Hello HAns.. they are still working on the petrol version....

http://www.ecofly.de/english.htm



Hans Zwakenberg wrote:
Hi group,

can someone please tell me whether efforts are on the way already to
turn the Smart CDI diesel engine into an aircraft engine? I'm looking
for something (preferably a diesel) in the 80HP range. Maximum weight
should be appr. 75 Kg (165 lb). It looks to me the larger of the
Smart CDI's might fit the bill.

thanks!