Biker Quiz

[aps45819]

a Kisan pathfinder that constantly flashes your highbeam..

that's when I figured it was Bob

 

[BS Gal]

Well dang, I was thinking BadGirl must have been studying the biker magazines pretty hard while on the throne...

 

[Pete]

Sound is omni directional, but it can be directed, thus the mega phone.

Even a megaphone is not even close to being 50% efficient. Sure with a parabolic dish tuned to the right wavelength you can direct sound with great efficiency, but we are not talking abut that are we?

I am not in any way advocating the ear splitting obnoxious pipes. I am only pointing out to the Sewing machine crowd that louder pipes, while NOT the best method to make you more noticeable, DO in fact make you more noticeable. So if Martha on her cell phone yakking away in her Honda Element hears a rumble to her left which causes her to glance in the mirror to see where it is coming from and she sees me then it worked.

 

[desertrat]

Even a megaphone is not even close to being 50% efficient. Sure with a parabolic dish tuned to the right wavelength you can direct sound with great efficiency, but we are not talking abut that are we?

I am not in any way advocating the ear splitting obnoxious pipes. I am only pointing out to the Sewing machine crowd that louder pipes, while NOT the best method to make you more noticeable, DO in fact make you more noticeable. So if Martha on her cell phone yakking away in her Honda Element hears a rumble to her left which causes her to glance in the mirror to see where it is coming from and she sees me then it worked.

Agreed. Parabolic dish? You have been to the Science Museum in Baltimore haven't you.

 

[ylexot]

Sound is omni directional, but it can be directed, thus the mega phone.

Mmmmmm...will sound propagate in all directions? Yes. Will it propagate equally in all directions? Usually not....and it is frequency dependent. Low frequencies spread more evenly. Subwoofers are usually considered omnidirectional because they are close enough. Higher frequencies get extremely directional. People aim tweeters.

Harleys may have a low frequency sound (I'd guess ~500Hz at 3000rpm) that will spread more evenly than the exhaust note of a sport bike (I'd guess ~4000Hz at 5000rpm), but it is still being directed out the back. If you measured dB around a bike, you'd have a huge spike out the back that would diminish significantly once you get around to the forward hemisphere. So, I wouldn't consider that to be "omnidirectional".

 

[desertrat]

Mmmmmm...will sound propagate in all directions? Yes. Will it propagate equally in all directions? Usually not....and it is frequency dependent. Low frequencies spread more evenly. Subwoofers are usually considered omnidirectional because they are close enough. Higher frequencies get extremely directional. People aim tweeters.

Harleys may have a low frequency sound (I'd guess ~500Hz at 3000rpm) that will spread more evenly than the exhaust note of a sport bike (I'd guess ~4000Hz at 5000rpm), but it is still being directed out the back. If you measured dB around a bike, you'd have a huge spike out the back that would diminish significantly once you get around to the forward hemisphere. So, I wouldn't consider that to be "omnidirectional".

Is equadirectional a word?

 

[Dougstermd]

Lets get back to bob wearing womens panties for a minute!!!

 

[ylexot]

Is equadirectional a word?

I don't think so, but omnidirectional actually implies a somewhat even spread.

Main Entry: om·ni·di·rec·tion·al
Pronunciation: "äm-ni-d&-'rek-shn&l, -"nI-, -(")dI-, -sh&-n&l
Function: adjective
: being in or involving all directions; especially : receiving or sending radio waves equally well in all directions <omnidirectional antenna>

 

[desertrat]

I don't think so, but omnidirectional actually implies a somewhat even spread.

Main Entry: om·ni·di·rec·tion·al
Pronunciation: "äm-ni-d&-'rek-shn&l, -"nI-, -(")dI-, -sh&-n&l
Function: adjective
: being in or involving all directions; especially : receiving or sending radio waves equally well in all directions <omnidirectional antenna>

I'm thinking of a sound source like a firecracker as omnidirectional. A trumpet
would be more directional, like a bike's pipes, but then they weren't designed as warning devices were they?

 

[aps45819]

Euro Crash Study

In half of the collision accidents, the driver of the other vehicle was judged to have made the primary error that caused the crash, and that driver failed to "perceive" the motorcyclist in 70 percent of the two-vehicle collisions.

