Dynamic, Ram, and Impact Air Pressure?

CLR4ILS

CLR4ILS

Well-Known Member
Please correct me if I am wrong...Dynamic, Ram, and Impact pressure all mean the same thing right? Dynamic means changing or moving. Ram and Impact obviously mean how they sound. I do not remember hearing pitot pressure being referred to as "Dynamic" in the early training. The IFH does not mention dynamic but the Jepp refers to all three as the same.

Just curious...ILS
 
Yep, it's all the same, just different communites use the different terms...

You usually hear it in aviation as "Ram and Impact ", the science community usually uses "Dynamic"...
 
Grabo172,
I received this response on ILSAPPROACH.COM. Sorry Doug, we love you man, but sometimes we have to surf...
tongue.gif


[ QUOTE ]
The way I came to understand it is as follows:

Static is the ambient pressure at a given altitude.

Ram and impact are the same; they are the pressure that hit the airplane. Used with temperature as well, as in "ram air temperature." On light and slow airplanes you won't see a difference, but the faster you go, ram air temperature increases due to friction.

Dynamic pressure is the pressure that is sensed inside the pitot tube and equals impact plus static. As you climb, static pressure decreases and so does dynamic. That explains why a pitot tube with both the ram and drain holes clogged acts like an altimeter.

Hope that helps.

E.D.


[/ QUOTE ]

Grabo, what do you think about Ed's response? My wife is a Applied Physics and Math Major. All she said was...Dynamic means moving and/or changing.

Sounds good to me...ILS
 
I think EDs response it pretty good...

Total pressure= Dynamic Pressure + Static Pressure

A Pitot Tube measures Total Pressure and the Static Port obviously measures Static Pressure... the Airspeed Indicator takes these two pressures and mechanically subtracts Static Pressure from Total Pressure to leave Dynamic Pressure which is calibrated on the gage face, displayed as an Airspeed...

Dynamic Pressure=Total Pressure - Static Pressure

And he's also right, that these terms can be used interchagably in light aitcraft due to the low airspeeds...
 
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