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Date Posted: - Friday - 08/21/09 - 4:20pm
Author: Alan
Author Host/IP: 194.sub-75-213-221.myvzw.com / 75.213.221.194
Subject: Mariner 40 propellar

I have a Mariner 40 hull # 95 - Had her for over two years now and while I was out in the yard I was told I was way under propped. Cant't seem to get more then 4 and a half to 5 knots out of her. Can anyone tell me the correct size of the Mariner 40 Propellar?

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[> Mariner 40 prop -- Mike Anthony, - Sunday - 08/23/09 - 6:31am (mobilehost12788.internet.mymmode.com/166.204.163.148)

We have a Westerbeke 64, the original suggestion was a 21", however, my mariner only has a 1.125" shaft so the final selection was 18x15. At full throttle we turn 2600, which is top rpm for this engine. It will push Tivoli to 7 knots at 2200 rpm. I generally run it around 1800 and this will give me 6 knots and gives me about 1 gallon per hour usage on our diesel. The calculation was made by Michagan prop. I installed a 3 bladed sailorman prop.

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[> [> Prop -- Brian, - Sunday - 08/30/09 - 12:42pm (cache-ntc-aa09.proxy.aol.com/207.200.116.13)

Alan,

I just replaced my prop, Shaft, cutass bearing and coupling on my Mariner 36. I have a Perkins 4-107 that runs very strong, the trans is a Borg Warner. I think the ratio is 2.53 to 1.
The hull displaces 22,000 lbs. I had a 18" X 12 pitch 2 blade, left hand prop. I was able to reach 3000 RPM's (the 2 blade was very skinney)
I replaced it with a 3 Blade 18" X 10 pitch, left hand prop and am very happy with it. I get around 2800-2900 RPM's. It is much smoother with no vibration. At 2000 RPM's I reach about 5 1/2 to 6 knots.
If you have a Borg Warner transmission the ratio is attached on a plate that is bolted on the top, port side of the trans. I cleaned mine up with a little pumice hand cleaner to read it.

Good Luck

Brian Sweeney 1973 M36 Hull #9

My email is Sweendo44@aol or if you are in the USA call me if you would like 661-713-4371

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[> [> [> M40 Prop -- Lawrence Killingsworth M40 Ta' Ata Ori, - Monday - 08/31/09 - 1:23pm (c-67-185-196-164.hsd1.wa.comcast.net/67.185.196.164)

We run a 3-bladed, 18 inch X 14 pitch left-handed prop on Ta' Ata Ori. The engine is the original Perkins 4-107, with a Borg-Warner transmission. We usually motor along at about 1800 to 2000 RPM. She'll make 6 knots at 2000 RPM in flat water.

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