Questions tagged [jet]
*Jet* is a generic, informal term for an aircraft with jet propulsion. In a civilian context it may refer to an airliner or small private jet.
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Why do jet nozzles close at different rates?
After recently seeing the trailer for Top Gun 2, I was reminded of something that I always wondered about: why do the nozzles of some jet aircraft seem to close at different rates?
Sure, it's likely ...
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4answers
318 views
How to start up a Lockwood-Hiller Valveless Pulse Jet?
So me and my group mates in university got a lockwood hiller valveless pulsejet manufactured, and there was one error in manufacture. We are having trouble with trying to start the engine as ...
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1answer
71 views
Is there an equation for jet engine efficiency as a function of turbine inlet temperature?
I know that there is a relation between the turbine inlet temperature and the engine's efficiency. But, can anyone provide an equation or efficiency as a function of just the turbine inlet temperature?...
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3answers
213 views
Why are the first sounds of an approaching enroute airliner low frequency, booming ones?
Often I will hear an intermittent, low frequency, powerful, booming sound that resolves into that of an airliner flying enroute high (FL 300+) overhead. So the first sounds that an airliner flying ...
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1answer
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Why is this missile positioned in this odd position? How can it be launched correctly?
How this missile is positioned here in this odd position? How this can be launched right from this jet?
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what is the physical explanation for additive drag?
from what i understand, additive drag is not really drag. it is a way to account for the variation of inlet condition due to conservation of mass.
but i still don't get why it create drag(negative ...
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2answers
91 views
How can the effects of hot corrosion and salt deposits from sea water spray in gas turbine engines be negated/prevented?
In aircraft operating in a maritime environment, corrosive effects from salt water are common. Are there any specific coatings used in engines for such aircraft? If so, which are they? How frequently ...
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1answer
269 views
What do those writings mean that are on the landing gear doors?
I've been watching carrier videos a lot these days and I notice these writings. What do these writings means? I didn't upload all of them, most of the time there are location names and sometimes ...
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3answers
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What kind of jet plane is this?
The cockpit can hold one person, is smaller than a compact car and as narrow as a motorcycle. What kind of plane is this and how hard would it be to fly?
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1answer
79 views
Is it possible to obtain an STC for single-pilot ops in a jet certified for two pilots?
I have been doing research on whether or not one could realistically obtain an STC for a super-midsize jet certified for two pilots and legally fly it single-pilot.
For reference, my chosen aircraft ...
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1answer
71 views
Does the canard config have radically different controls than classic config?
Classic configuration is something like the A320: wings in the middle, horizontal stabilizers at the tail.
Canard configuration is something like the Beechcraft Starship: wings at the back and ...
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3answers
224 views
Could wing tilting be a mechanism for VTOL and high angle of attack for jetliners? [closed]
My question is about turbofan airliners, could an airplane tilt its wings 90 degrees so that the fuselage horizontal axis is perpendicular to the longitudinal axis of the turbo fan. This way an ...
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Does/Can combustion instabilities occur in SCRAM jet?
I was told that combustion occurs at Supersonic speeds in SCRAM jet. So acoustic disturbances/ pressure fluctuations can't travel into incoming jet stream. Does this avoids combustion instabilities in ...
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2answers
909 views
How much does it cost to lease a jetliner?
As the title says, how much would it cost to lease a airplane for an airline. Let's say a B737 and a B747 or similar aircraft.
I tried to contact several aircraft leasing companies but so far I've ...
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1answer
132 views
What is the lightest jetliner out there?
What is the lightest commercial jetliner out there? I was thinking of something like a Embraer E170.
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0answers
41 views
Turbine engine combustion efficiency [duplicate]
What I read about combustion efficiency of jet engine is ratio of (Th-Tc)/ Th where Th combustion chamber temp and TC exhaust temp.
I also read this efficiency reduces with increase in altitude and ...
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1answer
168 views
Can the maximum thrust of a turbofan engine be estimated by its intake diameter?
