Thanks for the linky, we humans are weaker than I thought!Bill in Houston said:
Don't for get to move the decimal for watts to Kw when doing the math!
.745 hp is the figure I came up with for a sprinter pushing out 2000 watts....
Top Speed on a Beast
- Thread starter Bill in Houston
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Don't for get to move the decimal for watts to Kw when doing the math!
.745 hp is the figure I came up with for a sprinter pushing out 2000 watts....
I did some measuring and came up with some solid numbers. The tire is 30" tall. With the 36/18, I measured the rotations. For every 1 rotation of the cranks, the tire (bike) traveled 16 feet. Knowing that should make the rest of the equation easy. How fast do you turn the cranks to do 25mph? I'm still working on it, but will have an answer in the near future. I'm using areas of brain long dormant. My guess is about 75.
Ok, here it is!
You need 330 cranks for 1 mile on the Beast.
25 miles is 132,000 feet.
You must travel 2200 feet per minute to make 25 mph.
To travel 25 miles in one hour on a Beast, you must be cranking at 82.5 RPM.
I'm going to take an early nap.
You need 330 cranks for 1 mile on the Beast.
25 miles is 132,000 feet.
You must travel 2200 feet per minute to make 25 mph.
To travel 25 miles in one hour on a Beast, you must be cranking at 82.5 RPM.
I'm going to take an early nap.
smells like smoke in here from all the brainpower.
definitely less than 142 rpm, because i know my max is about 120 even on a stationary bike. but prolly more than 82.
as far as horsepower and watts:
http://lmgtfy.com/?q=2000+watts+in+horsepower
an all-time internet favorite!
definitely less than 142 rpm, because i know my max is about 120 even on a stationary bike. but prolly more than 82.
as far as horsepower and watts:
http://lmgtfy.com/?q=2000+watts+in+horsepower
an all-time internet favorite!
I don't think that's a beast, but looks like the same tires.
mm hmm, looks like same tires and wheels for sure, and the angle of the top tube and ridiculously long chainstays make the frame look pretty beasty, too. but i think everything else has been replaced.
where on facebook was that photo posted?
where on facebook was that photo posted?
It was a beast. Different fork so they could use a disk brake ....different rear
triangle with different dropouts for the multi speed and electric motor. I bet
that is fun, even though it looks a little busy, with all the extra junk. :shock:
triangle with different dropouts for the multi speed and electric motor. I bet
that is fun, even though it looks a little busy, with all the extra junk. :shock:
I routinely pedal at 90 - 120 rpm. That's from years of racing training. "Spin to Win". Higher rpms means far less stress on the knees and muscles. I've maxed out at 220 rpm on the trainer for 30 second bursts. Using clip in pedals surely helps up the rpms and power output as you use more muscle groups in your legs so each muscle group has to do less work.
Shorter crank arms = higher rpms too but less leverage.
Rick
Shorter crank arms = higher rpms too but less leverage.
Rick
I knew it!
Shows you what I know.
