# Tag Info

Accepted

### How did the sailor survive getting sucked into an engine?

The A-6 intakes are not that large. He did not go all the way down the pipe, but instead got wedged in. The sparks and whatnot coming out the exhaust was due to his headgear getting sucked off, and ...
• 8,644

### What kind of combustor are these engines using?

This is a typical engine used where space is at a premium, that explains its particular layout. From left to right we find: An axial compressor with one single stage; this is used as the beginning of ...
• 11.9k

### How did the sailor survive getting sucked into an engine?

Image taken from here The reason that the petty officer survived is that the inlet duct is quite long (the whole body did not get sucked in, only from the waist up) and the engine stalled immediately ...
• 1,700

### How big would a single propeller need to be on a 737?

As usual, we can use the simple momentum theory to quickly estimate the thrust $T$ generated by a propeller: $T = \sqrt[3]{2 k \rho A P^2}$ where $A$ is the propeller area, $\rho$ is the density and ...
• 11.9k

### How diesel fuel is injected into the cylinder of a diesel engine?

The fuel is injected at the top of the compression stroke, timed as you would time the firing of a spark plug. The fuel starts to burn as soon as it atomizes in the combustion chamber due to the ...
• 131k

### PA28 Archer 2 Circa 1986 - Noisy Engine

The propeller beat frequency and the exhaust pulse frequency of a 4 cylinder engine are both about 60-80 hz. At 2300 RPM, 76.6 Hz to be precise. A booming noise is likely noise in that frequency range ...
• 131k

### How did the sailor survive getting sucked into an engine?

The issue is large pressure gradients around the engine inlet when the engine is operating at full power. These create ingestion dangers around the intake as far away as 15-20 ft directly in front of ...
• 73.7k

### 777-300ER venting something from left engine outboard side - what is it?

Well, it's not condensate water from the tail pipe, and it looks to be originating from the main cowl, so it can only be one of the Big Three fluids; fuel, engine oil, or hydraulic oil (for the ...
• 131k

### Need help identifying a radial aircraft engine

The Bristol Taurus, Pratt & Whitney R-1830, R-2000, and Wright R-2600 are twin-row 14-cylinder engines. Could you estimate the overall diameter of the engine? You can readily measure the bore -- ...
• 11.4k

### How would you know the difference between a compressor stall and a surge based on indications in the cockpit?

Stall and surge are two different, although related, physical phenomena. Stall: One or more blade stages exceed the critical AoA, the airflow is turbulent, and the smooth airflow through the ...
• 171
Accepted

### How is a turboprop engine mounted to the wing?

As usual an image is worth more than a thousand words (cutaway source): As visible, the engine is mounted enclosed inside a truss structure (composed for example by the beams 191 and 199) ...
• 11.9k

### How is a turboprop engine mounted to the wing?

A turboprop isn't really different from the answers given in the question you link to. There is typically a frame of tubes that hold the engine and take the loads back to the wing. The frame will ...
• 11.4k
Accepted

### Is diying a strong jet engine possible wih basic tools

This would require far, far more than just a lathe. You'll have to do 3D milling of some fairly exotic materials to create turbines, sophisticated spin balancing tools, etc. There's a DIY guy on ...
• 3,790
Accepted

### How diesel fuel is injected into the cylinder of a diesel engine?

maybe a gradual injection of fuel during the power stroke will be helpful That is correct. Modern diesel engines inject fuel gradually. The main purpose of this is to ensure a slower burn of the fuel ...
• 6,616

### Why was the Me 262's top speed at 6km?

It has to do with the engine design, as follows. The higher a plane flies, the faster it can go for the same engine power. This is because as the air thins out, drag decreases. However, as the air ...
• 21.1k

### How to calculate sfc per throttle setting of an turbofan engine?

My prior answer assumed you were looking at a piston engine. This answer will reflect your update to interest in a turbofan engine. You are interested in calculating the thrust hook (TSFC vs. Thrust ...
• 11.4k

### How/why does engine torque and horsepower affect aircraft speed?

Horsepower is what propels an airplane through the air; more horsepower means more speed. Power is neither torque nor RPM by itself: it is their product. (Torque)x(rpm)x(conversion factor) = ...
• 21.1k

### Is it possible to identify plane engines by sound alone?

Regarding only piston engines: with practice you can identify 4-cylinder engines, 6-cylinder engines, 2-blade props, 3-blade props, horizontally-opposed engines, and radial engines. There are certain ...
• 21.1k

### What kind of combustor are these engines using?

The combustor appears to bhe the orange part about 1/3 from the left. It is perforated. Flow exits the blue centrifugal compressor to the left and makes a 90 deg turn into the chamber surrounding the ...
• 11.4k

### Do military transport aircraft engines rely on the same supply chain as the civilian version?

Usually what you see is the "civilianized" version of the military engine has been modified to achieve cost improvements or maintainability improvements. For example, the military version ...
• 131k
1 vote

### How/why does engine torque and horsepower affect aircraft speed?

Horsepower and torque affects RPM. For a given torque, an aircraft needs greater RPM to achieve greater speed. And that means more horsepower. For a given RPM, an aircraft with a higher blade pitch ...
1 vote

### Manifold Pressure System

No. It's just a tap-in to the intake passage on the downstream side of the carb. It's just measuring the absolute pressure in the duct, which is always less than atmospheric in the absence of ...
• 131k
1 vote

### Could a F-22's exhaust stall a highjacked Boeing 767's turbofan(s) and force it to land?

Most likely, the answer is no As pointed out above, jet engines burn quite lean, so there are still is plenty of oxygen in the exhaust gases available for combustion. So much so that during the 1950s –...
• 73.7k
1 vote

### Is it possible to identify plane engines by sound alone?

I know that there is technology that analyzes the sound signature of submarines and traces their locations and what country they're made by, as designs differ between countries. I would assume that a ...
1 vote

### Is it possible to identify plane engines by sound alone?

To a certain extent, yes. As per your question, low and high bypass ratio engines are quitw easy to learn to tell apart. From close(ish) low bypass engines are stupid loud, and the sound spectrum is ...
• 28.7k
1 vote

### Authorization of repairing engine blade nicks

From 14 CFR 65.85, emphasis mine: Except as provided in paragraph (b) of this section, a certificated mechanic with a powerplant rating may approve and return to service a powerplant or propeller or ...
• 15.5k
1 vote

### twist correction of fan blades

Here is a way to grasp the subject. Imagine that with accumulated flight hours, the blades of (for example) the power turbine get asymmetrically eroded, resulting in a change in the effective "...
• 21.1k

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