I have no clue in aeronautics. How to estimate maximum thrust (at any rated condition, such as altitude, speed, rotation velocity- any given condition) by intake diameter?
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1answer
151 views
Are there reference speeds like V1, Vr or V2 for a touch and go procedure?
Are there any reference speeds like V1, Vr and V2 on a touch and go procedure?
During takeoff, these are used to mark certain states of the takeoff, including the speed at which the aircraft starts ...
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4answers
399 views
What are the advantages/disadvantages of in-fuselage engines (eg most fighter jets) vs wing/fuselage mounted engines?
Most modern jet fighter designs incorporate their engine(s) within the fuselage, while most other medium/large aircraft mount them either under the wings or on the rear fuselage.
What are the ...
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1answer
805 views
What is this yellow tube blowing air? [duplicate]
What is this yellow tube (lower right quadrant of the picture) which is blowing air into the airplane while it's at the terminal? You can see the open hatch on the bottom of the jet through which it's ...
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1answer
139 views
Who made the first high-wing jet airliner?
I thought the only high-wing jet airliners were made by the Soviets but the British Aerospace RJ-100 and Dash 6 series twizzled my mind.
So who made the first high-wing jet airliner?
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3answers
2k views
Are modern fighter jets bulletproof and armored?
Are modern fighter jets bulletproof and armored? One would not be wrong given part of their operations is being on the receiving end of enemy ammunition shooting at them.
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1answer
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Would it be possible to start a modern airliner from cold & dark during flight? [closed]
Imagine a suicidal pilot or disturbed passenger who gets access to cockpit, messes with the buttons. He shuts down engines, IRS, and battery, it's the middle of the night at cruise altitude.
Would it ...
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79 views
Are there any feasibility studies or research regarding the possibility of using Jet A in tropical countries?
Based on the ASTM D1655 standard specification for turbine fuels, the only difference between Jet A and Jet A-1 is the freezing point. Max [min?] -40 degrees Celsius (-40° F) for Jet A and max -47 ...
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1answer
456 views
Is there a significant difference between the jet blast from Airbus and Boeing?
I am looking up for jet blast data and there are not much information in the net.
One of the main references I can found are the Airport Planning of each aircraft.
From these can be obtained that the ...
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2answers
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How do they fill fuel in big aircraft?
Being a passenger, I usually will have view from only one side of these planes and hence don't know if same thing is happening on other side of the plane. I have observed hoses connected to wings, but ...
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1answer
2k views
Are turboprops less safe then jets?
On a recent trip to an airport, I noticed a large number of Bombardier Dash 8s. I wanted to know - are turboprops less safe than traditional jets like the 737 or A320? For instance, I would imagine ...
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2answers
353 views
What is the cheapest plane one can buy to fly above Mach 1 and be able to pull 8g plus?
Which plane would you suggest for someone who would like to be able to fly fast enough to break the sound barrier, yet also be able to pull lots of Gs?
What would be the price of such a plane, and ...
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3answers
607 views
Why does load shedding still occur in jetliners (e.g., 787) when there is so much power available?
I had a few questions about how electrical generator works on an aircraft, the 787 to be specific although I know it is similar for all aircraft.
So the 787 engines have 2 VFSG each which are rated ...
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1answer
595 views
Is there an aircraft that can go supersonic at sea level without using afterburner?
Is there an aircraft that can go supersonic at sea level without using afterburner? Quick look through the "supercruise" capable aircraft might be helpful in narrowing down the possibilities, though I ...
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1answer
224 views
How does Boeing Deliver single aisle jets to South east Asia? [duplicate]
I am not sure if they can fly on full tank gas to their destination (say India or Thailand), but how does Boeing deliver single aisle jets to these destinations. I read somewhere about the process of ...
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1answer
516 views
What kind of jet fighter is this?
I visisited Tirana, Albania the first week in August. Outside a shopping mall called "TEG" there was an old jet fighter on display. I can't recognise what make and model this is. Can anybody here help ...
