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24-03-2006, 05:51 PM
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#1
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Registered User
Country: england
Location: the grim north
Occupation: robot
Cruising area: tyne
Join Date: Nov 2004
Location: the grim north
Posts: 915
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What prop on a phantom 16
What pitch props do people run on phantom 16s .This boat has a merc 135 on it and is running a 23" lazer reving out at 5200. Engine should go to about 5600. i know proping down would get the revs up but a 20"/21" seeems small to me. the owner wants more top end.
cheers dan
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Speed costs weight so what do we cut off first 
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24-03-2006, 07:46 PM
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#2
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Senior Member
Country: UK
Location: Devon
Occupation: Garage Proprietor
Interests: PowerBoat Racing
Boat name: If Only
Boat make: Bernico F3 OCR, Bernico Prototype Inboard, and some Ribs
Engines: Yamaha Pro V 115
Cruising area: UK, France
Join Date: Jan 2005
Location: Devon
Posts: 3,095
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Prop
Depends on engine height !! but try a small hub 24" laser !! the smaller dia will get the revs up & should increase the speed
Bob
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If Only
National Outboard Immersed Propeller Mono Record 103mph
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25-03-2006, 09:19 AM
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#3
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Registered User
Country: england
Location: the grim north
Occupation: robot
Cruising area: tyne
Join Date: Nov 2004
Location: the grim north
Posts: 915
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Re: Prop
Quote:
Originally posted by OCRDA
Depends on engine height !! but try a small hub 24" laser !! the smaller dia will get the revs up & should increase the speed
Bob
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thanks what is the small hub the 75hp- 125hp prop
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Speed costs weight so what do we cut off first
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25-03-2006, 09:27 AM
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#4
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Senior Member
Country: UK
Location: Devon
Occupation: Garage Proprietor
Interests: PowerBoat Racing
Boat name: If Only
Boat make: Bernico F3 OCR, Bernico Prototype Inboard, and some Ribs
Engines: Yamaha Pro V 115
Cruising area: UK, France
Join Date: Jan 2005
Location: Devon
Posts: 3,095
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Prop
Yes !!
__________________
If Only
National Outboard Immersed Propeller Mono Record 103mph
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27-03-2006, 08:19 PM
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#5
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Registered User
Country: England
Location: Kent
Occupation: Train Engineer
Interests: Refit/Re-engine Woody's P18 and helping with D2S.
Boat name: Fugazi II / D2S
Boat make: Phantom 18 / Planatec 41'
Engines: 1xMercury XR2 / 2x 8.1ltr Chevys
Cruising area: Kent/Hampshire/Dorset Coasts
Join Date: Aug 2005
Location: Kent
Posts: 411
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I used to run a 23 Yamaha Thru Hub Competition prop on my offshore 1.3L P16.
I also had a 25 Over hub cleaver but found that very torquey.
Graham.
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01-04-2006, 08:02 PM
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#6
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Registered User
Country: England
Location: Crayford, Kent.
Occupation: Electrical gezza!
Interests: Petrolhead
Boat name: Wayne Kerr
Boat make: Phantom xl
Engines: Mercury 2.5, 200(ish)
Cruising area: Essex, Hampshire, Mediterranean
Join Date: Sep 2004
Location: Crayford, Kent.
Posts: 1,199
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Re: Prop
Quote:
Originally posted by OCRDA
Depends on engine height !! but try a small hub 24" laser !! the smaller dia will get the revs up & should increase the speed
Bob
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Small Hub? What about the exhaust gases exiting into the blades? Cavitation ?????
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01-04-2006, 08:14 PM
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#7
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Senior Member
Country: UK
Location: Devon
Occupation: Garage Proprietor
Interests: PowerBoat Racing
Boat name: If Only
Boat make: Bernico F3 OCR, Bernico Prototype Inboard, and some Ribs
Engines: Yamaha Pro V 115
Cruising area: UK, France
Join Date: Jan 2005
Location: Devon
Posts: 3,095
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Re: Re: Prop
Quote:
Originally posted by Wayne Kerr
Small Hub? What about the exhaust gases exiting into the blades? Cavitation ?????
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Yes & Awesome acceleration !! More pitch = More speed , Smaller Dia = Higher RPM !!
__________________
If Only
National Outboard Immersed Propeller Mono Record 103mph
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01-04-2006, 08:20 PM
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#8
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Registered User
Country: England
Location: Crayford, Kent.
Occupation: Electrical gezza!
Interests: Petrolhead
Boat name: Wayne Kerr
Boat make: Phantom xl
Engines: Mercury 2.5, 200(ish)
Cruising area: Essex, Hampshire, Mediterranean
Join Date: Sep 2004
Location: Crayford, Kent.
Posts: 1,199
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Re: Re: Re: Prop
Quote:
Originally posted by OCRDA
Yes & Awesome acceleration !! More pitch = More speed , Smaller Dia = Higher RPM !!
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Roger Bob 
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01-04-2006, 09:47 PM
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#9
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Registered User
Country: uk
Location: Bristol area
Occupation: Electrician
Interests: mmm stella
Boat make: 16 reiver
Engines: mercury 125 optimax
Cruising area: Lyme Bay
Join Date: Mar 2006
Location: Bristol area
Posts: 344
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I'd like to try a 21 or a 22 over the hub prop on my boat does any one have one? to fit a suzuki which is th same as omc i think
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