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Old 08 July 2016, 17:00   #11
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Originally Posted by Bam_bam View Post
Unfortunately my Suzuki is a 2004 so no lean burn on that I presume?


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Probably not, also if it's that vintage, all the other figures might be a load of billhooks too


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Old 08 July 2016, 17:09   #12
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When I bought the boat it had one fitted some people call them "anti-cavitation" plates
Those are neither anti-ventilation plates nor anti-cavitation plates - those are doel fins and unless there is something very odd about your 6.5m Stormforce, you shouldn't need them. They may be your problem. Wig 'em off.
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Old 08 July 2016, 17:15   #13
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Those are neither anti-ventilation plates or anti-cavitation plates - those are doel fins and unless there is something very odd about your 6.5m Stormforce, you shouldn't need them. They may be your problem. Wig 'em off.


Right I didn't know that, I will most definitely take them off see how she goes, they must cause a considerable amount of drag...

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Old 08 July 2016, 17:23   #14
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they must cause a considerable amount of drag...
Mostly they cause Lift (at the stern). Maybe fitted for slow planing work - towing toys perhaps?

My suspicion is that they have been keeping you "bow-down" when at speed. When you remove them, go out some nice flat day and open her up. Then trim the engine out until it ventilates (blows out/overrevs) then trim back in until it bites. That is your best speed with that prop.

My previous RIB was a year 2000 6.5m Stormforce - nice boat.
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Old 08 July 2016, 17:32   #15
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Mostly they cause Lift (at the stern). Maybe fitted for slow planing work - towing toys perhaps?

My suspicion is that they have been keeping you "bow-down" when at speed. When you remove them, go out some nice flat day and open her up. Then trim the engine out until it ventilates (blows out/overrevs) then trim back in until it bites. That is your best speed with that prop.

My previous RIB was a year 2000 6.5m Stormforce - nice boat.

Yes my bow is down, well at least compared to my last rib, a 7 meter ribtec that had an inboard diesel, wow that thing was heavy at the back.. Yes I'm growing very fond of my Stormforce, softer ride than the bigger ribtec too which was a surprise.

Fingers crossed this "nice flat day" isn't too far away!!

I will let you know how I get on.


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Old 15 July 2016, 05:37   #16
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Quote:
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When I bought the boat it had one fitted some people call them "anti-cavitation" plates, I'm just curious to know would the prop vent without it. See my pic below, looks pretty easy to take off...




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Hi.

Yep, as others have said, those Doel fins are a big help if your power is "border-line" but I'd guess you're about 170hp over "border-line."

.....in the bin

Just re-checked mine and I'm actually only about 27mph at 3700 (44mph WOT) at 5400.
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Old 15 July 2016, 05:55   #17
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Unfortunately my Suzuki is a 2004 so no lean burn on that I presume?


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first lean burn 90 hp in 2008
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Old 15 July 2016, 06:39   #18
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Current 250hp Suzuki has a full throttle operating range of 5300-6300, so at 6200 you have pretty much the best propeller for ALL ROPUND PERFORMANCE. You should be getting a good top speed and good accelleration.

I'd be looking to borrow a 23" and see what happens.

If you can't find one to borrow get a search up on ebay - you never know what comes up.

I'd also not be shy of trying an aluminium prop if your preferred size in stainless doesn't come up.

Lose the fins unless you need to be able to plane at low speeds.
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