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'[OT]: Beagle2 Hohmann'
2004\01\27@131619 by Robert Rolf

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Russell McMahon wrote:
{Quote hidden}

Not quite.
There was no NASA in 1925 if this Stanford quiz is to be believed.
However, there does appear to have been a Hofman at NASA, hence the confusion
with Hohmann.
9. Using the vis-viva equation, one can easily find the delta-v needed to enter one; let the second term be the arithmetic mean of the lower and higher orbits' radii. They require only two delta-v's, as
at both endpoints they are tangent to the initial and final orbits. FTP, name these elliptical paths, first worked out by their namesake discoverer in 1925, ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
the most fuel-efficient transfer orbit between
one circular path and another.
ANSWER: Hohmann transfer orbit

Walter Hohmann (1880–1945) was a professional
engineer who eventually became the city architect of
Essen, Germany. In 1925 he published his masterpiece,
Die Erreichbarkeit der Himmelskörper
(The Attainability of Celestial Bodies), in which he demonstrated
that the interplanetary trajectory requiring the
least expenditure of energy is an ellipse tangent to the
orbits of both the departure and the arrival planets.
The “Hohmann transfer ellipse” has endured, but his
investigations in interplanetary mission design go far
beyond that result and represent a milestone in the
development of space travel.



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2004\01\27@141640 by Andrew Warren

Robert Rolf <> wrote:

> There was no NASA in 1925

   Yes, but NACA (National Advisory Committee for Aeronautics) was
   already a decade old in 1925.  NACA became NASA in 1958.


=== Andrew Warren --
=== Principal Design Engineer
=== Cypress Semiconductor Corporation
=== Opinions expressed above do not
=== necessarily represent those of
=== Cypress Semiconductor Corporation

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