Create a RPM channel using the Generate (maths) channel facility in the Graph Screen, Speed x 'Speed to RPM conversion ratio', You will now have an … This calculator works on the simplistic idea that, all other things being equal, changes in weight will cause changes in your VO 2 Max, and therefore performance. Power-Torque Torque (lb.in) = 63,025 x Power (HP) / Speed (RPM) Power (HP) = Torque (lb.in) x Speed (RPM) / 63,025. Determine the increase in engine horsepower when an after market modification, race or performance part has been installed with trap speed. Ignoring the other resistances for the moment, the power needed to overcome the aerodynamic drag is calculated by: Powerdrag = 0.5 * CdA * Air density * Speed3. In case you use a powermeter like this and you want to compare the power that you enter in the above calculator, to the Watts you see on your bicycle computer, you should enter a number below 98% (typically 96-97.5% for amateur riders) for the assumed mechanical losses of your drivetrain. Alas, very few current cars can match the 911's record of weight control. That's the kind of power-to-weight ratio improvement that truly satisfies, isn't it? If you have distance in kilometers, then speed should also be in km/h (kilometers per hour). Now let us get back to the gravitational force. Mass/Weight; Power; Prefix; Pressure; Speed/Velocity; Temperature; Time; Torque; Volume; Unit Converters [2] ... Velocity/Speed Calculator. Find the Vehicle HorsePower to Weight Ratio with Vehicle power and Vehicle weight. This calculator assumes a flat course, a bike equipped with commonly used road bike tires and ideal cycling conditions (no wind, 20°C). In most riding scenarios the aerodynamic drag accounts for the largest part of these forces. Battery Weight (in pounds): A typical battery is 65 lbs. At the same time this dramatic final stage proved the advantage of an aerodynamic position and equipment to a large audience. For the sake of completeness, I would like to mention the gravitational forces, which act when riding up or down a hill. Marketing departments and salesmen will often quote a vehicles horsepower as an indicator of its performance, however horsepower on its own is only one of the factors which determines performance. You enter your power … In most riding scenarios the aerodynamic drag accounts for the largest part of these forces. Headwind is the speed of the wind blowing towards the front of the vehicle. Whether you are test driving your brand new car, or just going for a quick jog or cycle, if you want to know how to find average speed, this calculator will come in handy.. (Ignoring all other forces) one might assume, that riding at a speed of 30km/h in windless conditions requires the same power as riding at 20km/h against a headwind with the speed of 10 km/h. Useful calculators for estimating your speed on a bicycle velocity from various parameters. This calculator estimates your 60 foot, eighth and quarter mile elapsed times and trap speed when given the weight of the car and flywheel or wheel horsepower. One part of the force still pushes the rider towards the road, while the other part either pushes him forwards (in descend) or backwards (in ascend). This is … The chain lubrication, bearings and the gear in use can affect the efficiency of a drivetrain significantly and in the worst case can lead to drivetrain efficiencies as low as 93%. The power of an engine is called as horsepower. Most cyclists use their FTP for their power input to calculate their PWR for an hour (or a standard criterium). Passenger Weight (in pounds): Grade is the percent of incline for the calculation. in Inches : 1/4 Mile ET: 1/4 Mile Top End Speed… Because work equals force times distance, you can write the equation for power the following way, assuming that the force acts along the direction of travel: where s is the distance traveled. (no weather correction). Rider Course Power and Climb Rate; Marco Pantani (123lb/16lb) Alpe d'Huez 8.6 miles, 7.89% grade: 371W = 300 + 3 + 70 5709 ft/hr, 13.681 mph: Jan Ullrich Power To Weight Ratio = (Power / Weight) Power to weight ratio is used to measure the actual performance of any engine or power source as a whole. Note: BMI = weight [kg] / (height [m] * height [m]) BMI<19 signifies underweight, BMI between 25 and 30 slight overweight... With the values from this BMI-Calculator you can check how much a change of body weight or height (or both) would influence the bicycle speed or the required propulsion power. In physics, you can calculate power based on force and speed. This part of the calculator allows you to calculate