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Balloon's classifications
Last update: 2005-04-20


In defining responsibilities of the FAI Air Spot Commissions and calssifications the following definitions apply. These detailed definitions and sub-classifications are contained in the Sporting Code Section 1.

CHAPTER 2 - CLASSIFICATION

2.1   CLASS A: FREE BALLOONS
2.1.1   Class A, free balloons shall be divided into five sub-classes, each containing 15 categories according to size. The sub-classes are the following :
2.1.1.1   Sub-class AA: Free balloons which obtain their buoyancy solely as a result of heating air. The envelope may contain no gases other than air and the normal products of combustion.
2.1.1.2   Sub-class AX: Free balloons which obtain their buoyancy solely as a result of heating air. The envelope may contain no gases other than air and the normal products of combustion.
2.1.1.3   Sub-class AM: Free balloons which use both a lighter-than-air gas and an airborne heater, without pressurisation of any envelope.
2.1.1.4   Sub-class AS: Free balloons which use a lighter-than-air gas and are designed to allow sufficient pressurisation of the envelope to affect performance substantially.
2.1.1.5   Sub-class AT: balloons not falling into subclasses AA, AX, AM or AS.
2.1.2   SUB-CLASS SIZE CATEGORIES
    For each sub-class the size categories are the following :

   

250 m3 and less

 

AA-1

AX-1

AM-1

AS-1

AT-1

250 m3-től

400 m 3-ig

 

AA-2

AX-2

AM-2

AS-2

AT-2

400 m3-től

600 m 3-ig

 

AA-3

AX-3

AM-3

AS-3

AT-3

600 m3-től

900 m3-ig

 

AA-4

AX-4

AM-4

AS-4

AT-4

900 m3-től

1200 m3-ig

 

AA-5

AX-5

AM-5

AS-5

AT-5

1200 m3től

1600 m3-ig

 

AA-6

AX-6

AM-6

AS-6

AT-6

1600 m3-től

2200 m3-ig

 

AA-7

AX-7

AM-7

AS-7

AT-7

2200 m3-től

3000 m3-ig

 

AA-8

AX-8

AM-8

AS-8

AT-8

3000 m3-től

4000 m3-ig

 

AA-9

AX-9

AM-9

AS-9

AT-9

4000 m3-től

6000 m3-ig

 

AA-10

AX-10

AM-10

AS-10

AT-10

6000 m3-től

9000 m3-ig

 

AA-11

AX-11

AM-11

AS-11

AT-11

9000 m3-től

12000 m3-ig

 

AA-12

AX-12

AM-12

AS-12

AT-12

12000 m3-től

16000 m3-ig

 

AA-13

AX-13

AM-13

AS-13

AT-13

16000 m3-től

22000 m3-ig

 

AA-14

AX-14

AM-14

AS-14

AT-14

Above 22000m3

 

AA-15

AX-15

AM-14

AS-14

AT-14

                 
                 
2.1.3  

DETERMINATION OF CUBIC CAPACITY
The cubic capacity of a free balloon shall be calculated from the geometric form of every part of the balloon system when it has the greatest volume which it can achieve in flight. The volume shall be determined in figures rounded to the nearest cubic meter.

2.1.4  

EQUIVALENCE OF GASES
In sub-class AA only, the geometric volume shall be multipled by a factor proportional to the lift of the gas to obtain and adjust volume before determining the category. The factors to be used are:

Hydrogen (H2): 1,5507
Helium (He): 1,4363
Ammonia (NH3): 0,6867

For any other gas, or any mixture of gases, the factor to be used will be:

L / 0,735

where L is its lifting force in kilograms per cubic metre at degrees C and 1013.25 hPa.
To determine L for mixtures of pure gases, the following theoretical lifting forces (kg/m3) shall be used:

Hydrogen (H2): 1,13976
Helium (He): 1,05571
Ammonia (NH3): 0,50474

     
2.2   CLASS B : AIRSHIPS
2.2.1   Class B airships shall be divided into four sub-classes each containing ten categories according to size. The sub-classes are the following:
2.2.1.1   Sub-class BA: Airships which obtain at least 80% of their static lift from a lighter-than-air gas, and which are not included in sub-class BR.
2.2.1.2   Sub-class BX: Airships which obtain their static buoyancy solely as a result of heating air. The envelope may contain no gases other than air and the normal products of combustion.
2.2.1.3   Sub-class BR: Airships which obtain at least 80% of their static lift from a lighter-than-air gas, and in which the complete outer envelope is formed by a rigid framework.
2.2.1.4   Sub-class BT: All other airships, including those in which more than 20% of the lift is obtained from the thrust of the power source.
2.2.2   SUB-CLASS SIZE CATEGORIES
    For each sub-class the size categories are the following :

   

400 m3 and less

 

BA-1

BX-1

BR-1

BT-1

400 m3-től

900 m3-ig

 

BA-2

BX-2

BR-2

BT-2

900 m3-től

1600 m3-ig

 

BA-3

BX-3

BR-3

BT-3

1600 m3-től

3000 m3-ig

 

BA-4

BX-4

BR-4

BT-4

3000 m3-től

6000 m3-ig

 

BA-5

BX-5

BR-5

BT-5

6000 m3-től

12000 m3-ig

 

BA-6

BX-6

BR-6

BT-6

12000 m3től

25000 m3-ig

 

BA-7

BX-7

BR-7

BT-7

25000 m3-től

50000 m3-ig

 

BA-8

BX-8

BR-8

BT-8

50000 m3-től

100000 m3-ig

 

BA-9

BX-9

BR-9

BT-9

Above 100000 m3

 

BA-10

BX-10

BR-10

BT-10

     
2.2.3  

DETERMINATION OF CUBIC CAPACITY
The cubic capacity of an airship is calculated from the geometrical form of the lifting gas containers. The category of an airship shall be according to the greatest volume of lifting gas that can be contained during flight. The volume shall be determined in figures rounded to the nearest cubic meter.

2.2.4  

EQUIVALENCE OF GASES
No equivalence factor is used in class B.

                 
                 
                 

 

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