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20-07-2014, 07:48 PM
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#241
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Registered User
Country: UK
Location: East Mids
Occupation: MD hydraulic/engineering company
Interests: Fast cars, bikes,quads, boats, going fast...etc
Boat name: Cheetah
Boat make: Hunton XRS37
Engines: Volvo D6 with DPR drives
Cruising area: So'hampton
Join Date: Sep 2006
Location: East Mids
Posts: 557
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Quote:
Originally Posted by NorwegianBoater
Peter I am in awe! What a project.
What effects, if any, do you expect from the cutting of the cavitation plates?
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Thanks Norwegian Boater
Both cavitation plates were fractured above the front prop so i figured that it was probably causing quite a lot of drag it also saves about 4kilos per drive in weight, so as the boat gets on the plane really easily i thought it a worth while experiment, i did however keep the parts so i can weld them back on if necessary.
Peter
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20-07-2014, 07:55 PM
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#242
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Registered User
Country: england
Location: southampton
Occupation: engineer
Interests: lots
Boat make: scorpion 8.1
Engines: 250HO
Cruising area: solent
Join Date: Mar 2004
Location: southampton
Posts: 1,353
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Quote:
Originally Posted by peterunwin
Hi Glen,
The two smaller pipes are overflows from the raw water cooling system, there is a cool collar on the exhaust with six 3mm holes drilled into it to allow sufficient water to cool the exhaust the balance overflows via the two small pipes. The cooling system is heavily modified and has the absolute minimum of back pressure as i have found that volume of water is way more important than pressure for good heat exchange. The reason you are not seeing an increase in volume of water when i rev the engines is because i am only feeding them with a 1/2" hose which is no where near enough volume even at idle.
Peter
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Thanks. appreciate your explanation
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20-07-2014, 08:31 PM
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#243
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Registered User
Country: Norway
Location: Oslo, Aberdeen
Occupation: Time
Interests: a lot...
Boat make: Gilbert 22 Offshore Edition
Engines: Merc
Cruising area: Oslofjord-Sweden-Denmark
Join Date: Jan 2007
Location: Oslo, Aberdeen
Posts: 232
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Quote:
Originally Posted by peterunwin
Thanks Norwegian Boater
Both cavitation plates were fractured above the front prop so i figured that it was probably causing quite a lot of drag it also saves about 4kilos per drive in weight, so as the boat gets on the plane really easily i thought it a worth while experiment, i did however keep the parts so i can weld them back on if necessary.
Peter
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Interesting, cannot wait to see the result!
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If anybody knows how to get in touch with Powertran pls pm me
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20-07-2014, 09:40 PM
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#244
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Registered User
Join Date: Apr 2012
Posts: 3
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Quote:
Originally Posted by peterunwin
Thanks Lemz,
The raw water system is only under vacuum at low speeds at high speeds the ram effects from the intakes overcomes the volume that the pump can move and becomes a metering unit, when the boat leaves and re-enters the water you can get quite big pressure spikes on re-entry and with the large pipe work i am running to reduce the speed of water, if you don't have a relief valve it could burst the strainers or hose work or even blow the lids of the strainers… i have had this happen on a couple of occasions until i have found a cure.
Peter
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Thanks for explanation. How much do you think you have managed to increase the water flow by? I noticed that you have put d6-475 stickers on the covers. Is this currently what you have remapped the engines too? Do you think the engines are capable of >500hp? Or will the cooling system struggle to keep the temp down?
Tim
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25-07-2014, 08:59 PM
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#245
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Registered User
Country: UK
Location: East Mids
Occupation: MD hydraulic/engineering company
Interests: Fast cars, bikes,quads, boats, going fast...etc
Boat name: Cheetah
Boat make: Hunton XRS37
Engines: Volvo D6 with DPR drives
Cruising area: So'hampton
Join Date: Sep 2006
Location: East Mids
Posts: 557
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Quote:
Originally Posted by Lemz
Thanks for explanation. How much do you think you have managed to increase the water flow by? I noticed that you have put d6-475 stickers on the covers. Is this currently what you have remapped the engines too? Do you think the engines are capable of >500hp? Or will the cooling system struggle to keep the temp down?
