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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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12 votes
2 answers
3k 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
5 votes
3 answers
136 views

How can I find the minimum and maximum airspeeds for efficiency with a specific prop/engine combination?

I'm operating a Cessna 180 with various wing and weight mods with a TCM IO550D engine and a McCauley Black Mac (D3A34C401/90DFA-2 3 blade (88 inch) seaplane prop. I operate Lean of Peak (LOP) for most ...
1 vote
1 answer
99 views

Which Piston General Aviation Aircraft Engine Has the Longest TBO?

After doing some initial research, it appears most GA piston engines have a recommended Time Between Overhaul of around 2,000 hours. I was wondering if there are any other engines that may have a ...
25 votes
9 answers
78k views

Why does manifold pressure increase with power?

Whilst writing an answer to this question, I remembered something I don't really understand. The partial vacuum in the inlet manifold is caused by the piston descending with the inlet valve open ...
2 votes
1 answer
169 views

Turbocharged vs Turboprop cruise altitudes

I know that both turbocharged & turboprop engines offer better performance above 10,000 feet than normally aspirated piston aircraft. My question is to what degree do their optimal cruise ...
2 votes
3 answers
625 views

Why weren't WWII piston aircraft able to fly at 500mph?

So, I just noticed that typical WWII piston engine fighter aircraft had a power to weight ratio of around 300W/kg, even at gross weight and altitude. This means that if we assume that an aircraft has ...
3 votes
2 answers
609 views

What is the general operating temperature of Free Piston Turbine Engines?

The turbine in turbine engines can face temperatures from the combustion chamber up to 1700ºC, but I can't find any information on the operational temperature of free piston turbine engines. I'm ...
18 votes
5 answers
8k 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 ~...
1 vote
2 answers
346 views

Thrust produced by a Lycoming O-360

How would I determine the thrust produced by a Lycoming O-360? I have looked for conversions of horsepower to pounds of thrust but have not had any success.
1 vote
1 answer
231 views

Effects of lead on engines and engine oil

I'm aware of the issues of spark plug fouling and lead deposits that tetraethyl lead can have on an aircraft engine, but what effects do lead and its compounds (metallic Pb, PbO, PbCl2, PbBr2) have on ...
6 votes
1 answer
3k views

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

If you wanted a 737 to have the same design as a single prop light aircraft (i.e. just one prop on the nose, no turbines, APUs or other engines) - how big (and how fast) would the propeller have to be ...
4 votes
1 answer
891 views

What is ACS on a magneto switch?

I was looking at a magneto switch and the text ACS below attracted my attention. What is its meaning and function?
1 vote
1 answer
118 views

Will accidentally using 1 quart of non-mineral oil during engine break in cause engine damage or lead to increased wear in the future?

One of the aircraft I rent is a Piper Warrior (PA-28) with a Lycoming O-320-D2A. I accidentally put regular oil in it today rather than mineral oil. The engine had run 20 or so hours since its ...
10 votes
3 answers
8k views

Why can we not use full throttle in a C172 when cruising at lower altitudes?

My flight training manual (FTM) says that at low altitudes we throttle back our trainers in order to not exceed recommended power settings. We use the Lycoming O-320 engine. But why is that? Is the ...
0 votes
1 answer
92 views

Manifold Pressure System

Hi to all. I read about how MAP works and have a question. Do constant speed planes like the c182 or pa44 have an additional Venturi (apart from the one in the carburetor) in the induction system past ...
3 votes
6 answers
1k views

Is it possible to power an ultralight airplane with a single-cylinder weed-whacker engine?

