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Wooden prop and Jett 50LX

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Old 08-21-2009, 07:01 PM
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jplavoie
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Default Wooden prop and Jett 50LX

Hi,

I have several Zinger wood prop that have suitable dia. and pith for my 50LX (9x7, 9x8,10x6). I was just wondering if high RPM such as those reached with Lx engine allow to use wood props without risk. Are they more likely to break apart under high RPM? They seem a bit fragile to me when compared to APC or similar composite prop. If you have some experience with them please let me know.

Thanks
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Old 08-22-2009, 10:00 AM
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bob27s
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Default RE: Wooden prop and Jett 50LX

Thanks for writing.......

Wood is actually one of the strongest materials around. The original "nature designed" continous fiber material. No issues there.

We used wood props for sport flying and racing for many years. A few of us still do from time to time.

The issue we had racing with "stock" wood props was consistancy ..... pitch and thickness from prop-to-prop. APC fell into favor (when made legal) because they are nearly identical from prop to prop.

Also..... the APC D-1 series racing props are the only ones really designed for 19,000+ rpm range. The standard C-2 series 9x7, 9x8, 10x6 are good up to about 19,000.... which is ok for the 50LX engine.

Go ahead and use the wood props.

Visually look at the prop grain - make sure it is relatively straight.
BALANCE the props. Wood is rarely balanced from the package.

Of the props you listed, try the 9x7 first. Be sure it hits the rpm range need for your engine (you are looking for 17,000 rpm ground peak or higher).

If the engine is running well, you can try the 9x8 and 10x6 also... although the wood 10x6 might be a bit too much load.

Bob
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