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Old 02 June 2006, 03:11   #21
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Country: UK - England
Town: West Sussex
Boat name: Grey Mist
Make: Parker 800 Baltic
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Engine: 2xMercury Diesel 170
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Parker 630 - Diesel, Mercruiser 1.7 (120HP) WOT 4400 RPM, 1 person - me , half a tank of fuel say 60 ltrs, calm water > 36knots
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Old 02 June 2006, 04:07   #22
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Make: Ribcraft
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Ribcraft 4.8 Suzuki 70 f/s

Flat out one person on Board 50 ltrs Fuel 36 knots, two persons, 33 knots, four on board, 31 knots, will burn 45 litrs heavy use in 7 hours, Great boat !!
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Old 02 June 2006, 04:13   #23
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BWM Deepsea 17 with 90 merc Four stroke. One up and 60 litres with a heavy load. 19" prop Max was 41 knotts but hole shot was crap. With a 17" prop Max of 38.5 knotts but would have to say that with reliability that 36/37 knotts was easily achivable.

Bruce wouldn't cruising speed at 4000 RPM be more constructive?
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Looks Slow but is Fast
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Old 02 June 2006, 07:21   #24
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Country: France
Town: Plougastel-Daoulas
Boat name: Kristha
Make: Narwhal HD580
Length: 5m +
Engine: Tohatsu 90hp TLDI
Join Date: Feb 2006
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Narwhal HD 580 and Tohatsu 90 TLDI, 13x19 Yam prop,

39kts averaged (38.5 and 39.5 back), driver only, 40 liters fuel, pretty calm sea.

Usually 37kts@5600 RPM with 2 or 3 on board and chop.
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Old 02 June 2006, 08:57   #25
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Engine: 150xr2
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Ringrib, purchased one of the first ledgand ribs end of 97, on invoice and, on display sticker it said 6m however when measured it turned out to be 5.85, where is my .15 I would like to know? anyway already owned a freshly rebuilt xr2 that had achieved over 80mph on a 27ft boat, so I thought what the hell, I will use that and as this boat is only around 6m I will be happy if it only does a 100mph. A mate after driving mine purchased an identical rib and fitted a yam 130hp with 2 up and half fuel he has reached 59.3mph on GPS but it hits the limiter, but he has got many stainlss props to play with, he recons this year he will get over 60+, one thing at part throtle it still goes well with amazing economy for speed, where as the xr2 drinks like a fish!!!
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Old 02 June 2006, 09:31   #26
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Not a Rib, but same similar size and a popular hull.

Ring 15ft Speed Boat
70HP Tohatsu 5500rpm
38-40 knots more to come though
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Old 02 June 2006, 09:31   #27
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Country: UK - England
Town: Aylesbury/Lymington
Boat name: Farfetched
Make: Solent
Length: 6m +
Engine: 150hp Optimax
MMSI: 235021048
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Thank you so far

More please, these results serve to confuse as well as enlighten. The more data the better.

Thank you so much

Bruce
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Old 02 June 2006, 09:45   #28
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Country: UK - England
Make: extreme 24
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Engine: merc 6.2 320hp
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like the above,not a rib,but a well used hull(extreme). will keep you informed
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Old 02 June 2006, 10:46   #29
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Country: UK - England
Town: St Albans
Boat name: Skylark
Make: Ribcraft 585
Length: 5m +
Engine: 140 Suzuki
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Ribcraft 5.3 mariner 90HP S/S 18 prop 4 st 2 up + half tank WOT = 39kts
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Old 02 June 2006, 11:33   #30
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Country: UK - England
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Make: Osprey ViperMax
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Engine: 200HP Etec
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New Ribcraft 6.5 with 175hp Suzuki, 23pitch SS prop, 140litres of full and three people on board 45knts WOT.
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