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13-12-2024, 12:12
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#31
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Moderator
Join Date: Feb 2010
Location: Australia
Posts: 3,942
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Re: Kiwi prop causing stall into Reverse
Quote:
Originally Posted by pcmm
This is incorrect. The Kiwi prop uses a regular shaft key, nothing different from a regular shaft key.
Kiwi props have no adjustment in the reverse pitch. and the blades are free to pivot on their own. If the engine is stalling when you go into reverse but not forward I would look at fuel delivery. Can you get up to full RPM in forward?
1000rpm agreed is way too high of an idle 800rpm max
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Have you read the installation instructions? I had to find the source of a bad shaft vibration, it was the kiwi prop hub, distorted by a key that had been replaced with a regular square key, the result was that the hub never recovered from being pulled down against the taller key and had to be replaced
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13-12-2024, 12:14
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#32
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Registered User
Join Date: May 2014
Location: Whitby, Canada
Boat: Morgan Out Island 41
Posts: 2,405
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Re: Kiwi prop causing stall into Reverse
Quote:
Originally Posted by skipperpete
Have you read the installation instructions? I had to find the source of a bad shaft vibration, it was the kiwi prop hub, distorted by a key that had been replaced with a regular square key, the result was that the hub never recovered from being pulled down against the taller key and had to be replaced
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That must be a recent change. When I bought mine it did not come with a shaft key and the one I had from my standard prop fit perfectly with no adjustment
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13-12-2024, 12:15
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#33
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Registered User
Join Date: Sep 2008
Location: On the boat, somewhere in Australia.
Boat: Swanson 42 & Kelly Peterson 44
Posts: 9,408
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Re: Kiwi prop causing stall into Reverse
Quote:
Originally Posted by pcmm
Well said, though I have to ask about the "savage prop walk" what is this your talking about? My Kiwi prop virtually eliminated the very sever propwak that I had on my boat in reverse. With my fixed blade the boat would do a 90 degree turn within a boat length when in hard reverse. with the Kiwi prop I go almost straight backwards in hard reverse. Its brilliant! though sometimes I miss the prop walk!
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Weird. I have Kiwis on both of my boats and in both cases I get really strong prop walk, which, as you suggest, is a good thing.
The boats are pretty different underwater too, though both are older styles. One has a cutaway forefoot 3/4 keel with a keel hung rudder, prop aperture in the rudder, the other is cutaway forefoot keel, brewer bite, skeg hung rudder, again with the prop aperture in the rudder.
Maybe it has something to do with having the aperture in the rudder?
Certainly the latter boat, a Kelly Peterson 44, was close to unmanoeuvrable before I fitted the Kiwi.
__________________
Refitting… again.
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13-12-2024, 12:16
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#34
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Registered User
Join Date: May 2014
Location: Whitby, Canada
Boat: Morgan Out Island 41
Posts: 2,405
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Re: Kiwi prop causing stall into Reverse
Quote:
Originally Posted by GILow
Weird. I have Kiwis on both of my boats and in both cases I get really strong prop walk, which, as you suggest, is a good thing.
The boats are pretty different underwater too, though both are older styles. One has a cutaway forefoot 3/4 keel with a keel hung rudder, prop aperture in the rudder, the other is cutaway forefoot keel, brewer bite, skeg hung rudder, again with the prop aperture in the rudder.
Maybe it has something to do with having the aperture in the rudder?
Certainly the latter boat, a Kelly Peterson 44, was close to unmanoeuvrable before I fitted the Kiwi.
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Mine is a Morgan Out Island. the Kiwi prop almost completely eliminated my prop walk!
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13-12-2024, 12:23
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#35
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Moderator
Join Date: Feb 2010
Location: Australia
Posts: 3,942
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Re: Kiwi prop causing stall into Reverse
Quote:
Originally Posted by pcmm
That must be a recent change. When I bought mine it did not come with a shaft key and the one I had from my standard prop fit perfectly with no adjustment
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Nope, this was a pre covid propeller. Fitting a Kiwiprop requires a level of attention to detail above that with a normal propeller…. Nothing too complicated, just attention to detail, bearing blue and a keen eye for the hub to shaft fit before and after with the key.
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13-12-2024, 12:25
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#36
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Registered User
Join Date: May 2014
Location: Whitby, Canada
Boat: Morgan Out Island 41
Posts: 2,405
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Re: Kiwi prop causing stall into Reverse
Quote:
Originally Posted by skipperpete
Nope, this was a pre covid propeller. Fitting a Kiwiprop requires a level of attention to detail above that with a normal propeller…. Nothing too complicated, just attention to detail, bearing blue and a keen eye for the hub to shaft fit before and after with the key.
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agreed, that's what the marking blue was for! And a bit of lapping to make it fit snug.
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13-12-2024, 14:10
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#37
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Registered User
Join Date: Dec 2024
Location: Australia
Boat: Bavaria Cruiser 36
Posts: 10
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Re: Kiwi prop causing stall into Reverse
Quote:
Originally Posted by Traumerei
Just a thought. Before going through the process of removing the prop, would it be possible to have a diver observe the prop at a safe distance while shifting from neutral to forward, back to neutral and then reverse. I had a similar issue years ago with a prop that had been serviced with the wrong type of grease. The grease washed out after a brief period and the feathering prop bound while transitioning from forward to reverse.
Because the prop bound up before it completely reversed its blades, the prop was way over pitched and would stall the engine.
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Hi, I went and had a look myself and I think this is exactly what is happening. I have a diver going down to remove the prop, service and reinstall.
Appreciate the response!
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13-12-2024, 16:25
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#38
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Registered User
Join Date: Jul 2011
Posts: 5
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Re: Kiwi prop causing stall into Reverse
I have 2 twenty one year old 3 bladed Kiwi props. This problem is described well on the Kiwi prop website and it has happened to me many times. Lubrication fixes it every time and it doesn’t matter how free the blades rotate on inspection, they will still paddle wheel if lacking lubrication and stall an engine. Great props IMO.
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13-12-2024, 16:57
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#39
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Registered User
Join Date: Sep 2008
Location: On the boat, somewhere in Australia.
Boat: Swanson 42 & Kelly Peterson 44
Posts: 9,408
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Re: Kiwi prop causing stall into Reverse
Quote:
Originally Posted by Hallwoves
Hi, I went and had a look myself and I think this is exactly what is happening. I have a diver going down to remove the prop, service and reinstall.
Appreciate the response!
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Said as kindly as possible, don’t trust the diver unless they’ve done this before.
Honestly, plenty of stories of lost Kiwi props and nearly every time it has been a diver who didn’t read the instructions. The method for locking the retaining nut has changed over the years, variations on a grub screw theme. You need to know which system your model uses and you need to know your diver ACTUALLY understands what is involved.
Get them to take photos of how they locked the retaining nut/boss.
I have little faith in some of the cowboys who do this stuff.
__________________
Refitting… again.
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14-12-2024, 11:51
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#40
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Registered User
Join Date: Dec 2014
Location: Porirua, New Zealand
Boat: Looking for next boat
Posts: 10
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Re: Kiwi prop causing stall into Reverse
I had a similar problem on my Bavaria 46 with a Volvo D2 55. I thought it was a Kiwiprop issue, but ended up being the gear shift cable. Apparently it stretches over the years, so the gearbox doesnt go into reverse fully. Simple test to confirm. Disconnect the cable from the gearbox. With the engine running put it in gear at the gearbox. I didnt beleave my mechanic until I tried this. New cable problem solved.
Also 1000RPM at idle is too fast should be about 700RPM.
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