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  1. C

    Residual Strength Composites- Last Ply Failure-Purpose Vs FARs.

    A composite structure in an aircraft is stressed to limit or ult as the case calls for. Defects are introduced during manufacture and may be inflicted on the aircraft in service. The materials test programme will establish acceptable levels of damage viz-a-viz the far field allowable strain...
  2. C

    Composite Anisotropy

    Just a short update, the laminate analysis programme that launched this negative shear issue is fully anisotropic with D16 and D26 non zero values. At the time of using it some months ago, the absence of the negative shear option became apparent for D16 and D26. It seemed that the shear sign was...
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    Composite Anisotropy

    A question for those interested in composite panel buckling. It has been a curiosity as to why edge shear on a typical panel or structure is generally treated as a positive value or magnitude. It seems to be a practice and for metallics, it would be reasonable to assume that as metal is more a...
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    Design Phase Product Integration Management- A new GA Aircraft

    SW I have to agree with you on several counts. NDT is a bit more advanced. (probably to catch increasing defects) Then Vacuum Resin Infusion, hot drape, also. Last project I did paid me to look deep into composites theory in the 60's because that's where a lot of the theory started. The research...
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    Design Phase Product Integration Management- A new GA Aircraft

    RB1957 and all the learned people who contributed I think it is time to close this conversation as it has drifted across many areas, Project Management, governance, system of regulations, digital issues, composites and it all very interesting but academic in a context where the challenges in...
  6. C

    Design Phase Product Integration Management- A new GA Aircraft

    "Consider a 30-year career... Do you want a career where you repeat 1-year 30X... that's' OK... and possible. OR do you want a 30-year career where each year's experience is The above message came in by email but has not appeared yet on the forum. As the author says, we only get a thing slice...
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    Design Phase Product Integration Management- A new GA Aircraft

    Very interesting, am investigating this reference. There is a huge issue about a small Pt 23 aircraft being funded by investors Vs a goliath company developing a new or derivative airliner. In all cases there has to be carefully controlled financial decision making but this is hampered by the...
  8. C

    Design Phase Product Integration Management- A new GA Aircraft

    There are some very good points made here and some insights to getting a project right first time or relying on Project Management to apply adequate control to ensure the product is valid. BUt inevitably for any aircraft, there are prototypes to be tested and learned from and no amount of...
  9. C

    Design Phase Product Integration Management- A new GA Aircraft

    Again interesting comments and I hope the upcoming organisation has done all the high level specification, road maps and so on and system requirements. And you are right, some companys do this during in advance of design, don't do it or treat it as admin activity. In the Project Management...
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    Design Phase Product Integration Management- A new GA Aircraft

    Please accept my thanks for your many interesting contributions. The question " we need a system or help to manage the interfaces" is perhaps a tell tale sign of one of two things or perhaps both. 1: The programme management system may need a review, 2 the engineering team may need support. 3...
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    Design Phase Product Integration Management- A new GA Aircraft

    Let me go back to the question again: The customer wants help to ensure they manage the interfaces well in new aircraft (not just the wing) across all products attaching to the airframe. Its a bid proposal. The customer is not disclosing how they plan to manage the issue nor what project...
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    Design Phase Product Integration Management- A new GA Aircraft

    Thank you for all these good answers. Please keep them rolling and let me give a little background below. I have been involved in PDR's since early 1990's on space and aircraft projects but I am still a bit baffled by the question below, even though I have just participated in a complete design...
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    Design Phase Product Integration Management- A new GA Aircraft

    I need to answer a question about a practical thing in aircraft design management...maybe you could help? Here goes......during the design phase, for PDR, all the systems have to be integrated into the wing, engines, fuel lines, landing gear, wiring, flight controls, the whole lot that bolts...

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