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Old 20-01-2016, 10:43 PM   #1
Cracker jack
 
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Prop choice

I've just brought a ring 21c with 225 vmax it currently has a 21p on it I don't race and I don't need bottom end so what would be best for mid and top end. Cheers
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Old 21-01-2016, 04:47 PM   #2
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Ran mine with a 25 laser 2 or balistic..
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Old 21-01-2016, 05:05 PM   #3
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Boat name: Both called ‘Irresistible’.
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Chopper, Tempest Plus or possibly a Fury.
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Old 22-01-2016, 05:38 PM   #4
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I think you will find it runs quite well with whats on it !!
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Old 22-01-2016, 09:59 PM   #5
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Prop choise depends quite a bit on engine height.

Don't know if a Ring differs a lot from a Phantom but thought I'd share my experience with P21's.

I had a P21 with a 225 Yammy and a 23" standard Yammy Steel. Worked fine prop way below pad and did just over 70mph. Engine setup 2Ĺ" to the right it ran dead straight at top speed. No fun what so ever

Another one I had was an extremely heavy Cobra P21 with a 225 Merc. That one was originally setup with a 23" Tempest Plus, prop axel about 2" below pad. Had big trouble getting it on plane and it ran top end at 68mph. I then set it up with a surface piercing 26" 4-blade Hydromotive, prop axel at pad. Got top end up to 75mph.
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Old 24-01-2016, 11:37 AM   #6
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Tech Talk

Quote:
Originally Posted by Carrera View Post
Prop choise depends quite a bit on engine height.

Don't know if a Ring differs a lot from a Phantom but thought I'd share my experience with P21's.

I had a P21 with a 225 Yammy and a 23" standard Yammy Steel. Worked fine prop way below pad and did just over 70mph. Engine setup 2Ĺ" to the right it ran dead straight at top speed. No fun what so ever

Another one I had was an extremely heavy Cobra P21 with a 225 Merc. That one was originally setup with a 23" Tempest Plus, prop axel about 2" below pad. Had big trouble getting it on plane and it ran top end at 68mph. I then set it up with a surface piercing 26" 4-blade Hydromotive, prop axel at pad. Got top end up to 75mph.
Interesting information & thanks for sharing, when you refer to "pad" are you meaning the bottom most part of the transom (the 'v')..?
Thanks
Mark
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Old 24-01-2016, 01:38 PM   #7
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21 seems a bit short for a 225 Vmax on a ring 21 - I would have thought at least 23 1/2 if not nearer 25 - obviously depending on boat setup etc
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Old 24-01-2016, 08:19 PM   #8
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Country: Finland
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Boat make: Hydrostep 650, TG 5000XR, Kimach 450 Speed, Stopper
Engines: Merc 115 ProXS 4S, Merc 60 Formula Race, Yamaha 20
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Quote:
Originally Posted by Childsy View Post
Interesting information & thanks for sharing, when you refer to "pad" are you meaning the bottom most part of the transom (the 'v')..?
Thanks
Mark
Yep, pad is bottom level.
If you decide to go for it and lift the engine higher just make sure you arrange low water pick up.
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Old 25-01-2016, 07:00 PM   #9
Cracker jack
 
Country: england
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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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It's on a Gill bracket with rear fuel tank and trim tabs.
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Old 25-01-2016, 07:02 PM   #10
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
My brother has the same boat with a 200 yam prov running a 23p with bow fuel tank runs spot on it see 71mph once
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Old 26-01-2016, 03:07 PM   #11
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Country: In the UK, in an offfice, looking out the window at the rain.
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Boat name: DoubleSix
Boat make: Ring 21c
Engines: Opti 200
Cruising area: Lyme Bay

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23 pitch laser II on 21C with a 200HP optimax. Fitted trim tabs and ditched the aft 190 litre alloy fuel tank in favour of a smaller plastic one and mounted it a few inches further forward. I have a bo ballast tank but never use it.

All this helped keep it more stable and increased the availability of full throttle when trimmed out.... without soiling my underpants! Top end increased by 1 or 2 MPH - now nearer 70MPH.
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