Operating at WOT

[Piers]

Here's an interesting article on the Passage Maker website: https://www.passagemaker.com/technical/troubleshooter-wide-open-throttle

 

[rafiki_]

Yep, interesting article Piers, thanks.

 

[ari]

I almost always give mine a few minutes at WOT toward the end of a run out. Normally when I'm about 10 mins from home I'll blip it up to max for a few minutes, check the revs/speed, check the temperature is stable, then back it back to planing cruise speed for a couple of minutes, then drop it off the plane before entering harbour.

I do it for two reasons.

One, to 'blow the cobwebs out', I figure it can only help to give it a WOT blast occasionally.

Two, to check all is okay. I figure that if something is going to break, or just throw up an issue (like temperature rising) there's a reasonable chance it'll happen at max load, in which case I'm at the end of the day and close to home.

Oh, and three I guess, it's quite fun to end the day with a flat out blast.

 

[MapisM]

Yep, interesting article Piers, thanks.

+1.
Funny to read, as the first thing to chech when an engine doesn't reach its rated max rpm, the throttle cable regulation - which doesn't even exist anymore, in modern engines.
Nice to see that at least PM still cares about us luddites...

 

[petem]

Interesting and confirms (not that there was any need for me) that changing props should be a last and not first resort if an engine isn't reaching max RPM.

I guess the 'fuel burnt' would be a better metric for cars as well as boats?

 

[ari]

I guess the 'fuel burnt' would be a better metric for cars as well as boats?

I believe that cars with variable servicing base the intervals around average fuel consumption (so not quite actual fuel used, but based around it). So a car used mostly in town for short journeys or driven hard will have shorter intervals than one used for long gentle runs.

 

[Portofino]

I only WOT mine after it’s annual lift and engine service .
No particular desire to go 38 knots ++ in normal service .

Rest of the year it’s 80 % load and 550 degree EGT ,s which equates to 1800 rpm or sometimes 78 % load 1780 ish .
I have got the instruments to do this so why not ?

Occasionally they see over 2000 rpm , ( WOT is 2200 )
1- Nav issues - I feel we need speed up ,—- he gonna X my wash kinda thing , rather us his wash - big stuff super yachts , ferries etc
2- red mist decends , some wanna be in a POS running parallel adjusts speed to overtake , usually after I’ve crept up from behind and overtaken him - fool
Cos I am running @ 27/30 and he’s 24 or something , they all fade away N of 30 .

I thought that kinda thing only happens on the roads , but it happens @ sea too
Here’s an example — yeh I know childish before anybody says
And it’s not Testosterone cos wife was driving - :encouragement: women drivers

https://imgur.com/gallery/YaUpd

 

[rafiki_]

I believe that cars with variable servicing base the intervals around average fuel consumption (so not quite actual fuel used, but based around it). So a car used mostly in town for short journeys or driven hard will have shorter intervals than one used for long gentle runs.

Correct. There are many sensors on an Eu 6 spec engine, monitoring just about everything. They also use synthetic oil which does not break down like the old mineral oils.

 

[jfm]

Interesting enough, but not great. Basic premise - that you can run at WOT and it is useful in stress testing cooling, etc, is fine.

But, set up a jerry can of fuel in the e/room to direct feed the secondary filter through a hosepipe - is he for real? And the para on high idle was very questionable. No worries!

...some wanna be in a POS running parallel...

Crikey you're a tough judge Porto!!! - standing on your viewing platform and describing someone sailing by in a rather nice Leopard 27m as a wannabe in a POS

 

[jcwads]

I only WOT mine after it’s annual lift and engine service .
No particular desire to go 38 knots ++ in normal service .

Rest of the year it’s 80 % load and 550 degree EGT ,s which equates to 1800 rpm or sometimes 78 % load 1780 ish .
I have got the instruments to do this so why not ?

Occasionally they see over 2000 rpm , ( WOT is 2200 )
1- Nav issues - I feel we need speed up ,—- he gonna X my wash kinda thing , rather us his wash - big stuff super yachts , ferries etc
2- red mist decends , some wanna be in a POS running parallel adjusts speed to overtake , usually after I’ve crept up from behind and overtaken him - fool
Cos I am running @ 27/30 and he’s 24 or something , they all fade away N of 30 .

