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18-02-2007, 06:57 PM
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#1
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Registered User
Country: uk
Location: dorset
Interests: wasting money on boats
Boat name: aquilla .
Boat make: Superhawk 40. Ring 21E. Seadoo gtx. Windy Khamsin
Engines: Kad 300s. 300xs Dbr .d6 370 230 4tec
Cruising area: corfu
Join Date: Mar 2004
Location: dorset
Posts: 570
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air
saw this today very intresting
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18-02-2007, 07:14 PM
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#2
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Registered User
Join Date: Mar 2004
Posts: 5,724
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Quote:
Originally Posted by Rockey
saw this today very intresting
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what's the purpose ? to vent the prop?
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18-02-2007, 07:24 PM
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#3
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Registered User
Country: uk
Location: dorset
Interests: wasting money on boats
Boat name: aquilla .
Boat make: Superhawk 40. Ring 21E. Seadoo gtx. Windy Khamsin
Engines: Kad 300s. 300xs Dbr .d6 370 230 4tec
Cruising area: corfu
Join Date: Mar 2004
Location: dorset
Posts: 570
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Quote:
Originally Posted by Gav
what's the purpose ? to vent the prop?
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that's what i thought, i assume it's got a yanmar in it, think it was a goldfish rib
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18-02-2007, 07:29 PM
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#4
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Registered User
Join Date: Mar 2004
Posts: 5,724
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Quote:
Originally Posted by Rockey
that's what i thought, i assume it's got a yanmar in it, think it was a goldfish rib
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doing a similar job to what the notch in the 600 does.... allowing the motor to rev higher during hole shot .
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18-02-2007, 07:38 PM
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#5
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Registered User
Join Date: Mar 2004
Posts: 6,891
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19-02-2007, 07:51 AM
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#6
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Aged Member
Country: UK
Location: HAMPSHIRE
Occupation: Safety Engineering
Boat name: Savannah
Boat make: Princess 415
Engines: Volvos
Cruising area: SOLENT
Join Date: Oct 2004
Location: HAMPSHIRE
Posts: 779
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Land was invented to give boats somewhere to visit
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19-02-2007, 08:29 AM
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#7
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Registered User
Country: United kingdom
Location: West Sussex
Occupation: Grease Monkey
Interests: Makin my boat faster!
Boat name: S.B Racing
Boat make: Ocke mannerfelt canopied B23 / Zapcat
Engines: Merc 200XS Gen 2 / Tohatsu 50
Cruising area: littlehampton/Southampton
Join Date: Jan 2005
Location: West Sussex
Posts: 2,656
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WTF? 
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Class 3C Mono EPA National speed record holder 95.35 mph Avg!
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19-02-2007, 12:28 PM
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#8
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Registered User
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer
Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,351
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shirley you would want to vent infront of the prop and not behind it????????
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19-02-2007, 12:40 PM
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#9
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Aged Member
Country: UK
Location: HAMPSHIRE
Occupation: Safety Engineering
Boat name: Savannah
Boat make: Princess 415
Engines: Volvos
Cruising area: SOLENT
Join Date: Oct 2004
Location: HAMPSHIRE
Posts: 779
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Exactly !
I was thinking it was related to top bearing cooling.....not much point in aerating the water behind you......
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Land was invented to give boats somewhere to visit
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19-02-2007, 01:26 PM
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#10
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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I reckon it would be possible to ventilate the prop from that position.
And, the fat bit in the pipe near the top, is probably a non return valve to stop it ejaculating water out the top of the pipe when reversing.
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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19-02-2007, 02:49 PM
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#11
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Pension Dodger
Country: UK
Location: KENT
Occupation: IT
Interests: Offshore water ski racing
Cruising area: !!!!!!!!!
Join Date: May 2004
Location: KENT
Posts: 442
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Prop venting USA style
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19-02-2007, 03:11 PM
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#12
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Registered User
Join Date: Mar 2004
Posts: 5,724
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looks to me like a more direct way to vent the prop rather than having the vent in the hull/notch, thus removing the need for forward motion to produce ventilation.... by the looks of the first pic, as the prop blade swings past the vent orofice it would naturally start pulling air. just MHO of course!
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19-02-2007, 04:08 PM
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#13
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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Quote:
Originally Posted by dbe1
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Yes, but they're IMCO lowers(and uppers I think), so a different shape to a stock Bravo and even looks to have a prop venting port built into the drive casting.
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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