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Submitted by: Pete

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Prop size really goes hand in hand with the size of motor, rather than anything else. With a badly matched prop, the motor won't perform, regardless of what model it's pulling. 90 size 4 strokes tend to favour props in the 12" - 15" range, say a 12x8 or 14x6, for example. If there are no recommendations made for your model, I think it's a case of trial-and-error to see which works best. I would say a large scale Mustang would require a higher pitch prop to get the faster airspeed. Technically high wing or low wing doesn't make a direct difference to the prop size, but the style of model will determine the required performance, which will be directly effected by prop size. Here's something that should help... <a href="http://www.top-flite.com/accys/topq5000a.html" target="_blank">http://www.top-flite.com/accys/topq5000a.html</a>

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