Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 13-05-2015, 12:41   #1
Registered User

Join Date: May 2015
Posts: 1
Gori props

Does any body have experience with gori props.
We are considering add a new gori prop last quote costing approx $7000
But we would save on 1000 nautical m trip 1/3 tank of fuel ( approx 400 l ) and add extra 2 knots speed on sailing plus no wear on prop shaft while sailing.
We have steel Roberts 44 sloop powered by 120 h p Yanmar.

Cheers Mark
__________________

__________________
Kia Orana is offline   Reply With Quote
Old 13-05-2015, 13:39   #2
Registered User

Join Date: Apr 2013
Posts: 4,889
Re: Gori props

I think you are hearing a lot of hype. I seriously doubt you will get significantly better fuel economy while motoring (certainly not 1/3 less fuel used). Fixed props are the best option while motoring.

Most folks talk about gaining 0.5-1.0kts with folding props.
__________________

__________________
valhalla360 is offline   Reply With Quote
Old 13-05-2015, 14:29   #3
cruiser

Join Date: Jan 2012
Location: Ocean Springs, MS
Posts: 279
Re: Gori props

Catamaran, two engines, two-blade folding Gori props. Very pleased with the products. At least a knot faster under sail, maybe more, when folded. Have good thrust both forward and reverse under power.

Boat came with Gori, and if they ever need replacing, they'll be replaced with Gori.
__________________
jaybird1111 is offline   Reply With Quote
Old 13-05-2015, 18:50   #4
Registered User

Join Date: Apr 2013
Posts: 4,889
Re: Gori props

Don't get me wrong. I don't think they are bad just that the numbers quoted in the original post seem wildly optimistic.
__________________
valhalla360 is offline   Reply With Quote
Old 13-05-2015, 20:03   #5
Registered User
 
leftbrainstuff's Avatar

Join Date: May 2011
Location: San Francisco and Australia
Boat: Liberty 458
Posts: 1,979
Re: Gori props

The fuel savings under power seem far fetched. We have a maxprop and see 0.5 knot or more improvement in boat speed undernsail when feathered. Lots of bite in reverse too compared to a fixed prop.

Sent from my SM-N900T using Cruisers Sailing Forum mobile app
__________________
leftbrainstuff is offline   Reply With Quote
Old 13-05-2015, 22:22   #6
Senior Cruiser
 
senormechanico's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 5,834
Re: Gori props

I've had fixed, then Max Prop on a previous boat.
Obvious improvement.
On my current boat which came with a Gori 2 blade, I replaced it with a Varifold 2 blade.
I took careful speed/rpm tests in flat water, no wind no current before and after the change and got the same cruising speed at 15% less rpm. Max throttle rpm is the same right at the peak recommended by the engine manual.
__________________
Memento,homo, quia pulvis es, et in pulverem reverteris.
senormechanico is offline   Reply With Quote
Old 14-05-2015, 04:46   #7
Registered User

Join Date: Apr 2013
Posts: 4,889
Re: Gori props

Quote:
Originally Posted by senormechanico View Post
I took careful speed/rpm tests in flat water, no wind no current before and after the change and got the same cruising speed at 15% less rpm. l.
If you are running a higher pitch, the RPM may go down a bit but that doesn't mean you are buring less fuel if the engine is running at a higher torque.
__________________
valhalla360 is offline   Reply With Quote
Old 14-05-2015, 10:19   #8
Senior Cruiser
 
senormechanico's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 5,834
Re: Gori props

True, but there's less vibration and almost 1 knot higher top speed as well.

Both tests were with smooth clean bottom.
__________________
Memento,homo, quia pulvis es, et in pulverem reverteris.
senormechanico is offline   Reply With Quote
Old 14-05-2015, 10:38   #9
Registered User
 
Zanshin's Avatar

Join Date: Feb 2007
Location: Caribbean
Boat: Jeanneau 57
Posts: 1,621
Re: Gori props

I had a Gori propeller on my Jeanneau 49DS and loved the system. If I wanted to motorsail or motor in settled conditions I'd get the prop into "overdrive" mode and run at much lower engine revs for the same speed. This really gives enormous fuel savings when motorsailing.

The downside is that it is possible to overheat the engine when in overdrive. I did this once by mistake when I was trying to get to Falmouth Harbour in Antigua before dark. I decided to install what all trucks have - an engine gas exhaust temperature gauge. This would let me run the Gori in overdrive mode and use the exhaust gas temperature to get the perfect load factor. I had the system spec'd out from VDO but then ended up selling the boat. I still have my page about the Gori at https://www.sv-zanshin.com/zanshini/zanshinigori.php

My next boat already had a folding propeller system, otherwise I would have immediately gotten another Gori.
__________________

__________________
-Zanshin (SV Zanshin)
Zanshin 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
Gori props - wobble c.spots Propellers & Drive Systems 1 08-02-2014 01:21
PropSpeed Coating on Gori Props Roy M Propellers & Drive Systems 29 31-03-2013 14:25
Want To Buy: Looking for Two Gori 16 x 13 Folding Props vientoman Classifieds Archive 1 22-09-2011 00:06
gegroves-Gori prop????? delmarrey Propellers & Drive Systems 29 11-11-2006 15:41
Vibration fwd gear problem 2 blade gori prop 737flyboy Engines and Propulsion Systems 5 11-01-2006 17:28



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 02:10.


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.