Questions tagged [rat]

A ram air turbine (commonly known by the acronym RAT) is a small turbine that is connected to a hydraulic pump, or electrical generator, installed in an aircraft and used as a power source. The RAT generates power from the airstream by ram pressure due to the speed of the aircraft.

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8
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2answers
331 views

What was the first aircraft equipped with a RAT?

RAT are common in airliners today to provide emergency electrical and hydraulic power. Yet, firsts airliners (prior to WWII) may not require the same amount of power than today's airliners (which are ...
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3answers
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What role did the RAT (Ram Air Turbine) play on US Airways flight 1549?

An article in June 2018 Flying Magazine regarding the RAT by a Rob Mark explains that Capt. Sullunberger deployed the RAT for additional power to guide the plane down to the safe ditching on the ...
4
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1answer
464 views

How do pilots decide whether or not to deploy a ram air turbine?

Since the turbine needs to be deployed from within the aircraft to the outside, it will obviously induce aerodynamic drag (slowing the plane down?). I mean I remember reading an article where a plane ...
4
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1answer
450 views

What is the typical blade pitch angle of a ram air turbine?

I'm building a simple 3d model of one and because reasons I won't be able to give it a variable blade pitch so I need to find a typical value. My google-fu has failed me so far on this.
24
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1answer
12k views

Does a Boeing 737-800 Have a Ram Air Turbine (RAT)?

I am travelling with Thomson on a Boeing 737-800 and wondered if it had a RAT?
14
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1answer
4k views

Why would a RAT be deployed at takeoff?

(Source) Is that a Ram Air Turbine (RAT) on the port side below the wing? Why is it already deployed and spinning during takeoff? This answer mentions a minimum airspeed at which RAT can be deployed....
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2answers
617 views

Is the RAT pump on the A320 standard fitment or is it an “option”?

Is the RAT pump standard or optional on the A320 aircraft? What about the B737?
7
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3answers
906 views

What are the pros/cons of ram air turbines?

Commercial aircraft are equipped with ram air turbines that can be deploy to provide power in case all other sources of power are lost. Ram air turbines have the benefit of providing power as long as ...
6
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1answer
630 views

How much drag does a RAT deployment add?

How much drag does a RAT deployment add? I was watching a simulator video of an A320 dual engine failure at low height during climb out and one step in the protocol was the pilot manually deploying ...
11
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2answers
3k views

Is there a maximum airspeed to deploy a ram air turbine?

Is there any airspeed limit for deploying a ram air turbine? Can airspeed be determined from the rate of its propeller rotation? Could that data be used to determine altitude?
5
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1answer
3k views

How much power is generated by a Ram Air Turbine (RAT)?

For long range, wide body planes A380 and B777, what is the power generated by RAT (Ram Air Turbine)? And which all are the systems which the RAT drives?