The Kolko ACA-5 was mentioned and illustrated in AVIATION MAGAZINE No.727, 1978.
On the 9th June 1939 the technical director of SNCAO , former
received a letter from engineer A.Kolko. Recommended by M.Caquot, president
of the SNCA firm
A.Kolko proposed his plans for a complete new aircraft concept.(patent Kolko
Following this patent a tourist aircraft, a bomber to B.5 and a fighter was
suggested all with
a very compact look.
The main principle was to keep the concept compact by placing all elements of the construction as close to the center of gravitity as posibe , wile
still retaining a
Interested by this concept , M.Caquot ordered on the 13th of June a
to be tested in the windtunnel of SNCAO.
Already on the 20th of June M.Kerguistel was ready with his first report
about the results
of the initial windtunel tests.
Despite the longitudal stability was reasonable the stability on the ground
should be far less.
Several modifications to the fins and rudders could only partially solve the
Most of the calculated performances were found correct but the air intakes
for the radiator and the cooling of the engine was very doubthfull.
In general it was concluded that the design had certain technical advantages, but has a lot of problems too..
By letter of the 22th June 1937 from M.Caquot all work at SNCAO was stopped. Maybe longer studies and tests could have resulted in a war winning fighter...
Dimensions and performences.
span:6.38m lenght:3.60m height:2.33m wingsurface:7m?
empy weight 875Kg
total weight 1320 kg. fuel 320L.
armament : two wing machine guns
two fusealge MG and one
Engine : Hispano Suisa 12X of 660HP
3 bladed airscrew of 2m.diam.
max speed : 645 Km/h
cruising " : 350 " "
landing " : 145 " "
climb speed : 31m/sec
range at 4000m. of 1600Km.