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39 votes

Why do missiles typically have cylindrical fuselage and not a fuselage that generates more lift?

Rockets with solid fuel must be round, or they would weigh more. Remember that the rear part is filled with fuel which gradually burns away, so the whole fuel container has to withstand the pressure ...
Peter Kämpf's user avatar
37 votes
Accepted

How do jet engines generate electrical power?

All jets and turbofans run a gearbox driven off the outer spool shaft. The gearbox has drive pads for all of the powered accessories like hydraulic pumps, fuel pumps, and the generator, and an input ...
John K's user avatar
  • 132k
25 votes

Can an aircraft use ram air to generate power while flying?

No, because large intake ducts would greatly increase drag. The propulsion system moves the aircraft, so you are only indirectly and inefficiently drawing power from the engine/aircraft instead of ...
Robert DiGiovanni's user avatar
25 votes

Can an aircraft use ram air to generate power while flying?

opening large air intakes... These would guide air... that will spin a turbine that spins a generator. You basically want to install a "ducted wind turbine" in the airplane. Off the top of ...
sophit's user avatar
  • 13.6k
16 votes

Why do missiles typically have cylindrical fuselage and not a fuselage that generates more lift?

There are several reasons why most missiles have a round shape. I try to list (some of them) in roughly ascending order of importance: Round shapes with wings are easy to calculate: Well known rough ...
U_flow's user avatar
  • 3,840
14 votes

Is the APU classified as a component of Airframe or Powerplant?

I was a tech writer in another life. Under ATA100/2100, the Air Transport Association system of categorization of systems for maintenance manuals, the APU is Chapter 49 (Airborne Auxiliary Power). ...
John K's user avatar
  • 132k
12 votes

Can an aircraft use ram air to generate power while flying?

Small antique aircraft which did not possess electrical systems originally do this already: on the bottom of the fuselage the owner can mount a little "windmill" propeller connected to a ...
niels nielsen's user avatar
11 votes

How do jet engines generate electrical power?

There are in fact at least three (I say that because I know of 3, and there could be more) different methods used. So to say “all aircraft” is not quite right. Lets start with what I think is the ...
AerospaceDoctor's user avatar
9 votes

How do jet engines generate electrical power?

It wasn't exactly a wind turbine, but the older model C-130's had an "Air Turbine Motor" which did exactly what the OP's 3rd point suggests, extracting the energy from bleed air to power a ...
Ralph J's user avatar
  • 51.8k
8 votes

Why do missiles typically have cylindrical fuselage and not a fuselage that generates more lift?

And some missiles are NOT cylindrical. Here, 6x AGM-86 ALCM (Air Launched Cruise Missile) on a B-52 left wing pylon. photo courtesy of NARA - https://nara.getarchive.net/media/technicians-check-the-...
WPNSGuy's user avatar
  • 9,077
8 votes

Are rotary engines the same as piston engines?

You are describing a Wankel type engine, which is not a piston engine, but is a type of 4 stroke "otto cycle" engine. They have been around since forever (the 60s), and would seem to be ...
John K's user avatar
  • 132k
8 votes

Can an aircraft use ram air to generate power while flying?

Today's airliners have a small emergency generator that is airflow driven. It pops into action automatically when the last of the powerplants fails. This electicity is needed to operate the ...
Walter Mitty's user avatar
8 votes

Can an aircraft use ram air to generate power while flying?

It's an over-unity/"perpetual motion" myth Something you regularly have to confront as a starting engineer. Sort of like putting a windmill on an electric car to generate power to recharge ...
Harper - Reinstate Monica's user avatar
7 votes

Can both AC ground and DC ground connect to the same Ground STUD

I am assuming you are referring to whether or not it is acceptable to connect the ground side of an AC supply and a DC supply to a common ground stud on the airframe. According to the FAA's Aircraft ...
Saxon Xander's user avatar
7 votes
Accepted

For pilots, are the procedures different between airframes with different engine options?

I can only speak for the Boeing B787, but the 787 Flight Crew Operating Manual (FCOM) indicates that there are slight differences between different engine options. Three examples: autostart modes (...
Stefan's user avatar
  • 4,692
6 votes

What would be the power requirements and performance of a Scroggs-type delta-wing aircraft with a 250 cm span?

