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Old 08-13-2007 | 05:11 PM
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Kweasel
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Default RE: OS.90 FSR Manual or basic Data needed
I have owned and used the old and new OS91s. The old 90/91 provided a better overall experience. Power between the two was about the same when propped around 11,000 RPM. The new 91 has better power/weight and can be used in smaller airframes. The old engine was heavier but had a better carb and lasted longer.
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