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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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Was there ever a fuel-injected Spitfire?

I couldn't find one but did it ever exist? Would adding fuel injection have improved combat effectiveness or fuel efficiency?
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1answer
263 views

Is there a formula to convert SFC to air-fuel equivalence ratio λ?

Speaking about aviation internal combustion engines, is there a way to get the current value of air–fuel equivalence ratio (λ) given current specific fuel consumption (SFC) and current power? Is the ...
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4answers
5k views

Why isn't the APU a standard diesel generator?

Why isn't the APU a standard diesel generator? Jet-A and diesel are interchangeable (with the addition of a lubricant). So why not use a cheaper piston engine as opposed to a jet turbine? V.S.
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0answers
264 views

Can a turbo aircraft be converted to non-turbo?

I'm specifically thinking about the Arrow III. There are hundreds or possibly thousands of turbo Arrow III's, but almost no non-turbos. Could I buy an Arrow III Turbo (PA-28R-201T) that is at TBO ...
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2answers
147 views

On SEP airplanes, why does the fuel consumption decreases with temperature, pressure and airspeed being equal?

Looking at the cruise performance tables in the POH of the C150, C172 or C182, one can see that for the same pressure altitude, the same RPM and the same true airspeed, the fuel consumption is reduced ...
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2answers
2k views

Is there any legitimate reason for adding momentary power when descending at idle with full carburettor heat on?

Scenario: While demonstrating a simulated engine failure emergency landing a flight instructor puts on carburettor heat and reduces the throttle to idle of a small single engine Cessna. After a couple ...
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2answers
775 views

Is it common for a cold reciprocating engine to stop at idle?

The other day I started the engine of a PA28 and put it at 1200 RPM as per the checklist but the sound didn't seem right - so I tried each magneto and the power dropped a lot on one of them. I then ...
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1answer
763 views

What are the consequences of pumping the throttle in an carburetor piston engine airplane during start?

I have seen an expert commercial pilot pumping the throttle during start for a Cessna 152 and ever since I thought that was ok to do so, but recently studying for ATPL I read about that these ...
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3answers
220 views

Is there a system where plane/heli auto adjusts prop pitch/mixture?

This one is simple: is there a system that automatically adjusts things such as: Mixture (I Am bored of listening for engine sounds) Prop Pitch (I Hate auto adjusting "gears") So I can ...
10
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1answer
942 views

When sizing a powerplant for a GA aircraft, how do you estimate the power required for other electrical systems?

When designing a GA aircraft, I have sized a powerplant (in kW) needed to run the plane on its mission. However, this does not consider the power needed for avionics, de-icing, etc. How do I approach ...
14
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1answer
1k views

How does carb heat increase the risk of dirt ingestion?

In this question about turning off carb heat just before landing, one of the justifications for doing so is to reduce the likelihood of ingesting dirt into the engine. How does carb heat (or the lack ...
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3answers
2k views

Should I have carb heat on for landing in a C152?

There is quite a debate about this! I'm a student, have gone solo. My first instructor insists the carb heat goes off/COLD on the approach ('ready for go-around' if needs must! And to prevent dirty ...
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1answer
16k views

What is the aircraft model used in the film “American Made”?

In American Made, what is the model of the white airplane that the CIA presents to Barry Seal (played by Tom Cruise)? He says something along the lines of "the fastest piston twin". Are those ...
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3answers
1k views

Why does MAP show ambient pressure when engine is shut off?

Manifold pressure is the absolute pressure at the intake manifold and increases as throttle is increased and vice versa. However, when the engines are shutoff, the manifold reads ambient pressure. My ...
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1answer
262 views

Is there a 180HP conversion available for a 2011 160HP Cessna 172R with a Garmin G1000?

I've recently purchased a 2011 172R (160HP) with a G1000 on the sellers promise that I can apply a propeller switch and modified air intake STC to get the derated engine back to 180HP. However, the ...
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2answers
279 views

Why use a single engine plane instead of a multi engine one for a long range flight record?

Tupolev ANT-25 was designed specifically for setting flight range records. In 1937 two flights from Moscow, Soviet Union to USA via the North Pole happened - one covered 9130 kilometers and finished ...
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3answers
952 views

Can a GA magneto-spark plug ignition survive an EMP?

