/////////////////////////////////////////////////////////////////////////////
//
// javascript source code for the Futura calculator at:
// http://www.natew.com/frames.cgi/heli/calc/html.FuturaGearing
//
// Nate Waddoups, 8 May 2001
//
/////////////////////////////////////////////////////////////////////////////

var rPi = 3.1415926535;

var g_rClutch = 10;
var g_rMain = 90;

var g_rTotal = 1;

function InitializeRatios ()
{
  g_rClutch = 10;
  g_rMain = 90;

  Solve (null);
  RPM ();
}

function Solve (button)
{
  if (button)
  {
    with (button.form)
    {
      if (button.form.id == "ClutchForm")
      {
        g_rClutch = eval(button.teeth);
      }

      if (button.form.id == "MainForm")
      {
        g_rMain = eval(button.teeth);
      }
    }
  }

  g_rTotal = g_rMain / g_rClutch;

  g_rTotal = Math.round (g_rTotal * 100) / 100;

  document.all["Ratio"].innerHTML = g_rTotal + " : 1";

  RPM ();
}

function RPM ()
{
  document.all["OutputRotorSpeed"].innerHTML = Math.round
	(document.all["InputMotorSpeed"].value / g_rTotal);

  document.all["OutputMotorSpeed"].innerHTML = Math.round
	(document.all["InputRotorSpeed"].value * g_rTotal);
}

/////////////////////////////////////////////////////////////////////////////
// EOF.  Stop reading here ->