Plane: Weighs 200 pounds. 16 FT wingspan, 36in. by 5 in. airfoil Engine: 3,000 RPM, 2 HP Propeller: 4ft with 4 blades and weighs 4 lbs. Is there perhaps an equation that could determine this?
1 vote
1 answer
97 views

Diesel engines market share in Piston Airplanes market

I am just trying to understand the diesel engines market-share in the piston airplanes market. Any experience or idea about that ? Just to understand if it is 1% or 10% or more. Thanks in advance for ...
0 votes
0 answers
51 views

Constant Speed Prop Power Settings [duplicate]

I'm studying the performance data for a Piper Arrow with a constant speed propeller. The rule of thumb that I've heard is not to let manifold pressure go above RPM. This performance data seems to show ...
12 votes
4 answers
7k views

Which engine is more financially economical to operate, a turboprop or gasoline engine?

I've seen a discussion about this somewhere before. I'm aware that there's no real way to calculate this. So rather then comparing weight and volume for efficiency, let's compare prices. Which engine ...
5 votes
1 answer
248 views

Need help identifying a radial aircraft engine

I work at the Naval Air Station Wildwood Aviation Museum in Rio Grande NJ. We just acquired what we believe to be a radial aircraft engine that was found by fisherman in the Atlantic Ocean. We'd ...
2 votes
2 answers
144 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?
2 votes
1 answer
102 views

Is there a simple formula for estimating supercharger throttling losses?

I’ve noticed that in both Aerodynamics for Naval Aviators, and most old WWII engine power charts, power vs altitude seems to be composed almost entirely of linear relationships: at a given ...
1 vote
1 answer
163 views

Statistically, Is engine calendar TBO honored more in the breach or the observance?

Surprisingly to me, Lycoming and Continental engines have a recommended overhaul interval (TBO) of 12 years, while Rotax engines have a 15-year TBO. This suggests that engines should undergo frequent ...
9 votes
3 answers
2k views

Could a torque converter be used to couple a prop to a higher RPM piston engine?

Every RPM reduction gearbox I look at seems to have more parts in it than a Swiss watch. Great for keeping time but many parts to wear and breakdown. What seems especially worrisome is the direct ...
3 votes
2 answers
968 views

Why are aircraft piston engines are so low rpm lazy engines?

I understand that the propeller speed should not be too much otherwise it will stall at the tip and be useless so higher rpm engine would be useless when we first think about it. However, we can put a ...
0 votes
1 answer
241 views

Why do beechcraft aircraft start with full mixture and throttle?

I've noticed that barons and bonanza's tend to start with full throttle and mixture. Why do they this as opposed to other aircraft that keep throttle at 1/4 inch and put full mixture forward for a few ...
6 votes
2 answers
4k 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 ...
2 votes
1 answer
384 views

What is the function of the pipe referred to as "Venting Pipe" in the picture and how is it different from the exhaust pipe?

What is the function of the pipe referred to as "Venting Pipe" in the picture and how is it different from the exhaust pipe? The two photos you see in the picture are the "Venting Pipe&...
8 votes
2 answers
911 views

Where exactly is the engine compartment, remarked in yellow?

Where exactly is the engine compartment, remarked in yellow? We know that normally the air going to the engine passes through the air filter. But when we open the alternate air valve, where does the ...
4 votes
3 answers
2k 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?
1 vote
2 answers
286 views

Why could a Rotax 914 light aircraft lose power at 7000 feet?

I was flying an RV 4 equipped with Rotax 914 engine and variable pitch propeller. The problem was observed during flight above 7000 feet; vertical speed became 0, RPM overshoot for 2, 3 seconds to ...
5 votes
2 answers
6k views

How safe is the Certified Rotax 912 versus the Continental O-200?

I'm thinking of buying a taildragger LSA, many of which have a Rotax engine. Continental and Lycoming are the major suppliers of certified piston aircraft engines, and they are considered to be safe ...
22 votes
3 answers
10k views

Carbureted Rotax engines have no mixture control, how do they handle less dense air?

Rotax engines have no mixture control, yet they don't seem to have any more problems than other engines at altitude. How do they handle the lower air density in order to not get a too rich a mixture?
25 votes
7 answers
6k views

Why is carb icing an issue in aircraft when it is not an issue in a land vehicle?

