Letalski Institut Branko Ivanus Slovenija (LIBIS) Aircraft List

hesham

ACCESS: USAP
Senior Member
Joined
May 26, 2006
Messages
28,360
Reaction score
6,006
Hi,

the Letalski Institut Branko Ivanus Slovenija was a Yugoslavian Institute,formed
in 1947 at Ljublajana,and there was uncertainty Info about the Letov (Yugoslavia)
early series was built by this firm.

KB-1 Triglav I was a sailplane
K2A Triglav II was a sailplane,developed from KB-1
KB-2 Udarnik was a saiplane
KB-3 Triglav III was a saiplane
KB-4 -----?
KB-5 Jadran was a sailplane
KB-6 Matajur was a two-seat low-wing trainer and touring monoplane,powered by one
135 hp Regnier 4L.00 engine
KB-7 -----?
KB-8 -----?
KB-9 was a saiplane
KB-10 -----?
KB-11 Branko was a four-seat low-wing trainer and touring monoplane,powered by one
185 hp Lycoming O=435-1 engine
KBL-12 was a tandem two-seat low-wing jet-trainer and multi-purpose aircraft Project
KB-13 -----?
KBL-14 Mačka was a single seat aerobatic glider
KB-15 -----?
KB-16 -----?
KB-17 was a two-seat advanced glider trainer
KB-18 was a single seat high performance sailplane
KB-19 -----?
KB-20 -----?
KB-21 -----?
KB-22 was a sailplane

any additions or corrections are welcome
 
Last edited:

hesham

ACCESS: USAP
Senior Member
Joined
May 26, 2006
Messages
28,360
Reaction score
6,006
Hi,

I think I saw from long time ago on Internet a small Info about KB-7 Project,it was on forum,can anyone
complete the gaps ?.
 

robertino

I really should change my personal text
Joined
Aug 17, 2016
Messages
102
Reaction score
77
Yes

Kbl Konstrukcijski biro libis ( Letalski Inštitut Branko Ivanuš Slovenija)


Eng. Libis Design Bureau (Aviation Institute Branko Ivanus Slovenia)


earlier it was called differently LETOV Slovenija.
 

Apophenia

ACCESS: Top Secret
Senior Member
Joined
Jul 25, 2007
Messages
2,855
Reaction score
1,492
A couple of additions and corrections. There seems to have been a numerical sequence beginning with the KB-1 but the numerals 1 and 2 are duplicated with an 'LK' series (Letov or Ljubljana + Kuhelj?). A few mysteries include the early dates for the Letov L-21 and L-22 (which some sources insist on giving the name 'Libis').

Obviously, the LIBIS 520 is not part of the regular sequence.

Ljubljana - Letov/LIBIS Aircraft Designations

KB-1 - 1948 Triglav shoulder-winged sailplane
- KB-1: Single-seat high-perf. sailplane, span 15.00 m
- KB-1: Designed to 1947 comp'n for Olympic glider
-- Jaroslav Koser & Stojan Hrovat student design *
-- * Tehniška fakulteta of the Univerze v Ljubljani
-- aka Koser-Hrovat KB-1, Letov Kb-1, aka Koser K2A
-- Triglav after highest peak in Jura Alps
-- KB-1 based on Koser's 1946 Karavan glider project
-- 3v: https://www.modelarstvo.si/wp-content/uploads/2007/04/kb1_pro.jpg
-- https://www.j2mcl-planeurs.net/dbj2mcl/planeurs-machines/planeur-fiche_0int.php?code=1545

LK-1 - 1955 4-seat high-wing lightplane, x 3
- LK-1: 1 x 160 hp Walter Minor, span 13.00 m
- LK-1: Anton Kuhelj design as glider tug*
-- Orig. to have been a side-by-side 2-seater
-- YU-CLN mod. with enlarged tail, dorsal fin
-- 3v: https://www.modelarstvo.si/wp-content/uploads/2019/11/002_LK1.jpg
-- https://www.modelarstvo.si/lk-1/
-- https://www.secretprojects.co.uk/threads/postwar-letov-projects.9733/#post-351772

