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Old 07-06-2013, 09:52 PM   #1
Cracker jack
 
Country: england
Location: hertfordshire
Occupation: Roofer
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Boat name: Cracker Jack
Boat make: Extreme 21
Engines: 5.7
Cruising area: hayling island

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Location: hertfordshire
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Laser 20 or 21

How much difference in performance between a 20 21p on a merc 200 on ring 20
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Old 08-06-2013, 06:48 AM   #2
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Hub Sizes

Quote:
Originally Posted by bling ring View Post
How much difference in performance between a 20 21p on a merc 200 on ring 20
I think you will find the 21 is a large hub and the 20 a small hub so you will probably notice quite a difference not necessarily an improvement-check your gearbox casing size. I would have thought you would be better of with a 23 as this should give 65-70 mph with 200hp and a sensible pull out (holeshot),the 21 will give a good pull out but probably over rev.I hope this helps.Nic
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Old 08-06-2013, 08:51 AM   #3
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Country: england
Location: windsor
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Boat name: trampon
Boat make: phantom 21
Engines: merc 230 drag
Cruising area: solent

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I had a 21p on my phantom 21 with a merc 200 on and I was getting 62mph to 65mph and reving too around 6400rpm so ive pert a tempest plus on her 25p and was getting around 66 to 70mph at around 5800rpm but now ive had a bit of work done too the engine ive gone too a 26p prom now so all is well hope that helps mate.


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Old 08-06-2013, 08:54 AM   #4
Cracker jack
 
Country: england
Location: hertfordshire
Occupation: Roofer
Interests: boats jetsking
Boat name: Cracker Jack
Boat make: Extreme 21
Engines: 5.7
Cruising area: hayling island

Join Date: Mar 2009
Location: hertfordshire
Posts: 507
I've just brought the boat and its already got a 23p on it but I didn't think it would be better for top end than a 21p or 20p I had a ring 20 with a 21p on a 225 Suzuki only done 58mph with the engine sitting on the transom
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Old 08-06-2013, 12:28 PM   #5
gmc
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Boat name: voodoo ,enforcer,assagai
Boat make: ring 21c ,frode 25 , class 2 cat assagai 46 pre
Engines: yam 200hp ,4 v8 cats, , 280 efi
Cruising area: saltash/plymouth sound

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put the boat in the water and try it and then you can work out rpm and speed i would go with the 23p for what you need
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Old 08-06-2013, 02:41 PM   #6
Cracker jack
 
Country: england
Location: hertfordshire
Occupation: Roofer
Interests: boats jetsking
Boat name: Cracker Jack
Boat make: Extreme 21
Engines: 5.7
Cruising area: hayling island

Join Date: Mar 2009
Location: hertfordshire
Posts: 507
Cheers
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Old 08-06-2013, 02:43 PM   #7
Cracker jack
 
Country: england
Location: hertfordshire
Occupation: Roofer
Interests: boats jetsking
Boat name: Cracker Jack
Boat make: Extreme 21
Engines: 5.7
Cruising area: hayling island

Join Date: Mar 2009
Location: hertfordshire
Posts: 507
Just waiting for new trailer hitch. Cheers guys
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