Gori propeller

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marcot

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I have a three bladed folding Gori (shaft) propeller: a few days ago when motoring, it didn 't open to its full extend as previously. There was less power at the same rpm.
When inspected underwater less strength was needed to close the blades and to open them again.

Now I must go in reverse and then in forward to open it completely. ( never before).
What can I do (apart calling the local Gori supplier?)
 
marcot said:
I have a three bladed folding Gori (shaft) propeller: a few days ago when motoring, it didn 't open to its full extend as previously. There was less power at the same rpm.
When inspected underwater less strength was needed to close the blades and to open them again.

Now I must go in reverse and then in forward to open it completely. ( never before).
What can I do (apart calling the local Gori supplier?)
Click to expand...

I've got a two-blade one, which I recently serviced. Problem with the design (assuming the three-bladed one is similar) is that barnacles and other kinds of shell can grow in the recess where the toothed ends of the blades mesh together. Removing the blades, cleaning the recess and cleaning the blades in acid made mine operate nice and freely.

Apparently it is necessary to ensure that the steel pins on which the blades hinge are reassembled in the same hole and the same way round as they came out. I used waterproof grease when reassembling it.
 
AntarcticPilot said:
I've got a two-blade one, which I recently serviced. Problem with the design (assuming the three-bladed one is similar) is that barnacles and other kinds of shell can grow in the recess where the toothed ends of the blades mesh together. Removing the blades, cleaning the recess and cleaning the blades in acid made mine operate nice and freely.

Apparently it is necessary to ensure that the steel pins on which the blades hinge are reassembled in the same hole and the same way round as they came out. I used waterproof grease when reassembling it.
Click to expand...

+1 I have the three bladed model and the gears need to be cleaned which is not a problem in the Med. Do take care when diving and moving the blades as it is so easy to reverse them and trap one's finger as they pass each other. I say this, not through experience but each time I dive to clean the prop I have nightmarish thoughts of getting a digit trapped.
 
marcot said:
Now I must go in reverse and then in forward to open it completely. ( never before).
What can I do (apart calling the local Gori supplier?)
Click to expand...


We have always gone in reverse then forward to get over drive.

We do it because 'we' have to stop the boat and get about 1knot astern the prop does its thing and we head off in over drive. This is a sure way of getting overdrive.

"The function is simple. E.g. when changing from "overdrive" to normal ahead the shift and throttle control is set in neutral, which allows the propeller to fold. Then the shift and throttle control is set in forward again."
 
The problem of barnacles should not be a problem if you scrub regularly and clean the Gori gears. To keep barnacles at bay keep the gears well covered in waterproof grease. That has been my way of avoiding any problems.
 
Electrolysis will happen on the geared teeth far quicker than elsewhere. You can try moving the blades manually but it's often the case that when you do, it won't seem that there's a problem. It's only when you push the blades in different directions while trying to open them that it becomes apparent you have to work the blades. You do have to make sure the blades and pins are in the right holes and slots too.
 
Concerto said:
The problem of barnacles should not be a problem if you scrub regularly and clean the Gori gears. To keep barnacles at bay keep the gears well covered in waterproof grease. That has been my way of avoiding any problems.
Click to expand...

Problem with mine was barnacles etc. growing in the recess behind the gearing, in a location not accessible without dismantling the blades, which can only be done with the boat out of the water.
 
savageseadog said:
Flex o fold do not recommend greasing as dirt and grit sticks to it. I don't know what other manufacturers say
Click to expand...

As I've had occasional trouble with the blades not unfolding in reverse - which is a bit disconcerting when coming into a berth - I too would prefer to keep the friction as low as possible.

The fix, by the way, is to give a quick burst in forward to open the blades! But it takes a bit of nerve when going into a dead-end.
 
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