Can the coil and capacitor (condenser) magneto/spark plug ignition system as exists on most general aviation aircraft survive an EMP? Let's talk about a standard Lycoming or Continental engine. How ...
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2answers
162 views

Are run-ups required for multiengine piston aircraft?

Are run-ups required or advisable on multiengine piston aircraft?
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6answers
4k views

What is the theoretical maximum RPM of a typical aircraft piston engine?

Given a standard 6 cylinder horizontally opposed engine like the Continental IO-550 or Lycoming IO-540, the maximum RPM for those engines is 2700 RPM. That's due to keeping the propeller tip speed ...
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1answer
1k views

How does a two-stage supercharger work?

How does a two-stage supercharger like the one found in a Rolls-Royce Merlin work? Does the pilot have any control over it?
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2answers
8k views

Are there any pressurized piston-engine aircraft?

Are there any pressurized piston engine-powered aircraft? Or does pressurization require a turboprop or jet?
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1answer
179 views

What is the relationship between fuel mixture and RPM in a reciprocating engine?

I'm doing a project on a safety occurrence but I don't understand how the RPM of an engine is affected by the fuel mixture. How does a richer than normal mixture result in lower RPMs?
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1answer
178 views

Why don't small props have a gear? [duplicate]

Small GA-Aircraft like a Cessna 172 or a Piper PA-28 have an engine similar (I think) to the one of a car. But why don't planes have a gear and a lever to change the gear? Would'nt they achieve a ...
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1answer
220 views

How does the idle mixture adjustment in a Stromberg NA-R9B float-type carburetor work?

At what temperature should idle mixture adjustments be made in Stormberg NA-R9B float-type carburetor?
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1answer
350 views

How does the idle speed adjustment in a Stromberg NA-R9B float-type carburetor work?

What is the purpose of the idle speed adjustment in a Stromberg NA-R9B float-type carburetor? In what situation do we adjust the idle speed?
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1answer
4k views

How is oil distributed through the engine in a wet sump system?

A wet oil sump is within the engine crankcase. However, how is the oil distributed throughout the engine and all the other magical parts? I know for a dry oil sump, it's with a oil pump which holds ...
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2answers
11k views

In which phases of flight should the carb heat be turned on?

I have about 200 flight hours in a fuel-injected C172. I have just jointly bought a C152 with a carburetor and I am getting used to using the carb heat. I am scared whenever I hear stories about ...
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4answers
495 views

I overboosted an engine in a Mooney 231 - do I need to do an inspection?

I have an intercooler, but no wastegate. Manifold pressure was not controlled on takeoff and went to 50. The max is 37! If overboosting doesn't really exist because the relief valve opens, then how ...
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1answer
1k views

Do some radial engine planes have a two-speed starter motor?

(YouTube) Watching the Connie fire up her engines I wondered, do some radial engine planes have a two-speed starter motor to replace the ground crew "pulling the props through"? In other words, low-...
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1answer
826 views

Why are some fuel-injected engines started with the mixture at idle cut-off?

The POH for a C172N with a carbureted Lycoming O-320 says: STARTING ENGINE Mixture -- RICH Carburetor Heat -- COLD Master Switch -- ON Prime -- AS REQUIRED Throttle -- OPEN 1/8 INCH ...
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2answers
510 views

Why are ethanol piston engines apparently cheaper to maintain than avgas piston engines?

In the course of hunting for examples of 100% ethanol-powered piston engines, I found the Embraer EMB 202 from Brazil that is modifiable to be that way. But the article also says "The alcohol fuelled ...
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2answers
576 views

Why does my Cherokee PA28-180 Lycoming motor run hot?

Regarding my Cherokee PA28-180. Could you please explain me why my new Lycoming engine with 800 hrs runs hot? My mechanic says that the EGT #2 should be around 1350 degrees. The minute you lean the ...
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1answer
1k views

Why don't contra-rotating propeller configurations with more than two propellers exist?

I wasn't able to find a single example of more than two propellers stacked axially in a contra-rotating configuration. There is a huge number of contra-rotating propeller setups, but it is always a ...
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1answer
561 views

Why do piston engines have a lower fuel consumption with higher temperatures?

