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Folding prop problem

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Created by Kryspen > 9 months ago, 4 Feb 2023
Kryspen
QLD, 95 posts
4 Feb 2023 7:28PM
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I pulled our my folding prop as i have noticeable out of balance spin. The bronze tooths are worn out and not mashing together.
The prop had small red spots and apparently is not possible to weld build teeth.
Is really that so ?
Do anything have ideas on how to fix the teeth on folding prop ?
Unfortunately they don't make this prop anymore and is not possible to get new blades ( 120 S sail drive ).

Jolene
WA, 1620 posts
4 Feb 2023 6:34PM
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I would definitely try to rebuild the teeth with a tig then re cut the gear tooth profile.
First I would also be looking at the wear in the blade hinge, and the possibility of re bushing along with new pins .

UncleBob
NSW, 1299 posts
5 Feb 2023 9:49AM
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Select to expand quote
Kryspen said..
I pulled our my folding prop as i have noticeable out of balance spin. The bronze tooths are worn out and not mashing together.
The prop had small red spots and apparently is not possible to weld build teeth.
Is really that so ?
Do anything have ideas on how to fix the teeth on folding prop ?
Unfortunately they don't make this prop anymore and is not possible to get new blades ( 120 S sail drive ).


The red spots and degeneration of the prop in general would indicate a visit to someone that repairs and/or builds props for a living.

lydia
1927 posts
5 Feb 2023 7:12AM
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Select to expand quote
Kryspen said..
I pulled our my folding prop as i have noticeable out of balance spin. The bronze tooths are worn out and not mashing together.
The prop had small red spots and apparently is not possible to weld build teeth.
Is really that so ?
Do anything have ideas on how to fix the teeth on folding prop ?
Unfortunately they don't make this prop anymore and is not possible to get new blades ( 120 S sail drive ).


120 S is a very common leg.
Any propulsion engineering shop should be able to get you a new prop if not the part.
Folding props have a very limited life.

Kryspen
QLD, 95 posts
6 Feb 2023 7:24AM
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Looks like i might get 2 blade fix prop. Looks cheaper than folding prop.

Ramona
NSW, 7731 posts
6 Feb 2023 8:43AM
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Not all folding props have the gear teeth. The gears just mean the blades open the same. The Gori two blader has blades that open independently. I would suggest trying to balance the blades and see if that fixes the out of balance. It sounds to me like one blade is opening further than the other one. This is more easily fixed than trying to get the gears to mesh. The red spots sound like electrolysis from not keeping up with anode changes with a sail drive. gadsolutions.biz/marine-corrosion/propeller-corrosion
This can be serious and the blades can be severely weakened. A few red spots are OK but if it all goes pink the blades can fall off.

Jolene
WA, 1620 posts
6 Feb 2023 9:02AM
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Most of the folding props I have repaired, the hinge bearings are flogged out which alters the blades working position and causes excessive clearance in the gear mesh .



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"Folding prop problem" started by Kryspen