The material that the Lazair is made from has a life expectancy of about forever except for one problem, and that 's vibration. There is no way to describe the amount of vibration with words but the Pioneer engines in my opinion transmit a good bit. It's not hand numbing by any means but it does concern me as to the effect it has on the airframe pieces. One engine alone doesn't have much vibration, but when the two are syncronized it can be a good bit. It's actually more of a shutter that runs through the plane. I normally run the engines out of sync so as to lessen this.
Just curious, but do the rotax engines transmit much vibration to the airfame?
Russell