I replaced a Martec with a two blade fixed, and a folding two blade gori. I like the Gori, it works great, have no issues stopping the boat. I read that same article about the 3 blade gori and this did not support my own experience with the two blade, which was superior to the martec and at least the equal of the fixed. (which was a different pitch and slightly larger in diameter) .
I have been reading the posts about prop walk with some interest. I dock Windstar single handed a lot and prop walk is really not a problem for me, though when forced to think about it, there is l a slight tendency to pull to port when using reverse + throttle to stop. Docking port-side-to is so mildly preferred as to be academic. Not sure if this is the prop itself, or the centre-line prop shaft. Will try some precision backwards driving for the marina audience next season! Some photos comparing the Gori to the Martec it replaced. Photos do not do justice to the impressive bronze sculpture that is the Gori, (looked great on my desk at the office) nor is the dried blood clearly visible. (It does have some sharp edges that are exposed when disassembled.) http://cncwindstar.blogspot.ca/2016/10/gori-2-blade-prop.html Dave 33-2 Message: 4 Date: Mon, 24 Oct 2016 16:30:35 -0400 From: Michael Brown <m...@tkg.ca> To: cnc-list@cnc-list.com Subject: Message-ID: <4165664143-15...@mail.tkg.ca> Content-Type: text/plain; charset="utf-8" The Gori did poorly, though note it was a three blade folding. Also Gori spec'd the wrong size of prop according to a note at the end of the article. It is a good article but I noted that most of the props stopped from 6 kts in 8 - 10 seconds, the majority of them did 6.4 - 6.65 kts ahead. For me the biggest differences would be in prop walk from 9 to 16%, nearly 70% more prop walk force. Overall the Flex-O-Fold 2 blade looks to be a good choice. The Gori 2 blade physically is very similar to the Flex-O-Fold. Anyone have experience testing those two against each other? Michael Brown Windburn C&C 30-1 From: "Nauset Beach" <nausetbe...@optonline.net> ? Mike, Several people on the list have retired their Martec props for the very reason you cite: very poor reverse performance. ?Many have changed to 2 blade Flex-O-Fold geared props and the difference in reverse is dramatic. ? Take a look at a prop test article from Yachting Monthly in the UK that Flex-O-Fold posted on their website at this link: http://www.flexofold.com/upload_dir/docs/Test_YachtingMonthly_low.pdf The Gori did not rank very well. ? I believe everyone who has switched to a Flex prop has been happy, once they get the pitch correct. ?I was initially spec'ed a 16 Diameter x 13 Pitch to replace a 16 x 14 Martec,. ?That was too much pitch and was getting severe cavitation / vibration. ?Now I have a 16 x 12 with better performance and very little vibration. ? Brian
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