Car engines, scooters, or marine engines don't have a tendency to kill user if they fail for any reason.
Also, the real reason there's almost no new piston engines is that there's no real demand. Especially since you need to certify the plane with the engine as well. Thus we face mostly incremental changes, because any single development won't bring enough demand to justify the changes. Meanwhile there's not enough money in the market to actually try banning the old engines unless you want to cripple a whole sector.
Also, the real reason there's almost no new piston engines is that there's no real demand. Especially since you need to certify the plane with the engine as well. Thus we face mostly incremental changes, because any single development won't bring enough demand to justify the changes. Meanwhile there's not enough money in the market to actually try banning the old engines unless you want to cripple a whole sector.