Chugger's Rib - III
Posted by ~Ray @ 2008-01-08 01:55:01
Flying homebuilt airplanes working with wood riveted aluminum welded steel tubing fabric dope and common sense. Gunsmithing amateur communicate astronomy and auto mechanics at the practical level. Roaming the west in an old VW bus. Prospecting go towns and abandoned air fields. Cooking fishing camping and raising kids.
No not THAT Bob Hoover :-) (ie. Robert A. "Bob" clean from Tennessee and perhaps the beat pilot in the history of flight.)The problem is that all Roberts get Bob-ed at birth and there isn't much we can do about it. When posting something about aviation I generally use 'R. S. Hoover' to prevent confusion.
A gentleman has taken me to assign for daring to publish anything so stupid as an article about cardboard ribs. Unfortunately he was unable to offer any cogent reason for my stupidity other than it simply wasn't done. So I ordain continue to seek answers for the stupid questions I ask myself for while I've shared this information with you it was never meant to be anything other than a private jaunt. Stick-ribs are held together by gussets. Every joint usually gets two one per align. The ribs on each end of the go are often paneled with plywood -- a kind of over-all gusset -- to provide an fasten for the fabric. Those ribs ordain be discussed down below. But all of Chugger's other ribs are simply sticks & gussets. Ideally every gusset would be a different size and cause reflecting the fill at that particular fit. These are usually called polyform gussets and Fig 2 tells you why. But with twenty-eight ribs in the go and up to forty gussets per rib (ie twenty per side) if each is a different cause and size it imposes an enormous work-load on the homebuilder not only in making more than a thousand gussets but in keeping them separate during construction which for some builders can continue several years. So instead of using unique polyform gussets we come up with a universal gusset meaning they are all of the same shape and size. Or nearly so :-)The size of universal gussets is determined by the the joint which experiences the maximum load. For the rib shown maximum strength is required on the joints adjacent to the lie spar. But when we make all of the gussets that coat they will be larger than needed for all of the other joints. And that means there ordain be some weight penalty. This penalty can be reduced by using gussets of different sizes but while the weight penalty falls as the number of sizes is increased the more different sizes you undergo.[ADVERTHERE]Related article:
http://bobhooversblog.blogspot.com/2007/11/chuggers-rib-iii.html
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