Helicopter Aerodynamics - Airflow through a Rotor Disk

Shows airflow down through the rotor system during normal thrusting state, Vortex ring state, autorotative state, and the windmill break state. Several of these are present during Settling with Power.

Category:

People & Blogs

Tags:

• SWP
• settling with power
• vortex ring state
• autorotative state
• windmill brake state
• autorotation

[MrBraden007]

perhaps some audio might help.

having more than one stimuli often helps retention of information in many people. Also makes for more enjoyable veiwing.

thanks for posting, look forward to seeing more.

[burgesco1]

@MrBraden007

Good idea. Although I have many instructors who use these videos to teach from and it allows them to discuss as it plays.

[burgesco1]

Kind of a misnomer. Windmill Brake state is more aligned with the end of an autorotation. I suppose if you did nothing to recover from the Settling with Power condition that you would pass through the Autorotative State and so on.

Really this gets to the static airflow sequences through a rotor disk from and much of it is concentrated with SWP.

[ToWi1989]

@burgesco1

MUTE? /facepalm

[MrBraden007]

@burgesco1 oh ok, they could mute the sound?

[burgesco1]

@joseppi2219

All aircraft designs mean there will be some differences in how it reacts or how the pilot should react as well. In general, this provides a basis for further detailed discussion for particular situations as you show below.

[joseppi2219]

In an autorotative state, the collective must be lowered to "flatten out" the blades, thus allowing them to be Driven by the upward flow of air aka Autorotation. Opposite of settling with power, where you would have pitch still in the equation. If you didnt take pitch out of blades in an auto, you would lose all inertia in the system and the blades would stop spinning due to drag

[joseppi2219]

actually seems as though the description or illustration is a great one to show SWP, but the explanations are not entirely accurate. Not far off but not accurate. SWP happens when you have 3 things, High decent rate, All or some power (and pitch to blades trying to produce lift) and finally, under ETL or effective translational lift a.k.a. no lateral airspeed

[KALEIDOSCOPEN]

it's a workout

[7sinbad7]

@toddj8633  Not at all impossible! Just STOP the vid using the 'start/stop' button on the left of the control ribbon. If needed, position the cursor at about 1:35, click to run from there, and 'stop' immediately the last pop-up paragraph appears on screen.

Simples!

[ThaisBlackXboxLive]

Lol, just when I watched this video.. A helicopter flies over my house..