Kenny KellerCreator Helicopter Online Ground School LLC

Day #3 The Heli 3's Retreating Blade Stall Online Ground School

3 Jan 2012 · 1 min

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0:58

Kenny Keller explains retreating blade stall in helicopters: watch for abnormal vibration, nose pitch-up, and roll to the left. The nose pitch-up happens because of gyroscopic precession, a force on a spinning object that shows up 90 degrees later in the plane of rotation.

Questions this video answers

Abnormal vibration; pitch up of the nose; roll to the left.

Due to gyroscopic precession (a force applied to a spinning object is felt 90° later in the plane of rotation).

Chapters

Another memory aid for your checkride, the examiner is probably going to ask you what are the three things are you going to notice at the onset of retreating blade stall? The three things that you need to know are abnormal vibration, pitch up of the nose and a roll to the left. He's going to say, great. Why does the nose pitch up? The nose pitches up due to gyroscopic precession. What is gyroscopic precession? Well, maybe his next favorite question, gyroscopic precession is what you Gyroscopic precession is when a force is applied to a spinning object. It's felt 90 degrees later in the plane of rotation. So those are some of the key things there. At a private pilot checkride is one of the three things that you'll notice at the onset of retreating blade stall, abnormal vibration, pitch up of the nose and a roll to the left. So thanks for tuning in and we'll see you tomorrow. Thanks.