Kaproni Bulgarski KB-1 
Seven KB-1 Peperuda (butterfly) biplanes delivered from manufacturer in 1932. Licenced-built Caproni Ca 100 with Walter NZ radial engine. Two additional examples finished as seaplanes in 1932. Used for primary pilot training. Date withdrawn from service not known.

Serial	c/no.	Prev. Identity	Delivered	Fate/Notes
LZ-COA	1		1931
LZ-COB	2		1932
LZ-COC	3		1932
LZ-COD	4		1932
LZ-COE	5		1932
LZ-COF	6		1932
LZ-COH	7		1932
-	22		1932
-	23		1932

References:

• Air Enthusiast No.96 November/December 2001 pp10-17
• Air Power of the Kingdom of Bulgaria Part III
• Bulgarian Fighters Part I

Kaproni Bulgarski KB-2UT 
Eight KB-2UT delivered from manufacturer 1933-1935. Licenced-built Caproni Ca 113 with BMW IVa in-line engine, later Junkers L-2 and Hispano Suiza 8Be in-line engine fitted. Used for basic and advanced pilot training. Withdrawn from service by September 1939.

Serial	c/no.	Prev. Identity	Delivered	Fate/Notes
LZ-CTA	8		1933
LZ-CTB	9		1934
LZ-CTC	10		1934
LZ-CTD	11		1934
LZ-CTE	12		1934
LZ-CTF	13		1934
LZ-CTH	14		1934
LZ-CTI	15		1935

References:

• Air Enthusiast No.96 November/December 2001 pp10-17
• Air Power of the Kingdom of Bulgaria Part III
• Wings of Fame Vol.13

Kaproni Bulgarski KB-2A Chuchuliga 
Six KB-2A Chuchuliga (lark) delivered from manufacturer in 1936. Improved version of KB-2UT with Walter Castor radial engine. Used for advanced pilot training. Only 2 serviceable in late 1941. Withdrawn from service in the early 1940s.

Serial	c/no.	Prev. Identity	Delivered	Fate/Notes
LZ-CEA	16		1936
LZ-CEB	17		1936
LZ-CEC	18		1936
LZ-CED	19		1936
LZ-CEE	20		1936
LZ-CEF	21		1936

References:

• Air Enthusiast No.96 November/December 2001 pp10-17
• Air Power of the Kingdom of Bulgaria Part III
• Wings of Fame Vol.13

Kaproni Bulgarski KB-3 Chuchuliga I 
Twenty KB-3 Chuchuliga I delivered from manufacturer in 1937-1938. Improved version of KB-2A with Walter Castor II radial engine. Used for advanced pilot training. Date withdrawn from service not known. The 16th aircraft (c/n 40, LZ-CIP) was retained to act as the prototype for the KB-5 with Piaggio P.VII C.I radial engine and longer fuselage.

Serial	c/no.	Prev. Identity	Delivered	Fate/Notes
1	25		1937	LZ-CIA
2	26		1937	LZ-CIB
3	27		1937	LZ-CIC
4	28		1937	LZ-CID
5	29		1937	LZ-CIE
6	30		1937	LZ-CIF
7	31		1937	LZ-CIG
8	32		1937	LZ-CIH
9	33		1937	LZ-CII
10	34		1937	LZ-CIJ
11	35		1937	LZ-CIK
12	36		1937	LZ-CIL
13	29		1937	LZ-CIM
14	30		1937	LZ-CIN
15	31		1937	LZ-CIO
16	32		1937	LZ-CIP
17	33		1937	LZ-CIQ
18	34		1937	LZ-CIR
19	35		1937	LZ-CIS
20	36		1937	LZ-CIT

References:

• Air Enthusiast No.96 November/December 2001 pp10-17
• Air Power of the Kingdom of Bulgaria Part III

Kaproni Bulgarski KB-4 Chuchuliga II 
Twenty-eight KB-4 Chuchuliga II delivered from manufacturer in 1938-1939. Improved version of KB-3 with Wright Whirlwind R-975 E-2 radial engine. Used for reconnaissance and liaison duties. Some aircraft with 2nd (Basic Training) Escadrila of the People's Air School in 1949. Date withdrawn from service not known. Military register number for the type was 7022. Constructors numbers 45 to 72, individual serial numbers 1 to 28.

