A Robinson R44 Helicopter

As I was taking pictures of the Leitch, I heard the sound of a helicopter.

It was a Robinson R44.  The Robinson R44 was developed from the R22.  It is a four seat helicopter (where the R22 is two).  It is powered by a Lycoming IO-540 engine which gives it 245 horsepower.  It has a top speed of 150 miles per hour.  It has been the best selling general aviation helicopter since 1999.  Since its introduction in 1993, over 5,800 have been produced.