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30-08-2006, 09:38 PM
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#1
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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Props
Need a bit of decent weather now, so I can go test these bad boys!
29" Mirage Plus's, on loan from Roger ramjet.
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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30-08-2006, 11:38 PM
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#2
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The Doc
Join Date: Mar 2004
Posts: 8,291
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what do you presently have?.......... Bravo whats?
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31-08-2006, 07:26 AM
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#3
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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Bravo1 15-1/4x30
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31-08-2006, 07:00 PM
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#4
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Registered User
Country: England
Location: Bournemouth
Boat make: Extreme 21
Engines: 5.7 EFI Mercruiser
Join Date: Apr 2004
Location: Bournemouth
Posts: 160
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The Mirage Plus 21" I put on mine slowed it down by 400revs! Doh! Things faster with the crappy old Vengance prop!
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31-08-2006, 07:08 PM
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#5
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The Doc
Join Date: Mar 2004
Posts: 8,291
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Yeh, but what did it feel like with the differing props?
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31-08-2006, 07:10 PM
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#6
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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Quote:
Originally posted by Biggest Arms
The Mirage Plus 21" I put on mine slowed it down by 400revs! Doh! Things faster with the crappy old Vengance prop!
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Don't really think the RPM's have much relevance.
did it go any slower, speed wise?
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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17-09-2006, 10:32 PM
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#7
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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Well, I tried the Mirage's today. No noticable increase in speed, but the boat seems to run far more level at a given trim, and was more 'pitch stable'. It was also generaly easier to drive at speed.
The downside is, they suffer with much more vibration as they slip/bite across the chop, and if they cavitate, in fact, there's no vibration to speak of with the Bravo1's, so this is rather annoying, as I think I want a set, but the harshness may put me off. Feels like it'd shake the gimbles & steering to bits in no time.
Dashed over to Cowes & had a lovely spot of Lunch in Cowes with Chaos & Ace, before a healthy blast home.
Perfik!
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18-09-2006, 12:27 AM
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#8
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The Doc
Join Date: Mar 2004
Posts: 8,291
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yeh, was great.
Shame I cant hold a camera (or a steering wheel) steady
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18-09-2006, 07:45 AM
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#9
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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show us a pic then!
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18-09-2006, 11:09 AM
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#10
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The Doc
Join Date: Mar 2004
Posts: 8,291
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later on tonight, when I reloaded PS to my 'puter
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18-09-2006, 11:59 AM
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#11
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Senior Member
Country: England
Location: Warsash
Occupation: Boat Designer
Interests: sport
Boat name: Santana
Join Date: Mar 2004
Location: Warsash
Posts: 1,838
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Funny enough the guys with a Technohull 999 (Greek RIBs I design) tried a pair of worked / lab finish Mirage 29's last week. Best they saw was a tad over 68 knots at 6000rpm.
Previously running Bravo props but this ceratinly gave them a few knots.
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18-09-2006, 01:12 PM
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#12
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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best I saw yesterday was 70.5mph in the slack tide running down southampton water, and 69.7mph against the tide coming home two hours later. 70mph on the gafrig.
Sadly, those numbers are not in Knots
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18-09-2006, 02:55 PM
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#13
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Registered User
Location: Scotland
Interests: Hole maker
Boat make: Humber Ocean Offshore
Engines: KAD 300/DPX
Join Date: Mar 2004
Location: Scotland
Posts: 958
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Jon, what speed do you normally achieve?
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18-09-2006, 02:56 PM
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#14
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The Doc
Join Date: Mar 2004
Posts: 8,291
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the same +/-
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18-09-2006, 03:55 PM
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#15
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Registered User
Location: GOLDEN MILE
Boat name: LILY THE PINK AND TERMINATOR 11
Boat make: PHANTOM 21 AND 20
Engines: 2.5 EFI X 2
Join Date: Mar 2004
Location: GOLDEN MILE
Posts: 2,475
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Jon you should try a pair of hydromotive props they give better acceleration and more topend than bravo props, ive got a 29 rh quad 4 you can borrow if you can find a left hand prop.
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18-09-2006, 09:58 PM
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#16
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Registered User
Country: uk
Location: poole
Occupation: retail
Interests: sport and being lazy
Boat make: ring rib
Engines: merc xr2
Cruising area: bournemouth bay
Join Date: Jan 2006
Location: poole
Posts: 1,681
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A couple of these Audi buggers in ye ass end may give an extra knot or two courtesy the top gear site
http://www.topgear.com/content/news/stories/1096/
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i can na give her any more captain
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