black triangular aircraft , Scarborough uk

My dog started to bark and ran to the patio doors , then I started to hear a normal aircraft noise however it began to get redicoulisly loud, it then started to make a noise like an exelurating aeroplane/jet I thought it was crashing but it was about 350 feet from the ground ,when it started to pull up while spinning twice it then quietened down and flew off into the clouds/ distance it was about the size of a normal rocket jet but was more of an equalateral triangle and was a dark black colour.