Excess of thrust
Monday, May 29th, 2006A big engine can cause problems: it burns lots more gas, resulting in higher operating costs and a shorter range (relative to a smaller engine on the same plane); it weighs more, reducing your useful load and complicating weight and balance; and it has more cylinders and other parts to inspect, repair, and overhaul, resulting in higher ownership costs.
A big engine can also bring a lot of joy: it gives you the option of climbing above problems (icing, turbulence, clouds, mountain waves); it can let you fly faster into a brutal headwind (by trading off some range); it gives you more power for takeoff, reducing distances and increasing your useful load; and most importantly, if your airplane is a radio-controlled model, a grossly overpowered engine allows you to do some pretty neat tricks, as shown in this video on YouTube.