"Grumman-581" wrote in message
news
On Wed, 10 Jan 2007 18:31:29 +1100, in ,
d&tm wrote:
The bank angle is in what ever units you want. it is the angle
expressed as degrees or radians that gives a tangent of 2*PI*v /( g*t)
(sorry I should have put in the brackets) check your equation with a
standard rate 1 turn. At 100kts a rate 1 turn will have t =120 seconds
and give a bank angle of 15.4 degrees.

I tried it both ways today and pretty much figured that it needed the
parentheses around the "g*t"... The atan function was returning things in
radians, so that's what gave me the brain fart...

I'm getting approximately 15.175 degrees for a bank angle, but that's
probably because I'm using a more accurate measurement for pi and g... Not
that it is likely to really matter since when I graph it, putting it to
the nearest degree will probably be accurate enough... Haven't decided if
I want to redraw the gauge each time or have a set of predrawn images that
I shift around indexed by the bank angle...

Its close but is it close enough at greater angles.? what are you using for
the conversion of speed.? I used g =9.8 Pi as 3.14159 and v = kts
*1852/3600 m/s
terry