3 ms·
Why would the Ran Air Turbine be time restricted? As long as the plane is moving there’s power.
by mulmen 2y ago
Why would the Ran Air Turbine be time restricted? As long as the plane is moving there’s power.
- logifail 2y ago> Why would the Ran Air Turbine be time restricted? Gravity?
- mulmen 2y agoBut the turbine generates power to keep the plane flying. Why would it only work for 10 minutes? Certainly the flight time is a product of fuel level and altitude. Even if both engines fail the flight time would be a function of altitude. I don’t see how deployment of the RAT informs flight time.
- reportgunner 2y agoIf the RAT could keep the plane flying indefinitely we would just be using RAT instead of fuel I suppose.
- DiggyJohnson 2y ago/s? A generator or alternator powered directly by the engines is more efficient than towing a wind vane (still indirectly powered by the engines and/or the potential energy of the airplane) every single time. This discussion has nothing to do with engine out failure modes.
- JumpCrisscross 2y ago> This discussion has nothing to do with engine out failure modes. The 787's APU is not intended to run during flight. If it's running, you're in an engines-out scenario.
- mulmen 2y agoHuh? It’s a generator. It generates minimum power to keep the flight controls and instruments working. It’s not propulsion.
- mrguyorama 2y agoBy definition, when you are using the RAT, you don't have any electrical power and you probably don't have thrust. You are constrained by battery, airspeed, and altitude.
- mulmen 2y agoWell you aren’t constrained by battery if the RAT is deployed, that’s the point of the RAT. “Probably” is doing a lot of work here, there could be a power failure without engine failure.
- delfinom 2y agoThe RAT is a generator, not a device that can provide thrust. If anything it will minutely slow the plane down.