the FTP of elite cyclists (or yourself), using a cycling performance. This power to weight ratio calculator is capable of accepting inputs in multiple units, for that, you can use the drop-down menu next to the input text box. Road bike drivetrains (with derailleur gears) can have efficiencies up to 98%. Powerdrag wind = 0.5 * CdA * Air density * (Speed+ Headwind Speed)^2 * Speed. However, the object’s speed, v, is just s … If you use a hub powermeter you can enter 100% since the measured power is not affected by losses in the drivetrain. Once there, click on the image of the calculator, and be aware that the process is a little overly complicated. BHP Per Ton List Bicycle Power and Speed Calculator (A more detailed watts to speed calculator. The main factors of aerodynamic drag are the air density (which depends on temperature and altitude) and of course the size and shape of the cyclist and his bike. Torque (N.m) = 9.5488 x Power (kW) / Speed (RPM) Choose which equation you would like to use to calculate the terminal speed at the end of the quarter-mile and the quarter-mile ET; 3. It is equal to thrust per unit mass multiplied by the velocity of any vehicle. 1 hp (English horse power) = 745.7 W = 0.746 kW = 550 ft lb/s = 2545 Btu/h = 33000 ft lb/m = 1.0139 metric horse power ~= 1.0 KVA more power units Comparative Power Outputs Powerrolling = 9.8067 * Weight * cos(Î±) * CRR * Speed, while we can calculate the power related to the forces âpushingâ or âpullingâ us on a hill with. 2. It is equal to thrust per unit mass multiplied by the velocity of any vehicle. To define the latter the drag area CdA is commonly used. Once you have done this you could compare the power to weight with AutoSnout.com's bhp per ton or kw per ton lists. Furthermore note, that this formula is only correct on a level track, since only in this case the gravitational forces are directed entirely towards the road. Who would have thought it, but the rolling resistance mainly depends on the tires (pressure, compound and profile) and the systems weight (rider+bike). Since force and power are not the same, I would like to outline their relation at this point. So far, we assumed perfect cycling conditions without a single breeze. There is a new version of this calculator! In order to determine the gravitational forces, we are interested in the angle of inclination which is calculated by: angle of inclination = arctan(gradient in percent / 100). The gradient of a road is usually stated in percent and indicates the rise over run ratio. Power to weight ratio is the primary factor, but it also takes into consideration the performance advantages of RWD and AWD over FWD, and the advantage of a Manual transmission over an Automatic. By continuing to browse the site, you are agreeing to our use of cookies. Number of passengers: Avg. Bike Calculator Predict speed from power. Trap speed is the velocity or speed of a vehicle at the end of a run or race competition. The answers below will be for at sea level and standard pressure/temperature. Weight is as the car sits on the line; driver and gas in it. Not everything on this page and in the statistics or results might be perfect. Again, ignoring the other resistances for the moment, the power needed to overcome the rolling resistance is calculated by: Powerrolling = 9.8067 * Weight * CRR * Speed. This calculator computes the estimated engine or motor horsepower from trap speed. In order to move at a certain speed, a cyclist has to overcome a number of forces. This results in. Vehicle Weight is the weight of the vehicle with no rider or cargo on it. The horsepower to weight ratio is used to find the performance of the vehicle. Simple Power to Speed Calculator. It is easily calculated by dividing your weight (in kilograms) by your average power output (in watts). Coach Jack Daniels suggests that such a calculation can be useful for those returning to running after a break who may have gained weight due to decreased activity. Calculating power output for human running is complex. For example, if you have speed in mph (miles per hour), time should also be in hours. Effortlessly compute speed or power for all important parameters, such as weight, grade, position and tire type. 3000/54 = 55.56, this creates you a 'Speed to RPM conversion ratio'. In order to use the above speed, distance & time calculator, or do such math on your own, you will need to know two out of three metrics: speed, distance, time. Calculator for solving the power to weight ratio in horsepower and pounds ... Estimate of engine horsepower after a quarter mile run using the trap speed method. The