Serial	c/no.	Prev. Identity	Delivered	Fate/Notes
1	45		1938
2	46		1938
3	47		1938
4	48		1938
5	49		1938
6	50		1938
7	51		1938
8	52		1938
9	53		1938
10	54		1938
11	55		1938
12	56		1938
13	57		1938
14	58		1938
15	59		1938
16	60		1938
17	61		1938
18	62		1938
19	63		1938
20	64		1938
21	65		1938
22	66		1938
23	67		1938
24	68		1938
25	69		1938
26	70		1938
27	71		1938
28	72		1938

References:

• Air Enthusiast No.96 November/December 2001 pp10-17
• Air Power of the Kingdom of Bulgaria Part III
• Wings of Fame Vol.13

Kaproni Bulgarski KB-5 Chuchuliga III 
Forty-five KB-5 Chuchuliga III delivered from manufacturer in 1939-1940. Differed from the converted KB-4 prototype in having a shorter lower wing, Walter Pollux II radial engine and modified fuselage. Used for reconnaissance and liaison duties. Some aircraft with 2nd (Basic Training) Escadrila of the People's Air School in 1949. Date withdrawn from service not known. Military register number for the type was 7032. Constructors numbers 73 to 117, individual serial numbers 1 to 45.

Serial	c/no.	Prev. Identity	Delivered	Fate/Notes
1	73		1939
2	74		1939
3	75		1939
4	76		1939
5	77		1939
6	78		1939
7	79		1939
8	80		1939
9	81		1939
10	82		1939
11	83		1939
12	84		1939
13	85		1939
14	86		1939
87	49		1939
16	88		1939
17	89		1939
18	90		1939
19	91		1939
20	92		1939
21	93		1939
22	94		1939
23	95		1940
24	96		1940
25	97		1940
26	98		1940
27	99		1940
28	100		1940
29	101		1940
30	102		1940
31	103		1940
32	104		1940
33	105		1940
34	106		1940
35	107		1940
36	108		1940
37	109		1940
38	110		1940
39	111		1940
40	112		1940
41	113		1940
42	114		1940
43	115		1940
44	116		1940
45	117		1940

References:

• Air Enthusiast No.96 November/December 2001 pp10-17
• Air Power of the Kingdom of Bulgaria Part III
• Wings of Fame Vol.13

Kaproni Bulgarski KB-6 Papagal 
Twenty-four KB-6 Papagal (parrot) aircraft delivered from manufacturer in 1941. Licensed-built version of Caproni Ca 309 with Argus As 10C engines, modified nose glazing and redesigned tail. Also known as the KB-309. Maiden flight 28 November 1940. Used for transport, light bomber and reconnaissance roles. Withdrawn from service in 1946. Military register number for the type was 7024. Constructors numbers 118 to 141, individual serial numbers 1 to 24.

Serial	c/no.	Prev. Identity	Delivered	Fate/Notes
1	118		1941
2	119		1941
3	120		1941
4	121		1941
5	122		1941
6	123		1941
7	124		1941
8	125		1941
9	126		1941
10	127		1941
11	128		1941
12	129		1941
13	130		1941
14	131		1941
15	132		1941
16	133		1941
17	134		1941
18	135		1941
19	136		1941
20	137		1941
21	138		1940
22	139		1941
23	140		1941
24	141		1941

References:

• Air Enthusiast No.96 November/December 2001 pp10-17
• Wings of Fame Vol.13

Kaproni Bulgarski KB-11-I Kvazimodo 
One KB-11-I aircraft delivered from manufacturer in 1940. Unofficial nickname 'Quasimodo'. Prototype mid-wing monoplane with fixed undercarriage and Alfa Romeo 126 RC 34 engine. Maiden flight early autumn 1940. Intended for army co-operation and tactical reconnaissance roles. No production. Date withdrawn from service not known. Military register number for the type was 7076. Constructors number unknown, individual serial number 1.

