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  1. #1
    Join Date
    Nov 2018
    Posts
    2

    Default Prestige 500 fly IPS 600 at Displacement speed

    I have purchased a 2015 Prestige 500 fly. The boat is currently in France and I will be flying over in late August to deliver the boat to her new marina in the Trieste area in Italy in the Northern Adriatic. The trip is about 1400nm. I have a few questions which will help me plan for this trip.

    I understand the balance between speed and fuel consumption. I also know that it is not good to cruise a diesel engine at low revs for an extended period of time. Can anyone advise how long one can run at 8 to 9 knots and how long one should run it faster on a plane (>3000rpm) to clear motor out after running at displacement speed.

    Does anyone have real life cruising fuel consumption for the Prestige 500.

    My sailing catamaran I often run with one engine. At displacement speeds is this an option with IPS drives?

    What are the operating hours of the fuel stations in the marina's in France, Italy and Croatia?

    What are the best weather apps to use in that area. We will be going up to Hyeres area, across to Corsica, Elba Islands, down the Italian coast, through the straights of Messina, across the boot of Italy, up the Italian coast and then across to Croatia. Up the Croatia coast to Trieste.

  2. #2
    Join Date
    Apr 2007
    Location
    midlands
    Posts
    7,132

    Default Re: Prestige 500 fly IPS 600 at Displacement speed

    [QUOTE=paulrackstraw;6765269]I have purchased a 2015 Prestige 500 fly. The boat is currently in France and I will be flying over in late August to deliver the boat to her new marina in the Trieste area in Italy in the Northern Adriatic. The trip is about 1400nm. I have a few questions which will help me plan for this trip.

    I understand the balance between speed and fuel consumption. I also know that it is not good to cruise a diesel engine at low revs for an extended period of time. Can anyone advise how long one can run at 8 to 9 knots and how long one should run it faster on a plane (>3000rpm) to clear motor out after running at displacement speed.

    Does anyone have real life cruising fuel consumption for the Prestige 500.

    You have a very modern engine therefore there is no problem running it a slow rpm , you may have the option of real live fuel data from the engines displayed on the plotter or EVC small screen data , if itís a new boat get the dealer to upgrade the software to give this option, that way you can put the boat through the speed and rev range to give MPG .
    My persona view is to run both engines as the steering will be vague and there would be doubts the autopilot would work correctly on one engine.

  3. #3
    Join Date
    Oct 2007
    Location
    Belgium
    Posts
    4,764

    Default Re: Prestige 500 fly IPS 600 at Displacement speed

    good advice from VP regarding fuel consumption
    I have no experienjce with your boat / engine models
    I would alway's run with both engines, on some boats its not favourable to run on one engine for different reasons...

    nice and interesting trip !
    I have done most of it, but not in one season

    can't answer your Q about operation hours of fuel stations,
    but I would advice to plan the trip so that you can go for fuel in normal "marine office hours"
    and call or mail the fuel station in advance, and make a appointment for getting fuel, or discuss the possibility's

    It makes sense to plan for buying tax free fuel in Porto Montenegro (50% cheaper) but you need to make a appointment a few day's in advance there !

    some tracks on this route are very nice ! make sure you can experience some of that !

    for wheather prediction I alway's use Windfinder Pro (superforecast)
    as a second source I use LammA Meteo (Italy / ligurian sea)
    I use another in Croatia, but forgot the name, tbc

  4. #4
    Join Date
    Mar 2002
    Posts
    16,948

    Default Re: Prestige 500 fly IPS 600 at Displacement speed

    Quote Originally Posted by paulrackstraw View Post
    What are the best weather apps to use in that area. We will be going up to Hyeres area, across to Corsica, Elba Islands, down the Italian coast, through the straights of Messina, across the boot of Italy, up the Italian coast and then across to Croatia. Up the Croatia coast to Trieste.
    Sounds like a plan! All the best, and don't forget that we love cruise reports, here in the asylum - apropos, welcome to it.