CRR coefficient is commonly used to characterise a tires rolling resistance. Velocity/Speed Calculator. Updated January 22, 2016 | By Bob Fugett Power to Weight Calculator Explained <-- prev | next--> Before reading below try at least once the free online Power to Weight Calculator which automatically calculates your power to weight, speed per watts, and Race Category based on power. Vehicle horsepower To Weight Ratio = 0.0156. For 60 foot, 330 foot and 660 foot split as well use our quarter mile calculator with incremental. Simply said power is defined as work over time, while work is defined as force times distance. On the home page. For example a truck may have over 500bhp but it can be easily out accelerated by a lightweight kit car with just 120bhp. Here the number 9.8067 represents the gravitational acceleration with the unit m/s2 which I omitted in the formula above for reasons of simplicity. Powergradient = 9.8067 * Weight * sin(Î±) * Speed. In the introduction to this 'calculator-insights' I wrote that the rider has to overcome certain forces. Let us call the angle of inclination Î± in the following. It is followed by the gravitational forces, the rolling resistance of the tires and mechanical losses of the drivetrain. Power to weight ratio is used to measure the actual performance of any engine or power source as a whole. In order to move at a certain speed, a cyclist has to overcome a number of forces. This leaves us with: Power = Force*Distance/Time (and Distance/Time = Speed), Now let us go back to the aerodynamic drag which is defined as, Forcedrag = 0.5 * CdA * Air density * Speed^2, By multiplying Force_drag with the speed we arrive at the formulation, Powerdrag = 0.5 * CdA * Air density * Speed^3, Now let us assume there is some headwind with a certain speed. This is a beta version. Click on the "Calculate" button to generate the calculation. A 14% driveline loss is assumed for Wheel HP. But in order to understand these changes we have to go a step back and look a little bit closer on how we established the power formulas in the first place. Enter the vehicle power and vehicle weight in the vehicle horsepower to weight ratio calculator to find the ratio for the same. Here is a table of power output for human walking (0 to 4 mph) and running (5+ mph), for a 60 kg person. These 58 seconds were enough to win the Tour with a time advantage of only 8 seconds. The speed of a cyclist depends on a number of factors. miles, kilometers, meters, yards, feet, and hours, minutes or seconds. This is an estimation, and does not take into account variations in differences in running efficiency. While ascending or descending the gravitational forces do not act perpendicular to the road anymore. Here I strongly recommend you to take a look at the website www.bicyclerollingresistance.com, were you can find a large number of tire-tests together with CRR coefficients for commonly used tire pressures. First of all, we have to take a look at the term gradient. The Power to Weight Ratio (PWR) is the standard that most cyclists use to measure their fitness and improvement. Note: This is a rough and quick estimate of engine horsepower. Now we talked a lot about aerodynamics, gravity and overcoming the forces of nature and did not mention the wind once. It is followed by the gravitational forces, the rolling resistance of the tires and mechanical losses of the drivetrain. Since aerodynamic optimizations, for example changes in a riderâs position) often affect the riders shape as well as his frontal area, the combination of the latter, the CdA, is a popular key figure to measure, compare and optimize the aerodynamic qualities of cyclists. BHP per Tonne Calculator. Examples of high power-to-weight ratios can often be found in turbines. Rider and Cargo Weight is the total weight of the the rider(s) and cargo. Here the Vehicle power is 234 hp and Vehicle weight is 15000 pound. Make up some numbers, doesn't matter, won't hurt a thing. You can adjust these values to see the impact. So the intuitive approach leaves us to a wrong result in this case. Sin(Î±) can therefore be either positive or negative and likewise Power_gradient for riding up- or respectively down a hill. Adjust using real data after you get close. Most powermeters measure the power at the front chainrings or the pedals. The calculators on this page do velocity prediction. Welcome to the oldest and most popular bicycle performance prediction calculator on the web - since 1997. You will need to convert the metrics to the same time and distance units, e.g. This site uses cookies. The speed of a cyclist depends on a number of factors. Choose temperature, altitude, tires, CdA, drivetrain efficiency and calculate the speed for a given power output. Weight is as the car sits on the line: driver and gas in it. Use the calculators below to convert the numbers. Back in 1989 Greg Lemond beat Laurent Fignon in the final stage time trial of the Tour de France by 58 seconds using an aerodynamic helmet and aerobars. This is our very own power to weight, watts to speed, and estimated time to terminal velocity bare bones calculator.) Input the power of the vehicle's engine; 5. 