Breaking 60-0
Thread Starter
|
Advanced
Joined: Dec 2006
Posts: 62
Likes: 0
From: Gulf Breeze, FL
Breaking 60-0
I try to practice panic stops from time to time on back roads when there is no traffic around. On my 2007 FXSTC, I found that from 60-0 it took about 5 seconds counting like one-throusand-one, etc to come to a full stop (without locking anything up). I thought this was pretty good until I computed the distance traveled. I don't think I could stop any quicker unless I risked locking something up.
Compute deacceleration (60 MPH = 88 ft/sec)
V = Vo + AT
0 = 88 (ft/sec) + A(5 secs)
A = -17.6 ft/s**2
Now compute distance traveled:
X = Xo + VoT + 1/2 a T**2
X = 0 + 88(5) + 1/2 (-17.6)(5**2)
X = 0 + 440 - 220
X = 220 ft
I am seeing numbers like 135 ft on sport bikes and some cars. Am I doing this calcualtion correct? It seems all breaking numbers are in feet versus seconds. Has anyone done any testing like this on their softtails?
Compute deacceleration (60 MPH = 88 ft/sec)
V = Vo + AT
0 = 88 (ft/sec) + A(5 secs)
A = -17.6 ft/s**2
Now compute distance traveled:
X = Xo + VoT + 1/2 a T**2
X = 0 + 88(5) + 1/2 (-17.6)(5**2)
X = 0 + 440 - 220
X = 220 ft
I am seeing numbers like 135 ft on sport bikes and some cars. Am I doing this calcualtion correct? It seems all breaking numbers are in feet versus seconds. Has anyone done any testing like this on their softtails?
Road Captain
Joined: Jul 2006
Posts: 671
Likes: 0
From:
RE: Breaking 60-0
You computed right if I remember correctly from my physics days... I have never tried this before, but I would assume it would be hard to go from 60-0 on a motorcycle while trying to count the time in your head. I'm not even sure how long it should take to stop one.
BUT, sport bikes are a lot lighter and cars have a lot better brakes (ABS).
Try starting the stop at a light pole or something on the road and then look back and see how far it "looks". you should be able to get a rough estimate... at least to verify if your timing/calc was right.
BUT, sport bikes are a lot lighter and cars have a lot better brakes (ABS).
Try starting the stop at a light pole or something on the road and then look back and see how far it "looks". you should be able to get a rough estimate... at least to verify if your timing/calc was right.
Thread
Thread Starter
Forum
Replies
Last Post
