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Old 12-02-2005, 06:16 PM
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Join Date: Oct 2005
Location: simi valley, CA
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Default RE: Transitional Pitched Prop???


Lots of replies but no one got the main idea. Prop pitch is analogous to the gearing for a car. Going faster needs higher gearing or steeper pitch. For a prop, this is simply because forward motion reduces the actual angel of attach that the prop is seeing. So steep pitch for speed, flat pitch for pull, and the most effective pitch depends on the airspeed and rpm combination. Full size planes use an in flight variable pitch to give the best of both worlds, like having bicycle with more than one gearing available. A varying pitch fixed blade prop design is an attempt to have a little of each. The prop won’t speed or climb as efficiently as a single pitch, but will be generally effective over a broader speed range. It’s like using a multi-viscosity motor oil for your car instead of a straight weight. A compromise.

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