I've owned 3 blade
Gori props and still have one as a spare. I now have Bruntons. I think Gori props are better backing up but they are a maintenance
headache and very complex. You have to replace 3 zincs on each prop and the collar zincs are not easy to do underwater. There is also a soft inner bushing that almost has to be replaced every time you haul. Most if not all of the folding props on sail drives have rubber bushings. The question is how often and how expensive it is to replace them.
Having said that Gori props are as gorgeous to behold as they are expensive and AB Marine
provides good service
One last word of caution regarding Gori props. Their Overdrive feature in my opinion puts undue stress on the dampening plate when going into it. To activate Overdrive you put the engine
in reverse and then shift rapidly to forward. The rapid shifting keeps the prop blades from reorienting themselves and you end up with a different pitch
going forward. The problem is this that by not pausing in neutral there is undue stress put on the dampening plate to absorb the shock of shifting rapidly. I had a dampening plate fail at 400hrs by shearing off all of the rivets holding it together. With a sail drive it is a major job to replace and I believe the failure was probably directly related to using the Overdrive feature.
In addition to the Yachting Monthly article, there are a number of other articles comparing props. Unfortunately they are too large to upload but here is some information that may help searching for them:
Folding Prop gear
test by Nigel Calder Australian Yachting May/June 2011
Prop Art - Segeln (German) Magazine 2008 - English
12 folding props - Voile Magazine Aprl 2009 - not translated but graphics make it easy to understand.
If you send me a private message with your email
address, I will email
them to you.