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Recent content by Macm_020171

  1. Macm_020171

    Forcetec rivetess nutplates

    Rb1957, I think they are good for composites because they are advertising them as such. I think they are good for primary structural applications. Click bonds are not for primary structures. I just heard from a former colleague ( I was searching form different sources) they used these for...
  2. Macm_020171

    Forcetec rivetess nutplates

    Is anybody familiar with these rivetless nutplates that seem to have good application in composite structures? https://fatiguetech.com/products/forcetec-rivetless-nut-plates Thanks
  3. Macm_020171

    Why do the most UAMs (Joby, Archer, Beta, Vertical) adopt the Gull wing?

    rb1957 but here we're talking about the wing design, a wing design is mature in terms of configuration for the certification model. The wing design will not change after entering into service and probably the whole life cycle of the aircraft. Few tweaks might see afterwards, but the skins and...
  4. Macm_020171

    Why do the most UAMs (Joby, Archer, Beta, Vertical) adopt the Gull wing?

    EdStainless all those points you're mentioning have nothing to do with a mature design. Joby wing design is mature. All aircraft manufacturers go through those processes to get certified. And companies as Boeing or Airbus have been struggling through that process as well. Aircraft design and...
  5. Macm_020171

    Why do the most UAMs (Joby, Archer, Beta, Vertical) adopt the Gull wing?

    EdStainless, what aspects do you see that are not mature? Archer and Joby are about to be certified after years of R&D. The engineers that are working there are excellent and brought their experience from other OEMs from all over the world. How more mature a wing/fuselage, empennage design needs...
  6. Macm_020171

    Why do the most UAMs (Joby, Archer, Beta, Vertical) adopt the Gull wing?

    Mainly clearances. These are small aircraft, and the passenger circulation right outside the cabin is limited, so there are potential hazards like hitting the head with wing, booms, pylons, etc.
  7. Macm_020171

    GSD good practices

    I would say good practices are: 1.- Get good training on the tool from competent and DS backed up teachers (Your company should give you that) 2.- Maximize the use of parameters in your design and use simple construction patterns that will simplify changes during the design cycles. 3.- Name...
  8. Macm_020171

    Control surfaces electric actuators stops.

    Hello community, I wanted to know how electric actuators in light aircraft stops the rotation of the control surface to the motion limit +/- deg. Are actuators including an integrated stop system (electronic or mechanical)? Or this stopping feature has to be integrated into the airframe...
  9. Macm_020171

    MIT analysis of battery powered aircraft

    There are a few new manufacturers developing electric aircraft that are designed for certain type of missions, with ranges around 100 miles for 4 passengers 1 pilot for commuting in big cities. For this kind of operations they are pretty much optimized. It seems there is an important market for...
  10. Macm_020171

    Alef flying car

    I have a concern about these structural interfaces. And that wing planform with that kink of the spars is making me hold my breath. I rather keep driving my pick up truck.
  11. Macm_020171

    Alef flying car

    This company pretends to do a flying car that can be parked in your garage with those folding mechanisms. https://www.askafly.com/
  12. Macm_020171

    Composite Airframe Design Stress stack up versus design stack up of plies

    Sparweb, I don't know how a matrix could help me to optimize a layup in terms of design and manufacturing. Can you give me some hints? I think that last post from SWComposites s more aligned with what I need to do.
  13. Macm_020171

    CG sensitivity

    rb1957, we were at a conceptual design phase, a bit far from PDR, I would think that maybe tweaking the aircraft design might have gotten us to have a more efficient airframe and overall performance of the aircraft, but you're right that program might have other constraints such as budget and...
  14. Macm_020171

    Composite Airframe Design Stress stack up versus design stack up of plies

    New in the composite airframe design. I was given a stack up of plies from Stress analysis group based on sizing criteria. Stack up looks symmetric and balanced. But I was asked to validate from a design point of view optimizing weight and manufacturing constraints. What I'm supposed to do...
  15. Macm_020171

    CG sensitivity

    I wanted to follow up on this interesting subject. I was working on a program during conceptual design of the airframe layout and systems integration. It came out that the CG was very delicate and at some point we were not able to change much the structural layout and systems architecture, or...
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