Quote Originally Posted by Ziptied View Post
What is cheaper about a rotary? Nothing, cost to produce, and rebuild is more than a comparable piston engine. The piston engine will also make more hp per liter, produce more power and torque as well as produce higher MPG.
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.

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.
Why would so many people trust there lives with a motor that is such a "failure in engineering"

We just have different opinions lol. You said you still rebuild rotary engine's? Who do you work for?