ORIGINAL: bkdavy
I have an LA 46 that has seen service in 4 planes. Its currently pulling a restored Nexstar. The engine has always been easy to start and reliable. I found the key was not UNDER propping it. Sure it won't run a 10x4 at 14,000, but it will run an 11x5 at 11,000, which is more than enough to service the trainer its on. And it will idle at 2000 rpm with that same 11x5 prop. With a 12 oz tank at 1/4 throttle, I can probably keep the Nexstar in the air for 40 minutes.
Like any other engine, its only as good as its intended purpose.
Brad
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Which prop to use is more a function of the combination of engine/airplane. Sometimes a 10x5 adds that little extra sparkle that helps some trainers flying off of rough grass fields get airborne sooner. Other times and planes, for instance a Sig Senior Kadet with tons of wing area, the 11x5 might be a better choice, as you have pointed out. It is not a black or white situation. There are many variables to consider.
Ed Cregger