engine size?
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From: Chesterfield, MO
120 is 1.2 cubic inches. This is about 20 cubic centimeters. Most gas engines are measured in cc's. So something around 20 cc's is the same displacement as the YS 120.
However, a 20 cc gasser will not typically develop as much power as the equivalent alcohol glow engine. And the YS is a very powerful glow engine.
So a zenoah G23 would be close, but not as powerful. Something around 30 cc's may be close to the same power. And whatever gas engine you choose, it will be heavier than the YS.
However, a 20 cc gasser will not typically develop as much power as the equivalent alcohol glow engine. And the YS is a very powerful glow engine.
So a zenoah G23 would be close, but not as powerful. Something around 30 cc's may be close to the same power. And whatever gas engine you choose, it will be heavier than the YS.



