Questions tagged [turboprop]

A turboprop engine is a type of turbine engine which drives an aircraft propeller to produce thrust (as opposed to a jet engine, where the turbine exhaust provides thrust directly).

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4
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1answer
526 views

What happens when changing the throttle on a PT-6 engine?

Imagine a PT-6 in cruise flight. What would pushing the throttle forward for increased power show on the engine instruments? We know (I assume!) the prop RPM remains constant by varying the pitch, but ...
16
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1answer
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How does a turboprop engine keep running during thrust reversal?

For thrust reversal after landing, a turboprop engine reverses blade pitch and blows air forward. But the engine itself requires air flow for the turbine. How can a turboprop engine keep running when ...
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1answer
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What are the differences between a helicopter engine (turboshaft) and an aircraft engine (turboprop)?

Given the fact that most helicopters nowadays use turbo shaft engines and many aeroplanes still use turboprop engines (which are essentially turbo shaft engines with a propeller), how do you ...
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Can these vortices be dangerous?

There is a question related to this one right here but I'm more interested in the danger of those vortices. Are they very dangerous to cause a wake turbulence for the aircraft that comes behind this? ...
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3answers
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What are the effects of an increase in altitude upon ESHP of a turboprop engine?

This is one of the questions in the ATP material: What effect will an increase in altitude have upon the available equivalent shaft horsepower (ESPH) of a turboprop engine? A) Lower air ...
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1answer
961 views

Is the Cirrus SR22T a turbo-prop? Or does in just have a turbocharger?

Is the Cirrus SR22T a turbo-prop? Or does in just have a turbocharger like in a car?
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1answer
240 views

Could low pressure compressor blades be made of aluminum?

With the compressor blades on a gas turbine, could the low pressure blades be made of aluminum, or would it be catastrophic? Edit: Like the 6061 alloy.
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1answer
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How much runway is needed for comfortable operations in a PC-9?

I am familiar with simple single engine props and twins and am thinking of moving up to turboprops like a Soccata TBM 700 or Pilatus PC-9. How much runway do aircraft like these need to operate ...
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3answers
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How is lift provided by a wing affected by propeller wake?

Does the lift of that section of the wing which is in the wake of the propeller increase (because the airspeed in that section is higher)? If yes, is this fact used actively to improve the lift ...
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2answers
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What is this on the starboard engine of the Dash 8?

On the inside of the starboard engine of the Bombardier Dash 8 Q400 there is a small aerofoil shaped object* protruding from the casing. There also appears to be pipes protruding from the end of it. ...
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2answers
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Why is the compressed air (from engine compressors) taken from High Pressure (HP) stage instead of Low Pressure (LP) stage?

An aircraft that uses Turbofan or Turboprop engines would be taking the compressed air from 3rd stage and 6th stage (varies) and supplying it to the Pressurisation and Air Conditioning Kit (PACK). ...
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2answers
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Is turboshaft fuel efficiency affected by N2 loading?

When using a free power turbine turboshaft, does fuel burn get affected by N2 loading? I am asking as I want to in the future bench test a turboshaft for fuel burn, but I don't know if the loading ...
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1answer
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What is the purpose of a reverse-flow orientation for turbo-prop aircraft?

If I decide to utilize a PT6 (ignoring for now the cornucopia of variants) as the turbine engine I will be using on my newly designed turbo-prop aircraft, do I then decide how I will orient the engine ...
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3answers
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What happens when a turbo-prop is over-torqued?

What does one need to do when a turboprop engine gets over-torqued? I haven't over-torqued an engine before, but it seems it could happen inadvertently, say while doing a go-around. My questions ...
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How does the Pratt & Whitney Canada PT6 differ from other turboprop engines?

As far as I know, all turboprop engines have mechanical continuity between the engine and the propeller except for the Pratt & Whitney Canada PT6 family of engines. What is the correct term for ...
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Why are the top speeds for jet engines higher than for propellers?

I realize turbines are more efficient than piston engines, but if that were true, then why don't turbo-props reach jet speeds?
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1answer
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How does a turboprop engine work? [duplicate]

I don't understand how it works, can someone provide me with details?
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What does feathering mean and how does it work technically?

