Questions tagged [piston-engine]

Piston (reciprocating) aircraft engines are internal combustion engines, similar to the type found in most automobiles. They are typically gasoline powered.

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Why isn't Yamaha EPeX300Ti more popular in aviation?

The answer to this question might be obvious to experienced aviators. But as an armchair enthusiast, I really couldn't find a satisfactory answer anywhere on the internet. Below two pages came from ...
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What's the reason of engine roughness while leveling off from climb or recovering from stall?

I want to find out that if relative wind pressure can affect engine or not.
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Why does engine temperature rise upon applying carburetor heat?

When carb heat is applied, the mixture enriches due to hotter and less-dense air mixing with the fuel. But a richer mixture has the side effect of cooling the engine down. So why does carb heat cause ...
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Could a Continental R-670 piston engine run with regular car gasoline?

I know that the minimum octane for the R-670 is 65 octanes (W670-K variant). I also noticed that other variants increase compression ratio and power using a minimum of 80 octane. Why there is an ...
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static thrust vs. prop RPM data?

edit: question was too long, and is actually simple, so I removed unneccesary description Background: There are many questions here about: propeller efficiency changes to thrust when it is dynamic ...
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4 votes
1 answer
241 views

What happens if you change power setting with constant mixture setting?

For a given Cruise Setting: Manifold set / RPM set / Mixture set according to P.O.H. values: what happens to the Mixture if you were to reduce power or increase Power by varying throttle? Does a ...
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Propulsion/ power plant

Let’s say I require 100Hp as stated by my calculations of Thrust for an aircraft- When finding a power plant for this, would it be better to use a power plant with more Hp or exactly that 100Hp please?...
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Are these units correct for Hp/W

using the table provided, and how it says the Velocity should be in mph, is it correct to say that the units of Hp/W from this table is mph also?
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4 answers
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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 ...
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Why we turn-off Rotax 912 engine by ignition switch, not by the mixture cut-off?

As said before, why we should turn-off Rotax 912 engine by ignition switch, not by the mixture cut-off, like in Cessnas?
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Why we shouldn't turn off Cessna 152 by ignition switch (key)? [duplicate]

As said before, why we shouldn't turn off Cessna 152 (and other Cessnas too) by the ignition switch (key) but we cut-off the mixture?
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Why do propeller driven planes have intakes/inlets, such as this one on the P-51 Mustang?

Specifically talking about the p51, why do they have intakes? Don't propeller-driven planes not require any sort of intake because the propeller is what propels it by pushing air behind it?
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9 votes
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What downsides could there be to not letting your engine's oil temperature get above the given limit to taxi/take off before you do so?

I'm not a pilot, and I'm sure most pilots who fly piston aircraft would know this, but what could happen if you operate an aircraft with an oil temperature lower than what the checklist says you ...
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4 votes
2 answers
293 views

How does detonation and pre-ignition affect EGT/CHT readings?

I've read that during engine detonation EGT decreases and CHT increases. In contrast, when pre-ignition occurs both EGT and CHT will rapidly increase. Unfortunately, I can't find a good explanation ...
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4 votes
1 answer
407 views

Am I calculating the fuel consumption correctly?

I'm trying to calculate the fuel consumption for l550e engine. In its datasheet you can see this graph: At 6500 RPM, engine power is around 48hp and the SFC is 345g/HPh. Ok, then the fuel consumption ...
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7 votes
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Why does a fuel-injected engine have a mixture control?

For example, in a C172S fuel injected type, what does the mixture control lever control exactly in the fuel system? They have a fuel air control unit which regulates fuel flow based on air passing ...
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At what speed will the crankshaft be rotating if each cylinder of a four-stroke cycle engine is to be fired 200 times a minute?

Well the answer is 400rpm ; but I don't understand how. Here's my thought process: 4 stroke engine would mean every piston is in a different stage (intake, compression, power, exhaust) Which means 200 ...
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2 votes
3 answers
136 views

Does throttle equal power on a turbocharged piston engine?

