Letov S-4.8.means the eight machine completed. This fighter plane type was turned out from the 1922 year in a small batch only.
Dimensions : Span 8.1 m, length 6.43 m, empty weight 673 kg
Powerplant : a 220 Hispano Suiza 8 Ba
Performance : Max speed 230 km.p.h., service ceiling 5500 m, climb to 5000 m in 21                         min 50 sec, range 500 km
Armament : two synchronized machine guns

An Aero A-12 bomber was the first compulsorilly fracture-tested type. It was popular among pilots thanks to its good handling and perfect stability. An camera- or radio equipment was in option.
Dimensions : Span 12.80 m, legth 8.34 m, empty weight 1080 kg.
Powerplant : a 240 Maybach Mb-IV engine
Performance : Maximum speed 200 km.p.h, service ceiling 7500 m, range 760 km
Armament : A fixed synchronized machine gun  and twin-one firing rearward for a crewman.

A shot of an Aero A-12 biplane just catching fire on swinging. Not all the mishaps like this ended without crew- or ground staff casualties.

An Aero A-11 type came into existence by fitting an 240 Walter W-IV engine in the Aero 12 airframe. This aircraft was buing built till the 1930 year and used by the Czechoslovak Air Force in recce-, training- ground attack- and bomber versions.
Observer armed by one rearward-firing machine gun and pilot by a fixed synchronized one
Dimensions :Span 12.78 and length 8.20 m, empty weight of 974 kg
Performance : Maximum speed 215 km.p.h., service ceiling 7200 m, range 750 km

A Letov S-6 biplane had been mass-produced from the 1923 year.
Dimensions : 15.69 m, lenght 8.85 m
Wing area :  42.97 sqm
Powerplant : a 240 Maybach Mb-IV engine
Performance : Maximum speed 186 km.p.h., climb to 5000m 31 min 30 sec.
range 780 km

Powerplant : a 300 hp Hispano Suiza 8 Fb engine
Performance : Top speed 246 km.p.h., service ceiling 7500 m, range 550 km, climb to 5000 m in 13 min !! was remarkable – even by 9 min better compared with a BH 22 type.
BH-21s were used also by Belgian Air Force.

A BH-21 fighter plane  was a forerunner of a BH-22 military training fighter. Wings, tailplane, rudder and elevator wood-framed, covered by fabric. Steel-tube skeletal structure of fuselage covered by plywood, one of a fin fabric-covered.

A BH-22 type was used as a military training fighter by the Czechoslovak Air Force.
Dimensions : span 8.90 m, length 6.87 m, empty weight 686 kg
Powerplant : a 180 h.p. Hispano Suiza 8 Aa          
Maximum speed : 216 km.p.h. climb to 5000 m in 22 min

Avia BA-22 specially built aircraft for performing low-level aerobatics flown by Siroky and Hubacek [Shirrokee, Hoobbahchek]. Its predecessor had been a special aeronautic version of BH-22 built  in the 1925 year. This BH-22 piloted by Staff Cpt Malkovsky [Malkovskee] triumped in the 1927 Zuerich International Flying Meeting. Malkovsky lost his life in June 1930 while performing aerobatics on this BH-22 type at the Carlsbad Air Show. His plane broke up and crashed.
Dimensions : 8.9 m, length 6.87 m, empty weight 686 kg
Powerplant : an 180 Hispano Suiza Aa engine
Performance : Climb up to 5 000 m in 22 min, service ceiling 6 200 m, range 500 km
Maximum speed 216 km.p.h. 

Letov S-118. An underpowered S-18 trainer equipped by a 60 Walter NZ engine had been a forerunner of a Letov S-118 type. That reason for the airframe was redesigned for fitting a by 25 hp strenghtened engine. During Cpt. Hamsik`s flying the S-118 to Finland ten machines of this type were firstly ordered by the Fins, but later they insisted on fitting a more strenghtened powerplant. Their demand resulted in S-218`s coming into existence. It was powered by a 120 Walter NZ engine and  turned out in Finland. One of them was seen aloft in Finland even in the 1959 year !!!
Fuselage as well as wings wood-framed
Dimensions: Span 10 m, length 6.90 m, empty weight  of 510 kg
Powerplant :  85 Walter NZ

S-218 with a starter motor in the foreground. S-218.25 means the 25 production one. This traning type was in production from 1926.
Wings wood-framed covered by fabric. Fuselage wood-framed and covered by plywood, in a batch built later it was of steel-tube skeletal structure covered by fabric.
Dimensions : Span 10 m, length 6.9 m , empty weight 510 kg
Powerplant : an 120 Walter NZ engine powering a wooden two-blade propeller
Performance: Maximum speed 150 km.p.h., climb to 1000 m in 5 min 30 sec, range 375 km, service ceiling 4900 m.