul 2006
Location: Chesapeake Region and Maine
Boat: 42' Bob Perry sloop
Posts: 4,038
Images: 4
MaxProps are extremely robust. I have had a 3-blade model for the past 17 years fitted to my 42' sloop. It has EXCELLENT power and control in reverse. In forward, it's just about the same as the 3-blade fixed prop I replaced.

My vote, based on my own experience and that of hundreds (thousands?) of others is to go with a MaxProp. They are costly, but you can fit it and forget it.

Bill
__________________

__________________
btrayfors is offline   Reply With Quote
Old 07-02-2008, 11:18   #3
Senior Cruiser
 
colemj's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Location: Presently on US East Coast
Boat: Manta 40 "Reach"
Posts: 10,049
Images: 12
I can't comment on the Max prop, but it sounds like something is wrong with your folding prop. We have the same Volvo 3-blade props on our boat, but they open fully in reverse and we have a lot of power. Is something inhibiting their opening? Ii seems that if they won't open fully in reverse, they shouldn't be opening fully in forward either.

Mark
__________________
colemj is offline   Reply With Quote
Old 07-02-2008, 12:26   #4
Moderator Emeritus
 
David M's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: San Francisco Bay
Boat: research vessel
Posts: 10,150
I bet if you Googled a comparison of the two, somebody, somewhere has already done a comparison.
__________________
David

Life begins where land ends.
David M is offline   Reply With Quote
Old 07-02-2008, 13:31   #5
Senior Cruiser

Join Date: Apr 2006
Posts: 2,453
I agree with Btrayfors - I've got a maxi on my 43' Endeavour Ketch - As long as I have fuel, I have great control in either direction.
__________________
S/V Elusive is offline   Reply With Quote
Old 07-02-2008, 13:54   #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: 3,594
Quote:
Originally Posted by Bleck View Post
In that the blades will not open to the maximum diameter, the reverse power is very poor
Why are the blades not opening fully? Maybe paying a diver to do an inspection (including watching the prop while you shift from foward to reverse) would be helpful.
__________________
fstbttms is offline   Reply With Quote
Old 07-02-2008, 14:04   #7
cruiser

Join Date: Aug 2005
Location: No longer post here
Boat: Catalac Catamaran
Posts: 2,462
MIT Propeller Study

Here's the MIT propeller study which compares the Max Prop performance to competitors and fixed propellers.

MIT Propeller Study

Hope this helps
__________________
Tropic Cat is offline   Reply With Quote
Old 07-02-2008, 18:27   #8
Moderator Emeritus
 
David M's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: San Francisco Bay
Boat: research vessel
Posts: 10,150
Interesting study. Its old (1994) but the physics have not changed.
__________________
David

Life begins where land ends.
David M is offline   Reply With Quote
Old 08-02-2008, 04:23   #9
Moderator Emeritus
 
Ex-Calif's Avatar

Cruisers Forum Supporter

Join Date: May 2007
Location: Singapore
Boat: Maxi 77 - Relax Lah!
Posts: 11,514
Images: 4
We have a smaller boat (27 feet) that had a 10ho Volvo, saildrive and original folding prop. We replaceed the folding prop with a max prop and it was undeniably the best thing we have ever done to the boat.

The folding prop has to work in forward and it has to rely on centrifugal forces in reverse. Bottom line is that it is a compromise.

We used to get 3.5 knots in forward and marginal performance in reverse. Around here we sometimes can get 1.5 knots current during flood tides.

Now we get 5.5-6 kts in forward and reversing is like throwing out an anchor. Reverse performance is almost as good as forward.

Do it - You won't regret it.
__________________
Relax Lah! is For Sale <--- Click
Click--> Custom CF Google Search or CF Rules
You're gonna need a bigger boat... - Martin Brody
Ex-Calif is offline   Reply With Quote
Old 02-08-2014, 16:10   #10
cruiser

Join Date: Aug 2005
Location: No longer post here
Boat: Catalac Catamaran
Posts: 2,462
Re: MIT Propeller Study

Quote:
Originally Posted by Tropic Cat View Post
Here's the MIT propeller study which compares the Max Prop performance to competitors and fixed propellers.[/URL] ...
This page has been moved to

Propeller Drag under sail, Article
__________________

__________________
Tropic Cat is offline   Reply With Quote
Reply

Thread Tools
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
16" 3 blade Max Prop on ebay froggman180 Classifieds Archive 3 24-10-2007 22:39
Handheld chartplotter for CMap Max southernman Marine Electronics 2 21-07-2007 15:00
Jabsco PAR MAX water pump coot Product or Service Reviews & Evaluations 1 15-05-2007 08:34
Max Charge 612 Problems Leighton Electrical: Batteries, Generators & Solar 6 07-02-2007 19:52
Max Air michael201 Fishing, Recreation & Fun 3 04-11-2006 14:48



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 20:59.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.