Increasing power required with altitude.. what's a good plain english explanation?

"Orval Fairbairn" wrote in message
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The power = speed*thrust is valid and is a basic tenet of aero
engineering.

How much power is a B-29 generating during a full throttle run-up before
takeoff :-)

Having said this, I agree now that the equation accurately calculates the
increased power required to fly the same IAS at a higher altitude.

Danny Deger

"Danny Deger" wrote

How much power is a B-29 generating during a full throttle run-up before
takeoff :-)

That goes back to the basic definition of HP. You have to do work on an
object, since HP is the amont of time required to lift an {whatever weight}
object to {whatever} height.

The noise and heat being produced, and the fuel being burned suggests
something else, though. :-o g
--
Jim in NC

Morgans wrote:

"Danny Deger" wrote

How much power is a B-29 generating during a full throttle run-up
before takeoff :-)


That goes back to the basic definition of HP. You have to do work on an
object, since HP is the amont of time required to lift an {whatever
weight} object to {whatever} height.

No, horsepower is not an amount of time. It is a rate of doing work. I
can lift 100 lbs 10' in one minute or I can lift 100,000 lbs 10' in one
minute. Same time, but vastly different amounts of HP required.

Matt