@wanttaja, how reliable are the Jabiru engines?
I have several ways to assess engine reliability. In this case, it's based on the total number of accidents involving aircraft with that type of engine mounted, vs. the number of cases where the accident was caused by power issues. Power issues include engine-related mechanical failures and those cases where the NTSB was unable to determine a reason for the engine to quit. It does not include cases of pilot mismanagement.
These results are for *all* types of homebuilt aircraft....fixed wing, helicopters, gyros, etc.
Rotax four-stroke engines: 14.7% out of 463 accidents.
Certified aircraft engines: 17.2% out of 2140 accidents
Jabiru: 22.9% out of 118 accidents
Two-stroke engines: 33.6% out of 153 accidents
Auto engine conversions: 37.7% out of 501 accidents
Jabiru had some issues early on; the rate for Jabiru drops nearly a full percentage point if only 2011-2020 are considered (82 accidents).
As mentioned, these results are for all type of aircraft. The engine-failure accident rate for the auto engine conversions rises quite a bit if only fixed-wing aircraft are considered...to 43%. The two-stroke rate rises ~2 percentage points, and the Rotax four-stroke value is up about half a percent.
Keep in mind, this is Experimental Amateur-Built aircraft, not the Special Light Sport/Experimental Light Sport Jabiru-powered aircraft.
Also, a reminder: This is NOT the percentage of aircraft with a given engine type that have an accident. This is a percentage of aircraft that DID have an accident.
Ron Wanttaja