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 The Trouble with NACA-4digit airfoil sections



Propeller Dynamics

Essential reading for model aircraft contest fliers. This is the only book on the market explaining propeller theory in non-mathematical terms. A rattling good read, I know, I wrote it.

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Frog 500

From David Owen

Good evening, Stuart

Having just read Alwyn's article on incorrectly assembled engines, I thought I should send you the attached scan.

Careful perusal should reveal why many Frog 500s were incorrectly re-assembled by unwitting users.

kind regards and best wishes for the New Year

David Owen

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