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Old 11 May 2013, 18:13   #1
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Country: UK - Wales
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Single or twin engine

At present I have a Humber Assault RIB with a single Suzuki DF70 which is good for 30kts and and a bit more on a calm day.
Am looking at a Humber Destroyer which has twin Mariner 60hp engines, in the advert it says max speed about 26kts, seems a bit low to me or would this be correct?

Cheers, Taff.
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Old 11 May 2013, 18:29   #2
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You'll have to indicate size and layout of the two RIBs...
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Old 11 May 2013, 19:18   #3
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Mine is 5m long with two person jockey seat, other is 6.5m long with two twin jockey seats.
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Old 11 May 2013, 21:01   #4
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Before this explodes into a big irrelevant discussion, hae a search for my previous posts on this subject.....

Overall weight will be a factor, but at this end of the scale gearbox size & overall weight will be significant. Also are the quoted figures for your new boat fully loaded with dive kit??? Just a guess, but there are a lot of factors to consider here...
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Old 12 May 2013, 05:25   #5
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Quote:
Originally Posted by taff View Post
Mine is 5m long with two person jockey seat, other is 6.5m long with two twin jockey seats.
See, that's apples and oranges - completely different rigs. A friend has a 6.5m with twin Mariner 60s. He struggles to make 28kts at WOT.
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Old 12 May 2013, 08:06   #6
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Quote:
Originally Posted by willk View Post
See, that's apples and oranges - completely different rigs. A friend has a 6.5m with twin Mariner 60s. He struggles to make 28kts at WOT.
Bet it's a larf going cruising with him.
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Old 12 May 2013, 08:26   #7
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Bet it's a larf going cruising with him.
It's fine if I use the SIB
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Old 21 May 2013, 09:14   #8
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Country: France
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Go to catamaran ...!

I own a 6.3 south african one, made by Stingray, not a light unit due to a lot of GRP + big 2-men console with 2 front seats, + 2 men-bolster for driver and ... + bow sundeck, but with a pair of 60/70 Tohatsu (2 stroke with 3 carbs) she reaches 44 knots with the right SS props.

Goes to 30 with 12 on board, not bad !
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