Measurement of CofG

I am sure I am not on my own when I say I have an Excel spreadsheet with
the calculations for C of G to be done. It may not be pretty but it does
the job. If you want a copy email me.
Croft




At 04:51 12 January 2012, RAS56 wrote:

Hagbard Celine;807559 Wrote:
If the shop has a digital protractor you could also convert the rise/
run to degrees, put the protractor on the specified part of the tail
boom and raise the tail until it reads the correct angle.

Arctan(rise/run) = angle in degrees

About 2.1 degrees, sloping down towards the tail in this case.



Same question, hopefully same answer...could use a little more info.

I'm trying to put together a W&B event at our club, we're bringing in
outside help from another club with a set of scales and the experience
of knowing what to do.

WRT positioning the glider at the correct angle, my ship is an ASW-19b.
Although my owners manual has a page dedicated to CG info, there's
nothing in there about what procedure to use to actually weigh the
thing. It's just a page with a CG envelope on it.

Now I did find on page 30 of the manual (a page that has general
dimensions as well as specs for control deflections) a side view drawing
with info presented as the thread starter discussed, mine says 1000 by
45.

SO, to do the procedure correctly, construct a small triangle with those
dimensions, inflate the main wheel to proper pressure, put a level on
the triangle, then raise the tail till I get a level bubble? It would
seem to make sense that this is done with wings level laterally as well,
correct? Lightly (fingertips) or is a wingstand under a tip ok? THEN,
take the weights?

Finally, this will be the 4th W&B for this glider. All the ones done
previously have had a "form" with a glider drawing on it and appropriate
spots to fill in main wheel/tail wheel weights, etc. Where can we obtain
"blanks" to fill in our ships for our event? We will have an A&P IA
overseeing the process and signing off logbooks. As I said, I'm
coordinating, so I'm trying to get all the info/materials each owner
will need to have on hand at weigh-in so the event goes smoothly.

Thanks much,

Rob
ASW-19b
ZAP

Ps-sorry if this double posts...




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RAS56