Folding props without locking the transmission?

tburgess · 05-04-2008, 14:50

Hey folks, I have a 3 blade folder prop (gori) and would like to hear how other's with folding props (gori or other) manage "freewheeling" while sailing. On my last boat I had a Max prop (feathering). I was able to feather the prop by shutting the engine down in forward. This alloiwed me to avoid locking my transmission in reverse. The last boat was a mono hull with a shaft, the new boat is a multi with saildrives. Locking my engines in reverse folds the props and stops freewheeling but the Yanmars get stuck in reverse even though I shift back to neutral. This causes starting problems after we sail for a while. I confirmed this starting problem (transmission locked in reverse) with Mack Boring but they are not offering any good alternatives to help fold the props.

Nordic cat · 05-04-2008, 15:05

I have Volvos, but just reverse the gear once the engine is shut off. This closes the props, the back to neutral. Never noticed any problem, as the props shouldn't open, and haven't as far as I know.

Nice video on your site BTW, hoping to see some more sailing stuff, a lovely boat. Is she built at Bongers?

Regards

Alan

tburgess · 05-04-2008, 18:24

Thanks. Yes, Zen is a Bongers boat. Hull number 2. Some friends of ours are currently having number 3 built at a new SA yard.

I have done the same, pop them in reverse and then back to neutral, but they start spinning after a while and I need to keep dropping them into reverse. What I've found is that ever so often (more often then not) the tranny locks in reverse and the starter can't spin the engine when it is time to start em up again. Not sure there is much I can do. I keep asking just to see if anyone has a secret method I have not thought/heard of.

senormechanico · 05-04-2008, 21:03

Same here. I've got a Gori 2 blade folder with a MD2020 Volvo. I shut down the engine, momentarily hit reverse, and go to neutral. I've never had the prop freewheel after that procedure.

I can't help wondering if you have a worn propeller blade gear or loose blade pin.

Steve B.

Nordic cat · 06-04-2008, 05:21

I suggest you drop the Gori folks a line and ask their opinion, this doesn't sound right.

Here are the details for the factory:

Contact:
Gori propeller A/S
Address:Lysbjergvej 11
Hammelev
DK - 6500 Vojens
DenmarkPhone:+ 45 73 52 53 54
Fax:+ 45 73 52 53 55
Email:mail@gori-propeller.dk

Regards

Alan

tburgess · 06-04-2008, 06:15

Props are in great shape. Only a couple years old and I had them off 4 months ago for service to the saildrive. Everything looked good. I'm starting to wonder if they are spinning in folded position. I need to try and get a view of them underway, while spinning.

2Hulls · 06-04-2008, 10:06

Guess I'm doing something wrong. Here's my procedure: put transmission in neutral, stop the engine. My Volvo folders have never stayed open as far as I know.

Dave

fastcat435 · 07-04-2008, 13:36

Hallo T Burgess
I shut my motor down (Yanmar) while still in forward and the 3 blade goris close immediately and already for 4 years without a problem.
Greetings

Gideon

tburgess · 07-04-2008, 15:04

Gideon,
Thank you. This is the only thing I have not yet tried. I will try it asap.
-Tom

**btrayfors** · 07-04-2008, 15:22

Have had an 18" 3-blade MaxProp on my boat for 17 years. Never had the need to lock the transmission, or leave it in gear. My shaft does not turn when sailing. Perkins 4-108 with Paragon transmission and Walter V-drive.

A feathering prop should do just that: when the boat is moving forward, the blades should feather, so that there's virtually no turning motion on the shaft.

Bill

tburgess · 07-04-2008, 15:30

Bill,
Thanks for the info. I had a Perkins 80hp (can't remeber the model) with straight shaft and max prop in my old 50 foot sloop. I had no probs over more than 10,000 cruising miles. I shut the engine down in forward and all was fine. My current boat sails a bit faster and it seems to be causing issues with the prop spin. In fact, I think the props may be spinning while folded. I need to try and spy the props while underway but it is a bit trcky at 10+ kts. It's a work in progress.
-T

fastcat435 · 07-04-2008, 21:58

Hallo Bill there are rpm counters for sale that will work if set to the top of your sail drive to see if they turn or not they feel the vibration around 80 usd from taiwan
but especcillaly in your very fast cat there should be a notable difference in speed between turning or not

tburgess · 08-04-2008, 04:39

Thanks but there is no doubt they are spinning I just can't determine if the props are folded or not. I'm off the boat for a couple months. Will know more when we move back aboard.

Joli · 08-04-2008, 07:34

If they are spinning they are opening. Maxprop advise to shut down the engine while in forward to assure the props are feathered. If you shut it down in neutral the prop can index into the reverse postition and then it will freewheel.

When we used the Martec folders we always alligned the shaft so the prop was horizontal and one blade would not flop open, we then locked the tranny in reverse. Nothing spun.

05-04-2008, 14:50	#1
tburgess Registered User Join Date: Apr 2008 Location: Antigua Boat: Atlantic 48 Posts: 12	Folding props without locking the transmission? Hey folks, I have a 3 blade folder prop (gori) and would like to hear how other's with folding props (gori or other) manage "freewheeling" while sailing. On my last boat I had a Max prop (feathering). I was able to feather the prop by shutting the engine down in forward. This alloiwed me to avoid locking my transmission in reverse. The last boat was a mono hull with a shaft, the new boat is a multi with saildrives. Locking my engines in reverse folds the props and stops freewheeling but the Yanmars get stuck in reverse even though I shift back to neutral. This causes starting problems after we sail for a while. I confirmed this starting problem (transmission locked in reverse) with Mack Boring but they are not offering any good alternatives to help fold the props.