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367 views
Is it possible to power a very small jet using batteries? [duplicate]
I have read a lot of answers on batteries powering large commercial jets, and how it won't work. However, for a small jet like the Honda jet, would it be possible for it to be powered completely by ...
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353 views
How significant is the lift induced drag contribution to total drag of aircraft at cruise speed?
How significant is the lift induced drag contribution to total drag of aircraft at cruise speed? From what I've learned so far it seems to be around 10 to 15 percent of total drag. I suspect the ratio ...
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4answers
1k views
What drives the shape of an engine's intake on a fighter jet?
Rectangular intakes have more corners which might increase subsonic pressure losses and would weigh larger than a pitot (Semi-circular) type intake. Are the designer drivers solely based on supersonic ...
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2answers
2k views
Why does the diffuser section generate thrust in a jet engine?
I am studying the thrust distribution of jet engines.
But I'm now a bit confused.
In Rolls-Royce's "The Jet Engine" book,
http://aeromodelbasic.blogspot.com/2012/05/thrust-distribution-distribution-...
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2answers
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What is the horizontal stabilizer failure procedure?
During the final flight of Alaska Airlines Flight 261:
The CVR transcript reveals the pilots' continuous attempts for the duration of the dive to regain control of the aircraft. At one point, ...
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2answers
980 views
Why is there still a preference for turboprop airliners over the new regional jets? [duplicate]
In the 1950s and in the early 1960s, jets were mostly available as fighter/military or big, long haul aircraft. Regional aviation was based primarily on piston aircraft that could operate in smaller ...
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Why didn't early jetliners use turbofans?
For subsonic operation, high-bypass turbofans seem to have essentially only advantages for efficiency, noise and takeoff thrust, at least until they reach the size where ground clearance or LP/fan ...
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1answer
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What is this aircraft seen at Peachtree City, GA?
Sorry for the poor quality, but this jet was taking off from Peachtree City Regional on Sunday 13 May. Anyone know the aircraft?
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1answer
1k views
Is military grade jet fuel more expensive than civilian grade?
Is military grade jet fuel more expensive than civilian grade?
Why are governments moving away from military grade jet fuels?
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344 views
Is making faster military fighters even practical?
I was curious after reading a book on Cold War plane development about the Soviet ideology of making increasingly powerful jets that could break Mach 3 and so on. With the advent of BVRAAM's such as ...
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2answers
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How are military jets given official names?
How is a military jet given a nickname? Does the manufacturer name the plane? For example, did Lockheed Martin name the Raptor (F-22) and Lightning II (F-35)?
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1answer
353 views
How does jet training work for private pilots? Are there jet trainers?
For a private pilot (not an ATP) that wants to get ratings for jets, how does that work?
What kind of training aircraft is used typically?
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1answer
145 views
What type of batteries are used in airline planes? [closed]
In Embraer 145 and Boeing 777
I mean material, recharge cycle, nominal current and voltages. From the comments I don't understand the difference if the plane is turboprop or turbofan.
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2answers
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What is the typical voltage used on jet airliners?
I have seen several parts that use 28 Volts DC, is this a standard for jet airliners (e.g., Airbuses and Boeings).
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What is the lightest weight operational jet/turboprop fighter ever deployed in combat?
Since the beginning of WWII there was been a trend towards larger fighter aircraft. In about 1960 the United States continued with larger fighters (F4, F100, F111, F15) but also started a branch of ...
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3answers
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What fighters have both 1 & 2 engine versions?
Northrop originally built the F-5 "Freedom Fighter" (and T-38 "Talon") with two engines. Later it was re-fitted with a single F404 engine from the F/A-18, re-designating it the F-20 "Tigershark" to ...
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1answer
208 views
Are there any calculations involved for designing pulse jets? [closed]
Are there any requirements for calculations to determine things like exhaust length, combustion chamber size, etc? Also, does the end of the combustion chamber need to be a semi-sphere, or can it be ...
