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BTW this is a real simple way of measuring the thrust of an ejector.
Any homebuilder could make a rig like this.

Also this is a very compact configuration of an ejector that looks
like it would fit almost anywhere. The question is how well does it work? :)

From NACA Research Memorandum E52E21

Stick this in google and you will get the right web site to down load
the pdf. Here is what google came up with:

http://naca.larc.nasa.gov/digidoc/report/rm/21/

Paul Lamar ...No rotor no motor.

Paul,

With all due respect to the NACA engineer who designed this Rube Goldberg
contraption to directly measure thrust using a thrust cell, exhaust slip
joints, and a gizmo that seems to be on a set of wheels, wouldn't it be far
easier to measure vacuum pressure inside the ejector chamber? For our
purposes, getting the augmenter to suck is really our goal. Furthermore, in
pursuit of actual thrust, wouldn't thrust and vacuum inside the augmenter be
positively correlated such that measuring the vacuum would indicate the
design that would maximize both?

Why bother with the thrust cell and castors when a manometer would do?

Barry Gardner
Wheaton, IL


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