Before I ask "What does Feathering mean when it comes to Jet/Propeller Engines" I have to say what I think I know: Feathering jet/prop engines mean achieving a sufficient turbine rotation speed at ...
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1answer
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How does this fuel pump work?

This question is about the fuel pump controlled by the hydro-mechanical fuel control unit. This is part of a fuel system for a turboprop engine, described on this page which actually comes from a ...
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1answer
4k views

How do blade cuffs help cool the engine?

How does the blade cuff (a fairing of suitable airfoil shape used to cover the shanks of propeller blades in order to reduce the aerodynamic losses) help cool the engine?
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1answer
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What happens when a propeller is placed in beta while feathered?

Could someone explain beta range to me? What happens when we set the throttle control lever to the beta range (reverse thrust) while the propeller blades are in the feathered position? Will the ...
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1answer
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What is autofeather for?

What is autofeather and when is it used?
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1answer
932 views

Is there a modern single-seat turboprop?

There seem to be a number of tandem seat turboprop trainers like the PC-9/Texan and the Super Tucano. Are there any single-seat turboprops? I am asking about modern production planes.
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2answers
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Has the Beechcraft company considered building a single-engine turboprop?

I was passing a stack of magazines at a friend's office and I could have sworn I saw a cover article about a single-engine King Air. I went looking for that article and haven't been able to find it, ...
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Why does a turboprop lag?

Compared to a [modern] turbofan/turbojet, why is the throttle response slow in a turboprop? A constant speed propeller mounted on a piston engine responds much quicker. Is the underlying reason ...
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0answers
238 views

Twin otter engine starting procedure [duplicate]

Could you please give me the steps or procedure to start the a/c twin otter gas turbine engine?
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1answer
2k views

What is the highest service ceiling for turboprop airplane like a Cessna 425? [closed]

What is the highest service ceiling turboprop airplane, that is fairly small, like maximum of 8 seats, and fairly cheap as well, not going over a million dollars. I looked at Cessna 425, and this ...
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1answer
549 views

Why are 4 engine civilian turboprops not produced anymore [duplicate]

As per subject why are 4 engine turboprops not produced anymore for civilian flights if turboprops are so efficient? How comes the military still use them (see Airbus A400 and C130) It would be ...
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1answer
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Does the nose-up attitude of a jet make it more difficult to land than a turboprop?

Due to the more acute nose down attitude of a turboprop on approach, does this make it less difficult to control compared to the relatively high nose up attitude of a jet?
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1answer
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What does the condition lever in turboprops control?

Turbojet and turbofan engines have just one control lever that controls the thrust by setting the amount of fuel injected. But most turboprop aircraft have three levers. One adjusts the fuel flow, ...
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1answer
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Why don't airliners have turboprop engines instead of jet engines? [duplicate]

I know the q400 is one of few airliners that has a turboprop engines. I know that some military airplanes use turboprop engines so why don't many airliners use them?
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1answer
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Has a general aviation twin-engine turboprop with counter rotating propellors ever been built?

In my experience with general aviation twin-engine turboprops I've never heard of one with counter rotating propellors. I've never seen any data about an engine manufacturer building left-rotating ...
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1answer
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How do intake deflectors work?

Some turboprop aircraft, for example DHC 6 Twin Otter have “intake deflectors” which should be engaged when taking off from or landing on unpaved surface to prevent foreign object damage. But how does ...
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3answers
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What are the major hazards in operating a PT6 Turbine Engine?

I am just in the process of doing a bit of study in the hope of doing my Basic Gas Turbine Endorsement in the next few months, and just wanted some feedback/comments/discussion on the major hazards ...
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In turboprops, is there a mechanism to prevent the blades running in opposite direction?

Because, it might lead to reverse flow of air and could stall the plane. Is there some mechanism to prevent this? There was a crash in Ireland a few years ago, when the pilot of a small charter plane ...
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Do turboprop and piston engines perform differently at higher altitudes?

When flying at higher altitudes, does it matter if you have a turboprop vs a piston engine driving a propeller?
11
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1answer
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On a larger airplane, how do they manage balance?

I have flown a bunch of times on a Bombardier Dash-8 Q400 on a couple of different airlines, and several times I have flown a shuttle flight that is basically empty. I have been instructed to change ...

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