OS 91 Prop Size w/ large spinner
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OS 91 Prop Size w/ large spinner
Hi Everyone!
I'm about to build a fantasy racer that I scaled up from a free-flight design, designed around the OS 91 FX. The problem is I have to use a 4.5 inch spinner--so what prop should I use? A 13x8 or 13x9? Or bigger?
Thanks,
Nathaniel
I'm about to build a fantasy racer that I scaled up from a free-flight design, designed around the OS 91 FX. The problem is I have to use a 4.5 inch spinner--so what prop should I use? A 13x8 or 13x9? Or bigger?
Thanks,
Nathaniel
#2
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RE: OS 91 Prop Size w/ large spinner
Use the propeller that will correctly fly the airplane. You NEVER size a propeller by the spinner size you're going to use. The propeller must be matched to the engine/airframe combination so that the model has the desired flight performance.
With any propeller, the very inside doesn't do much to help fly the airplane, anyway, so a spinner that has a diameter of 1/4 or less of the propeller diameter isn't going to cause much of a problem.
With any propeller, the very inside doesn't do much to help fly the airplane, anyway, so a spinner that has a diameter of 1/4 or less of the propeller diameter isn't going to cause much of a problem.