RPM and speed calculator

_.md

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config.json

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inlet.js

// http://www.crawlpedia.com/rpm_gear_calculator.htm
// RPM = (Axle Ratio x Vehicle Speed x Transmission Ratio x 336.13) / Tire Diameter ] 
// = [ (3.73 x 65 x 1.00 x 336.13) / 31 ] = [ 2628 ]

// Note: 336.13 is used to convert the result to RPM = 
// [63358 inches per mile / (60 minutes per hour x Pi.)]

// Speed  = (RPM * tire diameter) / (Axle Ratio * Transmission Ratio * 336.13) 


var rpm = 500;
var diam = 0;
var axle = 3.73;
var convert = 336.13;
var gear = 1;
var ratio = 0;

//transmission gear ratios
var t1 = 3.0;
var t2 = 1.6;
var t3 = 1.0;
var t4 = 0.7;
var t5 = 0.5;
var tratios = [t1, t2, t3, t4, t5];

switch(gear)
{
case 1:
  ratio = tratios[0];
  break;
case 2:
  ratio = tratios[1];
  break;
case 3:
  ratio = tratios[2];
  break;
case 4:
  ratio = tratios[3];
  break;
case 5:
  ratio = tratios[4];
  break;
default:
    alert("WAT");
}




//controls
trib.rpm = tributary.control({name:"rpm", min: 0, max: 8000});
trib.diam = tributary.control({name:"diam", min: 18, max: 31});
trib.axle = tributary.control({name:"axle", min: 1, max: 4});
 
var speed = (trib.rpm * diam)/(axle * t1 * convert);

var xscale = d3.scale.linear()
    .domain([0, 100])
    .range([0, 100])



var svg = d3.select("svg")
  .append("svg:g")



var equation = svg.append("g")
	.classed("message", true)
	.attr("transform", "translate("+ 25 +", "+ 50 +")");

equation.append("text")
	.text("speed  = (RPM * tire diameter) / (axle ratio * trans ratio * 336)");

equation.append("text")
	.text(speed +" = ("+ trib.rpm +" * "+ trib.diam +") / ("+ trib.axle +" * "+ t1 +" * "+ convert +")")
	.attr("transform", "translate("+ 0 +", "+ 30 +")");

equation.append("text")
.text("gear: "+gear)
	.attr("transform", "translate("+ 0 +", "+ 60 +")");

style.css

.message{
	font-size: 24px;
  	fill: grey;
}