Pipes - Loud or loser?

[NighthawkNZ:Me]

So do you believe that a pedestrian could hear a bike with a quiet set of pipes coming as easy as they could hear a set of Akro's on a Duc?

Not when most are listening to their MP3 Players at high volume, I see a lot of that on my way to work every morning... or they are to busy walking and texting to even bother to looklet alone listen ...

a young kid aint gonna give a shit either if he wants to chase that ball...

Personally no they don't all it does is gives a few bikers a hardon, and annoyes others... escially the gits that run straigh pipes... personally they just sound like noise...

Get a purring sound of a V-Twin and or Inline four with some nice pipes and the tone of them are totally different, noise verses tone.

As most people have saidd you are not goint to here a bike loud pipes or not behind or on coming till you pass it. Especially when you have the air con on, radio blearing and yelling at the kids to shut the F**k up...

Whoever could be bothered clearing cookies to do it.

Firefox does that automatically every time I close the browser down...

[Oscar]

Could one of you genuises explain to me how sound travelling in the opposite direction from a moving motorcycle can somehow alert the driver of a car in front of that same motorcycle?

Surely that would require a constantly moving object placed immediatley behind the motorcycle to reflect the sounds waves forward?

Alternatively, forward facing mufflers?

[mashman]

Could one of you genuises explain to me how sound travelling in the opposite direction from a moving motorcycle can somehow alert the driver of a car in front of that same motorcycle?

Surely that would require a constantly moving object placed immediatley behind the motorcycle to reflect the sounds waves forward?

Alternatively, forward facing mufflers?

Why does an airplane so so so far in the sky make so much noise? I mean, it's 20,000 feet up?

[Bald Eagle]

Why does an airplane so so so far in the sky make so much noise? I mean, it's 20,000 feet up?

Gravity pulls the sound down

[steve_t]

Why does an airplane so so so far in the sky make so much noise? I mean, it's 20,000 feet up?

The sound of A380 engines exploding travels in all directions

[mashman]

Gravity pulls the sound down

So why can I hear cars from the state highway on the roof of a building 200 metres away and 11 floors up?

[Bald Eagle]

The sound of A380 engines exploding travels in all directions

So why can I hear cars from the state highway on the roof of a building 200 metres away and 11 floors up?

Actually all sound travels in all directions.

[mashman]

Actually all sound travels in all directions.

Whew

[Oscar]

Actually all sound travels in all directions.

Sound hardly ever travels in all directions equally.

When you speak the sound is projected mainly forward and the waves travelling backward from your lyrnx are absorbed by the tissue in your throat, neck and head.

Sound coming from a conical muffler travels in one direction until it hits something that reflects it.

[steve_t]

Sound hardly ever travels in all directions equally.

When you speak the sound is projected mainly forward and the waves travelling backward from your lyrnx are absorbed by the tissue in your throat, neck and head.

Sound coming from a conical muffler travels in one direction until it hits something that reflects it.

So u maintain that unless there's an object behind it, you can't hear a motorbike coming towards you even if it has a loud exhaust?

[Oscar]

So u maintain that unless there's an object behind it, you can't hear a motorbike coming towards you even if it has a loud exhaust?

You can hear the sound that is projected forward.
However most of the sound travels in the direction that the muffler is pointed.

Which way do your stereo speakers point?

[steve_t]

You can hear the sound that is projected forward.
However most of the sound travels in the direction that the muffler is pointed.

Which way do your stereo speakers point?

Why do I get the ? You're the one who seems to be implying that unless you're directly in front of the stereo speakers, you won't be able to hear anything. I don't dispute that it'd be louder in front of the speakers or behind the bike, but I don't agree that you have to be directly behind a bike to hear it

[Oscar]

Why do I get the ? You're the one who seems to be implying that unless you're directly in front of the stereo speakers, you won't be able to hear anything. I don't dispute that it'd be louder in front of the speakers or behind the bike, but I don't agree that you have to be directly behind a bike to hear it

It was collective
See the previous contributions, inlcuding the one about sound travelling in all directions. Sound travels in the direction it is projected until it hits a reflective object.

So if an object is projecting (most of its) sound in one direction (via a conical muffler), whilst travelling in the opposite direction, it becomes more and more difficult for someone travelling in front of that object to hear the sound waves as the object accelarates.
The utimate proof of this is the fact that you won't hear a supersonic jet approaching at all as it is outpacing its own sound waves.

A related subject is the Doppler Effect which says the pitch of the sound of a moving object changes relative to a stationary observer.
In fact the work of Doppler and Kadence are the principals upon which the two stroke expansion chamber is based.

[Oscar]

Why do I get the ? You're the one who seems to be implying that unless you're directly in front of the stereo speakers, you won't be able to hear anything. I don't dispute that it'd be louder in front of the speakers or behind the bike, but I don't agree that you have to be directly behind a bike to hear it

It was collective
See the previous contributions, inlcuding the one about sound travelling in all directions. Sound travels in the direction it is projected until it hits a reflective object.

So if an object is projecting (most of its) sound in one direction (via a conical muffler), whilst travelling in the opposite direction, it becomes more and more difficult for someone travelling in front of that object to hear the sound waves as the object accelarates.

The utimate proof of this is the fact that you won't hear a supersonic jet approaching at all as it is outpacing its own sound waves.

[Kickaha]

Could one of you genuises explain to me how sound travelling in the opposite direction from a moving motorcycle can somehow alert the driver of a car in front of that same motorcycle?

That's always something I've been interested in to as traveling hundreds of thousands on kilometres in company vehicles and being passed by bikes hundreds of time has shown me that loud pipes do fuck all as it's not until the bike is alongside that you'll hear them