0-60 mph Calculator for Cars This calculator has been designed around statistical averages based largely on sample data from Edmunds.com. Therefore, the rolling resistance changes to. A typical turbocharged V8 diesel engine might have an engine power of 250 kW (340 hp) and a mass of 380 kg (840 lb), giving it a power-to-weight ratio of 0.65 kW/kg (0.40 hp/lb). final stage time trial of the Tour de France. Vehicle Weight (in pounds) Vehicle Horsepower: RPM through lights (finish line) Tire Diameter (Hght.) Secondary Propulsion Weight (in pounds): This could be a kicker motor or an electric trolling motor: Number of Batteries: Avg. For runners of different weight the values will also be different. The unit of the result will depend o… Note that angle of inclination Î± usually has a value between -20Â° and +20 (for descending or respectively ascending the steepest road in the world with a gradient of around 35%). As mentioned in the section about the rolling resistance the calculator above assumes a perfectly level track. If we take the wind into account, what a surprise, we have to make some adjustments to the Powerdrag formula mentioned above. Divide the RPM value by the Speed value i.e. Try out this calculator get a rough estimate of horsepower. The power to weight is a better measurement than just purely quoting the bhp or kW of a vehicle. This web app uses the quarter mile distance or track. Enter the total weight of both the vehicle and the driver; 4. = ( Power / Weight ) Approximate Motor Weight (in pounds): Just a guess, to start. The cycling performance must at least include a distance and a time (and the weight of the biker). This online vehicle horsepower to weight ratio calculator will in comparison of units or designs from one unit to the other. See my Free Android Drag Racing Calculator App in the Google Play Store Vehicle horsepower To Weight Ratio = 0.0156, Engine HP Horsepower Change Calculator - Trap Speed Method. = ( 234 / 15000 ) Therefore, the gravitational forces only appear in the rolling resistance part of the overall speed calculation. Bike Calculator. CdA stands for the product of the frontal area of rider and bike, named A, and the drag coefficient cd (often also cw). Simply enter your gender, age, height and current weight, and we’ll display your ideal body weight in an easy-to-read ideal weight chart. A simple version of the Power to Speed Calculator. For all other factors we entered a standard value. Forcedrag wind = 0.5 * CdA * Air density * (Speed + Headwind Speed)^2. DRAG PERFORMANCE CALCULATOR. Powerno wind = 0.5 * CdA * Air density * (30/3,6 )^3 = 289,35 m^3/s^3 * CdA * air density, Powersome wind = 0.5 * CdA * Air density * (30/3,6 )^2 * 20/3,6 = 192,90 m^3/s^3 * CdA * air density. Power is the Watts rating of the motor. On a road with a gradient of 10% you gain 10m in altitude while covering a horizontal distance of 100m. Our quarter mile calculator for drag racing provides the et time (seconds) and trap speed (mph) based on the horsepower and weight of the vehicle. In recent years the importance of aerodynamics was recognized by most professional and many amateur cyclists. Formula Used: Horsepower_change = (Weight * (Velocity 2 / 234)³) - (Weight * (Velocity 1 / 234)³) Calculation of engine horsepower change using trap speed method is made easier here. Not only does our free, online calculator look at whether your female or male and child, teenager or adult, it also takes into account your personal activity, body type and overall genetic make-up. 0-60 mph calculator The underlying assumptions of this calculator are based largely on sample data from Edmunds.com, among others.Power to weight ratio is the primary factor, but it also takes into consideration the performance advantages of RWD and AWD over FWD, and the advantage of a manual transmission over an automatic. This speed calculator is a tool that helps you determine the average speed of a moving object based on the distance traveled over a certain time traveled.

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