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Rogozarski SIM-X
One SIM-X prototype delivered in early 1937 for testing and evaluation. Parasol wing primary trainer. After preliminary testing two orders were placed for a total of 20 aircraft. The last airframes were delivered during 1938, with the final three being given to the Yugoslav Royal Aero Club. Production aircraft were slightly different from the prototype, mainly by having a deeper NACA cowling. 120 hp Vlajkovic Walter NZR radial engine, although one aircraft later received a 132 hp Gipsy Major I engine. The type was used by the JKRV as well as by local aero-clubs for glider towing.

The SIM-X prototype was modified in early 1940 to serve as an instrument flying trainer - with new cockpit instruments, a front cockpit cover and 120 hp Walter Major 4 engine. Designated Si-Xip, the new version was not a success. The original Walter NZR engine was re-installed in early 1941 and the aircraft redesignated SIM-Xa.

Just before the April 1941 attack, five civilian examples were impressed into JKRV service. The majority of the aircraft were destroyed on the ground during German aerial attacks, but three were captured by the Germans and one of these was passed to the Croatian Air Force.

(The prototype and first ten production aircraft were initially given civil registrations).

Serial c/no. Prev. Identity Delivered Fate/Notes
301 1 YU-PDY 1937 first reg'd 1936, to JKRV 1937
302 2 YU-PDZ 1937 first reg'd 1937, to JKRV June 1937
303     1937  
304     1937  
305     1937  
306     1937  
307     1937  
308     1937  
309     1937  
310     1937  
311     1937  
312     1938  
313     1938  
314     1938  
315     1938  
316     1938  
317     1938  
318     1938  
319 19 YU-PFJ 1938 to Yug. Royal Aero Club Aug 1938
320 20 YU-PFK 1938 to Yug. Royal Aero Club Aug 1938
321 21 YU-PFL 1938 to Yug. Royal Aero Club Aug 1938


  • LET No.1 (Yugoslav Aviation Museum)

Rogozarski SIM-XI
One SIM-XI prototype delivered in early 1938 for testing and evaluation. Single-seat parasol wing aerobatic trainer developed from the SIM-X. 150 hp Siemens Sh 14a engine. No production order. In April 1941 the prototype was captured by the Germans and passed to the Croatian Air Force.

Serial c/no. Prev. Identity Delivered Fate/Notes


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First Created: 26 August 2006 - Last Revised: 4 November 2006
Copyright © 2006 John Hayles.     e-mail: john@aeroflight.co.uk