On a normal piston engine powered airplane, throttle equals power. If I set the throttle to 50 %, I will get 50 % of the power the engine can develop at the current altitude, temperature, etc. In a ...
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3 votes
3 answers
189 views

Does a diesel piston engine's power decrease more slowly with altitude than with an AVGAS engine?

I have a power-altitude curve of the Austro Engine AE-300 provided by manufacturer and I don't know the reason why power decrease lower than other engines. The curve is in the end of the pdf in this ...
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3 votes
0 answers
71 views

How does the pressure distribution at the blades of a radial turbocharger look like?

Consider a piston engine equipped with a turbocharger. In the turbine section of the turbocharger, the pressurized exhaust airflow comes from the center (radially) to the blades, then changes ...
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Why oil pressure decreases when coarsen the pitch during run-up?

During run-up checks, we set the Throttle such a manner that RPM IS 2000 then we do run-up checks Magneto check 2.prop check Notice RPM drop MAP increases Oil pressure decreases Why does MAP ...
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2 votes
2 answers
171 views

What is vapor lock?

Vapor lock occurs in piston engines especially during summers.. before starting engine we prime it and the engine starts but as soon as we reduce it to near idle or just above idle, engine tends to ...
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0 votes
1 answer
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Why does RPM increase when you lean the mixture in constant speed propeller engine? [duplicate]

In constant speed propeller aircraft like Diamond star DA-40, during run-up checks the AFM mentioned to increase throttle to increase RPM to 2000 and then do magneto check then rpm check then mixture ...
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3 votes
2 answers
285 views

How much drag is actually caused by open cowl flaps?

I am modelling the Cessna 210 for FlightGear, which has cowl flaps. I want the model to be as realistic as possible, and so, I want to know: how much drag do cowl flaps produce ? I could not find any ...
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7 votes
0 answers
238 views

Engine Bearings Damage in Radial Engines

Studying the P47's dive performance in DCS, I noticed how it's easy to damage the engine bearings if you windmill the prop at high speed. Doing some research, I discovered that all radial engines are ...
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18 votes
6 answers
7k views

Why have propeller engines never been mounted on the tail in production transport aircraft?

Recently, Embraer teased this concept. Unlike jet engines, I have never heard of a production airliner or executive aircraft that mounted propellers on the tail like this. From the source: the new ...
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2 votes
1 answer
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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:...
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2 votes
1 answer
122 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 ...
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2 votes
1 answer
160 views

Why is the RPM limit on a Lycoming IO-540 different in the -C and -D versions?

On a Lycoming IO-540, it seems there is a Max RPM difference between the -C and -D versions (and thus a max HP difference too). Does anybody know what is different in the engines that causes this, or ...
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9 votes
3 answers
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Can I assume that AVGAS can be used without any problem when the engine manual suggests RON 95 or higher?

Can AVGAS 100 LL be used without any problem in Rotax 912i engine which suggests a fuel with RON 95 or higher? What would be the advantages of using AVGAS over unleaded RON 95 gasoline?
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1 vote
3 answers
223 views

Are there any spark plug modifications that prevent fouling?

Today, the plane I had, failed the Run up because the magneto test failed. One of the spark plugs fouled out. Other than making sure the engine is properly leaned out (even then spark plugs in a plane ...
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2 answers
126 views

Why is a reciprocating engine air intake a reverse bell shape? [duplicate]

Why would this inlet for the induction system get wider as the air approaches the filter? What net effect does this have on intake pressure, and how would an inlet that starts wide and then narrows ...
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12 votes
2 answers
2k views

Why does using carburetor heat increase fuel consumption?

As written above, why does using carburetor heat increase fuel consumption? Because I found such information in a few SOPs for piston airplanes and I do not understand why does it happen
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4 votes
1 answer
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What is the proper procedure for a piston engine fire on the ground (e.g. during engine starting)?

