Questions tagged [airframe-and-powerplant]

Commonly called A&P, a license granted by the FAA certifying a person is qualified to perform maintenance on an aircraft.

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Are UDF/Propfan Engines Thrust Producing or Power Producing? [duplicate]

For the purposes of aircraft performance (best endurance/range speeds, Vx, Vy, etc.) would a propfan be considered a power producing engine or a thrust producing engine? I would imagine it would be ...
Sauerkraut9's user avatar
3 votes
1 answer
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What is the reason for aircraft AC power supply neutral wire not connected to chassis GND?

In home utility power supply, AC neutral and earth GND are connected together at distribution transformer output. Is there a reason why aircraft power supply is not following the same practice? Why ...
Divya K.S's user avatar
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Humidity and its effect

We know that humidity degrades engine performance. Is there any charts or tables which quantify effect on engine performance due humidity? The question is specific to helicopters.
Vikas Singh's user avatar
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Are there equations to match power required to mass for rotorcraft?

Is there an equation (or table or whatever) to determine what power is required to fly certain mass? Probably there will be a bunch of nuances, but at least some sort of rule of thumb probably exists.
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Compressor variable geometry and Engine pressure ratio

I was wondering does a compressor variable geometry and a inlet variable stator vane share any similarities or does these terms have same meanings? I did some digging and all I could find is that CVG ...
Ludwig T's user avatar
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4 answers
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Why does an aircraft require less power when it is flying slower than the most efficient speed?

While I understand the derivation of Power required, I fail to understand why minimum power required corresponds to a velocity that is lower than velocity corresponding to minimum thrust required. My ...
Akshay Kashyap Panda's user avatar
9 votes
10 answers
7k views

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

I am a student carrying out a project focused on efficiency on aircraft. I have arrived at an idea I believe to be feasible. I am looking for suggestions, specification of what I would need, and any ...
Max Cremona's user avatar
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Can people perform major modifications to an aircraft without an A/P license, as long as their company is certified per part 145?

If a company is part 145 certified wanted to do a major modification, can they do so without having A/Ps? Or does an A/P need to be present to verify/sign off? or no A/P's need to be present? At that ...
0128Z's user avatar
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Why do missiles typically have cylindrical fuselage and not a fuselage that generates more lift?

For example, Tomahawk Cruise Missile, or Harpoon anti-ship missile. They fly straight and level for the most part of their flight regime. I think if they had a fuselage optimised for level flight then ...
Tony Stark's user avatar
21 votes
4 answers
7k views

How do jet engines generate electrical power?

I am interested in understanding how electric power is generated in Jet engines. If a pilot continuously keeps altering the throttle to suit the flight requirements, how does the jet engine maintain ...
Sohail Khan's user avatar
2 votes
1 answer
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Can I work civilian aircraft with just an FAA Airframe certificate?

I am currently in the Air force, but plan on separating after my contract ends. I really like the field of avionics and aviation in general.(I am a B-1 Offensive Avionics Systems guy) However, when I ...
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Is an aircraft considered experimental if built when having A&P licence?

I got my Airframe and Powerplant while in the Army 20 years ago, never used it after I got out. If I built an aircraft from scratch would it be considered amature experimental?
drhunn's user avatar
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Are rotary engines the same as piston engines?

I’m researching into piston engine powered, propeller driven aircraft. However, I’m really struggling to find manufacturers that make "piston engines". For example, I came across Rotron, but ...
Engine lover's user avatar
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3 answers
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Can both AC ground and DC ground connect to the same Ground STUD

Can both AC ground and DC ground connect to the same Ground STUD in a plane?
Bob's user avatar
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After completing my A&P are you suppose to get a temporary license? After the exam my DME just gave me a copy of my airmen certificate application

I passed my exams on 17DEC2020. Currently the FAA's web site shows that I have no certificates, and shows that they are processing applicants from 25JAN2021...... what should I do?
guy fox's user avatar
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Could a Combined Inverted Brayton Cycle and rankine cycle engine be used as a power source in a high altitude hybrid aircraft?

