Boatmad.com


Reply
 
Thread Tools Display Modes
 
Old 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
__________________

bling ring is offline   Reply With Quote
Old 21-01-2016, 03:47 PM   #2
Registered User
 
Hydrostream's Avatar
 
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..
__________________

__________________
www.powermarine.ie

[SIGPIC][/SIGPIC]
Hydrostream is offline   Reply With Quote
Old 21-01-2016, 04:05 PM   #3
Ringle@der
 
gar163y's Avatar
 
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
gar163y is offline   Reply With Quote
Old 22-01-2016, 04:38 PM   #4
Senior Member
 
OCRDA's Avatar
 
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
OCRDA is offline   Reply With Quote
Old 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.
Carrera is offline   Reply With Quote
Old 24-01-2016, 10:37 AM   #6
Registered User
 
Childsy's Avatar
 
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
Send a message via AIM to Childsy
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 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
Childsy is offline   Reply With Quote
Old 24-01-2016, 12:38 PM   #7
Registered User
 
The Force's Avatar
 
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
The Force is offline   Reply With Quote
Old 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 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.
Carrera is offline   Reply With Quote
Old 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.
bling ring is offline   Reply With Quote
Old 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
bling ring is offline   Reply With Quote
Old 26-01-2016, 02:07 PM   #11
Registered User
 
DoubleSix's Avatar
 
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.
__________________

DoubleSix is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Powered by vBadvanced CMPS v3.2.3

All times are GMT +1. The time now is 11:19 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
×