echnical performance is determined
by judging the relative performance in carrying useful loads (for ships
of similar size), or equal loads with smaller ships, which means economy
of operation. The higher figure indicates superior quality. It should be
noted that this constructional figure is applicable only to comparison
of airships of similar size, speed and service requirements. For general
comparison, however, ships of approximately the same size may be
considered.

Thirdly, all-around efficiency (the combined quality figure) is somewhat
arbitrarily chosen by considering both the speed and carrying qualities
together. It is not based on scientific deduction, but rather is a
practical means of estimating general worth, as speed and carrying
capacity are the main requirements of an airship.

[PLATE 27: Zeppelin-Dornier "Komet" All Metal Monoplane, Type
DoCIII, 1920 Model.

Zeppelin-Dornier "Komet" All Metal Monoplane.

Carries six passengers besides pilot and mechanician. One motor
of 185 horsepower.]

Efficiency Characteristics of Some of the Latest and Best Airships of
All Nations

===========+=======================+========+========+======+======+=====
| | | | Efficiency
| |Capacity|Maximum +------+------+-----
Nationality| Type and Name | Cubic | Speed, | | |
| | Meters | Miles |Speed | Lift |All-
| | | per | | |round
| | | Hour | (1) | (2) |(3)
-----------+-----------------------+--------+--------+------+------+-----
Non-Rigid Airships
-----------+-----------------------+--------+--------+------+------+-----
American | Goodyear Pony Blimp | 990 | 40 | 24.2 | 0.60 | 15
French | Caussin T 2 | 9120 | 57.5 | 28.0 | 0.85 | 24
British | NS | 10200 | 57.2 | 25.6 | 0.65 | 17
German | PL27 | 31300 | 55.7 | 27.0 | 0.98 | 26
Italian | T 34 (Roma) | 34000 | 74.2 | 21.5 | 0.68 | 15
-----------+-----------------------+--------+--------+------+------+-----
Rigid Airships
-----------+-----------------------+--------+--------+------+------+-----
British | R 80 | 34000 | 59.7 |