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Old 08-04-2009, 02:06 PM   #1
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Country: UK
Occupation: Designin' Stuff
Interests: Boating/4x4s/Fast Cars
Boat name: Namotu
Boat make: Extreme 24
Engines: 383 Mag Stroker
Cruising area: Channel Isles

Join Date: Aug 2008
Posts: 557
Prop Choice

Hello everyone...

Just after a bit of info regarding prop choice...

The boat is a Ring 21C
Engine is a brand new 200hp Mercury Optimax
Current prop is a 22pitch Laser 2
The bullet(?) of the gearbox is almost in line with the bottom of the hull... at max, 1" below...

The boat is doing 50.9 knots at 5500 RPM and has no problems getting onto the plane or reaching these revs...

What prop would people recomend I try?

Many thanks for the info,

Andy
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Old 08-04-2009, 09:19 PM   #2
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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
Firstly the 22 is a small dia (13 1/2) so a 21 x 14 1/4 would be a good place to start ?? Although with engine that high you should be able to run at least a 23 at 6000rpm plus !! I assume it has the std 1.87:1 gearbox.

I have a 21 Laser, 21 Yam Pro series & 23 Pro series you could try if you can arrange to collect them.

Good Luck

Bob
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Old 08-04-2009, 10:46 PM   #3
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Country: mauritius
Location: flic en flac
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Engines: some mercs
Cruising area: indian ocean

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Quote:
Originally Posted by andy21 View Post
The boat is a Ring 21C
Engine is a brand new 200hp Mercury Optimax
Current prop is a 22pitch Laser 2
The bullet(?) of the gearbox is almost in line with the bottom of the hull... at max, 1" below...

The boat is doing 50.9 knots at 5500 RPM and has no problems getting onto the plane or reaching these revs...

What prop would people recomend I try?
... your actually slip is about 9%
... laserII 21" would be a good choice, chopper 24" would be worth a test too
Quote:
Originally Posted by OCRDA View Post
6000rpm plus !!
... optimax 200 has a rev limiter around 5600 if i remember right
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