Why are some stinkpots much louder than others?

[fredrussell]

I mean no disrespect to mobo owners, but why are some of them so loud compared to others? On the Orwell yesterday there was one that you could hear, easily, two miles away. It’s hard to believe their owners actually want it that way. I can’t understand how one boat with several hundred hp can make a fraction of the noise of another similarly powered one. Is it just different exhaust systems?

 

[oldgit]

Virtually all stinkpots pre 1980s would have a straight throught exhaust,nobody cared and it made your 100hp sound like at least like 1000HP
This is great on start up but becomes very very wearing after 5 mins and annoying to anybody else on the water within 5 miles.
As time went on, owners of Ginplaces demanded that they could hear their "Soft Cell" cassette tapes from the flybridge speakers and exhaust noise was drowning out this dross.
So silencers were fitted. QED.
The only downside is that you can no longer hear a boat coming from miles away and be able get ready to brace yourself as he passes unnecessarily close at speed..

 

[ChromeDome]

Oh, ah - just thought the thread was about motorbikes..

To some "sound design" is all.

Over there you can even get it switchable - open or below surface

 

[LittleSister]

I mean no disrespect to mobo owners . . .

Traitor!

 

[Neeves]

Traitor!

Many yachts are effectively used as MoBos.



Jonathan

 

[LittleSister]

Many yachts are effectively used as MoBos.



Jonathan

Shush!

 

[PCUK]

Funnily the most noisy boat I ever had to put up with was a sail boat in Watchet Marine. It had presumably a small two pot diesel and the uncaring pig of an owner would start it at four in the morning (or whenever) and warm it for half an hour before departing.

 

[ChromeDome]

Yachts motoring at waterline-ish speed by a small engine bordering the red (area on the tacho) with everything onboard shaking and vibrating is not a pleasant company either.

 

[V1701]

In motorbike land aftermarket (lighter in weight and ususally significantly louder, with a removable baffle to make it louder still) exhausts are a big market for sure. There's some merit in "cagers" (car drivers) being able to hear you coming, especially now some drivers are looking at their mobile phone half the time. I've never fitted one myself and also wear earplugs, it's surprising how less tiring it is on longer trips just because it's quieter...

 

[footsoldier]

I mean no disrespect to mobo owners, but why are some of them so loud compared to others?

It is an unfortunate fact of life that the chav element of society has always been attracted to the internal combustion engine and its tiny mind delights in using it in an anti-social way. That goes for motorcars, motorbikes and, sadly, motorboats too. The noisier the machine, the more inadequate the driver.

 

[PCUK]

It is an unfortunate fact of life that the chav element of society has always been attracted to the internal combustion engine and its tiny mind delights in using it in an anti-social way. That goes for motorcars, motorbikes and, sadly, motorboats too. The noisier the machine, the more inadequate the driver.

. . . and sailing boats as per my previous!

 

[Alan S]

As the owner of a solar powered mobo I dislike all diesel boats. Noisy, smelly, dirty. That's the boats, not the owners although sometimes I'm not sure about them either.
Please note the above is a bit tounge in cheek, I'm sure most of you are really nice guys!

 

[reallycoliholic]

Worst one I ever sea trialled was Fairline Turbo 36. Put me right off buying it. Unnecesarrily loud. Owner told me they're all like that and there's nothing to be done, so gave up with the planned purchase

 

[PabloPicasso]

Many yachts are effectively used as MoBos.



Jonathan

Many yachts are effectively used as;
# caravans
# moneypits
# floating sheds


Occasionally somebody could actually sail one, but this may be considered heresy

 

[Neeves]

In our summer we sit at our evening meal, which I call dinner, and watch the fleet of yachts following each other as they motor to a sheltered bay, 2 bays that 'interconnect', for the weekend. The bay is full of private moorings and convention allows anyone to use the moorings - as long as the owner does not turn up. There are literally hundreds of buoys.

On Sunday late afternoon we watch these same yachts motoring back.

They don't use sails as they are working to a schedule and sailing is really not a pursuit that works so well if you need to be somewhere at a precise time.

I have often thought these yachts would be a good buy when they are sold on. Unused sails and minimal use of the deck gear.

I don't knock it. These people support the local chandler ensuring that when we need something they have it in stock and the chandlers are open 7 days a week. They keep the fuel in the fuel wharfs 'fresh' (though we buy from roadside service centres, its considerably cheaper). etc etc. They also work 9-5 weekdays and this allows us empty seas from Monday to Friday.

But I do like the idea of them being floating sheds.

Jonathan

 

[Sandy]

Why are some stinkpots much louder than others?

The vanity of the owner. A bit like car owners. There is nothing stopping the owner making the engine/exhaust as quiet as practicable.

 

[ashtead]

Is it that silencers don’t yet exist for commercial day angler fishing boats ? Always found at x am as they depart with the local anglers club out for a day rolling in the channel they have Concorde like takeoff habits .

 

[oldgit]

My Damascene conversion came after a ferry trip on a beautiful little Hardy 27 .
Whisper quiet with only a quiet barely audible burble from both the engines, even when getting a move on ..... well lets call it 9/10 knots.
On my own fine vessel at the time was a pair of M135 Sabres directly venting to the outside world ,the cacophony on the fly with the throttles open was impressive but wearying. Resolved to fit a couple of budget waterlocks and after advice from Latestarter (previously of these forums ) managed to install a pair, basically because there was enough room to fit the things .
Not perfect but you could now actually hear the wash around the stern.
Shortly afterwards having finally sorted out all the imperfections and problems that needed to be rectified on this boat, decided that we needed a "better" boat and it was put up for sale

Next purchase was obviously better, newer, faster, more spacious and with much improved seakeeping.
....and the roar from pair of unsilenced diesels was back in all its glory. and absolutely no room to fit any remedy for the noise.

Current boat has a very very efficent noise reduction system indeed.

​

 

[Bouba]

Why are so many yotties in the Electric Vehicle thread hating them because they enjoy the noise their road machines make?

 

[Bouba]

Even I don’t like to be disturbed by a noisy engine....but try spending a windy night or week in harbour with the infernal rattling of hundreds of yachts 24 hours a day