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  #1   IP: 104.63.102.166
Old 09-19-2016, 12:49 PM
Moltensurf Moltensurf is offline
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islander 36 2:1 gear reduction;prop size

hi everyone, my name is jonathan, I am the owner of a 1977 i36. I have a small problem, I let my zinc on the prop shaft go bad; now I am needing to buy a new prop. there is not a lot of info online about the subject. I have an atomic 4 gas engine with a 2:1 reduction gear.
I talked to the guys at indigo and they suggest a 12" prop with 12 degree pitch. that is on a three blade prop. I found a 2 blade prop online 12/10 but I was told this is not a good match for my boat, and and that I need something more like a 15", but i'm not sure there is enough clearance between my hull and the prop. is there anyone out there with some info that could be of help?
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  #2   IP: 24.152.132.65
Old 09-19-2016, 09:00 PM
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ndutton ndutton is offline
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If my memory hasn't failed me, the standard I-36 prop was a 16x10x[shaft dia] RH 2 blade. Standard boat was powered with the Atomic 4 with 2:1 reduction gear.

Last edited by ndutton; 09-19-2016 at 09:13 PM.
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Moltensurf (09-19-2016)
  #3   IP: 76.7.97.57
Old 09-20-2016, 08:27 AM
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Marian Claire Marian Claire is offline
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Having gone thru the re-propping process on a non standard boat here are some links you may find of use.
http://www.moyermarine.com/forums/showthread.php?t=6148

http://www.moyermarine.com/forums/fo...c&daysprune=-1

http://www.moyermarine.com/forums/showthread.php?t=6046
Be aware of the disclaimer in my first post on this thread about faulty tach numbers.

Short version is that a 14 X 9 three blade proved to be a good match for my boat. 12000 # displacement, 25' water line, 2 to 1 reduction gear with proper clearances in the aperture.
Welcome to the forum.
Dan S/V Marian Claire

Edit: You may also need to address the issue that caused the zinc and prop to be degraded.

Last edited by Marian Claire; 09-20-2016 at 08:34 AM.
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Moltensurf (09-20-2016)
  #4   IP: 205.197.242.177
Old 09-20-2016, 04:35 PM
Moltensurf Moltensurf is offline
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I have two quotes From different prop companies. One suggests 14/10 another 13/10. I have 8.375" clearance to bottom of hull from center of prop shaft.
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  #5   IP: 32.211.28.40
Old 09-21-2016, 09:51 AM
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Al Schober Al Schober is offline
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My Tartan 30 has a 12" prop, and it only clears the hull by about 1/2". This hasn't been a problem. I wouldn't let tip clearance drive your choice of propeller.
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Moltensurf (09-29-2016)
  #6   IP: 205.197.242.174
Old 09-29-2016, 11:43 PM
Moltensurf Moltensurf is offline
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I found a 13/10 prop at a good price. I have room for the 14/10
Will one inch of prop make a huge difference?
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  #7   IP: 205.197.242.174
Old 09-30-2016, 08:38 AM
Moltensurf Moltensurf is offline
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Well I guess I answered my own question
Changing prop size one inch or pitch by one degree changes rpm by 200
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  #8   IP: 216.4.56.181
Old 10-04-2016, 04:23 PM
Moltensurf Moltensurf is offline
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Finally found an affordable used prop. 14x10 got it a Minnie's for 145.00
Thanks for the help.
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