A New Chapter - a new Marlow

[Gludy]

We actually like travelling slow and taking it steady. We see more and enjoy it more.

Most long range boats are displacment boats that have no option but to do less than 10 knots. Wit c18's I can do 24 knots, cruise at 20 knots or doodle along at 8 or 9 knots.

I also use the current/tide and plan lots of journeys so we are with it - other jorneys as night passages to arraive at first light etc.

When I have to make it for a lock or something I turn on the power. When i do a short weekend trip - I often do so at speed but for much of my intended crusing i would be happy at 8 or 9 knots yet want the option to speed up to suit the circumstances.

I will speak to Cat.

The third engine will have a separate fuel tank and be independent so as to offer additional security.

I am learning a lot from the biews being expressed so keep them coming.

 

[Gludy]

I once went from Cherbourg to Guernsey and timed the journey through that rough bit of water so as to hit it at a reasonable time but when in the Alderney race found it calm but the boat was simply going too fast. Went down to one engine at tickover and still too fast - in fact to get the righjt speed it would have been easier to head away for our destination and go stern first!! There was one hell of a current taking us and so I only needed some speed for steerage.


I did not want to wait around outside the marina and knew that I needed a fait depth to get into the marina. Nor did i want to leave later and face rougher water through the Alderney race.

I think I will order the trolling feature but now understand its just the slow speed agaility that will be useful.

 

[Gludy]

Andy
A third A rated engine is not a bad idea. You idea makes sense.
A sahft drive third engine of say 360 hp A rated as the distance engine.

How may lesiure boats have A rated engines?

 

[Ifraser]

Re: A New Chapter - a new Marlow

Just a thought... and not sure if already mentioned as I haven't read all the posts have you considered a water jet unit for that third engine... that would cause little or no drag at high speed. Just an out of the box 3.30 am thought!! cheers Iain

 

[andyball]

>>How may lesiure boats have A rated engines?

very few, what are Nordhavn's? on older things like my non-turbo ford, you can just derate to 1500rpm ( from 2400 ) & presto - continuous duty.

360 hp now? !! what happened to 9 knots @ 120hp? a 360 a-rated engine is quite a hefty thing.


is is any color engine you want at Marlow, so long as it's white? or just that the Cat's look the best deal for you?

 

[Gludy]

There is a choice of engines for the main and I think the pod. Certainly some have luggers. some Man but most have Cats.

I stated the larger size for the A rated pod because if it was A rated it would need to be - they seem less powerful?

A jet unit is thinking out of the box, never even occured to me - I will investigate. Mind you I doubt if they will do such a radical departure from standard without all sorts of warranty issues rtc. It is still worth investigating because David Marlow likes thinking out of the box.

 

[gandy]

Can you run on one main engine for long endurance work?

 

[Gludy]

One main engine can be run for the long endurance work - there is the penalty of the other free prop but one engine running is common practice with delivery skippers. I think it may actually use more fuel; tham twin enghine running because the prop is off centre and having to provide the energy to turn the free prop, so the only upside is that the engine is running at a higher load.

 

[MapisM]

[ QUOTE ]
I stated the larger size for the A rated pod because if it was A rated it would need to be - they seem less powerful?

[/ QUOTE ]
Careful, the logic is actually the other way round.
If for a given application requiring 120hp you're considering an E rated 240hp engine, then a 140hp A rated engine will do.
In fact, probably the block of the 140hp might well be the same - or even bigger - than the 240hp E rated.

 

[Gludy]

What I meant was that the A rated engine would be sau the size of a larger engine - in effect would this not simply be ruinning the A rated engine at only part of its possible load thus taking us back to where we were to begin with?
A C18 may be A rated for say 600HP isntead of its 1015 hp - ok the gearing is different but surely the engines and parts are the same?????

 

[MedDreamer]

Good luck Paul, I hope this time you really do get the boat you want.

I look forward to the maiden Round Britain cruise when we can all come on board and ruin your carpets..........errr I mean admire the boat /forums/images/graemlins/smile.gif

 

[jhr]

Best wishes, Paul. I hope we hear much more about your new boat in the months to come - but for all the right reasons this time! /forums/images/graemlins/smile.gif

 

[Gludy]

I am developing some hover slippers that hover you a few mms above the floor when you look around the boat. Its not listed as an option yet but then neither is the third engine being a jet, so I should be able to wangle it.

It looks as if the round Britian trip will be one the first things we will do with her - we will take our time doing it - we have the best coastline anywhere ..... if only the weather .....

I think there will be a 53C Marlow at the Southampton Boat Show next month so that may be worth taking a nosey at.

 

[andyball]

[ QUOTE ]
I think there will be a 53C Marlow at the Southampton Boat Show next month so that may be worth taking a nosey at.

[/ QUOTE ]

Dare I ask for a look around? - not blacklisted by Marlow too I hope.

 

[ccscott49]

I'd go with variable pitch props on both mains and no centre engine. Then you can run on one engine and feather the other prop. Centre motor is just more systems, more things to go wrong. Maybe a chat with Caterpillar themselves would give you a lot more information.
But what ever you do, the very best of luck with her, the build stages are probaly one of the most enjoyable times.

 

[Gludy]

Andy - I was going to ask you to take a look for me and take your notepad with you! I will arrane it all for you. /forums/images/graemlins/cool.gif

 

[Gludy]

If I went for variable pitch props are they not less efficient when being used at the higher cruising speed? I am investigating this idea now - thank you for it.

 

[MedDreamer]

Colin, why the name change?

 

[andyball]

well if you thought 5-bladers were expensive - shudder at quality variable-pitch ones. /forums/images/graemlins/shocked.gif

my considered technical opinion - ( ie I just made it up ) is that yep, you'd lose a bit of efficiency/drive, but make up for it at other speeds. But umm, unless auto-variable ones, is another lever to use of course.

I looked at a boat with one in Holland - no forward/reverse in gbox, just change the prop around, and superb for slow speed stuff of course, since can feather to little or no drive at all. ( not that no-drive is useful, except if there's no umm neutral )

No 1 Moose today reckons a decent gas-turbine & jets is the answer to Toscana's weighty engines - and would likely suggest you took the same route /forums/images/graemlins/blush.gif It would sound impressive, yes?

 

[Gludy]

No chance of jets as main engines on a marlow - they do not like them at all.