You might be in for a bad awakening when comparing the reliability and safety statistics of Lycomings to the Rotax engines in Flight Design planes. Even though I entirely share your enthusiasm in general - these “old technologically outdated Lycosaurus engines” are really reliable in comparison…
Rotax engines have been extremely popular in Europe for LSA equivalents - but boy do I recall countless stories of engine failures. The most crazy one was of a flight instructor that had a total of 12 (!?) before he quit flying. A lot has to do I believe with the “creative ways the engine and its components are stuffed into different airframes”.
"Over the 6-year study period between 2009 and 2014, 322 engine failures or malfunctions involving light aircraft were reported to the Australian Transport Safety Bureau (ATSB) and/or Recreational Aviation Australia (RA-Aus). These reports involved single-engine piston aeroplanes up to 800 kg maximum take-off weight.
Aircraft powered by Jabiru engines were involved in the most engine failures or malfunctions with 130 reported over the 6 years. This represents about one in ten aircraft powered by Jabiru engines in the study set having reported an engine failure or malfunction.
Reports from Rotax powered aircraft were the next most common with 87 (one in 36), followed by aircraft with Lycoming (58 – one in 35) and Continental (28 – one in 35) engines.
When factoring in the hours flown for each of these engine manufacturers, aircraft with Jabiru engines had more than double the rate of engine failure or malfunction than any other of the manufacturers in the study set with 3.21 failures per 10,000 hours flown."
(When you read on, it appears the Jabiru engine was improved and now has less failures)
I do not know how widespread Rotax engines are in Australia and how large the GA is there. Also, I do not track standardized failure rates of engine models around the world - but shared anecdotal evidence. Except two instances, ALL reports or stories from friends and acquaintances around engine failures involved Rotax engines (probably 5:1 ratio). Tracking planes with up to 800kg in the study eliminates all Pipers and Cessnas - which I admit I used as a baseline comparison for my statements. I guess the only plane with a Lycoming/Continental engine below 800kg that comes to mind is the Pa18 from the 1940s/1950s.
Now, I definitely do not say that these are bad engines, but there is a lot of chatter in Europe how these engines are plugged into a wide range of airframes and there are more complex system interactions than meets the eye which can cause some problems. Or put differently: C172 and Pa28 are probably among the most common airframes to stuff the Lycomings and Continentals into. I suspect we kind of figured out how to make these work reliably.
Rotax works in MANY many different combinations and many different airframes - so there is that.
> there are more complex system interactions than meets the eye which can cause some problems
I will grant this for sure. Kind of like modern cars though, it's a double-edged sword. On the UAS programme I'm working on it has been absolutely invaluable to be able to just plug into the 912 ECU's CAN bus and gather a ton of engine telemetry (and send it down to the ground for monitoring at the GCS).
Thank you for posting the links and starting the discussion about 912 reliability. I'm going to have to dig into it a little and see if there's any takeaways I need to bring back to my team.
With zero evidence to support this other than my own experience with N=4 of these, I have a suspicion that part of the problem could be that they're not getting sufficient maintenance and inspection because of how simple they are from an O&M perspective and how robust they are in nominal and off-nominal conditions. When I was first working with it and flipping through the operators manual I was kind of shocked to discover that the only real pre-flight actions are: check coolant level, rotate the prop and make sure the oil reservoir burps. There's a startup and warm-up procedure that we follow to the letter but short-term you almost certainly won't notice if you skip it. Before we had our robust telemetry system and checklists in place, we accidentally flew it with only one ECU lane turned on once and didn't notice until we were on the ground. Engine was already off after landing when someone came on the radio and asked "hey guys... in-flight we're supposed to have both lanes A and B on right?" "Yeah..." "The Lane B switch was off when I approached the aircraft...".
To summarize what I'm getting at: this engine, in my experience so far, has a ton of really robust redundancy features and those redundancy features work so well that you may not notice that you've got issues until you've run out of redundancy. I can only think of two situations where we've had issues bad enough that it caused it to "run rough" and trigger a deeper investigation:
- Because our aircraft is unmanned we have electromechanical relays in series with the Lane A/B switches that we can control from the ground both for engine-start safety (the engine can't be started unless both the crew chief and remote pilot have turned on Lanes A and B) and to be able to kill the engine remotely after landing or in an emergency. We had an electrical issue that was causing the relays to chatter, resulting in Lanes A and B getting sporadic power.
- Somehow in one revision of the ever-evolving full-system checklist the "check water separator" item got dropped and no one noticed. It flew probably 10+ flights on that checklist before we had a really rough start, in an environment that was highly conducive to water accumulation in the fuel (large daily OAT and RH swings). We were horrified at how much water came out when I realized that no one had been checking... and yet there had been zero negative effects until there was a big negative effect.
Rotax engines have been extremely popular in Europe for LSA equivalents - but boy do I recall countless stories of engine failures. The most crazy one was of a flight instructor that had a total of 12 (!?) before he quit flying. A lot has to do I believe with the “creative ways the engine and its components are stuffed into different airframes”.