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04-05-2012, 07:27 PM
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#1
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Registered User
Country: engalnd
Location: south west
Interests: ski racing
Boat name: Jack'd up, hellraiser
Boat make: Bernico 19 ET, ring 16
Engines: merc 135, merc 175, yam 90
Cruising area: Plymouth
Join Date: Jun 2006
Location: south west
Posts: 1,176
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Prop advice for a P21
Ok
I know that this is difficult, but I'm at a bit of a loss now
The boat is an early, 1982 p21 hull. 150 optimax engine
We have tried so far
A 23 powertech 4 blade prop 56-57mph nearly 6,000 rpm
A 24 worked chopper 58-59 in the rough 5,600 rpm but only managed 52-53mph in the flat today at 5,500rpm
A 25" pro vee 54mph 5,500rpm
Have a few lazers to try tomorrow along with a 20" chopper which I think will be too short
We are only looking for out an out speed on this one so bow lift is quite essential
Any more specific info required please let me know
Thanks
Chris
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04-05-2012, 07:48 PM
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#2
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Le Cat
Country: France
Location: Paris
Occupation: Computer Sales
Boat name: Le Cat
Boat make: Argo Cat 18
Engines: Mercury 2.4EFI
Cruising area: Paris
Join Date: Mar 2004
Location: Paris
Posts: 753
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What gearcase & ratio , bullet height, jackplate ?
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04-05-2012, 07:57 PM
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#3
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Registered User
Country: engalnd
Location: south west
Interests: ski racing
Boat name: Jack'd up, hellraiser
Boat make: Bernico 19 ET, ring 16
Engines: merc 135, merc 175, yam 90
Cruising area: Plymouth
Join Date: Jun 2006
Location: south west
Posts: 1,176
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Point of bullet is 2 inches below the bottom of the hull, an no jack plate, engine height is second bolt hole from the bottom, so high... But the transom has been cut 6 inches
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04-05-2012, 07:58 PM
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#4
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Registered User
Country: engalnd
Location: south west
Interests: ski racing
Boat name: Jack'd up, hellraiser
Boat make: Bernico 19 ET, ring 16
Engines: merc 135, merc 175, yam 90
Cruising area: Plymouth
Join Date: Jun 2006
Location: south west
Posts: 1,176
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An standard gearcase so 1:87:1 I think
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04-05-2012, 08:36 PM
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#5
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Registered User
Country: England
Location: Poole
Interests: Boats/cars
Boat make: Boss 21/Argentinian HotBoat
Engines: Mercury 2.5 Offshore
Cruising area: Poole/Solent
Join Date: Jul 2007
Location: Poole
Posts: 325
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I'm sure the 135hp & 150 hp opti's are 2.1 ratio boxes and the 175hp & 200hp are 1.86
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04-05-2012, 08:39 PM
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#6
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Registered User
Country: engalnd
Location: south west
Interests: ski racing
Boat name: Jack'd up, hellraiser
Boat make: Bernico 19 ET, ring 16
Engines: merc 135, merc 175, yam 90
Cruising area: Plymouth
Join Date: Jun 2006
Location: south west
Posts: 1,176
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Quote:
Originally Posted by maz928
I'm sure the 135hp & 150 hp opti's are 2.1 ratio boxes and the 175hp & 200hp are 1.86
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I'm always more than happy to stand corrected
:-)
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04-05-2012, 09:21 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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24 or maybe a 26 Laser !! Could also try 24 x 13 1/2 Raker or 23 Pro Series. If you want to try any give me a call !!
Bob
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If Only
National Outboard Immersed Propeller Mono Record 103mph
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05-05-2012, 10:36 AM
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#8
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Registered User
Country: uk
Location: devon
Occupation: costruction
Interests: power boats
Boat name: smokin aces
Boat make: x cat
Engines: mercs
Cruising area: lyme bay
Join Date: Mar 2004
Location: devon
Posts: 389
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26 chopper or little smaller will lift the nose and get it rolling !!
