Definitely one of the more interesting aircraft I’ve come across over the years! Sporting an unusual configuration for what is essentially a motorglider, the HB-21 is quite the performer despite its frail looks, easily rivaling the Piper Super Cub in the climb. Indeed, OE-9129 was bought specifically to replace PA-18 9A-DBU in the glider tow role, with trials revealing it’s more than a match even when hauling a heavy glider such as the Let L-13 Blanik…

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