Exemple #1
0
        public void Test()
        {
            var wheel = new Wheel("700x23", "", 333);
            var crank = new Crank(175);
            var chainrings = new Chainrings(new[] {50, 39, 30});
            var cassette = new Cassette("Shimano Tiagra Cassette 9 Speed HG50", new[] {12, 13, 14, 15, 17, 19, 21, 23, 25});

            CalcGears(wheel, crank, chainrings, cassette);
        }
Exemple #2
0
        public void CalcGears(Wheel wheel, Crank crank, Chainrings chainrings, Cassette cassette)
        {
            var wheelSize = wheel.Radius * 2 / 25.4; // to diameter inch
            var radiusRatio = wheel.Radius / crank.Length;
            var numRings = chainrings.Sprockets.Length;
            var numCogs = cassette.Sprockets.Length;
            var rings = chainrings.Sprockets;
            var cogs = cassette.Sprockets;

            var gear = new double[numRings,numCogs];
            var value = new double[numRings,numCogs];
            var ring = new int[numRings,numCogs];
            var ratio = new double[numRings,numCogs];
            var rollout = new double[numRings,numCogs];
            var speed = new double[numRings,numCogs];
            var lspeed = new double[numRings,numCogs];
            var hspeed = new double[numRings,numCogs];

            const int RPM = 90;

            for(var j = 0; j<numRings; j++)
            {
                for(var i = 0; i<numCogs; i++)
                {
                    gear[j, i] = (rings[j] / cogs[i]) * numCogs - i;
                    // inchgears
                    value[j, i] = wheelSize * rings[j] / cogs[i];

                    Console.WriteLine("{0} x {1} = {2}", rings[j], cogs[i], value[j, i].ToString("0.0"));

                    ring[j, i] = rings[j];
                    // Sheldon's ratios
                    ratio[j, i] = radiusRatio * rings[j] / cogs[i];
                    Console.WriteLine("{0} x {1} = {2}", rings[j], cogs[i], ratio[j, i].ToString("0.00"));

                    // rollout
                    rollout[j, i] = value[j, i] * Math.PI;
                    Console.WriteLine("{0} x {1} = {2}", rings[j], cogs[i], rollout[j, i].ToString("0.00"));

                    // speed
                    speed[j, i] = (((rollout[j, i] * RPM) * 60) / 12) / 5280;
                    //lspeed[j, i] = (((rollout[j, i] * lRPM) * 60) / 12) / 5280;
                    //hspeed[j, i] = (((rollout[j, i] * hRPM) * 60) / 12) / 5280;

                    Console.WriteLine();
                }
            }

            Console.WriteLine("Speed ranges");

            for(var i = 0; i<numRings; i++)
            {
                var max = double.MinValue;
                var min = double.MaxValue;

                for(var j = 0; j<numCogs; j++)
                {
                    var s = speed[i, j];
                    min = Math.Min(s, min);
                    max = Math.Max(s, max);
                }

                Console.WriteLine("{0}: {1} - {2}", rings[i], min, max);
            }
        }