I am wondering what is the correct sequence of action if there is a fire e.g. during engine starting. Of course I know that there are emergency procedures in each AFM and every single plane is ...
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2 votes
0 answers
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Was Stringfellow's 1848-1868 motor a revolutionary aviation engine or just a useless low efficiency toy which never powered a flying model plane? [closed]

I took a look at the 1848 Stringfellow's aviation steam engine and I do not really understand how it was capable to power a model plane in horizontal flight as long as the motor itself was just an ...
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2 votes
1 answer
225 views

Can a single seater airplane fly with 50 lbs of thrust

An airplane with 10 sq meters of wing five meters fuselage and including one person. can it fly with 50 lbs of thrust? And the max weight is 400 lbs
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-1 votes
1 answer
85 views

Can we get 0:40 thrust to weight ratio from three small engines

Because I have an engine of 13 hp four stroke 1 cylinder that pulls about 0:20 T/W ratio. and is it possible to multiply the thrust by two? Using two more small engines which is 6.5 hp each on the ...
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0 votes
1 answer
271 views

Why not use the engine of a model aircraft for other purpose?

I was reading the DLE-120 engine User Manual and saw this sentence: This engine was designed for use in a model aircraft. Do not attempt to use it for any other purpose. Why? Why not use the engine ...
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9 votes
3 answers
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Why don't all cylinders have priming lines?

Questions about the primer for carburetor engines. Why does the primer only spray fuel to three (sometimes just one) of four cylinders. (Like Piper Cherokee or Seminole) And is it true that priming ...
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1 answer
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Are return springs on a carburetor throttle mandatory or not?

In many GA aeroplanes throttle control is connected mechanically to the throttle of carburetor via a cable. I read in some AFMs that in case of a cable failure, return springs will open the throttle ...
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2 votes
1 answer
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What's for the "smoke fittings" in this muffler?

Just was reading this manaul => DLE-120 engine User Manual In this page (pg 4), saw this part: What's for the "smoke fittings" or "fuel tubing"in this muffler?
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13 votes
1 answer
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What does "spark plugs appear yellow at the ignition point" mean?

I was reading the DLE-120 engine User Manual and saw this paragraph: Caution: Running the engine with a lean fuel mixture will cause the engine to overheat and burn the electrode of the spark plugs. ...
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5 votes
2 answers
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What does this formulation mean?

Just was reading this manual => DLE-120 engine User Manual On this page (pg 4), I saw this formulation: What does it mean? How is the 30:1 ratio calculated? What does "fl oz" mean? What ...
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6 votes
1 answer
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Why do propellors have white markings on their tips? [duplicate]

Why do propellors have white markings on their tips? Here are a couple of examples:
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0 votes
3 answers
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Why do we take off with maximum power settings?

In most GA prop airplanes, take-off is executed with full throttle and high rpm. The usual reasoning is that this way, we leave the first few hundred feet, where failures are most severe, behind as ...
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11 votes
1 answer
1k views

Identify this USAAF biplane

I have been unable to match this USAAF biplane with a similar photo mainly due to the cockpit canopy. I've found no other like it. I believe the photo was taken at Madison, WI or Chicago, IL in the ...
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2 votes
2 answers
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Whenever I hear a plane throttling down quickly, what is happening visually?

I am completely blind and have heard this several times when I was at air shows. Then my friend sent me this recording of a crop duster spraying the fields, and I heard the same type of sound. It ...
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1 vote
1 answer
96 views

Can coaxial rotors be mounted on a piston engine like the Lycoming O-320?

What are the drawbacks of this compared to coaxial configuration with a turboshaft engine?
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8 votes
3 answers
2k views

Why is the maximum endurance for a piston aircraft at sea level?

The Canadian Flight Training Manual stated this when talking about maximum endurance: For reciprocating engines, maximum endurance is achieved at sea level. The book does not explain further as to ...
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0 votes
1 answer
85 views

Does a constant speed prop deliver max speed at max manifold pressure and max RPM?

I was reading a discussion in flight simulator forum and I found this statement: Ignoring the issue of engine overheating, max MAP and max RPM is the best thing for max speed Do you agree with that? ...
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