Someone here today mentioned that they liked the sound of radial engines. When I say I grew up on a farm, I really mean I grew up on a farm with airplanes AND tractors. My father was a machinist, welder, engineer, A&P mechanic, farmer, flight instructor AND a crop duster. He couldn't cook to save his life though
Here are a couple pictures of one of our Stearmans. He operated the same two airplanes for 50 years...So we had them apart a few times. One of the pictures is the radial after a fresh rebuild. That is how we spent the cold Minnesota winters...wrenching on those things. It is a 9 cyl, 680 ci, 300hp lycoming. We had enough brand new spare parts to operate another 50 years,all bought after WWII surplus for pennies on the dollar.
That's my brother performing a very common task...adding oil.