Help Contents

AviaCalc v1.0 Help Index

Introduction

Using AviaCalc

Printing

Calculating Limits

Change Units of measurement

Units Conversion Table


Introduction

AviaCalc is a calculator program that can help  you perform some

conversions and calculations for aeronautics.  This may particularly interest aircraft engineering and instrumentation groups, physicists, pilots, and anyone who may take an interest.

It allows you to:

create calibration tables for aircraft instruments

calculate  Pressure at a given Altitude or  Altitude from a given Pressure

calculate Pitot Pressure from given Airspeed or Airspeed from a given 	Pressure

calculate True Airspeed of aircraft ( using altitude, outside air temperature,

and indicated airspeed of aircraft)


Using Acalc

Using AviaCalc

Using AviaCalc is simple:

Choose the type of calculation you would like from the menu bar.

When the input dialog box appears, enter the appropriate value(s) and press Enter or  click the "OK" button.

To close the input dialog press "Escape" or click  the "Cancel" button.

If  you want to change the input or output units click the "Units" button or press Alt+U.


Printing

Printing  (Registered Version only)

You can print the following conversion Tables :

•	Altitude to Pressure

•	Pressure to Altitude

•	Airspeed to Pressure

•	Pressure to Airspeed

To Print a Calculation/Conversion Table

1.      From the main menu choose the type of conversion you need.

2.      The input dialog box will appear.

3.      Click the "Print" button.

4.      Make any changes to the printer setup by clicking the Printer Setup button or

         press Alt-P.

5.      Enter the start, end, and step values and click the "OK" button or press "Enter."

Note: 	AviaCalc will use the units that are presently selected for the conversion.

Therefore, you should change the units before printing.


Calculation Limits

The shareware version uses only the following unit types  -  feet,  in. Hg,  km/h, °C,

and is limited:

Altitude	0  to 2,000 m

Airspeed	0  to 100 kM/h

Temperature   +20°C  to  +60°C

Registered version of AviaCalc is limited:

Altitude 	-5,000  to 104,000 feet

Airspeed	0  to 550 knots

Temperature	-100°C  to  +100°C  (used for True Airspeed calculations)

and uses the following units for calculation:

(units can be changed at any time during calculations)

Airspeed:

MPH	miles per hour

Knots	nautical miles ( international) per hour

kM/h	kilometers per hour

Pressure:

in .Hg	inches of Mercury

mm. Hg	millimeters of Mercury

in. Water	inches of Water

mBar	milliBars

PSI	Pounds per Square Inch

Pa	Pascal

Altitude:

feet	Feet

meters	Meter

Temperature:

°F	Degree Fahrenheit

°C	Degree Centigrade

°K	Degree Kelvin


Changing Units

Changing Units of Measurement ( Registered Version Only)

To change the current measuring units click the "Units" button ( on any input dialog)

or use the keyboard "short cut"  -  Alt+U.

The Units Selection Dialog will appear.

Select  the measuring units you want, then click  the "OK" button  or press "Enter."

After closing the Unit Selection Dialog, AviaCalc will automatically convert the units for calculations in progress.


Convertion Table

Units Conversion Table

1 foot 	=	0.3048 m

1 mile  = 	1609 m

1 knot	=	1852 m

1 in. Hg 	( at 0°C)	= 	25.4 MM. Hg	( at 0°C)

1 in. Hg	( at 0°C)	=	13.61 in. Water ( at 15°C)

1 in. Hg	( at 0°C)	=	33.86 mBar

1 in. Hg	( at 0°C)	=	0.491 PSI

1 in. Hg	( at 0°C)	=	3386.3 Pa

Temperature Conversion:

t°C  =  ( t°F - 32) / 1.8

t°K  =  ( t°F + 459.67) / 1.8