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Aug 27th 2016, 07:33 AM   #46
 ShootPDX's Avatar
 
  May 2016
  Happy Valley area (Clackamas)

  SV650S Silver - HD 1250 Hammer Sportster w/Screaming Eagle stuff - GSXR-750 K12
Sound is 100% directional. Loud pipes DO NOT save lives. Please stop perpetuating this myth. Ask yourself...does my exhaust face in a forward direction so they can hear me coming? The rules of physics do not change because you are on a motorcycle...

Edited by ShootPDX on Aug 27th 2016 at 07:40 AM
Aug 27th 2016, 08:43 AM   #47
 Sentinel's Avatar
 
  Jun 2016
  Poor Tortured

  2013 Kawasaki Ninja 1000 Harlequin
Quote:
Originally Posted by ShootPDX
...Sound is 100% directional. ......
'the fuck?

The thing is not so much that a driver can't hear a bike coming. I mean, we ALL drive cars and I bet most of us have heard that certain howling a motorcycle motor with a nice pipe makes as it approaches us to pass on the highway. but the thing is you cannot always tell where the bike is by simply listening. not knowing where it is, you can't know what to do. (hint: do NOTHING. keep driving just like you are)

we have all seen all the nonsense drivers engage in as they interact with bikes. I have experienced everything from a driver pulling over to the side and stopping so I can pass (please don't do that) to this one guy who, on a blind curve, intentionally sticking his arm out the window and waving me around, indicating for me to pass him, when there were actually cars coming the other way. that othermufcker actually wanted me to get killed right there ( I posted the video on this forum ) and everything in between.

riders have to take their own safety firmly in their own hands. you simply cannot depend on drivers behaviour because it is all over the map, from courteous to homicidal, mostly centring around "don't give a shit", which is probably for the best.

my own strategy is to have the interaction over with before the driver even knows I was there. that way they don't get a chance to participate.

I have been riding since 1975 or so, and I have been on the street since around 1979 and have had only one interaction with a car. It was totally my bad, however the driver DID pull a totally unexpected, last-second maneuver into my path of travel. i ended up on my ass in the ditch and my beautiful 2001 ZRX1200R was demolished like it hit an asteroid at light speed.

that said - sound propagates in a spherical pattern until it hits a barrier. with vehicles that barrier is always the ground. at that point it propagates as a sort of dome shape upward and outward. the value for signal loss, how much the loudness is diminished with range, is about 15logR (it is 20logR for a sphere, and 10logR for a cylinder, so about 15logR for a hemisphere). It most certainly goes outward in all directions. There is _some_ directionality to it, as we all know from riding with others. You can hear better from the rear for the same reason a trumpet sounds louder from in front of it. But the noise does in fact go out "all directions" as anyone who has ever been awakened at 5AM by that one guy who rides a loud ass Harley to work every morning knows.
Aug 27th 2016, 10:04 AM   #48
 
  May 2016
  Port Orchard, WA

  R1200RT, DR650
I dunno about you, but I generally ride a bit over 760mph so nobody hears me coming until I'm already gone.

But I guess if you insist on riding a bit slower than that, the sound will get ahead of you.
Aug 27th 2016, 12:39 PM   #49
 ShootPDX's Avatar
 
  May 2016
  Happy Valley area (Clackamas)

  SV650S Silver - HD 1250 Hammer Sportster w/Screaming Eagle stuff - GSXR-750 K12
Quote:
Originally Posted by Sentinel
'the fuck?

The thing is not so much that a driver can't hear a bike coming. I mean, we ALL drive cars and I bet most of us have heard that certain howling a motorcycle motor with a nice pipe makes as it approaches us to pass on the highway. but the thing is you cannot always tell where the bike is by simply listening. not knowing where it is, you can't know what to do. (hint: do NOTHING. keep driving just like you are)

we have all seen all the nonsense drivers engage in as they interact with

my own strategy is to have the interaction over with before the driver even knows I was there. that way they don't get a chance to participate.
Boom!...thing is...these..."They can hear me, They can see me" people are setting themselves up for a disaster...

1) They can't hear you...and even if they do or did...they're gonna lie about it when they hit you.

2) You can make eye contact with a driver...even exchange winks and nods...and they will still turn left right in front of you...
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