To Deek, Allison engines suck to f***, I agree, and when they stop, they stop end of story, but I've got two Arrius 2B1A's. They leak a bit of oil but like the Arriel it runs and runs with little or no maintenance input. Slag the French off all you want but they do make exceedingly good engines. I also would have one French donk as opposed to two Allisons. Anybody tried single- engined height climbs in a Bo105, try 50 fpm!