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Old 24 April 2007, 08:59   #1
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Country: France
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Humber 600 df 140 prop size

Hello,

I tried my new rib last monday, and the propeller is too short.

The prop is a 14X19.

Max speed 36knt with 6300 rpm.

If someone with the same boat can help a poor french ribman...

I think a 14X21, or perhaps a 14X23 could be a better choice.

Thanks

Antoine
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Old 24 April 2007, 09:11   #2
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6250 is the max revs for that engine so it sounds like its reving about right at wot....
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Old 24 April 2007, 09:14   #3
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The problem is that i can push more the engine...
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Old 24 April 2007, 18:08   #4
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Originally Posted by antoine View Post
I tried my new rib last monday, and the propeller is too short.
It isn't supposed to reach the bottom though

Sorry I could not resist that obvious and extremely poor joke
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Old 24 April 2007, 18:46   #5
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I run with a 14x21 ally on my 6.2 which carries some weight, 37knts at 6,000 revs WOT. you dont sound to far off the mark considering that mine is a sports hull,
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Old 24 April 2007, 21:20   #6
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Bonjour,

I changed from a 14x19 on my suzuki df 90 to a 14x21 and it reduced the revs by about 600. Combien coute le propulseur 14x21 en France (et le 14x22 inox)?

Keith
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Old 24 April 2007, 21:53   #7
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prop

hi i have same new humber with a yamaha 115 four first trip last week and am getting identical performance
let me know how you get on if you do change prop
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Old 27 April 2007, 20:33   #8
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if your boat is not able to exceed 36 knots sell it my friend or buy an Italian boat

sorry

A+ Adonf
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Old 28 April 2007, 08:48   #9
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My dear Adonf,

I hoppe that you will never say one more time that you don't speak english...

For our trip, you will speak and i will drink.

Antoine
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Old 28 April 2007, 09:36   #10
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I used my friend google ;

For our trip, you will speak, it's better your boat is too slow but it is beautiful

A+ Adonf
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Old 30 April 2007, 08:25   #11
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Country: France
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I tried yesterday a 14X21 prop.

It was better, but...

With five persons on board, 37,7 knt, but still 6200 (at least) rpm.

It's too much, and i will try a 14X23 next week.

Antoine
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Old 30 April 2007, 08:37   #12
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Quote:
Originally Posted by antoine View Post
Hello,

I tried my new rib last monday, and the propeller is too short.

The prop is a 14X19.

Max speed 36knt with 6300 rpm.

If someone with the same boat can help a poor french ribman...

I think a 14X21, or perhaps a 14X23 could be a better choice.

Thanks

Antoine
in theory to pass from 19 " to 23 ", the motor would have to come down of 800 turns the average e' 200 turns to inch
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Old 21 May 2007, 13:03   #13
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Country: France
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Make: HUMBER 600 DESTROYER
Length: 6m +
Engine: DF 140 SUZUKI
Join Date: Nov 2006
Posts: 83
Hello,

I tried a 14X23 prop last WE and it seems to be better:

42 knts and 6100-6200 rpm.

Two persons on board, about 85 L...

Antoine
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Old 21 May 2007, 13:15   #14
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A + Adonf,

I have doen some research on my Suzuki DF 140.

Below is the link.

http://rib.net/forum/showthread.php?...uzuki+140+prop

Basically I ended up with a custom 22" prop. Far better than the Suzuki job. Just waiting for a new one as I've bent my old one but thats another story.

Regards Nick.
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