The failure of drivers to see motorcyclists reinforces the need for motorcyclists to dress conspicuously, and in this study as in others, riders wearing dark clothing were more likely to crash than others. A recent study in New Zealand found that simply wearing a white helmet significantly reduces the likelihood of a crash.

 

[itsbob]

Thank you. I stopped reading after this because the rest is moot. My point is made.

At 5 AM on a Saturday, as it's driving by the house, you bet it gets my attetnion..

You never did answer the question, how loud is it ON your bike as you are driving down the road at say 50 - 55, and how loud is it behind a similar bike at the same speed?


If you were doing a group ride, and they all had the same pipes, which bike would you hear? Yours? The one behind you, or the one directly in front of you? I'd bet you wouldn't hear the one behind you until he ran into you.. or was riding directly beside you, but you would hear the one in front of you the entire ride, and what good does that do, you can see him!!

 

[itsbob]

that's when I figured it was Bob

Sorry, I like posting as her and looking at her butt!!!

 

[itsbob]

Bottom line.. loud pipes, bright lights.. none of it as good as being a well trained, defensive driver.

Don't depend on any of it, ride like everyone is out to get you.

 

[Pete]

At 5 AM on a Saturday, as it's driving by the house, you bet it gets my attetnion..

You never did answer the question, how loud is it ON your bike as you are driving down the road at say 50 - 55, and how loud is it behind a similar bike at the same speed?


If you were doing a group ride, and they all had the same pipes, which bike would you hear? Yours? The one behind you, or the one directly in front of you? I'd bet you wouldn't hear the one behind you until he ran into you.. or was riding directly beside you, but you would hear the one in front of you the entire ride, and what good does that do, you can see him!!

And you have missed the 500000000 times I have said the obnoxiously loud straight pipes are NOT the ones I am talking about.

You know we can sit here and debate sound propagation, huidity, barometric pressure, sound wave shape and it does nto change the fact that the first sentance in your cherry picked article was correct. Louder bikes are more noticable.

If you insist on an answer; ON my bike it is louder than it is ON your bike, therefore if we are both riding up the road MY bike will be noticed before YOUR bike.

 

[itsbob]

Maybe it's the fatigue caused by the noise, maybe it's the attitudes of riders who insist on making annoying noise, or perhaps loud bikes annoy enough drivers to make them aggressive. Whatever the reason, the research shows that bikes with modified exhaust systems crash more frequently than those with stock pipes. If you really want to save lives, turn to a loud jacket or a bright helmet color, which have been proven to do the job. Or install a louder horn.

 

[BS Gal]

Maybe it's the fatigue caused by the noise

, maybe it's the attitudes of riders who insist on making annoying noise, or perhaps loud bikes annoy enough drivers to make them aggressive. Whatever the reason, the research shows that bikes with modified exhaust systems crash more frequently than those with stock pipes. If you really want to save lives, turn to a loud jacket or a bright helmet color, which have been proven to do the job. Or install a louder horn.

Noise makes you fatigued?

 

[itsbob]

If you insist on an answer; ON my bike it is louder than it is ON your bike, therefore if we are both riding up the road MY bike will be noticed before YOUR bike.

Actually last group ride I did (was about 20 back from the lead) the lead rider came back and asked what kind of lights I had on my calipers, he was pulling me out of the crowd in his rear view mirror, so this statement may indeed be false. I was being noticed more then the VTX, and all the Harleys in the group, on my little sewing machine sounding Beemer..

Coming up to an intersection at a high rate of speed, my lights will be noticed before you are heard.

 

[Pete]

Maybe it's the fatigue caused by the noise, maybe it's the attitudes of riders who insist on making annoying noise, or perhaps loud bikes annoy enough drivers to make them aggressive. Whatever the reason, the research shows that bikes with modified exhaust systems crash more frequently than those with stock pipes. If you really want to save lives, turn to a loud jacket or a bright helmet color, which have been proven to do the job. Or install a louder horn.

Bingo! Thank you, I know your attitude about Harleys and those that ride them so I have no doubt your reason for arguing the con point to anything Harley related.

 

[itsbob]

Noise makes you fatigued?

Nobody told you that yet??

 

[itsbob]

Bingo! Thank you, I know your attitude about Harleys and those that ride them so I have no doubt your reason for arguing the con point to anything Harley related.

The loudest bike I had to ride next to was a Honda, so it has nothing to do with Harley, it has to do with Loud and Obnoxious.