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Old 19 June 2004, 04:35   #21
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Quote:
Originally Posted by codprawn
got to be honest I just don't think it looks right! Hide the prop and it looks like some kind of deformed space alien - just too much up top!
I'm afraid I have to agree entirely - sure ain't pretty.
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Old 19 June 2004, 04:45   #22
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Quote:
Originally Posted by Pitkis
There were no final pricing information yet, but some rumours about 25 000 euros for a 250 hp model was heard.
WOW Think I'll buy another boat WITH an engine and all the trimmings instead
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Old 19 June 2004, 06:08   #23
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Thanks for the great info Pitkis!

Coincidently, I have been looking at the "Scream & Fly" TECHNICAL (not General) site over the last week or so for just this type of information about the Verado engines. There is a good thread but you will need to look back a couple of pages or so to find it.

The boys on the site are primarily interested in the development of race engines and their reliability. The seemingly well-informed site administrator thinks that a race version will be available quite soon. There is also a view expressed on the site that 100hp per litre is a good output for a "normal" engine and that today's standard "go-faster" kit could add perhaps another 40%.

On this basis, it looks like a 300hp or even 350hp version could easily be achieved by modifying the "chip" - but then I'm not a techie, so I am taking a simplistic view. BTW - What's the difference between a "turbo" and a "supercharger"? I believe that one is "driven" and the other is self-propelled, but what does this really mean?

There is some concern about the long-term effect of salt-laden air being sucked into the "whizzy" bits and there may also be some sort of initial problem with the lower gear (shades of Bravo drives perhaps?). However, I cannot believe that Mercury would cap its development budget at $100m and not spend a few dollars more on finding a solution.

I for one am 90% of the way towards choosing a Verado for Aries III, which will hopefully emerge in 2005 but may have to wait until 2006, when I hope to have a launch vehicle. (What else would you use with a "rocket"?).

Still, if it has to be 2006 - who knows - we could have a 350hp verado to play with by then!

Happy Boating!

Chris.
AKA "Minty" on non-RIB sites
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Old 19 June 2004, 07:07   #24
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Main difference between supercharging and turbos is that the turbo is driven by exhaust gases whilst the super is driven mechanically by the engine.

There are more losses with a supercharger but the main advantage is that it is always boosting - no lag waiting for it to spin up. This means loads of torque low down with no delay - just what you need on a boat to get it onto the plane quickly.

As to sucking in salt laden air this is just as much a problem with any engine although the supercharger will have to be consstructed from suitable materials.

Everyone mentions how quiet the engine is - what about that typical supercharger whine?

Personally I much prefer a supercharger - just look at how well they worked on RR Merlins during the war!
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Old 20 June 2004, 05:58   #25
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Thanks for explaining this, Codprawn.

I'm afraid I don't remember the RR Merlin engines during the War - I wasn't around at the time! It's amazing to think that the same underlying technology has taken 60 years to be applied to outboard engines though.

Following your explanation, it makes a lot of sense that Mercury went down the Supercharger route when striving to develop a 4-stroke that can match (or better) the performance of today's two-strokes.

Regards,

Chris.
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Old 20 June 2004, 09:18   #26
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Quote:
Originally Posted by Chris Murray
Thanks for explaining this, Codprawn.

I'm afraid I don't remember the RR Merlin engines during the War - I wasn't around at the time! It's amazing to think that the same underlying technology has taken 60 years to be applied to outboard engines though.

Following your explanation, it makes a lot of sense that Mercury went down the Supercharger route when striving to develop a 4-stroke that can match (or better) the performance of today's two-strokes.

Regards,

Chris.
I wasn't around either - cheeky sod!!!!

When it comes to cars/boats etc there is so very little that is actually new - propbably the most advanced thing on anyones car are the tyres - something most people hardly bother with!

Aero engines in the 20s were running 2 sparkplugs per cylinder - variable valve timing - superchargers - sodium cooled exhaust valves etc etc.

The Caterham 7 - the worlds best handling car - uses a de dion rear axle setup - as do Aston Martin - a design developed in 1893!!!

Same with guns - theColt .45 automatic pistol was developed in 1911 - they haven't changed much since.

The 3 biggest advances are materials engineering, medcine and electronics - apart from that someone HAS done it all before!
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