As far as I know, the mechanics and physics of an aircraft carburetor are the same as those of an automobile carb. (If I'm wrong, there is no basis for this question.) Aircraft carbs are provided with ...
9 votes
1 answer
3k views

Why does fuel vaporize in the carburetor?

So I get that a carb vaporizes fuel and mixes it with the air intake for the engine. But my question is what is the explanation for what causes the fuel to vaporize after it exits the fuel nozzle?
24 votes
11 answers
13k 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 ...
21 votes
4 answers
7k views

Why the lack of faster piston-powered planes?

There aren't very many fast piston airplanes in production. By "fast" I mean, if you look back in the early to mid 20th century, before turbines won out, there were lots of piston airplanes in ...
3 votes
5 answers
625 views

Estimating piston-engine thrust on take-off

In my Uni course I've learnt how a piston-engine produces a constant power, as opposed to a constant thrust like in a jet engine, which can be estimated as Thrust = Power / Velocity. However, using ...
8 votes
2 answers
3k views

Why Rotax 912 "burps the tank"?

The Rotax 912 engine has dry sump forced lubrication system. They say rotating the prop in the correct way (counter-clockwise when looking from the prop side) will get the oil from the bottom of the ...
1 vote
1 answer
504 views

How much horsepower do I need for my paramotor?

Assuming my full kit and I weigh 82kg total, I have estimated that I need 5hp. To calculate this, I used the formula: weight force (W) is F = m g W= 82kg*9.8 ms/2 =401.8 Newtons Now, if the drag ratio ...
3 votes
1 answer
971 views

Why does airspeed increase with more throttle if RPM stays the same?

Given a constant speed propeller, the RPM will stay the same because of the governing system which changes the blade angle. But in cruise flight if you add more power and keep the RPM's the same, ...
2 votes
1 answer
154 views

In what way is a Rotax 914 F2/S1 different from a standard 914 F2?

Rotax manufactures the 914 F2/S1 variant, which is (at least) used in Stemme's S10 and S12 self-launching gliders. What are the differences between the F2 and the F2/S1? Bonus question: Why have any ...
16 votes
5 answers
4k views

C-152 carb heat on before landing in hot weather?

I know the POH for the C-152 explicitly states carb heat should be applied before landing. I fly in a tropical country where temperature is at 30°C on average on the ground, twice the standard temp. ...
3 votes
1 answer
345 views

Jumo 222 What are the design choices that lead to this particular nose cone and spinning cowling setup?

Looking for Jumo 222 powered aircraft, I came across this picture of a Junker Ju 288, with this strange spinning cowling and propeller setup, what are the considerations behind this design, how does ...
7 votes
1 answer
1k views

Why was my Exhaust Gas Temperature considerably lower than usual?

I have been trying to understand the exact details of an EGT gauge, specifically to understand why on a recent flight it was (for a short time) reading much lower than I would have expected. I would ...
12 votes
2 answers
4k views

Why do older pistons crank for a while before starting?

Watching older planes startup I noticed they crank for a little bit before starting. Why do they also shoot out flames when starting? Mostly in Mustangs and Spitfires.
13 votes
3 answers
4k views

Why do carburetors tend to produce richer mixture at higher altitude?

The pressure drop in the venturi is proportional to air density and the fuel is at ambient pressure in the float chamber, so I would expect the fuel flow to reduce proportionally with density, and ...
-3 votes
2 answers
359 views

Is a Cessna 162 safe to fly if engine RPM drops by 160 on one magneto?

On a Cessna 162, during engine runup I switch to one mag, and the engine RPM dropped by 50, but on the other mag the RPM dropped by 160 while the POH says maximum allowable drop is 150. Is this plane ...
2 votes
1 answer
953 views

Do constant speed propellers actually increase fuel efficiency?

I have a few questions regarding constant speed props. As a pilot who just recently moved up to aircraft equipped with constant speed props (Cessna 182, Piper Dakota), I understand that a constant ...
5 votes
0 answers
1k views

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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