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Showing posts from February, 2013

Setting Blade Pitch for Sensenich Composite Propeller

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Sensenich two-blade ground-adjustable propeller The Sensenich  t wo- b lade  c omposite  p ropeller for  Rotax and  Jabiru en g ines is  light-weight, strong, and  very efficient.   For  our Zenith 601HDS plan e with a Rotax 912 engine, the ground-adjustable propeller  de livers  strong take-of f performance as well as good cruise speed . S moothness through out the entire rpm range rivals that of more complicated and less efficient three-blade pro pellers.  The secret to outstanding pe rformance is a very pr ecise setting of the propeller pitch so that the angles of attack of the two blades differ by less than 0.1 degrees.   Such precision can be achieved with a high-quality propeller protractor where accuracy is guaranteed to be +/-0. 05 degrees for each blade, since then total error between blades is +/-0. 1 d egrees.   The same accuracy can be ach ieved with basic workshop tools and parts. This post shows how. A word of caution. Sensenich supplies detail