I thought that kinda thing only happens on the roads , but it happens @ sea too
Here’s an example — yeh I know childish before anybody says
And it’s not Testosterone cos wife was driving - :encouragement: women drivers

https://imgur.com/gallery/YaUpd

What speed are you going at 1800rpm?

 

[Portofino]

What speed are you going at 1800rpm?

28 upward s it depend on how full it is tankage wise and prop hygiene , so,s there’s a + or - of a knot or two .
On a long run say 4 hrs it does actually speed up but the end ,same rpm
Fully laiden it s white strips are at or even submerged .
Lightly loaded the stripes are 4-6 cm above the WL when parked up in the marina .

 

[BruceK]

PMSL. I like your wife's style. And why not? :encouragement:

 

[BruceK]

It's like leaving the channel @ Conwy. The twice a year day trippers in their speed boats and hooligan ways tear up the outer channel and admittedly overtake me up until the point when the open water starts and suddenly 30knts plus and airborne aint so grand and we cruise on past at a sedate 25.

 

[jfm]

...day trippers in their speed boats and hooligan ways tear up ... and admittedly overtake me ... until ... airborne.

You're being a bit harsh on Portofino there Bruce

 

[Portofino]

You're being a bit harsh on Portofino there Bruce

Pot calling the kettle

Seriously, in marina area,s says bay of Cannes , where all your Mag advertisers take promo pics , or crowded places we take it easy as it’s often a bunfight and post lunch time ,the French like a drink and col regs ( if they ever new them ) seem to go out of the window ,
Eg here
View attachment 67484

 

[jrudge]

I am not an angry boater, I really don't care if someone goes past me 20 feet away at 40 knots in the open sea.

I assume that the other boater has no idea of coll regs so just tend to get out of the way.

The ONLY thing that gets on my *its is why oh why people feel the need to speed through a load of anchored boats.

Usually small boat syndrome but sometimes the bigger guys do it as well and i cant think for the life of me why they do it.

 

[BartW]

Pot calling the kettle


View attachment 67484

in the south area in the middle of this picture, I have anchored this summer at least 5 times,
and I can assure you what you see in this pic, is normal daily habit in that place, without any exception

heavy sports boats (many Itama's ;-) ) pass our boat at nearly planing speed, at less then 5m !!! while guests are swimming behind our boat.

Stabilizers had to work hard there !

boats prefer to ancher here, on the south side of Capri for visiting the Island, instead of the north side, close to the harbour, because on the north side its even worse (we tried the north side only ones)

 

[Ian h]

in the south area in the middle of this picture, I have anchored this summer at least 5 times,
and I can assure you what you see in this pic, is normal daily habit in that place, without any exception

heavy sports boats (many Itama's ;-) ) pass our boat at nearly planing speed, at less then 5m !!! while guests are swimming behind our boat.

Stabilizers had to work hard there !

boats prefer to ancher here, on the south side of Capri for visiting the Island, instead of the north side, close to the harbour, because on the north side its even worse (we tried the north side only ones)

And we thought the Solent was bad in the summer.

When conditions allow though we do like to open up the throttles - Southampton Water now restricted to 40 knots unless you radio in and have Risk Assessment . The further away from Cowes the easier it is to have a blast. Remember this year coming back from Studland bay at 38 knots all the way to top of Southampton water, Did not need to touch the throttles once. Great wind in the hair experience ( although not much hair at my age )

 

[benchmark]

I almost always give mine a few minutes at WOT toward the end of a run out. Normally when I'm about 10 mins from home I'll blip it up to max for a few minutes, check the revs/speed, check the temperature is stable, then back it back to planing cruise speed for a couple of minutes, then drop it off the plane before entering harbour.

I do it for two reasons.

One, to 'blow the cobwebs out', I figure it can only help to give it a WOT blast occasionally.

Two, to check all is okay. I figure that if something is going to break, or just throw up an issue (like temperature rising) there's a reasonable chance it'll happen at max load, in which case I'm at the end of the day and close to home.

Oh, and three I guess, it's quite fun to end the day with a flat out blast.

Are you my long lost siamese twin? That's exactly the same thing I do :encouragement:

 

[MapisM]

in the south area in the middle of this picture, I have anchored this summer at least 5 times,
and I can assure you what you see in this pic, is normal daily habit in that place, without any exception

Yup, the Faraglioni area is indeed stunning (way better than between the Lerins, possibly with even more boats all around you... ), but the traffic can be annoying.
I'll rather stick to my usual anchorages...