On Dec 25, 11:38*pm, Stealth Pilot
wrote:

for all your experimental work on ribs you've never mentioned the
resulting weights?
ok what are they? I'm curious.
----------------------------------------------------------------------------------------------------------------

Hi, Stealth,

Yes I did, but you'll have to read everything I wrote to find it. So
here's some current weights:

5 of the BIG ribs,that finish-out to a about a 60 inch chord, weighed
586 grams (for five) or 117.2g each.
4 of the SMALL ribs, the ones that finish out to about a 50" chord,
weighed 454 grams (for 4) or 113.5g each

I'm assuming the small ones I've measured here are the ones you're
interested in. I have some similar ribs which measure 25.25" between
the spar holes, whereas the ones I've measured above are exactly
24.00" and are intended for use with the 'Chugger' project.
----------------------------------------------------------------------------------------------------------------------------

Checking through the shop, I have examples of the Chugger's rib, ribs
for a modified Teenie Two, some old Primary Glider ribs and so
forth.

Using a conversion factor of .03527 to convert grams into ounces, the
big ribs with their paper gussets AND the section aft of the rear
spar, weighs 4.133 ounces per rib, where as the short ribs (113.5g
each) come out as 4.003 ounces... but of course that's without the
trailing edge. That is, there is NO structure aft of the aft spar
(because the entire trailing edge is meant to move. One reason for
the extra weight is that the short ribs use gussets made of 1/8" thick
doorskins (!). (They are what you would call 'sturdy' ribs :-)

-Bob Hoover