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Old 01 September 2009, 14:06   #21
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Country: Netherlands
Town: friesland
Boat name: smokkelaer
Make: revenger
Length: 7m +
Engine: 225 Optimax
Join Date: Jan 2005
Posts: 279
I have had one.
We took it from Northern Holland to Isle of wight and beyond.
Had it for three years and have sold it.
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Old 28 April 2010, 13:39   #22
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Country: UK - England
Town: penryn
Boat name: purple haze
Make: vector
Length: 7m +
Engine: inboard cosworth 300
Join Date: Apr 2009
Posts: 52
cosworth

had the rib out for a couple of shakedown runs
ran it upto 5000rpm and got 40mph with exhaust temp 920 water 70 boost press 5psi
water injection was not cutting in as boost to low
adjusted pressure switch and ran again ex temp 820
checked over boat and changed gear oil and ran the following weekend
ran upto 5500 rpm exh temp upto 890
ran 6000 rpm 50mph exh temp 865
temp starting to drop with higher rpm or pos less drag on hull ,it was a bit to rough to go any faster 3-4 foot choppy swell
back out this weekend will try for 6500 and 7000rpm and record some info
engine setup is for 21psi boost max but it looks like the prop will need some more pitch as its getting to 6000rpm on 60-70% throttle and 6psi boost
will post some pics next week
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Old 28 April 2010, 14:12   #23
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Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,841
Quote:
Originally Posted by cosworth mirage View Post
had the rib out for a couple of shakedown runs
ran it upto 5000rpm and got 40mph with exhaust temp 920 water 70 boost press 5psi
water injection was not cutting in as boost to low
adjusted pressure switch and ran again ex temp 820
checked over boat and changed gear oil and ran the following weekend
ran upto 5500 rpm exh temp upto 890
ran 6000 rpm 50mph exh temp 865
temp starting to drop with higher rpm or pos less drag on hull ,it was a bit to rough to go any faster 3-4 foot choppy swell
back out this weekend will try for 6500 and 7000rpm and record some info
engine setup is for 21psi boost max but it looks like the prop will need some more pitch as its getting to 6000rpm on 60-70% throttle and 6psi boost
will post some pics next week
Sounds good.
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Old 06 May 2010, 17:44   #24
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Country: UK - England
Town: penryn
Boat name: purple haze
Make: vector
Length: 7m +
Engine: inboard cosworth 300
Join Date: Apr 2009
Posts: 52
Testing

Went out on sunday for some more trials 6500rpm and 7000 runs, also altered the water injection as well.
nice choppy 3ft sea made testing good fun but seams to affect the speedo,running at 6500-7000 the exhaust temperature has now dropped to 800c, water remains at 70c, boost pressure 6psi, Im really pleased with the progress in speed but also the efficiency shown by the low exhaust temp and the low boost 6psi this is probably about 170hp. We also tried some 3000 to 7000 acceleration runs with higher boost 15psi and it,s a white knuckle ride.
Looking at changing the prop now to increase the speed and load on the engine so i can start adding some more boost and power
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Old 06 May 2010, 17:47   #25
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Country: UK - England
Boat name: llyn raider
Make: xs
Length: 7m +
Engine: 1 200hp merc
Join Date: Nov 2006
Posts: 211
sounds like your cracking along well with it. i would look into a gps for speed as well. far more accurate and a bit less temperamental
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Old 06 May 2010, 18:03   #26
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Country: UK - England
Town: penryn
Boat name: purple haze
Make: vector
Length: 7m +
Engine: inboard cosworth 300
Join Date: Apr 2009
Posts: 52
speed

Trying to pace the speed and power increases to keep the boat in a reliable setup,the aim is for a fast boat over longer distances offshore than the ultimate top speed as this is what the xr design excel at,with an evinrude 225 they used to get 52kn if i can get above this then i,d be delighted .
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Old 07 May 2010, 09:46   #27
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Country: UK - England
Town: penryn
Boat name: purple haze
Make: vector
Length: 7m +
Engine: inboard cosworth 300
Join Date: Apr 2009
Posts: 52
Pics

some more pictures
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Old 12 May 2010, 12:24   #28
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Country: UK - England
Town: penryn
Boat name: purple haze
Make: vector
Length: 7m +
Engine: inboard cosworth 300
Join Date: Apr 2009
Posts: 52
prop

new prop on way, gone for a 3 blade cleaver will post some pic,s whilst its still shiny and new
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Old 01 June 2010, 16:03   #29
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Country: UK - England
Town: penryn
Boat name: purple haze
Make: vector
Length: 7m +
Engine: inboard cosworth 300
Join Date: Apr 2009
Posts: 52
More testing

Had to machine the new prop to clear the rear seal housing so delayed the next test a bit, also changed the seawater filter which kept blowing its lid at speed.
ran the boat upto 5200 rpm and got 45 kn on gps showed 55mph on speedo which looks like the prop is in the ball park, ran with 12psi boost which is around 200hp its still got about 150lt fuel in it so there is more to come.
looking at the engine coolant temp the in temp is 65c and the outlet is 125c which is a bit concerning i think the thermostat is slowing the coolant flow due to the cooling effect of the incoming coolant on the stat so will remove it before the next run.
Also the steering was feeling a bit sketchy and looking at it there is some play in the pivot on the mid section so will do this before next run.
Once these problems are ironed out I will add a bit more boost and then !!!!!!!!!!!!!!!!!!!
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Old 02 June 2010, 03:47   #30
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Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
Quote:
Originally Posted by cosworth mirage View Post
Had to machine the new prop to clear the rear seal housing so delayed the next test a bit, also changed the seawater filter which kept blowing its lid at speed.
Good luck with the boat - I'm looking forward to hear how it all ends up - may even be worth a story in the magazine when it's up and running flat out? Have a look here for a water strainer - there are different options and more than one supplier of course!
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Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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