I was not going to bring aircraft's in to this but... The Wankel has many advantages over a piston motor in that field. Lighter, Cheaper, And safer!
Im sure we can go on and on about this. And it seems you are educated with these motors and have spent time working on them. All i am arguing is your ridiculous assumption that the Rotary is a "failure in engineering" which it clearly is not.
In smaller aircraft it is cheaper to use a rotary due to its small size there for allowing a small frontal area for better aerodynamic's and savings in construction costs.
And the most important reason, i couldn't have said it better my self.
Why would so many people trust there lives with a motor that is such a "failure in engineering"Wankel engines that operate within their original design parameters are almost immune to catastrophic failure. A Wankel engine that loses compression, cooling or oil pressure will lose a large amount of power, and will die over a short period of time; however, it will usually continue to produce some power during that time. Piston engines under the same circumstances are prone to seizing or breaking parts that almost certainly results in major internal damage of the engine and an instant loss of power. For this reason, Wankel engines are very well suited to aircraft and to snowmobiles, which often take users into remote places where a failure could result in frostbite or death.
We just have different opinions lol. You said you still rebuild rotary engine's? Who do you work for?