Since I shared this info I have investigated further and found that Rotax 912 ULC has three blades. It could well be an improved version of Rotax. Of course a Ukrainian or TEI engine can not be ruled out either.True, but I wondered whether the TB2 was equipped with a Turkish engine instead of the Rotax?
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Whirlwind Rotax 912/914 Three Blade Propeller | Aircraft Spruce
Whirlwind Rotax 912/914 Three Blade Propeller The WhirlWind GA propeller series are ground pitch adjustable aircraft propellers featuring advanced aerodynamic and composite design.