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 Catalina/Capri 25/250 Sailor's Forums
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Derek Crawford
Master Marine Consultant

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USA
3324 Posts
Initially Posted - 11/04/2002 :  21:42:03  Show Profile
Anyone out there have a 6.5" pitch prop on their O/B? I need to get a new one for my Nissan 8hp XLS and need the max thrust at low RPM's for manoevering into the slip. My choices are 6.5/7.5/8.5. I almost never run flat out. I would appreciate advice from the experts<img src=icon_smile_approve.gif border=0 align=middle><img src=icon_smile_big.gif border=0 align=middle>
Derek
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 11/04/2002 :  22:39:33  Show Profile
Derek: My Honda 8 has a 10x6.5 with 4 blades. The lower pitch means somewhat higher RPMs, but much better "bite" at low speeds. I don't know what the best prop is for an 8hp 2-stroke, but I wouldn't be surprised if the lowest pitch was best. Honda and Yamaha both go to a larger diameter for their high-thrust setups, but that's limited by your anticavitation plate.

Dave Bristle - 1985 C-25 #5032 SR-FK-Dinette-Honda "Passage" in SW CT
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Derek Crawford
Master Marine Consultant

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USA
3324 Posts
Response Posted - 11/05/2002 :  00:29:43  Show Profile
Thanks Dave - the max diameter prop I could use is an 8.5. (Do Honda only use 4-blade props on their 4-strokes?) Nissan says that the risk of a 6.5 pitch is that it can allow the rpms to exceed the max at the top end (which is 4,500 - 5,500) How do you know when you're redlining (before the engine blows up!!)? (Sorry for all the questions - but this is the first prop I've had to replace - and the local dealer is not much help!)
Derek (the engine dummy!<img src=icon_smile_blush.gif border=0 align=middle>)
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 11/05/2002 :  11:04:12  Show Profile
Derek: I think Honda only uses 4 blades on their "Power Thrust" models; Yamaha increases the width of the three blades. On both, the larger diameter adds thrust and probably helps to alleviate the over-revving problem. I see the new Nissan 8hp 2-stroke offers the 6.5 as an option, so apparently the factory thinks it's OK. If your gear ratio is the same, you should be fine. It would probably be more of an issue with a planing hull--your 6 knot displacement hull will keep the prop from slipping through the water as easily as it would on a planing inflatable. Having said all that, if you fry your motor, somebody else posted this using my name! <img src=icon_smile_blackeye.gif border=0 align=middle>

BTW, how do you know when you're redlining? By mounting a chrome tach on top of the companionway hatch, of course!

Dave Bristle - 1985 C-25 #5032 SR-FK-Dinette-Honda "Passage" in SW CT

Edited by - dave bristle on 11/05/2002 11:06:15
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Derek Crawford
Master Marine Consultant

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USA
3324 Posts
Response Posted - 11/05/2002 :  16:04:46  Show Profile
"how do you know when you're redlining? By mounting a chrome tach on top of the companionway hatch, of course!"

Thanks for the thought Dave - but I'm a sailor not a NASCAR driver!!
<img src=icon_smile_big.gif border=0 align=middle>
Derek
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ssteakley
Captain

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USA
467 Posts
Response Posted - 11/05/2002 :  23:51:34  Show Profile
Derek,
I would choose the 8.5 but of course I am not from around here, I did stay at a "Holiday Inn Express" once though!<img src=icon_smile_wink.gif border=0 align=middle><img src=icon_smile_question.gif border=0 align=middle>
Steve
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 11/06/2002 :  09:51:35  Show Profile
You didn't stay long enough, Steve... <img src=icon_smile_sleepy.gif border=0 align=middle>


Edited by - dave bristle on 11/06/2002 10:02:50
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.