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05-05-2012, 10:45 AM
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#9
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Registered User
Country: uk
Location: salcombe
Occupation: semi retired
Interests: racing(middle east class 3 6l)
Boat name: still no worries
Boat make: phantom18
Engines: 2.5 efi
Cruising area: salcombe
Join Date: Dec 2007
Location: salcombe
Posts: 499
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21 lazer ! Or for top speed 24 raker 1
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05-05-2012, 09:51 PM
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#10
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Registered User
Country: engalnd
Location: south west
Interests: ski racing
Boat name: Jack'd up, hellraiser
Boat make: Bernico 19 ET, ring 16
Engines: merc 135, merc 175, yam 90
Cruising area: Plymouth
Join Date: Jun 2006
Location: south west
Posts: 1,176
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22" lazer 6,000 52.5mph
21" pro vee 5,500 54mph
23" trophy plus 58.5mph
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05-05-2012, 09:58 PM
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#11
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Registered User
Country: Guernsey
Occupation: Postie
Interests: Heavy Heavy Metal
Boat name: Slayer II, Slayer, Pen15
Boat make: Phantom 19G-R, Bernico F2 Extreme, Ring 15
Engines: Evinrude 115HO, Yam 90
Cruising area: Channel Islands
Join Date: Aug 2009
Posts: 1,460
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I have a thinned 24"raker 1 that I'd swap for the 25" pro v!
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05-05-2012, 10:27 PM
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#12
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Registered User
Country: engalnd
Location: south west
Interests: ski racing
Boat name: Jack'd up, hellraiser
Boat make: Bernico 19 ET, ring 16
Engines: merc 135, merc 175, yam 90
Cruising area: Plymouth
Join Date: Jun 2006
Location: south west
Posts: 1,176
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Looking at it I think I'm going to be looking at a trophy... But what hub and diameter is the raker...?
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05-05-2012, 11:33 PM
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#13
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Registered User
Country: UK
Location: london
Occupation: Powerboat Skipper
Interests: Boats , bikes!
Boat name: Renegade
Boat make: GPV-RENEGADE
Engines: 150 HO etec
Cruising area: Thames, south coast, anywhere!
Join Date: Dec 2008
Location: london
Posts: 2,330
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The 13.5 rakers are for 4 1/4" gearcases so v4 etc.
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Im re branding pepper spray as Arsehole Repellant.im going to make a fortune.
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06-05-2012, 12:53 AM
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#14
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Registered User
Country: Guernsey
Occupation: Postie
Interests: Heavy Heavy Metal
Boat name: Slayer II, Slayer, Pen15
Boat make: Phantom 19G-R, Bernico F2 Extreme, Ring 15
Engines: Evinrude 115HO, Yam 90
Cruising area: Channel Islands
Join Date: Aug 2009
Posts: 1,460
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14.5" I think and standard V6 splines, I'll check tomorrow
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06-05-2012, 01:36 AM
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#15
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Registered User
Country: UK
Location: london
Occupation: Powerboat Skipper
Interests: Boats , bikes!
Boat name: Renegade
Boat make: GPV-RENEGADE
Engines: 150 HO etec
Cruising area: Thames, south coast, anywhere!
Join Date: Dec 2008
Location: london
Posts: 2,330
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14.5 will fit omc and suzuki 4.5" hub gearcases(v6). if you have a merc bush put in you need some washers made up for v6 and the bush spline and propshaft length are different
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Im re branding pepper spray as Arsehole Repellant.im going to make a fortune.
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07-05-2012, 02:56 PM
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#16
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Registered User
Country: engalnd
Location: south west
Interests: ski racing
Boat name: Jack'd up, hellraiser
Boat make: Bernico 19 ET, ring 16
Engines: merc 135, merc 175, yam 90
Cruising area: Plymouth
Join Date: Jun 2006
Location: south west
Posts: 1,176
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Would appear that 4 bladers are giving much better results after another evenings testing
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08-05-2012, 08:07 AM
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#17
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Registered User
Location: Norfolk
Occupation: Electrician
Interests: Ski racing
Boat name: ????????
Boat make: Bernico f3
Engines: 150 optimax
Cruising area: Hunstanton
Join Date: Sep 2006
Location: Norfolk
Posts: 188
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Are those speeds with a skier
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08-05-2012, 08:39 AM
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#18
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Registered User
Country: engalnd
Location: south west
Interests: ski racing
Boat name: Jack'd up, hellraiser
Boat make: Bernico 19 ET, ring 16
Engines: merc 135, merc 175, yam 90
Cruising area: Plymouth
Join Date: Jun 2006
Location: south west
Posts: 1,176
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Not all, but with the trophy, laser and an offshore we tried the speed didn't alter with or without skiier! I know were still off the the likes of yours and cyclones but I'm not sure there's much more left to come
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