# All Questions

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60 views

### Why aren't air turborockets used in military fighters?

Why aren't air turborocket engines used in jet fighters? Few Third World countries have the capability to manufacture high quality turbine blades. Thus, why not use air turborocket engines for the ...
226 views

### What exactly is the pressure thrust component and why does it exist?

I'm teaching PowerPlants on a ATPL theory course and honestly have some trouble wrapping my head around this one: Most literature describes the term "pressure thrust" – as opposed to "...
2k views

### Why is the 777 fuel burn rate graph U shaped and skewed to the left?

I don't know math or physics. If I misuse terms, just edit my post, thanks! Presuppose a normal uneventful flight, such that as the plane climbs and cruises, the pilot reduces engine thrust to 69%-...
2k views

### What is that airport equipment that looks like an SMR but rotates like a windmill?

— YouTube The one rotating horizontally looks like a standard Surface Movement Radar (SMR). But the one next it, rotating vertically (like a windmill or wind turbine), what is that? Wouldn't that be ...
212 views

### Why do fighters not use thrust burst from under the wings for improved maneuvering?

This is just a postulation upon a few thoughts. I think it is intuitive to understand that in fighter jets, in a dog-fight scenario, higher turning speed, as in closing the angle between the chasing ...
192 views

### What is the metal sheet in front of the engine called on a Cessna 182 or similar?

I need to know the name of that metal sheet covering the front of the engine in small Cessnas (specifically the Cessna 182), just behind the propeller. I mean the one where the cowl plugs are put into:...
899 views

### What does the sound and flashing button indicate during this landing?

What does the sound in this YouTube video indicate? It is accompanied by a flashing button. Does that sound indicate the touchdown of both the main and nose landing gear? The pilot also pressed the ...
858 views

### Which popular turboprop engine feathers its propeller blades with each shutdown?

Chapter 12 of the FAA Airplane Flying Handbook, discussing multiengine flying, goes into quite a bit of detail in the propeller section about how most feathering-propeller-equipped engines on ...
96 views

### Why do fixed slats have a cusp?

Reading this about slat cove filler meant to reduce aeroacoustic noise, it seems there is no big difference in lift if the cove filler is deployed or not. I understand the shape of a retractable slat ...
87 views

### Aircraft of Elmer Wells at Barker Airfield, Toronto [closed]

I am trying to identify the aircraft in a picture of my Dad with his airplane at Marion Orr's Barker Airfield, Toronto, dated 1948. Having trouble adding pic to this site but someone may remember him....
2k views

### What is the vertical rod on this Swissair DC-3 drawing?

What is this large protruding rod in the frontal dorsal section of this drawing of a Swissair DC-3: The small rod extending from the nose I am assuming holds the pitot tube and serves as a mount for ...
277 views

### When pitching, how do planes establish a pitch rate which corresponds to the centripetal acceleration?

Coordinated flight requires that the yaw rate and the centripetal acceleration correspond. In other words, for a given $a_{centripetal} = v^2/r = \omega ^2 r$ this means that the yaw rate must equal \$\...
130 views

### What propeller for flying slow and efficiently? [closed]

So I'm getting into R/C flying and got myself a nice, but pre-owned trainer model. One of the things that need replacing is the propeller, which is a 2-blade nylon 10x8 with too many signs of damage ...
6k views

### Is this aerodynamic braking procedure normal in a 747?

I found this instagram video via YouTube: The description in the YouTube video states that: This aerodynamic baking procedure is applied to reduce wheel brake and engine wear I have two questions: ...
85 views

### Is the Special Traffic Management Program (STMP) still in use?

I'm doing some research on STMP. this NBAA link say that STMP is gone. however, this link makes it look like STMP was in use for oshkosh 2021. the subdomain may indicate it wasn't used though so it's ...
58 views

