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37 votes
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Why would a turboprop rev down just before going full throttle during takeoff?

Because the pilot is taxiing the airplane with the props in the beta range (turboprops turn into landsharks if you don’t do this and you end up really riding the brakes to keep the speed down), then ...
Romeo_4808N's user avatar
33 votes
Accepted

Is there any reason on passenger airliners not to have a physical lock between throttles?

The problem with physical locks: A locking device can fail "on" (same reason carbureted piston engines use primer systems instead of chokes) so you are stuck with both/all levers ganged ...
John K's user avatar
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32 votes

Why would a turboprop rev down just before going full throttle during takeoff?

It's because he was taxiing in DISC (discing, or flat pitch making the prop like a big disc), which is in the ground beta range, then coming out of it. Beta range is a mode where propeller blade ...
John K's user avatar
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27 votes
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Why does the B-29 not have pilot-accessible thrust?

This setup was actually pretty common for four-engine aircraft of the day. Look at the cockpits of airliners from DC-4 to Lockheed Constellation, and you'll always see a dedicated flight engineer ...
Zeiss Ikon's user avatar
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21 votes

Did the twin engined Lazair ultralight have a throttle for each engine?

I've examined a Lazair, and actually taxied one around on the ground once, and yes there are two throttles. Two reasons: In any twin engine airplane you want to minimize or eliminate single-points-...
John K's user avatar
  • 132k
16 votes

Why do many small piston singles have panel-mount engine controls?

That's where they fit! On both the original 172 and the Piper designs the "center console" area is where the flap bar is mounted, thus preventing the throttle from going there. The C172 has ...
Dave's user avatar
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16 votes
Accepted

What does the "MAX EMR PWR" lever do in a Quest Kodiak?

There is already a great answer quoting from the aircraft flight manual, but I thought I would offer some additional perspective. I'm not qualified in the Kodiak, but both the T-34C and C-208 have ...
Michael Hall's user avatar
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15 votes
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Do any aircraft use throttle steering during normal flight?

Yes, The Northrop Grumman B-2 Spirit Stealth Bomber. The leading edge of the wing has an internal structure that helps it absorb radar energy. The outermost wing segment features a "rudderon" ...
user3528438's user avatar
  • 2,910
15 votes

Can throttle control be considered as a primary flight control?

14 CFR 23.673 - Primary flight controls defines primary flight controls as: Primary flight controls are those used by the pilot for the immediate control of pitch, roll, and yaw. While a throttle ...
aeroalias's user avatar
  • 100k
15 votes

Why would a turboprop rev down just before going full throttle during takeoff?

Most likely this is happening after the pilot advances the power lever -- but the power lever controls both throttle (fuel flow, in a turbine), and propeller pitch. The propeller can change pitch ...
Zeiss Ikon's user avatar
  • 17.1k
15 votes

Did the twin engined Lazair ultralight have a throttle for each engine?

This image would suggest it had two throttles, located in the usual position on the pilot's left side:
AEhere supports Monica's user avatar
14 votes
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Why does spin recovery involve cutting the throttle?

Applying engine power can indeed help to end a spin. But the added thrust will make an overspeed in the ensuing spin recovery much more likely. Also, applying asymmetric thrust on the wrong side will ...
Peter Kämpf's user avatar
12 votes
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Does the mixture and throttle setting affect the quality of priming of fuel prior to start?

On a carbureted engine, the mixture and throttle setting does not affect prime, which uses a separate injection system that draws fuel into a syringe and injects it into the intake passages at the ...
John K's user avatar
  • 132k
11 votes

Why doesn't the plane accelerate/move forward when it's at rest, if the propeller is spinning?

When you start the engine in the c172, the blades on the prop are spinning - but the plane doesn't move at all. When the propellor is idling its obviously moving air, this you can see, feel, and ...
Dave's user avatar
  • 101k
11 votes

Is it possible that derated thrust takeoffs are safer than normal takeoffs?

An airline policy of doing reduced thrust takeoffs is considered to improve safety in the longer term by reducing the probability of an engine failure, due to reduced cumulative wear on the engines ...
Jannie's user avatar
  • 111
11 votes
Accepted

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

Yes, your assumption as stated below is correct. There's really no simpler way to explain it than that. So when there is an increase in throttle/MP and more fuel/air mixture goes to the cylinders, ...
Michael Hall's user avatar
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10 votes
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Why do jet planes with multiple engines have separate throttle levers for each engine?

All multi-engine airplanes, whether jet or prop driven have separate throttle controls for each engine. There are good reasons for this: If there is a problem with one engine you can separately ...
GdD's user avatar
  • 54k
9 votes

During a touch and go (C150) should I first raise flaps or set full throttle?

Flaps in a C150 (and pretty much any type) take a few seconds to move. Throttle change is more-or-less instantaneous. If you were to throttle up first, and then change the flap position there is a ...
Jamiec's user avatar
  • 33.4k
9 votes

Why are the B-52 thrust levers advanced inside-out?

The video shows the pilots starting the engines. The typical engine start procedure on the B-52, either engine number 4 or 5 is started first. This video shows them starting engine number 5 first. ...
OSUZorba's user avatar
  • 2,639
9 votes

Why does spin recovery involve cutting the throttle?

Several issues: Gyro precession induces pitch effects that may help or hinder depending on the direction of rotation P factor, which may help or hinder depending on the direction of rotation. ...
John K's user avatar
  • 132k
7 votes

What is the throttle setting of a piston aircraft during cruise?

Broadly speaking its what ever you chose it to be. You should always refer to your aircrafts POH for the information specific to your airframe and engine. Beyond the POH there may also be supplemental ...
Dave's user avatar
  • 101k
7 votes
Accepted

How are rotary engines controlled?

Some of the early radial engines that operated by rotating the entire engine along with the prop, specifically, the very popular Le Rhone didn't have proper throttles. The pilot controlled engine ...
tj1000's user avatar
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7 votes

Do any aircraft use throttle steering during normal flight?

Another aircraft is the AeroVironment Helios, which was solar powered and flew with ten or fourteen electric motors. The torque of an electric motor can be controlled very rapidly and precisely, far ...
user71659's user avatar
  • 6,613
7 votes
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During multiengine training, are pilots taught how to use the throttles for control?

No. In a piston multi course the focus is on flying the airplane and single engine procedures. Loss of rudder control in something like a Seminole is not a big deal unless the engine quits after ...
John K's user avatar
  • 132k
7 votes
Accepted

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

All things equal, the throttle setting has no meaningful impact on the stoichiometry of the fuel-air mixture, it just changes the volume of that mixture that's allowed to flow into the cylinders. ...
William Walker III's user avatar
6 votes
Accepted

What factors determine the power curve of a jet engine?

Not a direct answer, but one thing to keep in mind is that thrust has very non-linear dependency on RPM. 70% N1 may mean 20-30% thrust. (And that's static thrust; in flight the difference may be even ...
Zeus's user avatar
  • 9,083

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