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Old 06 June 2016, 04:39   #41
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I'm guessing the pitch bit is clear? The latest 28" pitch Mercruiser Bravo IIIs are a four and three blade set. Looks odd on the ground but not so obvious on the boat. Causes some amusement on the slip occasionally.


Dave & Jeff - thanks for the leads on the nets - I was looking for one to create a "chart table" so might go a couple extra - they would have been useful on the trip. That said, if you're dressed for a day cruising you probably have enough pockets but it's nice to be able to have something to hand
just out of interest willk does the 4/3 blade set up work a bit like a jet engine in so much as the 3 blade compresses the water from the 4 blade or vise versa might be a stupid question as i no nothing of inboard set ups.

cheers
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Old 06 June 2016, 04:39   #42
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Aha, thanks for that willk.
I thought I was going even more daft than normal.
I was SURE Bravo 3s were 3 and 3.
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Old 06 June 2016, 05:04   #43
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just out of interest willk does the 4/3 blade set up work a bit like a jet engine in so much as the 3 blade compresses the water from the 4 blade or vise versa might be a stupid question as i no nothing of inboard set ups.
I know almost nothing about props but no, that's not what they are doing (even if you substitute "directs" for "compresses"). The pair counter rotate and one is somewhat smaller than the other. This stops the boat heeling/tilting when underway and reduces propwalk at close quarters. The front four blader is the bigger and I suspect that it does the heavy lifting.

She came with a 24" Pitch 6 blade pair, based on her size. They were hopelessly under pitched and she came out of the hole like a rabbit but redlined at 37-38kts. We fitted 26" (as they had a pair) and those were similar but redlined at 39-40kts. We ordered the current set and she now has a very acceptable hole shot and can just about tip the redline when fully fuelled with a few PAX onboard. "Lightship" she still has to be watched at WOT as she'll stray into the red very easily at around 42kts.
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Old 06 June 2016, 05:43   #44
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Interesting - I run a 24" 6 blade set on my Bravo III (with a Yanmar 315), and was thinking a while back that could probably go up one pitch size at least - from memory it was redlining a bit early, and topped out at 38kn.


Will have to re-test once I finish putting in all back together!
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Old 06 June 2016, 10:20   #45
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I guess it's the zt drive not the bravo? I thought the lower unit & transom shield of the zt looked very similar to the bravo units. Are they the same units (bought from mercruiser or licenced from them) or just very close copies? A sensible move using the merc prop splines which makes propping easier
And you must have been happy that the boat performed better than initially expected 4 -5 knots over target gotta be happy with that
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Old 06 June 2016, 11:38   #46
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Glad you enjoyed! The good photos were taken by donegaldan with his special box of tricks
That lis a bng tidy bit of kit there son,u am a dark pony willk do u like song birds
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Old 06 June 2016, 12:14   #47
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I guess it's the zt drive not the bravo?
Yes. There appear to be many similarities, no idea of the provenance but the Yanmar has it's own internal water cooling system.
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Old 14 June 2016, 21:32   #48
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Epic voyage, Willkie! Amazing people lived for so long in such desolate islands.

Do you have any pics inside your bridge/boathouse and berthing?
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Old 15 June 2016, 01:30   #49
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At last ! I was beginning to wonder if she really existed.

Looks like a very special and impressive RIB
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Old 15 June 2016, 05:34   #50
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I heard of yet another leisure Redbay RIB, based in Norn Iron, visited the "Enchanted Isle" last week - "when you to have to go to sea"
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