RE: Engine suggestions
Kostas:
The OS 10 is a great engine for a plane that doesn't need much power, but does need a lot of nose weight.
Many practical tests have shown the Norvel 0.074 to be not only lighter, but much more powerful than the OS 10. See comments in the 1/8 and 1/2A forum about the two engines.
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Rod:
A 6x4 or 7x3 would be the props to try first. A nice thing about these little engines is that anyone can afford a good selection of props.
Bill.