### What are the effects of increasing Wing Aspect Ratio?

I can think of only 2 effects that is The Induced Dag would Reduce with increasing AR of wing. This goes by the simple formula: $$C_{d(i)} = \frac{K \times C_l^2}{\pi \times \text{AR}}$$ As drag ...
330 views

### Which airplane is visually crossing the path of the descending Dragon spacecraft on Sept. 18, 2021?

In the recording of the SpaceX live-stream covering the return of the Inspiration4 crew in the Dragon spacecraft one can see an aircraft visually cross path with the capsule at 22:59:58. While the ...
168 views

### Charger vs Bronco horizontal stabilizer volume?

While watching this video on the Convair Model 48 Charger, I was surprised by the dimensions of the horizontal stabilizer. Compared to the North American OV-10 Bronco, which is relatively similar in ...
185 views

### What can be done when the magnetic compass breaks during a cross country flight? [closed]

On United state a VFR cross country flight, after arriving you discover that the magnetic compass has leaked all of the fluid and is inoperative. The weather at airport shows a fast moving cold front ...
154 views

### Why in a CFM56-3 is vibration measured in displacement for N1 and in velocity for N2?

N1 is measured in mils (thousandth of an inch) and N2 is measured in IPS (inches per second). Why are different methods used?
124 views

### Can I fly a friend for money when holding a commercial pilot certificate? [duplicate]

You have a friend that has recently purchased a rare car. He has offered to pay you to fly him there and drop him off so he can drive the car back. Is this allowed if you hold a Commercial Pilot ...
116 views

### How does a C208B's climate control system that utilizes bleed air for cabin heat work?

I'm studying the systems on my first turbine-engine aircraft, specifically, a C208B. I know that there is "bleed air heat" that mixes with re-circulated cabin-air. I know that the bleed air ...
104 views

### How many FAA-Certified Flight Instructors Hold a Gold Seal?

About how many, and approximately what percent of the instructors who are certified under the FAA hold a gold seal on their CFI certificate? How many not including expired certificates capable of ...
2k views

### Can solo time be logged with a passenger?

Here's a very niche question. If someone were to have completed their recreational or sport pilot license and be actively pursuing their private pilot license, could flight time without an instructor ...
120 views

### Can aileron control maintain track in a single engine failure on a twin?

Let us say I am flying a twin-engine aircraft and I got a engine failure during cruise, without any control on rudder and use the ailerons only, can I still maintain the target track or heading? Will ...
71 views

### Good 3D Turbofan exploding model for education [closed]

Is there a good free (or payed) 3D model of turbofan engine that can be rotated, with exploding view, maybe some interactivity to show the name of the part etc. For educational purposes. Got an idea ...
114 views

### Does a converted aircraft require recertification? Does it break manufacturer rights?

Here is a very interesting video shows how an Airbus A330 is converted from passenger plane to a cargo plane. There are lots of changes or modifications were made to the airplane to fit the new ...
146 views

### What is the ridge on the bottom of the wing on the Opener Blackfly? Is it a wing with a permanent kink? [closed]

What is the roughly 2" high ridge on the bottom of the trailing edge of wing on the Opener Blackfly? It looks like a full span flap, but I thought Blackfly's don't have any flaps? It is not on ...
116 views

### What is the maximum control surfaces deflection on a Cessna 210N?

Does someone know how far the control surfaces (rudder, ailerons, elevator and nose gear) can deflect in a Cessna 210N? I've been searching Google and the POH for hours now and can't find it.
81 views

### Can I fly an RNAV DP (GPS & RNAV 1 required) with no FD/AP?

I’m currently planning an instrument flight which includes a full stop at an airport with a RNAV (Obstacle) Departure Procedure. The procedure plate requires RNAV 1 and GPS. In ground school I ...
185 views

### How many degrees deviation from the defined final course can I have to start the descent?

To do a VOR, ILS or RNP approach, I am turning to establish the final approach course. The approach chart shows I should descend to a lower altitude for intercepting the final descent path. So, my ...
1k views

