Structures Terminology: Longeron vs. Stringer Structures Terminology: Longeron vs. Stringer Stressbro (Aerospace) (OP) 14 May 14 14:12 Could someone please clarify the difference between a longeron and a stringer? Thanks RE: Structures Terminology: Longeron vs. Stringer HGMorgan (Aerospace) 14 May 14 15:47 http://en.wikipedia.org/wiki/Longeron Harold G. Morgan CATIA, QA, CNC & CMM Programmer RE: Structures Terminology: Longeron vs. Stringer Stressbro (Aerospace) (OP) 14 May 14 15:59 Thank you! (Oh Wikipidea I have a love hate relationship with ) RE: Structures Terminology: Longeron vs. Stringer WKTaylor (Aeronautics) 14 May 14 18:05 The old anlogy of A-is-to-B as C-is-to-D ... Longeron-is-to-sparcap [chord] or beam, as-Stringer is-to-stiffener Regards, Wil Taylor Trust - But Verify! We believe to be true what we prefer to be true. For those who believe, no proof is required; for those who cannot believe, no proof is possible. Unfortunately, in science what You 'believe' is irrelevant – "Orion" RE: Structures Terminology: Longeron vs. Stringer CoffinsCorner (Aeronautics) 15 May 14 09:11 "Longeron" is originally a French word, and the interesting part of this is that in today's French terminology, "longeron" is used to describe what in English is known as "spar" (e.g. longeron avant = front wing spar). RE: Structures Terminology: Longeron vs. Stringer xcllyf (Aeronautics) 21 Jun 14 00:51 As far as my understanding goes, there is a subtle difference between the two and can be used interchangeably. Stringers run a shorter span than the longerons and are more in numbers in a structure. They usually support the longeron in the load carrying as well as distrbute it. RE: Structures Terminology: Longeron vs. Stringer tbuelna (Aerospace) 21 Jun 14 01:56 In my limited experience working on aircraft structure designs, I always understood that stringers were smaller section longitudinal members that were used to stiffen stressed panels like wing and fuselage skins. While a longeron was a larger section longitudinal member that transfers/distributes loads around openings in the stressed skin panels (like hatches or doors) between several frames or ribs. For example, the Space Shuttle airframe has a very large payload bay opening on its top side, and there are two very substantial longitudinal structures, called "sill longerons", that run the full length of each side of the payload bay and tie together the frames ends. These sill longerons are two of the most substantial structures on the vehicle, and would definitely not qualify as "stringers". RE: Structures Terminology: Longeron vs. Stringer LiftDivergence (Aerospace) 24 Jun 14 23:49 Yes, interestingly enough, I have one definition from Theory and Analysis of Flight Structures, by Rivello: "Longitudinal [members] which have large cross sectional areas are referred to as longerons." Keep em' Flying "I intend to live forever, or die trying" - Groucho Marx RE: Structures Terminology: Longeron vs. Stringer GodzillaSuit (Aerospace) 27 Jun 14 00:40 You might also categorize them in terms of applied loads. Stringers are generally designed to primarily take axial loads, so in a simple coarse-grid loads model you might represent them with a CROD. Longerons are generally designed to primarily take axial and bending loads so a simple representation might be a CBEAM or a CROD-CSHEAR-CROD setup.