Question on Baron 58 prop control

Barrie writes:

How does this compare with the present form of propulsion, such as in the
B747, which I've heard being called "Fanjet"? Is it the same but turbine
blades replace propellor blades while serving a similar function?

Essentially, yes. A turbofan is a jet engine with a very large front
fan in a duct. This fan, which is driven by a turbine in the
combustion section that in turn is driven by hot exhaust gases,
provides most of the thrust. It's like a many-bladed propeller in a
duct (whence the term "ducted fan," which is occasionally used). It's
much more efficient than a pure turbojet, and it also has advantages
over an open prop. It's the preferred mode of propulsion for
commercial airliners these days.

However, turbofans don't work well at transonic and supersonic speeds,
although I understand that these problems have been fixed in recent
years. Likewise, they don't have significant advantages for low speed
flight like that of a small GA plane.

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Transpose mxsmanic and gmail to reach me by e-mail.

Mxsmanic wrote:

However, turbofans don't work well at transonic and supersonic speeds,
although I understand that these problems have been fixed in recent
years. Likewise, they don't have significant advantages for low speed
flight like that of a small GA plane.

Turbofans work very well at transonic & SS speeds. The engines in the
F-15, F-16, F-18, F-22, F-35 (you get the idea) are turbofans (w/
afterburners). The F-22 engines are so efficient they allow supersonic
flight without the burners lit (supercruise) The difference is they are
low-bypass turbofans compared to the big high-bypass engines on
transport category aircraft - (Boeing, Airbus)

Turbines burn lotsa fuel at low altitudes and are most efficient at
high alts, which normally requires pressurization. Your typical GA
plane doesn't fly at high enough altitudes to get the most benefit from
turbine power.

"Kingfish" wrote

Mxsmanic wrote:

However, turbofans

Turbines burn lotsa

You had to give in to the dark side, huh?

So sorry. :-(
--
Jim in NC