Letov S-239.16 ie the 16th production S-239 being turned out from the 1933 year. Ten of them were used by Flying Clubs and  Masarykś Flying League units till March 15,1939. Dimensions : Span : 10 m, length 6.14 m, empty weight 375 kg, crew of two
Powerplant : a 85 Walter Minor 4 engine
Performance : top speed 174 km.p.h., limb to 1000 m in 5 min 16 sec, range 420 km

An Letov S-239 upper-wing monoplane powered by a radial Pobjoj R engine of British origin, which proved to be the best one for sporters. But the Pobjoj licence was not purchased and that reason for a Pobjoj-powered production of S-239s was not realized.
Wood-framed wings and tail-plane and fin covered by plywood, elevator and rudder by fabric.Fuselage steel-tube-framed, fabric-covered.

A-100. Though Prague-Vysocany sited Aero Company succeeded in winning the Czechoslovakia Ministry of National Defence bid for a recce and bomber plane in 1932, this type was again a biplane. Discouraged by a failure of  a much more sophisticated last type of A-42 upper-monoplane, designers were not willing to risk again.
This wrong policy of the Ministry proved in several years after the Civil War in Spain broke out in summer of the 1936 year. The German „ Condor Legion „ outbeat the Russia-suppplied „ Ratas “ of the  Republican Air Force.

An shot of an Aero A-100 biplane formation while practicing for Air Show. The letter L means the machines` assigned base is Brno, No 1 Regiment of the 5th Sqn..
After the Aero failure with  an A-42 upper-wing-monoplane early 30s,  designing biplanes went on also in this Company. The concept of an A-100 type proved to be wrong several years later – as recce as bomber planes flown in WW II were monoplanes.

An Avia B-122 acrobatic biplane flown not only by the „Air King „ František Novak, but also by Ambruz and Siroky [Novvahk, Umbroozh, Shirrokee]. Two machines were built by the Avia Comp. in 1934 due to the International Aeronautical Contest held in France
and painted in blue, white and red – the Czechoslovak national colours. Novak launched his splendid aerobatics career here placing the fourth, Ambruz eighth.
Wood-framed wings as well as rudder and elevator fabric covered, tail plane and fin covered by plywood  
Fuselage steel-tube-welded and covered by fabric, sheet metal shaped cowling
Dimensions : Span : 8.85 m, length 6.55 m, empty weight 760 kg
Powerplant : a 260 hp radial Walter Castor II engine, two-blade wooden propeller
Performance : Climb ratio : 8.5 mps, service ceiling 6000 m, range 530 km

Avia A-122 biplane and Lt. František Novak – The King of the Air – who declined to serve with Luftwaffe after the Germans had occupied the Czech and Moravian lands on March 15, 1939. He fled to France via Poland and died there in Apríl 1940. Novak performed aerobatics though having been under knife several weeks ago. His remains were airlifted to Czech Republic in August 2002 and laid in their final resting place at his native village of  Sokolec nr. Nymburk, Central Bohemia.

An fifteen-pcs batch of Avia A-122 Walter Castor aicraft built for an Societ customer. It had been ordered as an reaction of the Societ Union to the very successful performance of the Czech aeronautic pilots on their three A-122s in Moscow on October 15, 1936. Our pilots were invited after the Soviet Military Group had paid a visit to the Czechoslovak Republic in summer of the 1936 year.

An F/O Novak`s Avia BA-122 personal plane on which his mastery of aeronautics was shown by him at Air Shows. Lower surfaces creamy, upper ones red. In addition of these two colours, names of the the places where the „King of the Air “ had performed his skills were added to them along the fuselage port side. Two machines had been built because of the 1937 Zurich International Meeting. Siroky placed second, Novak third, Ambruz eighth.
Dimensions : 8.85 m, length 6.80 m, empty weight 861 kg
Powerplant : a 385 Avia Rk-17 engine   Performance : Top speed 270 km/p/h,  ratio of climb 4 mps, service ceiling 7000 m, range 575 km

An Aero MB-200 /Marcel Bloch 200/ bomber of the Brno Bomber Regiment. The Avia Comp. built under licence 70 machines powered by two 700 Walter K-14 engines, the Aero production amounted 44 ones. This type was outdated even before the 1935 year. The failure of one engine of two resulted in an inevitable crash and death of the crew.
Fuselage as well as wings steel-framed covered by sheet metal plates
Dimensions : Span 22.45 m, length 16 m, empty weight 4474 kg, fixed undercarriage
Powerplant : two 800 Walter K-14s driving three-blade metal propellers
Performance : Maximum speed 245 km.p.h.,but only 205 in reality, climb to 4000 m in 15 min, service ceiling 6000 m
Bombload : 1500 kg, defensive : five machine guns in three turrets. Crew of 4 -5

An Avia B-534 fighter biplane of the second batch armed by two machine guns. Its predecessors had been the B-34 and B-234 types. The B-534 one had been flight-tested in August 1933. Compared with the first prototype, the cockpit was covered by a canopy.
Dimensions : Span 9.4 m, lenght 8.1 m, empty weight 1385 kg, take off-one 1913 kg
Powerplant : an 750 hp Avia HS 12 Ydrs engine

The 99th production Avia B-534 was tested for use of a Letov-made metal propeller.
The Nos I-II batches being built from Feb 1935 were equipped by wooden propellers, the Nos III-IV batches with composite ones. Only cockpit of some machines of the Nos I-II batches were covered by canopy.

Dva stroje vyrobeny firmou Aero pro závod Challenger 1934 jako její první dolnoplošník.  Posádka dvoučlenná plus dva cestující. RoNextí 11, 10 m, délka 7, 80 m, prázdná hm. 560 kg, motor Walter Bora o 200 koních. Max rychlost 255, cestovní 220 km/h, dostup 5 000 m a dolet 800 km. Trup svařen z ocelových trubek, plátěný potah kromě duralových krycích plechů. Dřevěná kostra vzad sklápěných křídel i pevných a pohyblivých ocasních ploch potaženy plátnem.