KB-2 - 1949 Udarnik single-seat sailplane
- KB-2: Shoulder gull wing, span 15.00 m, x 1*
- KB-2: Designed to 1947 comp'n for Olympic glider
-- YU-4014, laminar-flow wings failed to perform
-- KB-2 designed by Dušan Cener & Marjan Slanovec
-- aka Cener-Slanovec KB-2 Udarnik
-- Udarnik translates as 'Striker'/'Shock Worker'
-- 3v: https://www.j2mcl-planeurs.net/dbj2mcl/planeurs-machines/3vues/Cener-Slanovec_KB-2_Udarnik_3v.jpg
-- https://www.j2mcl-planeurs.net/dbj2mcl/planeurs-machines/planeur-fiche_0int.php?code=1562

LK-2 - (Project) 1955 tandem 2-seat high-wing lightplane
- LK-2: Narrow-fuselage version of Letov LK-1
- LK-2: 1 x 160 hp Walter Minor, span 11.30 m
-- 3v: https://www.modelarstvo.si/wp-content/uploads/2019/11/002_LK2.jpg
-- https://www.modelarstvo.si/lk-2/

KB-3 - 1950 Jadran flying boat sailplane
- KB-3: KB-1 deriv. with planing hull + floats
-- Intended for Adriatic* flying clubs, x 6
-- Towed airborne by Aero-2H on floats
-- * 'Jadran' translates as 'Adriatic'
-- KB-3 prototype stored, Nikola Tesla, Belgrade
-- 3v: https://www.modelarstvo.si/wp-content/uploads/2007/04/kb3_pro.jpg
-- https://www.gonzoaviation.com/AwEshop2UserFiles/image/jadralno more 640.jpg

4 - (??)

KB-5 - 1949 Triglav III shoulder-winged sailplane
- KB-5: Single-seat high-perf. sailplane, span 15.00 m
- KB-5: Triglav evol. with impr. cockpit, V-tail
-- Constructed by the Slovenian Aviation Association
-- aka Koser KB-5 Triglav III after Jaroslav Koser
-- 3v: https://www.j2mcl-planeurs.net/dbj2mcl/planeurs-machines/3vues/Koser_KB-5_Triglav-III_3v.jpg
-- http://www.aerozaprega.si/images/razno/kb5/slika2.jpg
-- https://www.j2mcl-planeurs.net/dbj2mcl/planeurs-machines/planeur-fiche_0int.php?code=3100

KB-6 - 1952 Matajur 2-seat monoplane trainer/tourer
- KB-6 : Side-by-side seating, sliding bubble canopy
- KB-6 : Low-winged, fixed taildragger, aka Letov KB-6
- KB-6 : 1 x 135 hp SNECMA-Régnier 4L.00, span 10.60 m
-- aka 'KB-Matajur'
-- 3v: https://www.modelarstvo.si/wp-content/uploads/2019/11/002_matajur.jpg
- KB-6T: Trised 3-seat KB-6 development, x 8
- KB-6T: 1 x 160 hp Walter Minor 6-III-J 6-cyl.
- LIBIS-160: Modernized KB-6T devel., swept fin, x 11
- LIBIS 180: 1965 3-seat glider-tug development, x 10*
- LIBIS 180: 1 x 185 hp Lycoming O-435-1, span 10.60 m
-- * 1 burned at factory, 6 x 180s crash due to stalls
-- LIBIS 180 designed by ing Marjan Slanovec, 1956
-- 3v: https://only-paper.ru/_nw/136/41307053.jpg
-- https://www.modelarstvo.si/libis-180/

7 - (??)
8 - (??)

KB-9 - 1952 single-seat high-performance saiplane
- KB-9: New 16.00 m wing on KB-2 Udarnik fuselage
-- aka Letov KB-9

10 - (??)

KB-11 - 1959 Branko 4-seat low-winged light a/c
- KB-11: All-metal, retr. tricycle u/c KB-6 successor
- KB-11: 1 x 185 hp Lycoming O-435-1, span 10.69 m
-- 5 x KB-11 built, intended as tourer/business type
-- http://old.opensoaring.com/NaKrilih/Pogovor/Pogovori_15/Slike_ivan/Ivot7401.jpg

KBL-12 - (Project) 1954 tandem two-seat jet trainer
- KBL-12: Low-wing, version with side or top inlet(s)
- KBL-12: 1 x 150 kg turbojet engine,* span 6.50 m
-- * Engine speculated to be Turbomeca Palas
-- KBL-12 designed by ing. Marjan Slanovec
-- https://www.modelarstvo.si/kbl-12/

13 - (??)

