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Old 11 April 2006, 08:45   #1
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Country: Other
Town: VALENCIA
Boat name: Madueño
Make: Zodiac
Length: 7m +
Engine: Suzuki df250
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Posts: 75
Suzuki DF250 & Medline III correct pitch

My Zodiac Medline III cames with a prop (ss 3 X 16) with 18,5 pitch, and reach very easy 46 mph (GPS) at 6.100 rpm almost in any condition. Suzuki official test (2004 GLOBAL PRESS LAUNCH TEST NO: 2003-012 )of the Suzuki DF225 on the same boat use a prop with 21,5 pitch and reach 47,7 mph at 5.750 rpm, with same weight and 2 persons the same I use to.
If I change the prop to that pitch 21,5 the boat should run faster at more slow rpm?. Thanks for any help
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Old 11 April 2006, 09:06   #2
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Yes if you increase the pitch the revs will come down and your speed will go up a little - a lot of prop choice is trial and error. Make sure you get a stainless prop.

You could try this prop calc program - use your exsisting data first then play around with different figures etc.

http://www.rbbi.com/folders/prop/propcalc.htm
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Old 12 April 2006, 12:15   #3
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very useful information

Thanks a lot for the web page, it,s perfect for calculate the correct pitch.
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Old 12 April 2006, 12:22   #4
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When you try the new prop let us know how you get on.
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Old 02 April 2007, 07:01   #5
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Suzuki df250 test with new prop on MedlineIII

After one year of conversations, finally Zodiac Spain (a lot of thanks to Pere Garcia Director General de Zodiac Española) send me a new stainless steel prop with a pitch of 21,5, the boat (Zodiac Medline III) cames first with a pitch of 18,5.

The boat goes much better, not only is faster al lower rpm 51 mph at 6.000 (before 47 mph at 6.100), at medium range 2.500 3.000 run very smooth with a low consum.

Thanks for the help.

n.b. Now I have two props, the older can be use if the other brokes.
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Old 02 April 2007, 09:34   #6
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Thanks for the update - how much fuel do you use?
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Old 03 April 2007, 11:35   #7
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Consum

It is very difficult for me to know how much fuel i spend. In my trip to Ibiza I think in the first part of about 67 nm about 115 liter so 1,71 l per nmile. With the new prop it seems to be better, but i dont know it with precision.

I have put some videos in YouTube from rough weather to ribing with my zodiac, If you like the sea i think you would like them.
thanks for all.




etc look for user medlineIII
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Old 03 April 2007, 13:51   #8
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That is crazy - I posted the first clip myself a few months ago - haven't seen the others though - love stuff like this. Even more of a coincidence the composer of the music in videos 1 and 2 is from my home city - Swansea!!!

Don't know if you have seen this before but it's a great one of a RIB in action.

http://www.boomeranger.fi/images/ind...conditions.mpg
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Old 03 April 2007, 14:21   #9
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hi medline sorry for the change of topic but i'm wondering about boating around valencia. where do launch from or do you keep your boat afloat, are there many public slips, whats the cruising like, can you recommend a marina and what are the charges like. sorry for all the questions and thanks in advance. gerry
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