Sethodine
Elio Addict
Ponders certification requirements.
(*shivers*)
I've seen all new engines take over 10 years to get certified. What a nightmare.
The long stroke engine might not be optimized for a propeller without a reduction gear box.
a new head for dual spark plugs, dual ignition sources, single throttle operation, FADEC.... might work.
Although its older brother has flown:
It's been a while since I studied the LSA rules, but I'm pretty sure an Experimental could have an Elio engine without special certification. Of course all the redundancy stuff needs to be in place though.