Romanian IS Designations (Iosif Silimon)

[Apophenia]

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 the IS-28; 200+ built
- IS-29B : single-seat equiv. of IS-28B; 15 m span wooden wings
- IS-29D : 1970 metal-winged dev. of single-seat IS-29B Lark
- IS-29D : Retr. u/c, flaps; airbrakes, all-flying tail/anti-balance trim
- IS-29D2: 1975 as per IS-29D except for conventional tailplane
- IS-29D2 Club: Club class variant; returns to an all-flying tail
- IS-29E: 1971, single-seat, Open class vers. with ballast tanks
- IS-29E2: Vers. of IS-29E with extended, 19 m wingspan
- IS-29E3: Vers. of IS-29E with extended, 20 m wingspan
- IS-29EM: Motorglider, IS-28M2 fuse. & u/c with IS-28MA wings
- IS-29G: Club version; fixed u/c; 16.50 m span flapless wing

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.); 20 m wings; linked flaps/ailerons

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

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

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[hesham]

Hi,


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

 

[Apophenia]

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

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

 

[Maveric]

IS.10...

 

[Maveric]

I.S.26 was a ground effect test vehicle

 

[Maveric]

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

 

[hesham]

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

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

Sorry my dear Apophenia,


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

 

[Apophenia]

Excellent stuff guys! Thanks for filling the gaps

 

[RPF]

I.S.29D vs I.S.29D2. Minor change to aerofoil section to improve low speed manners. Both flapped, incl negative setting. Both retractable long travel U/C. D2 has removable turtle deck offering better access for rigging/derigging. D model had all flying tail with anti-balance trim tab. D2 had conventional horizontal stab and elevator. Personal reference VH-GPO (D2 serial #63) written off Darling Downs, Queensland Australia during the early 2000's in a fatal stall spin accident and VH-GWC (D model serial #50) retired due to life expiry and donated to Queensland Air Museum, Caloundra Queensland. Of interest the I.S.29D/D2 was stressed for unlimited aerobatics, however certification was never sought. I have it on good authority that the factory test pilot was observed performing outside square loops in one back in the day. Richard Friday