    Sea-conditions and Windy and VentuSky are among my preferred apps/websites, but there are also others, and nowadays I think that most actually rely on the same source, so once you will find your preferred one, it's not much worth bothering to cross-check with others.

    Not much to add to what volvopaul posted ref. the usage of your setup, aside from suggesting you to take what he said as carved in stone.
    You might not know since you are new around here, but he's our resident bible on anything VP-related!

  5. #5
    Join Date
    Mar 2002
    Posts
    16,948

    Default Re: Prestige 500 fly IPS 600 at Displacement speed

    Quote Originally Posted by BartW View Post
    as a second source I use LammA Meteo (Italy / ligurian sea)
    I use another in Croatia, but forgot the name, tbc
    Good point ref. LaMMA, I forgot to mention it but that's another one which I also find reliable.
    For HR, is possibly this one that you have in mind?

  6. #6
    Join Date
    Feb 2010
    Location
    Mallorca(boat), Hampshire(home)
    Posts
    224

    Default Re: Prestige 500 fly IPS 600 at Displacement speed

    Quote Originally Posted by volvopaul View Post
    You have a very modern engine therefore there is no problem running it a slow rpm.
    At the risk of venturing off topic, I was very interested to read this because I'm still very unclear as to whether regular slow running DOES or DOES NOT cause bores to glaze and all manner of other engine issues?! My boat has fin stabilisers which allow it to run beautifully and pretty endlessly at 10 knots / 1000 rpm. But I've in the past been told that to run for hours on end at this speed will be bad for my Caterpillar C18 1150hp engines. So I try to do 20 minutes at 1800rpm every two hours. But it's often a bit of a bore to stick to this routine of speeding up so often...

  7. #7
    Join Date
    Apr 2011
    Location
    Boat- SoF
    Posts
    4,740

    Default Re: Prestige 500 fly IPS 600 at Displacement speed

    Quote Originally Posted by MedMilo View Post
    At the risk of venturing off topic, I was very interested to read this because I'm still very unclear as to whether regular slow running DOES or DOES NOT cause bores to glaze and all manner of other engine issues?! My boat has fin stabilisers which allow it to run beautifully and pretty endlessly at 10 knots / 1000 rpm. But I've in the past been told that to run for hours on end at this speed will be bad for my Caterpillar C18 1150hp engines. So I try to do 20 minutes at 1800rpm every two hours. But it's often a bit of a bore to stick to this routine of speeding up so often...
    Two aspects need splitting out and treating separately.
    Over fuelling with analogue delivered fuel because the things works on a mech cam and plunger optimised for the correct range of operation .
    Lower than this and a slight or moderate excess fuel goes slightly unburnt and gum forms that sticks to the honing and hence the glazing .
    Modern CR pulse delivered fuel eliminates this as just the correct amount is delivered across the whole range inc 1000 rpm or what ever .Hence VP - both the forumite and factory are correct .

    How ever the Second tier of thought is agglomeration , the formation and mitigating factors decreasing this .
    Theses no getting round low Exhaust Gas Temps at 1000 rpm and excess properly burnt contents even with CR ( the right fuel dose ) .This partial burnt ( cos itís not high enough temp basically) stuff is the real wear stuff short of adding pumice to your oil - only joking folks

    What sort of bores do you have ?
    What sort of rings ?
    Whatís your oil like ?
    Whatís your oil change Fq ?

    They say minimum agglomeration occurs at around 550 / 630 EGT .
    For reference for me thatís N of 1750 rpm .
    1000 rpm and it plummets to 2-300 IRCís deemed too low .

    Then mix in how long are you gonna keep it 1000 hrs ,3000 hrs 10,000 hrs .
    If running at 1000 rpm predominantly 1/2 s the engine life from say 20000 to 10000 hrs so what ?
    How ever if issues start to creep in at say an easily a achievable say 1500 hrs due to not so resilient liner material or not so resistant theses days rings ........ Longish oil Fq change intervals etc etc.

    Just make an informed choice.

    Back to the OP
    Let the wind and waves dictate the pace .
    There will be days of port bound , lost days due to wind and days of pancake calm in which case gun it leapfrog halts .