Combined Cycle Power Plant for Hybrid Aeroplane. Background Inverted Gas Turbine From the Institute of Combustion Technology - DLR MGT = Micro Gas Turbine IBC = Inverted Brayton Cycle In the inverse ...
Tobe's user avatar
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Is Ducted fan or Propeller better to maximize forward speed of RC aircraft with a given power?

I'm designing an RC aircraft of which the final goal is a crazy top speed. I'll be 3D printing and sanding / finishing the air frame surfaces to reduce drag. In order to achieve maximum top speed, ...
InsanitySquared's user avatar
5 votes
3 answers
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Is the APU classified as a component of Airframe or Powerplant?

In the classification of systems and components on the aircraft - is an APU classified under the Airframe or the Powerplant?
Jamiu NINIOLA's user avatar
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Can i get A&P course materials in .pdf format? [closed]

I would be very grateful if you provide me any material about A&P basic course for mechanics.
Hakimi's user avatar
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4 votes
0 answers
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What is Snowbird flapping mechanism?

Reading this question and the great answer to it talking about Snowbird sustained human powered flight visible here, I was wondering and still cannot find nor figure out how power is converted from ...
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1 vote
1 answer
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What priviliges and limitations does an Aircraft(General) mechanic have versus an A&P?

The FAA provides practical test standards for Airframe, Powerplant, and General mechanic certificates. Mechanics seem to demonstrate a preference for Airframe & Powerplant, so much that "A&P" ...
Steve V.'s user avatar
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Limits on piston-engine power for a given airframe?

I'm looking for an authorative textual source (and indeed any guidance would be useful) on the relationship bewteen a given airframe and the maximum power that it can realistically harness/cope with ...
J Bronk's user avatar
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1 answer
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Hydromechanical/Electronic fuel control system [closed]

Can someone explain the picture below which represents hydromechanical/electronic fuel control? What's the function of the solenoid on the picture below? What are the differences between solely ...
Darjan's user avatar
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3 votes
1 answer
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What would be the power requirements and performance of a Scroggs-type delta-wing aircraft with a 250 cm span?

Roy Scroggs, a tailor, patented in 1917, US1250033, and in 1932 US1848578, a Delta Wing plan form machine 'Flying Dart', flight tested with an OX-5 engine, they say ...
Urquiola's user avatar
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Hydro-pneumatic fuel controls and hydro-mechanical fuel controls

What are the advantages and disadvantages of the hydro-pneumatic controls against the hydro-mechanical controls?
beginner's user avatar
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0 answers
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Is it possible to swap RR trent 900 engines to GP 7200 for existing A380 air frame? [duplicate]

If an A380 was originally equiped with RR trent 900 engines, but decided to switch to GP 7200 for any reason, would this be possible? Has this kind of engine swap (different manufacturer engine swap) ...
Max Hong's user avatar
1 vote
3 answers
2k views

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

I surfed on the internet for an answer but I didn't find any. I'm taking Aircraft Performance course. I saw that available power for propeller engine is almost constant for every velocity. But I don'...
Volkan Aydıngül's user avatar
2 votes
0 answers
172 views

Where can one access the electrical buses in an aircraft? [closed]

I am looking at how new systems are retrofitted in aircrafts (large business jets or airliners), and I was wondering where the mechanics can get access to electrical power. More specifically, I know ...
Aerocurious's user avatar
7 votes
1 answer
273 views

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

Lets use the B757 as an example. Engine options are PW2000 and the RB211. As I'm sure they are both FADEC engines we don't have to worry about and mechanical linkages and such. But each engine ...
LuftBier's user avatar
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2 answers
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Is it possible to determine the mass flow rate through the engine of MiG-21 during its various cruise Mach no. operations?

Is it possible to obtain the mass flow through the Tumansky R-25 turbojet engine mounted on a MiG-21 during its various standard operating (cruise) Mach numbers? Note: standard as in older planes ...
Manish's user avatar
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Is there a niche market for A&P mechanics with an aerospace engineering degree?

I've noticed a few people posting on this site who I would guess are aerospace engineers. I am an A&P Mechanic, who is currently in the process of applying to college for an aerospace engineering ...
R2800's user avatar
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