First, thank you for unearthing this unorthodox design! However, it shows that paper airplanes don't scale well. Nevertheless, it follows the same laws of physics, so the same equations should apply ...
Peter Kämpf's user avatar
5 votes

Are rotary engines the same as piston engines?

Although the Wankel engine is commonly called a rotary engine, in the early days of aviation, there was a rotary engine (which was a piston engine) that shared a lot of characteristics with a radial ...
RetiredATC's user avatar
  • 1,954
5 votes

Is the APU classified as a component of Airframe or Powerplant?

In the U.S., auxiliary power units are categorized under Powerplant for the purposes of maintenance. The FAA Aviation Maintenance Technician Handbook - Powerplant, Volume 1 lists auxiliary power units ...
Aaron Holmes's user avatar
  • 4,847
4 votes
Accepted

Hydromechanical/Electronic fuel control system

I can give you a generalized answer and most of the details you are looking for are hopefully buried here. You can think of it as 3 broad categories or generations of engine fuel control. First was ...
John K's user avatar
  • 132k
4 votes

Can an aircraft use ram air to generate power while flying?

Yes. Early F-4 aircraft had Ram Air Turbines, (we called them RATs), that provided emergency electrical and hydraulic power in the event of system failures. They were small propellor driven hydraulic ...
Charles Bretana's user avatar
4 votes

Why does an aircraft require less power when it is flying slower than the most efficient speed?

There are two ways to look at efficiency of flight, and it depends on the objective of the flight which type off efficiency is applicable. If the objective is to stay airborne as long as possible, we ...
DeltaLima's user avatar
  • 83.6k
3 votes

How do jet engines generate electrical power?

Many aircraft engines has an axillary gear drive shaft to a hydraulic constant speed drive or CSD. The CSD input can be a fairly wide range of RPM. the output is constant. It turns a generator at a ...
Jim's user avatar
  • 1,176
3 votes
Accepted

Is an aircraft considered experimental if built when having A&P licence?

Yes, even if you are a certified A&P, any aircraft you build from scratch or a kit is considered an "amateur built" experimental. Even long running kits like Vans RV series are ...
Ron Beyer's user avatar
  • 36.2k
3 votes
Accepted

Limits on piston-engine power for a given airframe?

It really depends on how long you want to fly for. Big engines generally require a lot of fuel so dropping a huge power plant on a small airframe may burn through all the fuel you can practically ...
Dave's user avatar
  • 101k
3 votes

Can an aircraft use ram air to generate power while flying?

The only situation where this could make sense is when the plane descends from travel altitude as some kind of recuperative "braking". But the weight of the extra gear needed would make this ...
mow's user avatar
  • 31
3 votes

Can an aircraft use ram air to generate power while flying?

Here's a concept inspired by this related answer -- imagine an airplane that is essentially a sailplane with an electric motor for added assistance. Normally, once a sailplane has climbed to the top ...
quiet flyer's user avatar
  • 22.7k
3 votes

Can an aircraft use ram air to generate power while flying?

Yes. Ram Air Turbines (RATs) are very common in aviation for applications where equipment needs electrical or hydraulic power that aircraft engines cannot provide. The most common application of a ...
Romeo_4808N's user avatar
  • 74.1k
3 votes

What is the reason for aircraft AC power supply neutral wire not connected to chassis GND?

Electrical engineering question, but here is the idea. In short The usual earthing/grounding scheme used in large aircraft is TN-C. T indicates the source has its neutral connected to earth (ground). ...
mins's user avatar
  • 74.7k
2 votes

Why is the available power in propeller engine is almost constant for every velocity?

It is a gross simplification, assuming a constant speed prop. If a fixed pitch prop, it is non-linear. Even with a constant speed prop it is not exactly linear. Lesser factors for power available ...
mongo's user avatar
  • 17.8k
2 votes
Accepted

What priviliges and limitations does an Aircraft(General) mechanic have versus an A&P?

None. It is required to pass your written general to move on to obtain your Aiframe/Powerplant certification via an Oral & Practical exam. There is no general certification. If you're looking for ...
Dustin Cotten's user avatar

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