ORIGINAL: Tommygun
That does look like a nice engine. Notice they say it has more power than a modern .60. I still don't get it, why would there be less power today in a new engine instead of more?? That contradicts the nature of advancement. BTW I didn't notice if it has a pump or not.
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How many dedicated modern .61 size pattern engines do you know of being produced and sold today? None.
The old Rossi and YS engines were dedicated to doing just one thing, powering pattern aircraft, so their tuning was different. They were not limited to turning the huge pieces of lumber that today's folks call a prop in the name of reducing noise. They were allowed to rev up near 15k rpm where a two-stroke glow engine really begins to cook.
I don't doubt for a second that these same folks could produce a more powerful engine today, if they wanted to, but they don't. That's what he means.