Nothing against YS, have a box full in the loft and still have 8 gallons of CP30% rotting in the garden shed.
And yes, they're the pinnacle of F3A IC design, like the absolutely magnificent Mallard with the pinnacle of steam powered locomotives.
But the writing was on the wall years ago and today, the YS brand has been equalled - most would say totally eclipsed - by contemporary brands dedicated to other contemporary F3A power trains.
My point, and it hurts me to say, is it's sad to see a brand that once represented the ultimate power package system, having nothing to offer the market other than small variations of a technology that has gone as far as it can go.
The posts from well meaning loyal supporters saying "if YS could come up with a counter rotating prop system.... they'd be onto a winner"... is a case in point. Hello, it's 2021.
Just to reiterate, this isn't a criticism of people that are still enjoying, competing and winning (big) using YS engines.