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Recent content by chthulu

  1. C

    Does anyone uses surfaces aircraft design software from unmanned aerial research ?

    @WKTaylor, Could you please tell me what they say here? https://www.homebuiltairplanes.com/forums/threads/surfaces-2-8-aircraft-design-and-analysis-software.34222/
  2. C

    Does anyone uses surfaces aircraft design software from unmanned aerial research ?

    Yes, I guess is not very known. https://www.unmannedaerialresearch.com/product/surfaces-aircraft-design-software/ and https://www.homebuiltairplanes.com/forums/threads/surfaces-2-8-aircraft-design-and-analysis-software.34222/
  3. C

    Does anyone uses surfaces aircraft design software from unmanned aerial research ?

    I'm referring to a software package called "Surfaces", used for aircraft design, particularly in UAV research. It’s developed (or published) by Great Owl Publishing and sold by Unmanned Aerial Research. I'm trying to find out if anyone here has used it before, and if so, what their experience...
  4. C

    Does anyone uses surfaces aircraft design software from unmanned aerial research ?

    Does anyone uses surfaces aircraft design software from unmanned aerial research? It is made by Great owl publishing.
  5. C

    stresses in framed structures

    Thanks, everybody!
  6. C

    stresses in framed structures

    Yes indeed. I did not pay much attention to fig. 9 by realizing that there is already a side called c and therefore the 70 lbs line could not be side c of fig. 8. At the end the 70 lbs line of fig. 9 has nothing to do with any side of fig. 8, therefore you really need to know the angles.
  7. C

    stresses in framed structures

    yes, I now realized that the 70 lbs in fig. 9 is not side c of triangle 1 of fig. 8. I assumed that it was, then I realized that side c is drawn as part of triangle 2 in fig. 9. My mistake. So what side 70 lbs in fig. 9 represents? Line A to B?
  8. C

    stresses in framed structures

    yes, you are right. Ok so you can not copy and paste those triangles of fig. 8
  9. C

    stresses in framed structures

    Bear with me, do you agree that h line of fig. 9 is nothing else than line a + d + h of fig 8? Now, if you instead of using the scale in pounds provided, use the natural scale of fig. 8, and I mean line c is 1.3 cm measured with a ruler, so 70lbs/1.3 = more or less 53.85. You cut and paste all...
  10. C

    stresses in framed structures

    Yes, but the fact remains that in fig. 8, a + d + h should be = 230 lbs if you assume c as being 70 lbs, but it does not; Why? Instead h and J in fig.9 are correct, when you use the scale in pounds.
  11. C

    stresses in framed structures

    Actually there is a simple way to do it with Cremona/Maxwell diagram, but for same strange reason does not give the same results the author got. He says: "Starting at junction 1, fig. 8, form a force triangle as indicated by small sketch shown immediately above. Always measure load directions...
  12. C

    stresses in framed structures

    I was puzzled by that page, because I never found anything like that about truss fuselage anywhere ever. The challenge was: Given: The truss shown above with an end load of 70 lbs. Find: The tension load acting at point A. The compression loads acting at point B. But the guy makes it easy by...
  13. C

    stresses in framed structures

    "Do you understand a Free Body Diagram, and the equations of equilibrium (or static equilibrium) ?" Yes, I do. Yes, the problem with the graphical approach is to get the angle correct, I used digimizer just for the angle between line c and line b of fig. 8 and even with digimizer I could not...
  14. C

    stresses in framed structures

    I can follow instructions, but there is no way that I can accurately copy those triangles, the angle between c and b seems to be 45 degree and I am not even sure of that (actually is between 56 and 57 so no way that I would get it right ), even worse with triangles e,c,f and i,g,J where the...
  15. C

    stresses in framed structures

    no, at the end I was not able to do it graphically, so I have done as above and save the day. I will wait for someone to show me how is properly done graphically.
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