Martin Gregorie wrote:
On Tue, 27 Apr 2004 12:07:37 -0700, Eric Greenwell
wrote:


Bill Daniels wrote:

..../....


The 35 pounds

or so the BRS adds to the non-flying part of the glider bothers me too.

It would likely reduce the allowable cockpit load.


Surely, as the BRS would be installed on or just behind the CG, it
would be more like carrying a turbo in that the cockpit load would
remain as before but the permitted amount of water ballast would be
decreased.

I simplified it a bit too much, perhaps. It would come out of the
"non-lifting parts" limit (basically the fuselage and everything in it).
Generally, the effect would be to reduce the cockpit allowed load, but
not always, depending on the exact weight of fuselage and installed
equipment. The amount of water ballast allowed would not likely change,
since it is carried by the wing (a lifting part), not the fuselage.

A glider designed to carry a motor will have a higher "non-lifting
parts" limit (perhaps from more structure, stronger lift pins, etc) than
a similar non-motorized one, in order to preserve the cockpit load.

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Eric Greenwell
Washington State
USA