05-04-2008, 18:24	#3
tburgess Registered User Join Date: Apr 2008 Location: Antigua Boat: Atlantic 48 Posts: 12	Thanks. Yes, Zen is a Bongers boat. Hull number 2. Some friends of ours are currently having number 3 built at a new SA yard. I have done the same, pop them in reverse and then back to neutral, but they start spinning after a while and I need to keep dropping them into reverse. What I've found is that ever so often (more often then not) the tranny locks in reverse and the starter can't spin the engine when it is time to start em up again. Not sure there is much I can do. I keep asking just to see if anyone has a secret method I have not thought/heard of. Last edited by tburgess; 05-04-2008 at 18:52.

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05-04-2008, 15:05	#2
Nordic cat Registered User Join Date: Jan 2008 Location: Denmark Boat: FP Tobago 35 Posts: 601	I have Volvos, but just reverse the gear once the engine is shut off. This closes the props, the back to neutral. Never noticed any problem, as the props shouldn't open, and haven't as far as I know. Nice video on your site BTW, hoping to see some more sailing stuff, a lovely boat. Is she built at Bongers? Regards Alan

05-04-2008, 21:03	#4
senormechanico Registered User Join Date: Aug 2003 Location: Whidbey Island WA Boat: Dragonfly 1000 trimaran Posts: 810	Same here. I've got a Gori 2 blade folder with a MD2020 Volvo. I shut down the engine, momentarily hit reverse, and go to neutral. I've never had the prop freewheel after that procedure. I can't help wondering if you have a worn propeller blade gear or loose blade pin. Steve B.

06-04-2008, 05:21	#5
Nordic cat Registered User Join Date: Jan 2008 Location: Denmark Boat: FP Tobago 35 Posts: 601	I suggest you drop the Gori folks a line and ask their opinion, this doesn't sound right. Here are the details for the factory: Contact: Gori propeller A/S Address:Lysbjergvej 11 Hammelev DK - 6500 Vojens DenmarkPhone:+ 45 73 52 53 54 Fax:+ 45 73 52 53 55 Email:mail@gori-propeller.dk Regards Alan

06-04-2008, 06:15	#6
tburgess Registered User Join Date: Apr 2008 Location: Antigua Boat: Atlantic 48 Posts: 12	Props are in great shape. Only a couple years old and I had them off 4 months ago for service to the saildrive. Everything looked good. I'm starting to wonder if they are spinning in folded position. I need to try and get a view of them underway, while spinning.

06-04-2008, 10:06	#7
2Hulls Registered User Join Date: Oct 2007 Location: Chesapeake Bay Boat: Catana 471 Posts: 311	Guess I'm doing something wrong. Here's my procedure: put transmission in neutral, stop the engine. My Volvo folders have never stayed open as far as I know. Dave

07-04-2008, 13:36	#8
fastcat435 Commercial Vendor Join Date: Jul 2007 Location: Amstelveen Netherlands Boat: FastCat 455 Green Motion Posts: 1,211 Images: 4	Hallo T Burgess I shut my motor down (Yanmar) while still in forward and the 3 blade goris close immediately and already for 4 years without a problem. Greetings Gideon

07-04-2008, 15:04	#9
tburgess Registered User Join Date: Apr 2008 Location: Antigua Boat: Atlantic 48 Posts: 12	Gideon, Thank you. This is the only thing I have not yet tried. I will try it asap. -Tom

07-04-2008, 15:22	#10
btrayfors Moderator Site Helper Join Date: Jul 2006 Location: Chesapeake Region Boat: 42' Perry sloop, "Born Free" Posts: 872	Have had an 18" 3-blade MaxProp on my boat for 17 years. Never had the need to lock the transmission, or leave it in gear. My shaft does not turn when sailing. Perkins 4-108 with Paragon transmission and Walter V-drive. A feathering prop should do just that: when the boat is moving forward, the blades should feather, so that there's virtually no turning motion on the shaft. Bill

07-04-2008, 15:30	#11
tburgess Registered User Join Date: Apr 2008 Location: Antigua Boat: Atlantic 48 Posts: 12	Bill, Thanks for the info. I had a Perkins 80hp (can't remeber the model) with straight shaft and max prop in my old 50 foot sloop. I had no probs over more than 10,000 cruising miles. I shut the engine down in forward and all was fine. My current boat sails a bit faster and it seems to be causing issues with the prop spin. In fact, I think the props may be spinning while folded. I need to try and spy the props while underway but it is a bit trcky at 10+ kts. It's a work in progress. -T

07-04-2008, 21:58	#12
fastcat435 Commercial Vendor Join Date: Jul 2007 Location: Amstelveen Netherlands Boat: FastCat 455 Green Motion Posts: 1,211 Images: 4	Hallo Bill there are rpm counters for sale that will work if set to the top of your sail drive to see if they turn or not they feel the vibration around 80 usd from taiwan but especcillaly in your very fast cat there should be a notable difference in speed between turning or not

08-04-2008, 04:39	#13
tburgess Registered User Join Date: Apr 2008 Location: Antigua Boat: Atlantic 48 Posts: 12	Thanks but there is no doubt they are spinning I just can't determine if the props are folded or not. I'm off the boat for a couple months. Will know more when we move back aboard.

08-04-2008, 07:34	#14
Joli Registered User Join Date: Nov 2005 Location: Ohio Posts: 1,203 Images: 6	If they are spinning they are opening. Maxprop advise to shut down the engine while in forward to assure the props are feathered. If you shut it down in neutral the prop can index into the reverse postition and then it will freewheel. When we used the Martec folders we always alligned the shaft so the prop was horizontal and one blade would not flop open, we then locked the tranny in reverse. Nothing spun.