Tim
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Hi Tim,
The water flow increase is significant but i don't want to put figures on it, if you remember the old engines had smaller water pump pulleys this in fact made no difference the reason being that the back pressure through the heat exchanger and charge cooler was sufficient to push the impeller blades of the rotor housing, so regardless of rpm i couldn't get anymore flow through them. On the new system however as well as the pipework being a very large bore with swept elbows the heat exchanger and charge cooler have significantly less pressure drop through them, also the old engines required 40lb of boost to make 400hp, the new 435's only require 29.5lbs of boost for 435hp.I am running them standard at the moment and my guess is with the big exhausts and the improved cooling they will make close to 450hp. As soon as i have established there are no warranty issues i will switch the ECU'S and increase the common rail pressure by 150 bar, at the same time the new ECU'S will give an extra 200rpm, horsepower should rise to circa 500 but i am being pessimistic on my claims on the carbon cam covers.
Peter
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25-07-2014, 09:06 PM
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#246
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Registered User
Country: UK
Location: East Mids
Occupation: MD hydraulic/engineering company
Interests: Fast cars, bikes,quads, boats, going fast...etc
Boat name: Cheetah
Boat make: Hunton XRS37
Engines: Volvo D6 with DPR drives
Cruising area: So'hampton
Join Date: Sep 2006
Location: East Mids
Posts: 557
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Hi All,
Cheetah gets her carbon front trim wing permanently installed:huge grin:
Peter
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08-08-2014, 06:57 PM
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#247
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Registered User
Country: UK
Location: East Mids
Occupation: MD hydraulic/engineering company
Interests: Fast cars, bikes,quads, boats, going fast...etc
Boat name: Cheetah
Boat make: Hunton XRS37
Engines: Volvo D6 with DPR drives
Cruising area: So'hampton
Join Date: Sep 2006
Location: East Mids
Posts: 557
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Hi All,
Cheetah gets part of her new livery :huge grin: not long now before she gets wet..
Peter
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08-08-2014, 08:18 PM
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#248
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Registered User
Join Date: Oct 2007
Posts: 1,374
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Sorry to say but that wing looks awfull
Fare play to try new things but I can't understand what it's going to achieve.
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08-08-2014, 08:44 PM
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#249
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Registered User
Location: Reading
Occupation: Automotive parts Distribution
Boat make: Hunton 36
Join Date: Sep 2006
Location: Reading
Posts: 47
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like the graphics. If you do not mind asking where did you get them from ?
Looking forward to seeing you out on the water
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09-08-2014, 05:22 PM
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#250
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Registered User
Country: UK
Location: East Mids
Occupation: MD hydraulic/engineering company
Interests: Fast cars, bikes,quads, boats, going fast...etc
Boat name: Cheetah
Boat make: Hunton XRS37
Engines: Volvo D6 with DPR drives
Cruising area: So'hampton
Join Date: Sep 2006
Location: East Mids
Posts: 557
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Quote:
Originally Posted by hunton69
Sorry to say but that wing looks awfull
Fare play to try new things but I can't understand what it's going to achieve.
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If we were all blessed with the same sense of adventure we would still be riding round in coracles.
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09-08-2014, 05:28 PM
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#251
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Registered User
Country: UK
Location: East Mids
Occupation: MD hydraulic/engineering company
Interests: Fast cars, bikes,quads, boats, going fast...etc
Boat name: Cheetah
Boat make: Hunton XRS37
Engines: Volvo D6 with DPR drives
Cruising area: So'hampton
Join Date: Sep 2006
Location: East Mids
Posts: 557
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Quote:
Originally Posted by Ian H
like the graphics. If you do not mind asking where did you get them from ?
Looking forward to seeing you out on the water
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Thanks Ian,
The graphics are a tweaked version of the ones we developed with Dan from Premier Vehicle Wrapping for Carbon Cheetah, we got the name on today
Peter
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10-08-2014, 08:45 AM
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#252
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Registered User
Country: england
Location: southampton
Occupation: engineer
Interests: lots
Boat make: scorpion 8.1
Engines: 250HO
Cruising area: solent
Join Date: Mar 2004
Location: southampton
Posts: 1,353
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love the graphics. Have I missed pics of upholstery?