    Itís such a long trip you canít pre plan it really and keep to that .
    Last edited by Portofino; 19-04-19 at 14:55.

  8. #8
    Join Date
    Mar 2002
    Posts
    16,948

    Default Re: Prestige 500 fly IPS 600 at Displacement speed

    Quote Originally Posted by MedMilo View Post
    I'm still very unclear as to whether regular slow running DOES or DOES NOT cause bores to glaze and all manner of other engine issues?!
    My understanding, based on several talks on this matter with all sort of official engineers (Cat, VP, MAN, MTU), some with more white hairs than myself (and all speaking based on experience rather than web searches ), is that the answer to your question is yes it does, in principle.
    Also with modern electronic engines, albeit to a somewhat lesser extent.

    BUT the key point is, how long does it take for this process to be meaningful?
    And in spite of the fact that this is to some extent a debate about how long a piece of string is, all of these folks, bar none, agree that this concern is totally pointless in pleasure boats.
    I mean, yes, if you install an E (light duty) rated engine like yours in a similar size fishing trawler that runs 24/7 at 8 knots, with the prop demanding 100hp (if that) at 800rpm, you are likely to have the problems you mention, sooner or later.
    Same goes for a Nordhavn, which can spends weeks crossing oceans, with nowhere to stop in between.
    Which is exactly the reason why you won't find your engines in any of these boats.
    Though coming to think of it, Nordhavn did fit a couple of C18 in one of their boats, but that's the massive 96, and with the continuous duty version of them, rated for 450 or so (yes, much less than half!) hp at 1800 rather than 2300rpm.

    So, here's my personal conclusion, fwiw: at 10kts, the longest passage you can make, anywhere in the Med, takes less than 24 hours.
    If you fancy doing it 100% at D speed, just do it, and maybe give the engines a spin for 20 mins or so just before arriving.
    But don't lose your sleep if you would even forget this last bit of "Italian tuning". Your engines weren't built in Modena!

    Personally, what I find more difficult now that I'm back to fastish boating, is just to resist the temptation to at least bring the boat up on the plane, even if at just 18kts or so.
    But that's also because my particular boat really comes into her own only at P speed (even better if in the upper half of 20s), and ain't stabilized.

  9. #9
    Join Date
    Apr 2011
    Location
    Falmouth
    Posts
    1,841

    Default Re: Prestige 500 fly IPS 600 at Displacement speed

    I had a prestige 500 (s) for three years.
    We sailed it from Falmouth to the Algarve - 1700 miles and mainly we stayed just below displacement speed, around 7.5kts. Rpm just less than 1000 and Consumption at this speed was around 15l per hour.
    Best cruise for the boat at planing speed is around 20knots @ just under 3000 rpm - youíll be around 110l per hour.
    Max speed will be 28 knots or thereabouts - thatís gong to cost around 160lph.

    Range when planing is around 220 nm- when plodding along more like 800 nm.

    Fuel burn/gauges on my boat were very accurate.

    In reality - if you get sea from behind or ahead youíre fine to stay at low speed, thereís no point going up to displacement speed, around 8 knots, as your consumption will rise and so will the bow!

    Anything from the side and youíll want to get the boat up and over before you start losing wine glasses and lunch.

    We never ran with one engine as someone suggested to me that it might cause wear on the pod transmission - not sure if thatís true......

  10. #10
    Join Date
    May 2001
    Location
    Broken Brexit Britain
    Posts
    52,272

    Default Re: Prestige 500 fly IPS 600 at Displacement speed

    Possibly the manual for your boat may have instructions for running on one engine only. In the manual for my boat, it states that if one engine is not running and the prop is left to freewheel, it is critical to keep an eye on gearbox oil temp and if it exceeds 80degC, engage gear to stop the prop freewheeling even though this will cause more drag

    I do a lot of cruising in my 63ft planing boat at displacement speed but generally I cruise at planing speed for about 20mins in every hour on average. This is not because it says so in any manual but simply because I believe it is beneficial for the engines to be put under load on a regular basis

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