Just got back from Daytona and it seems like the first question from the Great Unwashed after "How did you do?" is "How fast did you go?" Given the wheel diameter, front and rear gears, final drive ratio in high gear and RPM.....anyone know the formula to determine mph? So far my answer is "Fast enough to win" but that is redundant after I answer their first question. Any engineers out there?
distance/time or a radar gun to measure same. you'd need the coefficient of friction for the air, determined in your race position, on the bike, in similar atmospheric conditions, and the power to the wheel to calculate it the hard way...
You should be able to actually get that from their scoring system if they put the proper mileage for the track in. Well, for average speed over a lap, not top speed.
I don't know what you've got but if that number is of particular importance to you a GPS lap timer will tell you that. I have a Starlane Stealth GPS that will display your top speed of each lap on the screen, and when you download the data to your computer it tracks your speed at any given point around the entire track. Easy way to tell, like I said if that number is particularly important to you.
Just make something up. Doesn't matter what you say, they'll just reply with "Pssssh, dem Nascars go over two hunnert".
I would say about 201...definitely true in km, maybe not so much in mph. but what's a difference of measure between friends
You don't need those variables to calculate speed. The speed of the wheel is going to be the speed of the vehicle. In this case the wheel speed = angular velocity x tire circumference Since rpm is an angular velocity and you can make a good assumption of tire size, all you need are final drive ratio and gearing.
Engine rpm Times Primary drive ratio Times 6th gear ratio Times Final drive ratio Times Rear tyre diameter Times PIE!!!!
Average speed is easy Got that In fact the winner's average speed is posted on the race results And I get that most racers don't reLly care about the top speed number The question just got me thinking
Next time have someone follow you with their car and match you and take note of what speed it is. I used to do this when I was a kid and the speedometer in my POS beater car broke
This one looks like fun but.... Differential ratio need a little more explanation Must be a combination function of final drive (front and rear sprocket ratio) and 6th gear internal ratio Cool interactive chart though So far my guesses have me at 212 mph Woohoo but probably not
Great idea First let me find someone with a car that will top 150 and see if the track officials will let him follow me on track during the race Should not be too much of a problem