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10-08-2014, 11:02 AM
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#253
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Registered User
Country: UK
Location: East Mids
Occupation: MD hydraulic/engineering company
Interests: Fast cars, bikes,quads, boats, going fast...etc
Boat name: Cheetah
Boat make: Hunton XRS37
Engines: Volvo D6 with DPR drives
Cruising area: So'hampton
Join Date: Sep 2006
Location: East Mids
Posts: 557
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Quote:
Originally Posted by glen76
love the graphics. Have I missed pics of upholstery?
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Thanks Glen, in my rush to get the boat ready for the graphics i forgot to take any pictures of the upholstery, will get some next weekend as i have been rained of today.
Peter
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15-08-2014, 08:24 PM
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#254
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Registered User
Country: UK
Location: East Mids
Occupation: MD hydraulic/engineering company
Interests: Fast cars, bikes,quads, boats, going fast...etc
Boat name: Cheetah
Boat make: Hunton XRS37
Engines: Volvo D6 with DPR drives
Cruising area: So'hampton
Join Date: Sep 2006
Location: East Mids
Posts: 557
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Hi All,
Fitted Cheetah's seats and side panels also fabricated a stainless steel bracket to hold the steering joy stick so i can now use the steering wheel or the joy stick for steering. We also finished of the starboard side graphics.
Peter
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16-08-2014, 08:47 AM
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#255
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Registered User
Location: hayling island
Boat name: snow monkey
Boat make: extreme 24
Engines: mercruiser 6.2
Join Date: May 2004
Location: hayling island
Posts: 2,082
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beautiful work,but that wing isnt for me
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16-08-2014, 03:58 PM
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#256
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Registered User
Location: Bournemouth
Join Date: Mar 2004
Location: Bournemouth
Posts: 391
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If Scotland split from the UK, you'll have to get rid of the blue
Looks great by the way
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You can never go fast enough...
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17-08-2014, 07:46 AM
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#257
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Registered User
Country: England
Location: Southampton
Occupation: Electromechanical Engineer
Interests: Bikes, boats and engines etc.
Boat make: Cobra RIB
Engines: Mercury Optimax
Cruising area: Solent
Join Date: Oct 2006
Location: Southampton
Posts: 252
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Looking really good Pete.....
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19-08-2014, 03:44 PM
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#258
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Too many projects.....
Country: UK
Location: Warsash
Occupation: Sunseeker Sales @ Swanwick
Interests: Making things go fast....
Boat name: Top Gun
Boat make: Sunseeker Hawk 27
Engines: 2x Volvo Penta 5.7 V8s
Cruising area: South Coast
Join Date: Sep 2007
Location: Warsash
Posts: 221
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Quote:
Originally Posted by peterunwin
Hi All,
Fitted Cheetah's seats and side panels also fabricated a stainless steel bracket to hold the steering joy stick so i can now use the steering wheel or the joy stick for steering. We also finished of the starboard side graphics.
Peter
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Lovely work but the fuel tank looks a bit small
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19-08-2014, 03:45 PM
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#259
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The Doc
Join Date: Mar 2004
Posts: 8,291
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Quote:
Originally Posted by pugracer285
Lovely work but the fuel tank looks a bit small
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No Silly, its fly by wire fuelling
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26-08-2014, 05:35 PM
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#260
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Registered User
Country: UK
Location: Southampton UK
Occupation: applied scientist/applied mathematician/electronics engineer/dynamics & control system specialist
Join Date: Feb 2010
Location: Southampton UK
Posts: 11
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Quote:
Originally Posted by peterunwin
Hi All,
Cheetah gets her carbon front trim wing permanently installed:huge grin:
Peter
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Peter, I do wonder if painting or coating the bow-wing support Team Unwin Red would make it appear far more integral to the boat structure, rather than a mechanical add-on.
Also perhaps a subtle red stripe or two along the outer wing endplates would reflect the general bow lines and paintwork.
Do like your joystick steering override arrangement. Very tidy and practical.
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