Re: How Rockets Differ From Jets


George Evans wrote:
> Airfoils don't magically create energy. The only source of energy are the
> motors. A good airfoil can *minimize* the added energy necessary to achieve
> orbit over that necessary for a vertical launch. But flying to orbit is
> still going to cost you more.


Your 'frictionless surface' though experiment is interesting and I
shall give it some thought. And, yes, nothing magically creates
energy.

Yet, I am still intrigued by the B-29 that won WWII.

With an engine thrust of 1/10 it's takeoff weight it could fly
thousands of miles, drop tons of bombs, and return. It's thrust to
weight ratio only increased a little when it dropped the bombs, but
with substantially less than a 1:1 thrust to weight it would fly it's
mission again and again.

Nothing magically creates energy but far less thrust than weight could
take this plane to 20,000 feet and hold it there for hours. This is
'interesting' too.


tomcat

.

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