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  1. Othman

    Composite acft--why so heavy?

    This is turning into an interesting discussion. Like many of the forum members I've gone through several "paper" airplane designs, some metal, some wood, some composite etc.. Each construction material/method has its pros and cons, which are discussed extensively over numerous other posts...
  2. Othman

    Discussion on Safety Factors for Composites Design and Testing

    autoreply, I'm glad it got you thinking and looking at your design. That is what I intended by bringing this up in a sort of design example. When I was doing the research for myself I though it would make an interesting post as it isn't discussed very clearly in much of the available...
  3. Othman

    Discussion on Safety Factors for Composites Design and Testing

    Here is a link to the NIAR AGATE site that has a good collection of data (this link was posted on the forum before): http://www.niar.twsu.edu/agate/ In these test reports, full saturation of the test coupons is defined as the following: "Effective moisture equilibrium was achieved when the...
  4. Othman

    Discussion on Safety Factors for Composites Design and Testing

    Thanks autoreply, As is with most things, the answer is "it depends". The data shown in the original chart is only one sample for a specific laminate. Different materials and processes will result in laminates with different performance (strength loss due to moisture ingress). It is up to...
  5. Othman

    Discussion on Safety Factors for Composites Design and Testing

    Thanks wsimpso1. Your craft looks like it's coming along nicely by the way.
  6. Othman

    Discussion on Safety Factors for Composites Design and Testing

    Hello everyone, it’s been a while since I’ve posted anything on the forum, although I have been popping in once in a while for a quick read of the interesting things going on. I’ve been meaning to write this post for some time now as it’s quite an important subject and I haven’t seen it...
  7. Othman

    Zenith CH640 questions

    Something to note about the specifications for any of the Zenair products is that the advertised structural load factors are specified as "Ultimate". This is the load that will actually break the airframe. The airframe will twist and bend long before that. For non-engineering types, "Limit"...
  8. Othman

    When lightning strikes

    This is a very good topic. Thanks for starting it Autoreply. The aluminum or copper mesh material is quite thin (.002" and up), less than a ply of glass. It is layed up in situ with the glass plies in the laminate (co-cured). The mesh is located at the outer most surface of the laminate just...
  9. Othman

    Canadian Reg's

    Just to add a bit more info here, Canadian ultralight standards are managed by the (or have been delegated to) the Light Aircraft Manufacturers Association of Canada (LAMAC). Their website has a bunch of information on ultralights and differences between basic and advanced...
  10. Othman

    Megalomania...

    The aircraft shown in the rendered drawings look like they're carrying an apartment building. Were they considering renting out office space? If so, I would be interested in one of the wing leading edge offices :)
  11. Othman

    Welding 6061-T6 Question

    Strength of welded aluminum joints is always a topic of debate in engineering. Some engineers use them regularly in their designs (with proper analysis and testing) and some avoid them all together... much like the debate between going with sheet metal or composite construction. Anyway, I've...
  12. Othman

    Here's a challenge

    I would still question the legality of the job... Even for a repaired part, the work needs to be done by a licensed A&P (which you might be, I don't know). Since the aircraft belongs to the flying club I assume it is commercially registered. If this were in Canada, the work would have to...
  13. Othman

    3D Cad (Lesson 101)

    Unless you're using a high end CAD package like Solidworks at your work (or you use own it for you private business), they are far too costly to be practical for the hobbyist or small business... unless of course you're into pirating software. Supejacent, if you want to have a 3D model that...
  14. Othman

    aeronautical design services

    See above.
  15. Othman

    Propeller moment parameters? accuracy query

    For stability derivative estimates your best bet is to start with Jan Roskam's "Airplane Design Part VI". Another good reference for stability analysis is "Dynamics of Flight: Stability and Control" by Etkin and Reid.
  16. Othman

    Question about Spar Location in Chord

    Orion, we've discussed this matter before both in this forum and through private e-mails... I did some additional research and also talked about it with a FAA certification engineer to get more insight into the matter of stress concentration factors around holes and local yeilding. It turns...
  17. Othman

    How to create a STC?

    K-Rigg, A One-time STC is an STC that is only applicable to one aircraft (one serial number) or to a specific group of aircraft that are specified by serial number on the STC. Regular STC's can be installed on any aircraft that is on the approved models list of the STC. This is usefull if...
  18. Othman

    How to create a STC?

    K-Rigg, A One-time STC is an STC that is only applicable to one aircraft (one serial number) or to a specific group of aircraft that are specified by serial number on the STC. Regular STC's can be installed on any aircraft that is on the approved models list of the STC. This is usefull if...
  19. Othman

    How to create a STC?

    The process to develop and STC is fairly straight forward, but there is a lot of work involved. It's all about understanding what regualations are affected by the modification and demonstrating how the regulations are met post mod (testing, analysis, design features etc). The better you...
  20. Othman

    wooden aircraft plans

    Take a look at the aircraft offered by Falconar Avia: http://falconaravia.com/
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