“ don’t worry bois, the engineer, is engi-here”
The blue engineers Setting up their posse of sentry guns.

OK OK OK I’ll stop.

Sow it has been official the century gun from team fortress two is now coming to SimplePlanes made probably by the efforts of our good friend the engineer.

The Sentry Gun (abbreviated to SG), also known as the Sentry Mechanical Firing Device, Sentry, or Turret, is a building that can be constructed by the Engineer using the PDA, the Engineer's build tool. The gun itself is a tripodal device constructed of metal, team-colored paint, and a laser sight (when used with the Wrangler).
The Sentry Gun functions as an automated turret that fires at the closest enemy within its range and line of sight. Dealing constant as well as consistent damage with noticeable knockback and an immunity to critical hits, a Sentry Gun is the cornerstone of a successful defensive setup. On the other hand, they take a while to set up to full potential, and even a fully-stocked Sentry Gun can be destroyed with little trouble by a well-executed ÜberCharge or a Spy with his Sapper. Engineers must be on the lookout for such threats to ensure their Sentry Gun's survival. (source: TF2 wiki.)

No1 tip
Try not to use the roll or the pitch to quickly or too fast because that’s going to cause a sentry gun to tip over