### What does the term "Thru Pax" mean?

I am trying to find the meaning for a group of words used by professionals in the airline industry and this was one of them.
186 views

### What does account for a high coffin corner of a plane?

The Coffin corner is the altitude at which a plane's stall speed is close to Mach 1, the speed of sound (but still below, at the critical Mach number). What accounts for a coffin corner at higher ...
329 views

### Why are gliders oftentimes not equipped with a transponder?

Oftentimes gliders are not equipped with transponders (at least in Europe). Even if they are, they do not necessarily operate it at all times. This is allowed by SERA.13001: (a) When an aircraft ...
82 views

### How does the stick force and behaviour of aircraft relate to the CG locations?

I'm struggling with developing an intuition for flight behaviour and stick force with CG locations. Assuming conventional wing and tail configuration, When the CG is moved from aft to forward, the ...
59 views

### How to calculate how much horsepower is needed to negate wing tip vortices with a wing tip prop?

How to calculate how much horsepower is needed to negate wing tip vortices with a wing tip prop? I understand 80% of drag is at the wing tips. Source: Xflaero software notes. I understand NASA's X-57 ...
233 views

### Is NASA's X-57 using a fan, a prop, or a prop/fan and what is the difference visually/physically?

Is the NASA's X-57 or the Opener BlackFly using a fan, a prop, or a prop/fan and what is the difference visually/physically? NASA X-57 Maxwell, courtesy of Wikipedia Opener BlackFly v3 courtesy of the ...
248 views

### Can pretty much anyone run/operate a primary radar? [closed]

Thinking about increasing the amount of information one receives beyond that from one's own 1090 MHz ADS-B in receiver when following aircraft as a hobby, is it perceivable and possible to operate a ...
3k views

### Are there any gliders that can fly over the Himalayas?

Do gliders (sailplanes) use ridge and wave lift in the Himalayas to go to extreme altitudes, possibly above Everest's peak?
710 views

### With a separation of 1000 feet, in flight is there any danger of severe wake turbulence?

Air Canada Flight 190 at 36600 experienced severe wake turbulence due to a Boeing 747-400 United 896 Flight at 37000. Assume the worst possible combination of civilian aircraft under standard speeds ...
7k views

### Why did my plane descend nose down?

I was on a flight recently and the plane started to descend normally etc. However one cabin crew member randomly announced "remember if we have an emergency landing please leave all your ...
293 views

### Countermeasures taken to prevent reverse engineering of military fighter jet technology? [closed]

Inspired from this news - The immediate question after reading the news will arose in the minds of novice people like me that - How the aircraft manufacturers cope with this issue? Which leads to ...
98 views

### Do aircraft usually fly with CG at 50 percent of chord or do I need to reduce the tail volume?

I'm working on a design having a 3.2-metre wing with a constant chord section in the middle and taper on the sides. With a tail volume of about 0.68, the neutral point is at 60% chord from the leading ...
1k views

### What does a High Pressure Turbine Clearance Control do?

In CFM56, I read that it is supposed to increase HPT performance but I don't know how it does that.
639 views

### Why do we calculate 25% more of TODR?

In general aviation aircraft, we are being told to calculate TODR (takeoff distance required) using AFM and TODR x 1.25. Why do we need the value with 25% added?
6k views

### Why aren't takeoff flaps used all the way up to cruise altitude?

In general aviation aircraft such as Diamond star DA-40, flaps to take-off are used until 500ft AGL and speed before retracting flaps is Vy (best ROC speed)-67kts and after retracting flaps is 80kts. ...
147 views

### Why would control-surface balance horns cause problems at transonic speeds?

On many aircraft, control surfaces such as elevators, ailerons, rudders, etc., have "horns" which extend forwards of the surface's hingeline, wrapping around the tip of the wing or ...
68 views

### BHP increases with Altitude

Searching on internet, I found some performance charts of the Merlin Engine BHP output: As you can see there is an increase in BHP,(mainting a constant Boost Setting), until reaching the critical ...