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O.S. 25FX and O.S. 25SF

Old 09-21-2003, 01:21 AM
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Default O.S. 25FX and O.S. 25SF

I have two questions related to O.S. engines:

1. Is the O.S. 25FX engine much quieter than the older O.S. 25SF?

2. I am building a small version of the Stik aircraft. What should the approximate weight be if I use an O.S. 10FP engine?

Thanks in advance for your help.

Brian Irwin
Old 09-22-2003, 09:49 AM
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Default RE: O.S. 25FX and O.S. 25SF

Brian,

Noise depends entirely on the muffling system and the propeller used. We'd not think that there'd be much difference in noise between the two engines if you prop them the same.

As far as model weight is concerned, you'll want to stay below 3 pounds or so if you're using a .10-size engine, although lighter is better.
Old 09-23-2003, 06:14 AM
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Default RE: O.S. 25FX and O.S. 25SF

Thanks for your reply Bill. Your help is much appreciated.

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