Shift keys broken on that computer of yours? Sorry about that, if you compare the car and plane fora, you'll observe that people over here tend to make a stab at proper English. Anyway, there are lots of complaints about the .45 size Tower engines. However, there are also people who say they work fine. Plane engines don't usually get exposed to dust and dirt, so it's rare to use an air filter. Have you lined up someone to teach you to fly?