height mount snowdon
2008
What are the benefits and losses of calorific value for cycling in a gradient / different surfaces?
I have a calculator that calculates calories burned during a walk. Obviously there are figures quoted by the whole network, but I would like to upload a GPX theme, which is in the highest, and then tell the computer "ok, 50% were on the road, 25% were on the cinder track, 20% were on the turf course and 5% was on rough ground. I am sure that everyone agrees that "the bike at 5 mph" on the seafront of Hastings is very different to the bike on top of Mount Snowdon 5 mph for an hour! Be there are many other factors come into play, I just thought this would be a fun project to get an idea of the changes in rolling resistance, gravity, freewheel downhill assistance, etc. etc. So if anyone knows how to calculate the gain on record going uphill, and the loss of burning going downhill, I'd be interested!
The power required to move a bicycle can be divided into three areas. Wind resistance, rolling resistance and gravity. A bicycle is quite efficient, can usually rely on less than 5% losses. So any final number should be multiplied by 1.05. Here are the formulas that have to do their calculations. We hope you can work in the branch metric for wind resistance = 1 / 2 * Cd * A * ρ * V3 Power for rolling resistance Crr = * W * cos (atan (G)) * v supply for the gravity (-o + depending on up or down) = W * sin (atan (G)) * V Cd is the drag coefficient (around 0.9 for most bikes) A is the frontal area of rider and bike section (m2) ρ air density (varies depending on conditions atmospheric (1.22 kg / m 3 typical) v is the velocity in feet per second is Crr coefficient of rolling resistance. This will vary depending on the surface of the tire be mounted on a. (A typical asphalt bike will be about 0.006-0.01) much higher in the soft sand. W is weight in kg (rider and bike) G is the degree of the hill percent instead of adding these until you get an answer in Watts (Joules per secondeasily becomes calories) This is the power to move the bike. The body human is usually about 24-25% efficiency for a total of multiple burns the power required to move the bike by 4. A heart rate monitor will give a good approximation for the average effort. For this kind of thing is not as useful as it is a fair deal of time to stabilize the exchange rate. In general, the same pace Cardiac mean the same power. This can be useful when you need to resolve the variations in rolling resistance coefficient. A much more easy it is to hire a power meter and mount / register for the course. Have fun with your project.
Mount Snowdon Railway (4/5) – Awesome view from the top of Mount Snowdon
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