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Green Science: All of the equipment used in the experiment (at the PPPM end) was powered by the energy being generated during the experiment!
I sat down with the last 5 years of my SRM power data from training, the speed test results from 3 different lakes with V11G and a calculator and tried to come up with a realistic prediction of what my chances are to beat Carter Johnson's 242 km flat water kayaking 24 hour distance record.
Get the Your Badge - Facebook, Linkedin, Twitter, Blog widget and many other great free widgets at Widgetbox! Without drag, the speed of any vehicle would continue to increase as long as energy was being expended to push it forward, and would then continue to travel at the same speed when the energy input was stopped. Rolling Resistance a€“ The force caused by the deformation of the tyre as it rolls over the road surface that slows it down. Aerodynamic Drag a€“ The force exerted on the vehicle by the air, as that air is deflected out of the path of the vehicle. Climbing Resistance a€“ The angulag component of the force of gravity that slows a vehicle as it goes uphill. Knowing that rolling resistance is the greatest part of running resistance a€“ that is: to assume rolling resistance is so small as to be negligible, and on a level road so climbing resistance equals zero a€“ a plot of aerodynamic drag against speed shows a clear difference between the effort required to pedal a bike or a velomobile to the same speed. Ia€™ve converted the aerodynamic drag[1] from a force to power[2] to make it easier to compare the maximum speed per vehicle with the power output from the rider. Matching raw power output figures on the graph doesna€™t give a very good idea of the advantages for an actual human without knowing that persona€™s capability. From the graph, if rider is able to cruise on an upright bike at just over 16mph (26kph) (150W), in a velomobile, that speed would closer to 27mph (43kph). While a fast sprint of 300W doesna€™t get an upright rider faster than 23mph (37kph), in a velomobile, that is 35-38mph (56-61kph).


Frankly, Ia€™m amazed by the efficiency of the Varna Diablo (a 2 wheeled streamliner a€“ similar to the record breaking Varna Tempest) at 150W, any rider would be travelling at nearly 50mph (remember the aero drag is the major part, but not all of, the running resistance), it really shows how inefficient upright bicycles are.
Both the riders in this video are on the same model of recumbent trike, just the cameraman doesna€™t have the QNT Borealis faring.
This is downhill ride with a maximum speed of 101kph (63mph) for the camera-velo and 111kph (69mph) for the yellow one. I needed to consider what the weather conditions would likely be during the attempt, what my realistic power output capabilities are, and the differences between the surveyed course and my actual track.My prediction is that I will cover between 242 km and 256 km. Higher maximum and cruising speeds are possible because the faired cycle has lower drag; and drag is the enemy of speed. Obviously this doesna€™t happen when you ride a bike, your top speed is limited by the energy required to push the air in front of you out of the way. Because rider capability is usually expressed as power capability, reading across a power level gives an idea of the difference in speed per vehicle for the same pedal effort. You'll be faster than a regular bike but slower than the really streamlined VM, at least on the flat. Though aerodynamics is all estimation at the minute — I'll have to wait to test it out to get the actual values. It will be CLOSE, and it will probably be the toughest physical challenge I have ever attempted.When I set the 24 hour human powered vehicle distance record of 1042 km in 2006, we were able to accurately predict my potential distance before the event by testing Critical Power streamliner on the track at various power outputs using the SRM. And when you stop pedalling, this air is moved using kinetic energy from the movement of the vehicle, until you and it come to a stop. While the a€?Reasonable Humansa€? range is a€?from a guesstimation I made from observing myself and a cross section of more average peoplea€? it appears to be a reasonable approximation.


I knew from training and previous 24 hour record attempts, that I was capable of finishing a 24 hour event with an AVERAGE power output of between 110 and 115 watts. This finishing average seems low, but it INCLUDES zeros logged from brief periods when I was not pedalling, and pit stops.
My actual average when turning the pedals around was between 150 and 160 watts.Predicting my distance based on real average power output is basic physics. If we know what the total amount of energy that is put into the system (watts of power), the drag coefficient, and rolling resistance of the vehicle, air density and other environmental factors, then we can fairly accurately predict distance covered.I can do exactly the same thing with V11G and the 24 hour human powered boat distance record. If you look at the speed graph above, you will see that the curve isn't perfectly linear meaning that using an overall average power output shouldn't result in the same average speed that using ACTUAL fluctuating power values would.
Since I finished with a total distance of 1047 km, I calculated that my second half average power would have been 110 watts resulting in a total overall finishing average of 115 watts for the entire 24 hours.
In a perfect world I would attempt the record on a PERFECTLY windless day, but I am not really sure that actually exists. The objective would be to allow my overall average power to drop down to 120 watts, and then observe the total distance covered in the 5 hour test ride.-------------------------------- No matter how good you are or think you are, there is always someone waiting around the corner who can show you how much you really suck.



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Author: admin | 11.10.2013

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Comments to «Estimation of human power output from vertical jump pdf»

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