Serial	c/no.	Prev. Identity	Delivered	Fate/Notes
1	?		1940

References:

• Air Enthusiast No.96 November/December 2001 pp10-17

Kaproni Bulgarski KB-11-II 
Six KB-11-II aircraft delivered from manufacturer in 1941. New prototype high-wing monoplane with V-strut attachment to fuselage, new undercarriage design and Alfa Romeo 126 RC 34 engine. Maiden flight 1941. Used for army co-operation and tactical reconnaissance roles. Withdrawn from service in 1947. Military register number for the type was 7076. Constructors numbers 142 to 147, individual serial numbers 2 to 7.

Serial	c/no.	Prev. Identity	Delivered	Fate/Notes
2	142		1941
3	143		1941
4	144		1941
5	145		1941
6	146		1941
7	147		1941	Bulg AF serial 7/7076

References:

• Air Enthusiast No.96 November/December 2001 pp10-17
• Wings of Fame Vol.13
• Sojusznicy Luftwaffe I

Kaproni Bulgarski KB-11A Fanzan 
Third prototype - KB-11-III - maiden flight in 1941. Redesigned fuselage side windows and PZL-Bristol Pegasus XXI radial engine. Forty-three of production version designated KB-11A Fanzan (pheasant) manufactured by end of 1942. Used by 4/1 Orliak for army co-operation and tactical reconnaissance roles. Withdrawn from service in 1947 and 30 survivors supplied to Yugoslavia. Military register number for the type was 7076. Constructors numbers 148 to 190, individual serial numbers 8 to 50.

Serial	c/no.	Prev. Identity	Delivered	Fate/Notes
8	148		1941
9	149		1942
10	150		1942
11	151		1942
12	152		1942
13	153		1942
14	154		1942
15	155		1942
16	156		1942	to Yugoslavia in 1947
17	157		1942	to Yugoslavia in 1947
18	158		1942	to Yugoslavia in 1947
19	159		1942
20	160		1942	to Yugoslavia in 1947
21	161		1942	to Yugoslavia in 1947
22	162		1942
23	163		1942	to Yugoslavia in 1947
24	164		1942	to Yugoslavia in 1947
25	165		1942	to Yugoslavia in 1947
26	166		1942	to Yugoslavia in 1947
27	167		1942	to Yugoslavia in 1947
28	168		1942	to Yugoslavia in 1947
29	169		1942	to Yugoslavia in 1947
30	170		1942
31	171		1942	to Yugoslavia in 1947
32	172		1942	to Yugoslavia in 1947
33	173		1942	to Yugoslavia in 1947
34	174		1942	to Yugoslavia in 1947
35	175		1942
36	176		1942	to Yugoslavia in 1947
37	177		1942	to Yugoslavia in 1947
38	178		1942	to Yugoslavia in 1947
39	179		1942	to Yugoslavia in 1947
40	180		1942	to Yugoslavia in 1947
41	181		1942	to Yugoslavia in 1947
42	182		1942	to Yugoslavia in 1947
43	183		1942	to Yugoslavia in 1947
44	184		1942	to Yugoslavia in 1947
45	185		1942	to Yugoslavia in 1947
46	186		1942	to Yugoslavia in 1947
47	187		1942	to Yugoslavia in 1947
48	188		1942	to Yugoslavia in 1947
49	189		1942	to Yugoslavia in 1947
50	190		1942

References:

• Air Enthusiast No.96 November/December 2001 pp10-17
• Air Power of the Kingdom of Bulgaria Part IV
• Wings of Fame Vol.13