Why are pattern props ..... ? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 08-24-2005, 11:42 AM   #1
Claude Paradis
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Why are pattern props ..... ?

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Why are pattern props square? Meaning like 11x11, 12x12, etc. Why such high pitch? Wouldn't you want a larger prop lower pitch to tractor pull through all maneuvers? With such high pitch props these planes must be really moving fast.
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Old 08-24-2005, 01:07 PM   #2
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I suppose this all came about when FAI brought noise rules and Pattern fliers had to reduce there prop rpm to meet the new rules. Consequently there was a demand for engines that could swing propellors under 10k and still provide great power and get the noise down. 2-stroke engines were designed with a longer stroke and the 4 - stroke engine came into its own. Engines designed for pattern are usually very torquey hence they can swing high pitch props and high pitch pitch props work best under 10k rpm thus quieter. Also most pattern aircraft at the time had retracts so they had to keep the diameter down on the prop for ground clearance and also a smaller diameter prop is quieter. These days most pattern fliers are swinging 16" and 17" props in the 8K rpm range with a pitch range beteween 10" and 14" They are looking for the best compromise between vertical performance, constant speed and downline braking. Hope that answers your question.

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