It is very common to find in the AFM/POH, Section 5 of most piston engine airplanes (C152, C172, PA28, BE76, etc) charts that indicate the fuel consumption for cruise/economy power settings. You ...
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1answer
594 views

How do turbofans and piston-engines compare in terms of maintenance costs?

I want to compare piston engines and turbofans on a maintenance basis. Let's say both engines are capable of 100 kN of thrust. Let's say both engines fly for 10,000 hours. Over that time, what kind ...
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10answers
8k views

Why do piston engines in aircraft burn fuel at a higher rate than a comparable car engine?

I've never understood why piston powered plane engines burn such a large amount of fuel per time period than car engines. Can anyone elaborate on this? I know that a C172M will burn ~5-9+ gph at ...
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2answers
749 views

Why are car engines not used for planes? [closed]

I found this picture of a 1/2 VW Bug pan air cooled engine in a plane. Source What other air cooled car engines work well in a plane?
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1answer
159 views

Can a small UAV restart its engine in mid-flight?

Is it possible for a small UAV, say a small piston-engine aircraft with a low windmilling effect, to restart its engine in mid-flight following an engine shutoff?
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9answers
18k views

Why increase the number of cylinders in an engine instead of increasing their volume?

I've been reading about WW2 planes lately. Some of them have 12 or even more pistons in their engines. But if your goal is to increase power, why would you add more pistons instead of simply ...
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5answers
8k views

Why is water-contaminated fuel bad, but water-injection is not?

A "wet" takeoff of a KC-135 with J57 engines—By USAF Photographer (USAF photo) [Public domain], via Wikimedia Commons Why is water-contaminated fuel bad, but water-injection is not? The way I ...
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2answers
1k views

In high-altitude piston aircraft, what type of forced induction (boost) is used?

In high-altitude piston aircraft, what type of forced induction (boost) is used? Turbocharger or supercharger?
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2answers
2k views

What are the consequences of fouled spark plugs in flight, and how can I clean them?

I've experienced spark plug fouling before but it was during the pre-flight checks and my instructor fixed it for me (by using max RPM and leaning the mixture a couple of times). But now that I have ...
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2answers
2k views

Is it possible to hand start modern planes?

I know that older planes must be hand started but are newer GA planes even able to be hand started by spinning the prop? If so, how do you do it safely without cutting your hands off or being pulled ...
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1answer
342 views

Where to find information on the Daimler-Benz 606/610?

There seems to be relatively little information regarding either of these engines on the web. Anyone have an idea where I can find more info?
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1answer
291 views

Purpose of CHT drop in piston engine shutdown procedures? [duplicate]

One of the items in the helicopter Robinson R22 (and possibly other piston engined aircraft) shutdown procedure is to wait for the Cylinder Head Temperature to drop to a lower temperature. What is the ...
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2answers
509 views

How do contrails compare between piston-powered aircraft and jet aircraft?

Based off this question, I got interested on how contrails compare between jet engines and piston powered engines. Seeing images like these from WWII, I am wondering what the significant differences ...
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1answer
1k views

During an engine restart procedure, what are the purposes of a.) throttle back to idle and b.) primer “in and locked”?

I was making some study flashcards today for Emergency Procedures in the Cessna 162 POH, and realized that I don't quite understand steps 2 and 6 of the ENGINE FAILURE DURING FLIGHT (Restart ...
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4answers
1k views

Why don't airplane turbo piston engines have boost control?

Why is it possible to over-boost piston aircraft engines? All turbo car engines have a wastegate that just vents pressure back to the intake, whereas in an airplane the pilot has to look at the ...
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4answers
5k views

Why does the Piper Cherokee (PA-28-140) engine have such low horsepower despite the very large displacement?

I'm sure this question could apply to many other plane engines, but specifically I'm looking at the Piper Cherokee PA-28-140. Surprisingly, it appears that the engine used, the Lycoming O-320, has ~...
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0answers
121 views

What variables is an engine's AFR based on?

Maybe this is a bit too technical for an aviation forum, but it specifically concerns a flight engine.(Rotax 912 iS) Road vehicle engines will probably have different behavior. As you may know, the ...