Unfortunately this company and it's designation number was completely a mystery ?,I know they produced several other
aircraft,but no-sense for this series ?.
The CNA corporate history is a little convoluted but not really a mystery.
CNA aircraft designs were originally given Greek letter names - Beta, Delta, Eta, Teta (Italian for Theta), ... but they don't seem to be in order (I can't find alfa, gamma, or zeta). In 1935, designations shift to numerals - the CNA 15 and CNA 25 that you've mentioned. Then there is the distinct PM-1 of 1939/'40 (standing for Politecnico di Milano). CNA's original aircraft developments all seem to be experimental types built under contract to the Ministero dell’Aeronautica. CNA also developed a range of series production engines (with numerical designations prefixed by 'C') for light aircraft.
The corporate identity changed often. CNA was established in 1920 by
il conte Giovanni Bonmartini but it existed under a number of names. The earliest incarnation was the Cooperativa Nazionale Aeronautica of March 1920 relating to the flying school at Rome (Cerveteri). In late November 1921, the firm becomes the Compagnia di Navigazione Aerea. Then, in 1922, another renaming for a joint venture with
Ing Giovanni Pegna - the Costruzione Navali Aeronautsche.
Costruzione Navali Aeronautsche projects were the unbuilt multi-rotor
Elicottero and
Leonardo da Vinci (16-engined transatlantic
idrovolante); the 1923 Pegna Bonmartini P.B.N. 4-engined (push-pull) biplane (aka Piaggio P.3); the 1923 single-seat ultralight Pegna-Bonmartini
Rondine ('Swallow', aka CNA PB
Rondine, Piaggio P.1); the unbuilt 2-seat Pegna-Bonmartini
Rondone ('Swift', 45 hp Anzani); the built Pegna-Bonmartini
Rondone Tipo 2; and the Caccia Pegna (aka Piaggio P.2). See:
https://modellismoitalia.altervista.org/pegna-bonmartini/
The final rebranding occurred after Pegna and Bonmartini parted ways. CNA then stood for the Compagnia Nazionale Aeronautica. In 1934 Bonmartini sold CNA to Caproni. Small-scale series production began of Caproni Ca.100s (1935-1937) and SAIMAN 202s (1940-1941). This was a fairly small operation - total production of all types by CNA was only 188 airframes.
Original Designs built by the Compagnia Nazionale Aeronautica
CNA
Beta - 193? (??) no other details
-
Beta: 1 x 170-180 hp CNA C.7 9-cylinder radial engine
CNA
Delta - 1931 trimotor low-winged passenger monoplane
- CNA
Delta: 2-4 passengers, optional postal aircraft
3 x 90 hp Fiat A.50 radials, alt: 138 hp A.54, 160 hp CNA C.7
- CNA
Delta: Mixed construction (wood & fabric-covered steel-tube
--
http://tof.canardpc.com/preview2/2a768858-e3d9-4cf3-9c30-1fe7f08dd3ad.jpg
CNA
Eta - 1933 1-or-2-seat parasol-winged lightplane, x 1*
- CNA
Eta: Tandem or solo seat, landplane or on floats
- CNA
Eta: (Orig.) 1 x 180 hp CNA C.7 9-cylinder radial
-- Single-seat float
Eta FAI C.II altitude record, 8,411 m
-- Single-seat land
Eta FAI C.II altitude record, 10,008 m
- CNA
Eta: (Mod.) 1 x 150 hp CNA C.VI 6-cyl., span 10.00 m
-- 2-seat float
Eta FAI C.I 100 km circuit record, 192.62 km/h
-- * Some sources say x 2 (more likely same airframe modified)
--
http://www.airwar.ru/image/idop/law1/eta/eta-1.jpg
--
http://www.airwar.ru/image/idop/law1/eta/eta-2.jpg
CNA 2*
Merah - 1934 2-seat low-wing monoplane, x 1
- CNA 2
Merah: 1 x (??) hp CNA (type?) engine, span (??) m
-- * See
hesham's reply
#82
CNA
Teta - 1933 tandem 2-seat, single-engined light biplane
-
Teta: Radial engine, poss. highly mod. Breda Ba.25 (??)
-
Teta: (??) No other details
CNA 15 - 1935 4-seat cantilever low-winged sportsplane
- CNA 15: Designed specif. for Littorio sports a/c races
- CNA 15: Parallel development to high-wing CNA 25 (qv)
- CNA 15: 1 x 150 hp CNA C-VI IRC.43 6-cyl., span 11.78 m
-- 1937, turbocharger increased ceiling to 9,000 metres
-- CNA 15 MM307 to Luigi Tonegutti (Verona) 1939, I-VIVI
CNA 25 - 1935 4-seat cantilever high-winged sportsplane
- CNA 25: Parallel development to low-winged CNA 15 (qv)
- CNA 25: 1 x 150 hp CNA C-VI IRC.43 6-cyl., span 11.78 m
- CNA 25: Lower-performing CNA 25 not further developed
- 3v:
http://www.airwar.ru/image/idop/law1/cna25/cna25-1.gif
CNA PM.1 - (Politecnico di Milano) 1939 student lightplane, x 1*
- PM.1: 2-seat cabin a/c with a cantilever high-wing monoplane
- PM.1: Designed for a student competition, design begun 1938
- PM.1: 1 x 60 hp CNA D.4 air-cooled HO4 engine , span 10.60 m
- PM.1: Plywood-covered wooden airframe, side-by-side seating
-- Assigned reg. I-ACGM in 1940 by Ministero dell’Aeronautica
-- * Aug 1942 order x 10, airframes destroyed by bombing July 1943
-- By the PM's Instituto di Construzioni Aeronautische del Regio
Does anyone have more on CNA aircraft?