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Old 07 December 2004, 04:05   #1
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New 10M RIB

My company, K4+ Ltd, has just designed this new double stepped hulled RIB for a new Greek company.

Just got back from testing the development boat myself - and very pleased with performance. Running twin 250hp outboards (but mounted low) she ran 62knots with 4 crew and ballast and would have gone quicker if we had propellers with more pitch. What really pleased me was running on one engine (with the other trimmed out of the water) she still ran 49.5 knots!

The boat, Technohull 999, is now being prepared for production and interior moulds are being worked on for a March launch.
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Old 07 December 2004, 04:28   #2
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Nice looking boat Adam,

Are you testing her out of Lymington? Does she use the same clever tapered steps as the K4+ 6.5m? She certainly looks like she flys!

Tim
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Old 07 December 2004, 05:11   #3
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No - testing was just outside Athens! A great trip and one of the 'perks of the trade'.

Steps are similar to the KR6.5 in concept. Again trying to produce a boat that is more efficient but at teh same time handles well and has good low speed characteristics.
Adam
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Old 07 December 2004, 08:01   #4
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Interesting figures 62knots with two 250hp outboards & 49.5knots with only one running and the other out of the water, Hmmm what do you think the top speed would have been if you took one engine off completely making the whole thing about 200-250kg lighter?
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Old 07 December 2004, 08:27   #5
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Quote:
Originally Posted by Adam Younger
My company, K4+ Ltd, has just designed this new double stepped hulled RIB for a new Greek company. .
I thought Manos only bought his boats in South Africa!
Nick
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Old 07 December 2004, 08:42   #6
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Quote:
Originally Posted by Jackwabbit
Interesting figures 62knots with two 250hp outboards & 49.5knots with only one running and the other out of the water, Hmmm what do you think the top speed would have been if you took one engine off completely making the whole thing about 200-250kg lighter?
Good point - not only that but with the thrust more central and the leg set up properly naybe even closer???

This is one of the reasons why I have gone for just 1 engine on my boat - 2x engines = 2x fuel costs and thats about all.
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Old 07 December 2004, 09:03   #7
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Quote:
Originally Posted by Jackwabbit
Interesting figures 62knots with two 250hp outboards & 49.5knots with only one running and the other out of the water, Hmmm what do you think the top speed would have been if you took one engine off completely making the whole thing about 200-250kg lighter?

One of the areas I'm working on at the moment is different engine packages including inboard options and looking into speeds / weights etc. Certainly the 49.5 knots was better than I expected at this stage on one engine, it also handled really well and felt quite responsive.

Quite correct that there will be improvements with the weight saving and with the single engine actually on the centreline. Also we were way out on props as it was still proped for the twin set-up and as such would only rev to just over 5000rpm. I think that the single engine set-up could also benefit from maybe a touch of set-back and a 4 blade prop for initial acceleration as she is a big boat. Anyway it could be a good option for the boat with a small auxillary engine (essential in Greece) and to this end I believe the builders are looking at offering teh boat with a single Verado Mercury and have had an enquiry already about fitting a single 300X Promax Mercury.
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Old 07 December 2004, 11:37   #8
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Congrats Adam Nice looking boat.

Let me have a guess about the area just outside of Athens. May be Eleysina on the way to Korinthos? It looks like it from the photo and may be the company owner is called POLATOS by any chance who makes boats such as the APACHE?

Great looking boat hope it sells in Greece. The competition on this size of boats with stepped hulls as you probaly know is quite hard out there with GREAT WHITE, Xtream Boats HUMMERHULL, the newish VICTOR and the long established but lucking in finish quality MOSTRO.
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Old 07 December 2004, 19:05   #9
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Great looking boat Adam. Look forward to read more about her in the future.

Bogi
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Old 07 December 2004, 21:00   #10
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Quote:
Originally Posted by Adam Younger
One of the areas I'm working on at the moment is different engine packages including inboard options and looking into speeds / weights etc. Certainly the 49.5 knots was better than I expected at this stage on one engine, it also handled really well and felt quite responsive.

Quite correct that there will be improvements with the weight saving and with the single engine actually on the centreline. Also we were way out on props as it was still proped for the twin set-up and as such would only rev to just over 5000rpm. I think that the single engine set-up could also benefit from maybe a touch of set-back and a 4 blade prop for initial acceleration as she is a big boat. Anyway it could be a good option for the boat with a small auxillary engine (essential in Greece) and to this end I believe the builders are looking at offering teh boat with a single Verado Mercury and have had an enquiry already about fitting a single 300X Promax Mercury.
Be interesting to see some more performance data when you have it - what's she like in turns? I have read that stepped hulls need to be treated with a bit of respect - is that the case?
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