Romanian IS Designations (Iosif Silimon)

Designations of Romanian Designs by Inginerul Iosif Silimon
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IS (Iosif Silimon) Series Designations

While employed as an IAR Brasov engineer in 1949, Iosif Silimon completed his first glider built at and for the Aeroclubul Sânpetru (Sânpetru was a small village neighboring Brasov). The designation may have been IS-1-2 but was more likely IS-2.

Production and development of Iosif Silimon's designs were then undertaken by the successors to IAR-Brasov, URMV-3 (Uzinele de Reparatii Material Volant-3, 1950-1959) and ICA Brasov (Intreprinderea de Constructii Aeronautice).

These gliders and aircraft all retained the IS prefix until very lately when IAR designations (and re-designations) began to appear.
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IS (Iosif Silimon) Series Designations - URMV-3/ICA Brasov

IS-1 -- [??] some sources list first glider as 'IS-1-2'*
-- * NB: 'IS-1-2' is probably confusion with ICAR-1-2 training glider
IS-2 -- 1949, first glider built at/for Aeroclubul Sânpetru
IS-3 -- 1953 wooden glider followed by a range of sub-type variants (below)
-- variants: IS-3, IS-3a, IS-3b, IS-3c & IS-3d (1956), IS-3e (1958), IS-3f (1959)
IS-4 -- 1958 ICA-Ghimbav glider
IS-5 -- 1961 ICA-Ghimbav glider
IS-6 -- ICA-Ghimbav glider
IS-7 -- 1958 ICA-Ghimbav glider
IS-8 -- 1960 ICA-Ghimbav glider
IS-9 -- 1959 ICA-Ghimbav glider
- IS-9A: 1960 motorglider version of IS-9 glider
IS-10 - 1960 ICA-Ghimbav glider
IS-11 - 1957 ICA-Ghimbav glider
IS-12 - 1962 ICA-Ghimbav glider
IS-13 - 1962 ICA-Ghimbav glider
IS-14 - [??]
IS-15 - [??]
IS-16 - [??]
IS-17 - [??]
IS-18 - 1965 ICA-Ghimbav glider
- IS-18/25: 1969 ICA-Ghimbav glider
IS-19 - 1967 ICA-Ghimbav glider
IS-20 - [??]
IS-21 - [??]
IS-22 - [??]
IS-23 - 19?? multi-purpose light aircraft
IS-24 - 19?? utility/sport light aircraft
IS-25 - [?? same as IS-18/25 ??]
IS-26 - 1969 ground effect test vehicle (see Maveric's images below)
IS-27 - [??]
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IS (Iosif Silimon) Series - Marketed with 'IAR' as Maker or Re-Designated

IAR IS-28 - Lark, 1970 2-seat tandem sailplane, all-metal structure
- IS-28: 1970 sailplane, 15m span, fabric-covered control surfaces
- IS-28B: 1973 sailplane, 17m span, performance flaps + airbrakes
- IS-28B1: 197?, detail differences from IS-28B, eliminates flaps
- IS-28B2: 1974 detail differences from IS-28B, retains flaps
- IS-28M1: 1977 Motor Lark motorglider vers. IS-28B2, 1 x 68hp Limbach SL.1700 E1
- IS-28M2: 1976 Motor Lark side-by-side motorglider, 1 x 68hp Limbach SL.1700 E1
-- IAR-28MA - IS-28M2 with new wing, split flaps, 1 x 80hp Limbach L.2000 E01
-- IAR-34: later redesignation of IS-28M2 Motor Lark
-- IAR-46: IS-28M2 dev. as light trainer, 1 x 80hp Rotax 912 F3/A3
-- IAR-46: prototypes built but lack of funding/certification problems

IAR IS-29 - Lark, single-seat version of IS-28, 200+ built
- IS-29B: single-seat equiv. of IS-28B, 15m span wooden wings
- IS-29D: 1970 metal-winged dev. of single-seat IS-29B Lark
- IS-29D2: 1975 retractable u/c, camber-changing flaps, airbrakes
- IS-29D2 Club: retractible u/c, camber-changing flaps, airbrakes
- IS-29E: 1971, single-seat, open-class version with ballast tanks
- IS-29E2: vers. of IS-29E with extended 19m span wing
- IS-29E3: vers. of IS-29E with extended 20m span wing
- IS-29EM: motorglider, comb. IS-28M2 fuse. and u/c with IS-28MA wings
- IS-29G: club version - 16.5m span, flapless wing, fixed u/c

IAR IS-30 - 1978 Twin Lark, IS-28 club var., metal surfaces, fixed u/c, no flaps

IAR IS-31 - single-seat sailplane (IS-29E3 var.), 20m wings, linked flaps/ailerons

IAR IS-32 - 1977 long-span IS-28B2 dev., new 20m double-taper wing, 15 built

IAR IS-33 - IS-29 variant with 150 kg (300 lb) of water ballast tanks

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Hi,


IS-6 and IS-10 were also a gliders.

hesham said:

IS-6 and IS-10 were also a gliders.

Click to expand...

Cheers Hesham! Do you have dates for those designs by any chance? Or details for any other IS designs?

IS.10...

I.S.26 was a ground effect test vehicle

Nothing info about I.S.6.
I.S. 10 was built in 1960 and the I.S.26 1969. Do you need more info...?

Apophenia said:

hesham said:

IS-6 and IS-10 were also a gliders.

Click to expand...

Cheers Hesham! Do you have dates for those designs by any chance? Or details for any other IS designs?

Click to expand...

Sorry my dear Apophenia,


no data I have for IS-6,and I don't know which year it was built.

Excellent stuff guys! Thanks for filling the gaps