E6-B program for HP 15C

[Chris W]

I was wondering if anyone had an E6-B flight computer program for the HP
15C calculator. I'm mostly interested in the back side of the E6-B with
course correction for winds. Density altitude, and True airspeed
calculations would also be nice. I could always write the program
myself, but I'm feeling a bit lazy :)

--
Chris W

Gift Giving Made Easy
Get the gifts you want &
give the gifts they want
http://thewishzone.com

[Paul kgyy]

Try a search for handango

[City Dweller]

I wrote the wind correction routine once in C, great excercise in high-school math. Here it is in case you need it.




float fWindAngle, fWindSpeed, fTrueCourse, fTrueHeading, fTrueAirspeed;

// Sample data
fWindAngle = 355;
fWindSpeed = 10;
fTrueCourse = 5;
fTrueAirspeed = 100;

float pi = 3.1415926f;

float fGamma = 180 + fTrueCourse - fWindAngle;
while( fGamma >= 360 )
fGamma -= 360;

// Use theorem of sines
float fSinCorrection = sin( fGamma / 360 * 2 * pi ) * fWindSpeed / fTrueAirspeed; // sin of angle

float fCorrAngle = 360 * asin( fSinCorrection ) / 2 / pi; // angle in degrees

float fCosCorrection = cos( ( 180 - fGamma - fCorrAngle ) / 360 * 2 * pi ); // cos of angle opposite to GS

fTrueHeading = fTrueCourse + fCorrAngle;
if( fTrueHeading > 360 )
fTrueHeading -= 360;

if( fTrueHeading < 0 )
fTrueHeading += 360;

// Use theorem of cosines
float fGroundSpeed = sqrt( fTrueAirspeed * fTrueAirspeed + fWindSpeed * fWindSpeed - 2 * fTrueAirspeed * fWindSpeed * fCosCorrection );



"Chris W" > wrote in message news:Erjqe.25852$rb6.24822@lakeread07...
>I was wondering if anyone had an E6-B flight computer program for the HP
> 15C calculator. I'm mostly interested in the back side of the E6-B with
> course correction for winds. Density altitude, and True airspeed
> calculations would also be nice. I could always write the program
> myself, but I'm feeling a bit lazy :)
>
> --
> Chris W
>
> Gift Giving Made Easy
> Get the gifts you want &
> give the gifts they want
> http://thewishzone.com

[Paul Hirose]

Chris, you might get a better answer by crossposting to comp.sys.hp48.
Despite the group's name, all the HP calculators are discussed there.

--
Paul Hirose >
To reply by email remove INVALID

[Gerry Caron]

Check out www.hpmuseum.org

They have an extensive program list.

Gerry

"Paul Hirose" > wrote in message
nk.net...
> Chris, you might get a better answer by crossposting to comp.sys.hp48.
> Despite the group's name, all the HP calculators are discussed there.
>
> --
> Paul Hirose >
> To reply by email remove INVALID
>

[Chris W]

Gerry Caron wrote:

>Check out www.hpmuseum.org
>
>They have an extensive program list.
>
>Gerry
>
>"Paul Hirose" > wrote in message
nk.net...
>
>
>>Chris, you might get a better answer by crossposting to comp.sys.hp48.
>>Despite the group's name, all the HP calculators are discussed there.
>>
>>
>>
Thanks Paul, I don't know why I didn't think to look there. They had
one for the winds but not for TAS or Density altitude, I guess I will
need to find the formulas for that and program that in myself.

--
Chris W

Gift Giving Made Easy
Get the gifts you want &
give the gifts they want
http://thewishzone.com