KBI-14 - 1956 Mačka aerobatic glider
- KBI-14: Single-seat, shoulder-wing, span 10.00 m
-- Letov KBI-14, Mačka also built by Ikarus and SVC
-- https://en.wikipedia.org/wiki/SVC_Mačka

15 - (??)
16 - (??)

LIBIS 17 - 1961 2-seat training sailplane
- LIBIS 17: Orig. known as the LIBIS KB-17
-- Prototype flew Oct 1961, prod. June 1963
- LIBIS 17: Shoulder-winged, span 17.00 m
-- Design team under ing. Jože Prhavc
-- Mixed const., expanded foam stiffening
-- 3v: https://www.modelarstvo.si/wp-content/uploads/2007/04/libis17_pro.jpg
-- https://www.j2mcl-planeurs.net/dbj2mcl/planeurs-machines/planeur-fiche_0int.php?code=3098
- LIBIS 17 (??): Motor-glider conversion, no details
-- https://www.modelarstvo.si/wp-content/uploads/2007/04/libis17b.jpg

LIBIS 18 - 1964 single-seat Standard Class sailplane
- LIBIS 18: 1964 prototype, competed in '65 World Cup
- LIBIS 18: Shoulder-wing, wooden const., span 14.98 m
-- 3v: https://www.modelarstvo.si/wp-content/uploads/2007/04/libis18_pro.jpg
- VTC Trener: 1969 mod. 2nd prototype, all-moving tail
- VTC Trener: Production version by VTC (Vršac), x 50 (?)
-- 3v: https://www.j2mcl-planeurs.net/dbj2mcl/planeurs-machines/3vues/Libis-18_3v.jpg
-- http://www.aeroklub-sarajevo.ba/IstorijaJedrilica/AK Postojna/trener.jpg
-- http://all-aero.com/index.php/60-gliders/15342-vtc-trener

19 - (??)
20 - (??)

L-21 - 1955 'Libis' single-seat training glider
- L-21 : Braced high-wing glider, span (??) m
- L-21 : 1 (or 2), not considered successful
-- L-21 intended to repl. Utva Čavka gliders
-- 3v: https://www.j2mcl-planeurs.net/dbj2mcl/planeurs-machines/3vues/Letov_L-21_3v.jpg
-- https://www.j2mcl-planeurs.net/dbj2mcl/planeurs-machines/photos/Letov-21.jpg

L-22 - 1961 'Libis' 2-seat training glider
- L-22 : Braced high-wing glider, span 16.00 m
- L-22 : Welded steel-tube fuselage, wooden wing
-- aka Letov 22 or Letov L-22, some date '1956'
-- 3v: https://www.modelarstvo.si/wp-content/uploads/2007/04/l_22_pro.jpg
-- https://www.modelarstvo.si/letov-l-22/
-- https://www.j2mcl-planeurs.net/dbj2mcl/planeurs-machines/planeur-fiche_0int.php?code=815

_______________________________________________

Ljubljana - LIBIS Non-Sequential Aircraft Designations

LIBIS 520 - (Project) 1956 light twin monoplane
- LIBIS 520: Low-wing cabin business aircraft
- LIBIS 520: 2 x (??) hp (HO6?), span 10.62 m*
-- Some say 12.72 m, ing. Marjan Slanovec design
-- 3v: https://www.modelarstvo.si/wp-content/uploads/2019/11/003_Libis_520.jpg
-- https://www.modelarstvo.si/libis-520/
 
Last edited:

hesham

ACCESS: USAP
Senior Member
Joined
May 26, 2006
Messages
28,360
Reaction score
6,006
Amazing work as usual my dear Apophenia,

there was also LIBIS 200,but I will check from it.
 

Aubi

ACCESS: Secret
Joined
Aug 31, 2009
Messages
252
Reaction score
346
Website
www.armedconflicts.com
Only small correction - its Udarnik, not Udarnika. While it means striker or even stormtrooper, properly socialist meaning is "shock worker" or "norm-breaker", Stakhanovite.
Some sites mention production of LET L-200 in Ljubljana but I found nothing about it in Czech (or Slovenian) sources.
 
Last edited:

hesham

ACCESS: USAP
Senior Member
Joined
May 26, 2006
Messages
28,360
Reaction score
6,006
Hi,

we must to know that,it was formed in 1947 as Letalski Konstrukcijski Biro,and in 1960 became
Letalski Institut Branko Ivanus Slovenija or LIBIS.
 

Similar threads

Top