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Go Back   SailNet Community > On Board > Gear & Maintenance > Folding vs Feathering Prop - views requested
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Thread: Folding vs Feathering Prop - views requested Reply to Thread
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Topic Review (Newest First)
02-09-2011 09:18 AM
dantaden Thanks everyone for your experience and advise. In the end I decided to on a GORI 3 blade folding prop from AB Marine and after a season in service I am very happy with the additional speed under sail. Under power, the over drive feature is great getting around 6-6.2 knots @ 1500 RPM on my 72hp Mercedes Diesel.

Have emailed AB Marine on a couple of accassions to enquire about blade size but no response - perhaps an indicator for future service performance ?

All in all, very happy with my GORI prop.
02-07-2011 11:44 AM
DwayneSpeer
folding

I have a folding prop. It works well. What can I say!
02-05-2011 02:00 AM
Nelsoncw I have an Autoprop on my Catalina 42. AB Marine had rebuilt the prop in 2007. In May of 2009 and 225 hours later a blade came off. Buntons Marine replaced the blade for $1500. I had it lubricated every six months. I am always in deep water. It never touched anything but saltwater. I only go to Catalina and back. Other than the lost blade there was not any evidence of damage or distress.

At the time Steve Armitage of AB Marine told me that losing a blade was a rare occurrence and that he did not have an explanation for why the blade fell off. David Sheppard of Brunton's Propellers Ltd, told me losing a blade is an “an exceptional case”. Contrary to their comments the prop has been subject to a recall for lost blades. If you search other support groups and blogs you will find many others that have lost Autoprop blades. It demeans their credibility to say otherwise.

Although I enjoy the performance of my Autoprop my experience with AB Marine and Brunton's Propellers has been extremely disappointing. They are unwilling to stand behind their product. In all their replies I feel like I am hearing from a politician trying not to give a straight answer.
01-15-2010 02:01 PM
Fstbttms
Quote:
Originally Posted by Gene T View Post
However, I watched the this prop come apart and go back together. I would like to know how you can properly lubricate all the different pieces while under water.
That particular prop requires no lubrication.
01-15-2010 01:57 PM
Gene T
Quote:
Originally Posted by Fstbttms View Post
Not true, Gene. There is almost no service to any prop, folding, feathering or fixed, that cannot be done underwater by a knowlegable diver with the right tools. Including installation or removal.
I will probably test you someday when I bring the boat back to SF Bay. You used to service my old boat in Alameda and I have a lot of respect for your work.

However, I watched the this prop come apart and go back together. I would like to know how you can properly lubricate all the different pieces while under water.
01-15-2010 01:04 PM
Fstbttms
Quote:
Originally Posted by Gene T View Post
Service under water looks to be impossible with lots of pins, shims and set screws. Gears will be prone to getting jammed up with marine growth requiring frequent diver attention. Time will tell but I would rather have a Max.
Not true, Gene. There is almost no service to any prop, folding, feathering or fixed, that cannot be done underwater by a knowlegable diver with the right tools. Including installation or removal.
01-14-2010 12:18 PM
Gene T I'm jumping into this discussion a little late but thought I would add some pictures of a Martec. This came with my new (to me) boat. It powers well, reverse is OK but I don't have much experience with it yet. It looks too complicated to me. Service under water looks to be impossible with lots of pins, shims and set screws. Gears will be prone to getting jammed up with marine growth requiring frequent diver attention. Time will tell but I would rather have a Max.


01-13-2010 02:03 PM
svsirius
Quote:
Originally Posted by lancelot9898 View Post
Oh...One other thing is that I'm not sure about the best way to "lock" the shaft with the max prop. For years I just shut down the engine and left the tranny in neutral, but now I'm shutting down when in forward and then putting it in reverse thinking that maybe there is more friction on the shaft allowing the max prop to feather better. (borg warner velvet drive) ??
We have been using the zirc fittings to re-grease [even underwater] and they work great.

Also regarding feathering the prop, the best practice to my knowledge is to stop the engine with the trans in neutral and then once the engine is stopped move the trans to reverse. Once the prop is feathered we put ours back in neutral. The shaft should not be spinning at all at this point.
01-13-2010 12:37 PM
Zanshin I like the Gori on my boat and there is no noticeable prop walk and the "overdrive" setting makes motorsailing or motoring in calm seas a lot more efficient, at 2000rpm I hit 6-7 knots and very little diesel usage.
On the downside, I have had 2 run-ins with lines in the water, once a thick fishing trap and another time last month I ran over my own dinghy painter. In both cases the rope cutter did an admirable job of cutting away the rope remnants but in both cases the Gori was partially fouled and unbalanced and wasn't fully functional until I dove on it and removed the blockage.
01-13-2010 10:29 AM
lancelot9898
Quote:
Originally Posted by svsirius View Post
1] delta in speed between the two was less than 0.1 knots in light air which is where the difference in drag will make the most difference. boat was a Frers 36 with a PHRF rating of 90.

2] Since then have installed a 3 blade max prop on the Moody and would never consider another solution. there is a reason everyone compares to the Max Prop. With regard to adjusting pitch without disassembly they do offer a version that allows that [costs more]. We elected not to go with that model and to this day not sure whether that was correct choice or not. We have the prop slightly over pitched on purpose [higher speed/lower RPM] but our engine is oversized for the boat so this is not an issue. It would be nice at times to be able to jump in and either reduce or increase pitch depending on whether we are passage-making or just local sailing where less pitch would give us less prop walk.

There is no perfect solution, however the service / support we have always received from PYI was great.
I also have the max prop on my Tayana 37 and have experienced no problems for over 20 years. I haul out every 3 years and repack the hub and recoat the prop. Takes about a full day doing that and while max prop offers a zirc fitting for relubbing the hub, the disassembly allows me to remove all the old grease and repack with new. It's a hassle, but every three years is something I can live with. The major time consumtion is recoating the prop which has held up well with proper underwater primer and hard bottom paint even though using a copper botttom paint is not recommended by max prop. I think the key is proper priming. As far as performance, I don't think there is much difference unless in light air. And that is certainly an advantage. The motoring effenciency is less with a max prop vs a fixed due to the flat vs a curved blade. The max prop also allows setting to a different pitch although once set it remains constant unlike I believe the auto prop changes with speed which is more efficient. I've got the prop set at a pitch of around 14 inches(17 inch diameter) and my WOT setting is less than the Perkins is cabable of achieving in neutral. There has been much discussion on this on other threads. One last comment is that the WOT rpm varies depending on whether the boat is in a current or not, but I've yet to really test that assertion. Passing under a draw bridge with high currents is not the time to be experimenting. Oh...One other thing is that I'm not sure about the best way to "lock" the shaft with the max prop. For years I just shut down the engine and left the tranny in neutral, but now I'm shutting down when in forward and then putting it in reverse thinking that maybe there is more friction on the shaft allowing the max prop to feather better. (borg warner velvet drive) ??
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