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Old 04-05-2012, 08:27 PM   #1
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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

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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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Old 04-05-2012, 08:48 PM   #2
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What gearcase & ratio , bullet height, jackplate ?
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Old 04-05-2012, 08:57 PM   #3
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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
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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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Old 04-05-2012, 08:58 PM   #4
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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: 1,170
An standard gearcase so 1:87:1 I think
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Old 04-05-2012, 09:36 PM   #5
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Country: England
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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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Old 04-05-2012, 09:39 PM   #6
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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: 1,170
Quote:
Originally Posted by maz928 View Post
I'm sure the 135hp & 150 hp opti's are 2.1 ratio boxes and the 175hp & 200hp are 1.86
I'm always more than happy to stand corrected
:-)
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Old 04-05-2012, 10:21 PM   #7
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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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Old 05-05-2012, 11:36 AM   #8
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26 chopper or little smaller will lift the nose and get it rolling !!
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Old 05-05-2012, 11:45 AM   #9
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21 lazer ! Or for top speed 24 raker 1
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Old 05-05-2012, 10:51 PM   #10
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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: 1,170
22" lazer 6,000 52.5mph
21" pro vee 5,500 54mph
23" trophy plus 58.5mph
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Old 05-05-2012, 10:58 PM   #11
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Boat name: Slayer II, Slayer, Pen15
Boat make: Phantom 19G-R, Bernico F2 Extreme, Ring 15
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I have a thinned 24"raker 1 that I'd swap for the 25" pro v!
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Old 05-05-2012, 11:27 PM   #12
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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: 1,170
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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Old 06-05-2012, 12:33 AM   #13
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Engines: 150 HO etec
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The 13.5 rakers are for 4 1/4" gearcases so v4 etc.
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Old 06-05-2012, 01:53 AM   #14
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Country: Guernsey
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Boat name: Slayer II, Slayer, Pen15
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14.5" I think and standard V6 splines, I'll check tomorrow
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Old 06-05-2012, 02:36 AM   #15
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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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Old 07-05-2012, 03:56 PM   #16
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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: 1,170
Would appear that 4 bladers are giving much better results after another evenings testing
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Old 08-05-2012, 09:07 AM   #17
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Location: Norfolk
Occupation: Electrician
Interests: Ski racing
Boat name: ????????
Boat make: Bernico f3
Engines: 150 optimax
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Are those speeds with a skier
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Old 08-05-2012, 09:39 AM   #18
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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: 1,170
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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