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Old 20 September 2009, 17:41   #11
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Country: UK - England
Town: NW& wherever the boat is!
Boat name: depends on m'mood!
Make: Humbers/15-24m cats
Length: 6m +
Engine: etec130/big volvos
MMSI: many and various
Join Date: Nov 2001
Posts: 1,815
put a new suzuki 21 inch ali prop on today to replace the 19 inch as originally supplied with the suzuki DF90/6m destroyer.
Yesterday with the 19 inch, 5 people and 80 litres or so of fuel got around 5700 + rpm at 29 knots straight into an ebbing tide which was doing 2/3 knots.
The 21 incher peaked out into the same tide and load conditions at around 5400 with a gps reading of just over 30 knots.
So with the tide taken into account the actual speed thru the water was 2/3 knots over the gps readings. No probs at all at the bottom end and we all felt that the mid range acceleration was better. Need to try it with just the two of us onboard sometime when I am home again but as yet seems like job done!
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Old 07 March 2010, 16:06   #12
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Country: UK - England
Town: NW& wherever the boat is!
Boat name: depends on m'mood!
Make: Humbers/15-24m cats
Length: 6m +
Engine: etec130/big volvos
MMSI: many and various
Join Date: Nov 2001
Posts: 1,815
eventually home for a day or two.
21 inch suzuki ali prop 4 persons and 80 odd litres of fuel onboard
WOT 5600rpm 33+knots max 35knots with a bit of tide behind us
4500 rpm cruise 25 knots
so it has solved the over rev problem with the 19 inch ali supplied originally which used to exceed 6000rpm
The trim angle on this boat does need to be right for max speed. Cant undertand why yours is so slow Bruce. There is a lot of kit on this boat as well as fuel and 4 people
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Old 07 March 2010, 16:47   #13
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Country: UK - Scotland
Town: Inverness
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Length: 5m +
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You have suzukis down on your profile, is this a 6m with one or two DF90's?
I probably still have more kit aboard though, everything down to the batteries is doubled up plus it has a double width console containing a fair amount of spares along with 90lts of fuel.
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Old 07 March 2010, 17:31   #14
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Country: UK - England
Town: NW& wherever the boat is!
Boat name: depends on m'mood!
Make: Humbers/15-24m cats
Length: 6m +
Engine: etec130/big volvos
MMSI: many and various
Join Date: Nov 2001
Posts: 1,815
6m destroyer with single df90 sooosoooki
1 Single deluxe consol or whatever they call it double seat pod behind that. Built in 90 l tank, two 30 l portable tanks and the training kit and all the gear two women consider compulsory for a blast across the bay in cold cold weather.
How is the double consol Bruce?? Do you find that the boat is wide enough for it?
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Old 07 March 2010, 18:07   #15
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Posts: 1,908
The console fits fine with a bit of care, so much so that Humber decided it was possible after all and stuck a pic of the boat on their site.
I suspect air resistance and weight are behind the performance figures between the hulls, my console and kit puts a lot of weight forward plus the anchor locker up front is pretty crowded. There is also an aux, it all adds up to a fairly heavy setup but its all needed because I operate fairly regularly in remote areas.
My motor is due a service so I'll ask them if anything is coming up on the computer as a problem when they do it.
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Old 08 March 2010, 06:25   #16
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Country: UK - England
Town: NW& wherever the boat is!
Boat name: depends on m'mood!
Make: Humbers/15-24m cats
Length: 6m +
Engine: etec130/big volvos
MMSI: many and various
Join Date: Nov 2001
Posts: 1,815
weight possibly but we did have 4 people on board. All top speeds were achieved with the maximum amount of "up-trim" we could get before it started ventilating. Our Ocean Pro is more susceptible to trim than the destroyer and the limiting factor on that one is usually chine walking before ventilation.
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