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Excellent build and presentation Michal.
I still cant believe how small this aircraft is, I'm surprised it had the power to take off with a pilot in it.
Andy 
It didn't, well not the first time.
On 25th Feb 1925, after some delays caused by engine problems, Lt Zbigniew Barbiński taxied all over Mokotów airfield but could not leave the ground. The problem was that there was not enough power to overcome a very sharp tailskid that cut deeply into the ground. The tailskid was changed and the next day Barbiński managed to get airborne after a long take off run. Further flights followed but their duration had to be drastically curtailed because of the very temperamental power plant.
The Blackburne engine (with and 'e' and nothing to do with the aircraft manufacturer) was supposed to produce 16 hp (not 26) but failed to develop more than 12 hp and rapidly lost power after a few minutes running.
http://en.wikipedia.org/wiki/Blackburne_Tomtithttp://www.flightglobal.com/pdfarchive/view/1924/1924%20-%200338.htmlMuch better results were obtained after modifications to the engine including lowering the compression ratio, but the small diameter propeller designed by Jerzy Drzecykacz for higher speed proved unsuitable.