|
20-01-2016, 09:43 PM
|
#1
|
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: 528
|
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
__________________
|
|
|
21-01-2016, 03:47 PM
|
#2
|
Registered User
Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin
Join Date: May 2004
Location: Dublin
Posts: 1,803
|
Ran mine with a 25 laser 2 or balistic..
__________________
|
|
|
21-01-2016, 04:05 PM
|
#3
|
Ringle@der
Country: England
Location: Uckfield, East Sussex.
Interests: Water Ski Racing.
Boat name: Both called ‘Irresistible’.
Boat make: Bernico F1 Twin, Monterey 265SC.
Engines: 2 x Mercury 300XS's, Yanmar 315.
Cruising area: South and east coasts. Eastbourne Marina.
Join Date: Mar 2006
Location: Uckfield, East Sussex.
Posts: 758
|
Chopper, Tempest Plus or possibly a Fury.
__________________
Irresistible Water Ski Racing Team
|
|
|
22-01-2016, 04:38 PM
|
#4
|
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
|
I think you will find it runs quite well with whats on it !!
__________________
If Only
National Outboard Immersed Propeller Mono Record 103mph
|
|
|
22-01-2016, 08:59 PM
|
#5
|
Registered User
Country: Finland
Location: Helsinki
Interests: Everything fast
Boat make: Hydrostep 650, TG 5000XR, Kimach 450 Speed, Stopper
Engines: Merc 115 ProXS 4S, Merc 60 Formula Race, Yamaha 20
Cruising area: Helsinki
Join Date: Apr 2014
Location: Helsinki
Posts: 67
|
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 2½" 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.
|
|
|
24-01-2016, 10:37 AM
|
#6
|
Registered User
Country: Uk, sometimes Dubai
Location: Newmarket, Suffolk
Occupation: Racehorse Exercise Rider
Interests: Powerboating, Squash, Running, Horseracing
Boat name: FAT BOY
Boat make: Cougar 27'
Engines: EVINRUDE G2 300
Cruising area: Orwell, Harwich, East Coast
Join Date: Sep 2012
Location: Newmarket, Suffolk
Posts: 243
|
Tech Talk
Quote:
Originally Posted by Carrera
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 2½" 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
|
|
|
24-01-2016, 12:38 PM
|
#7
|
Registered User
Country: UK
Location: North Hampshire
Occupation: Sales
Interests: Powerboat Racing
Boat name: Team Purple, Team Shark
Boat make: Sperstock 150, 300 race boats, Class 3s cat
Engines: Honda 150, 2.5 efi ROS*2
Cruising area: Solent
Join Date: Feb 2007
Location: North Hampshire
Posts: 125
|
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
|
|
|
24-01-2016, 07:19 PM
|
#8
|
Registered User
Country: Finland
Location: Helsinki
Interests: Everything fast
Boat make: Hydrostep 650, TG 5000XR, Kimach 450 Speed, Stopper
Engines: Merc 115 ProXS 4S, Merc 60 Formula Race, Yamaha 20
Cruising area: Helsinki
Join Date: Apr 2014
Location: Helsinki
Posts: 67
|
Quote:
Originally Posted by Childsy
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.
|
|
|
25-01-2016, 06:00 PM
|
#9
|
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: 528
|
It's on a Gill bracket with rear fuel tank and trim tabs.
|
|
|
25-01-2016, 06:02 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: 528
|
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
|
|
|
26-01-2016, 02:07 PM
|
#11
|
Registered User
Country: In the UK, in my office, working, waiting to go boating.
Occupation: Chartered Engineer
Interests: boats, water, snow, football
Boat name: “DoubleSix”; “Blue Lias”
Boat make: Ring 21c; Pacemaker 21
Engines: Opti 200; twin Volvo AQ110s
Cruising area: Lyme Bay
Join Date: Aug 2012
Posts: 138
|
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.
__________________
|
|
|
|
Thread Tools |
|
Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
» Recent Threads |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|