BBerson's Recent Activity

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  1. BBerson replied to the thread Limit vs ultimate load.

    Typical 2024-t3 yield is about 40ksi. And the ultimate yield is about 60 ksi. Which is 1.5 times yield, hence the 1.5 safety factor rule...

    Nov 21, 2019 at 4:39 PM
  2. BBerson replied to the thread You're All Trash*, Part 234,567,988 - DarkAero.

    I don't think the small split rudder I saw at Osh will have much drag effect, in the mixed flow behind the airplane. Also might be hard...

    Nov 20, 2019 at 10:06 PM
  3. BBerson replied to the thread Raptor Composite Aircraft.

    I didn't see any yaw in the video, but I suspect his nosewheel system might not be very stiff from the previous videos. The roll could...

    Nov 20, 2019 at 3:38 AM
  4. BBerson replied to the thread Raptor Composite Aircraft.

    I think it's a yaw/roll interaction. The nose wheel is likely turning back and forth and that causes a roll. Almost a low frequency and...

    Nov 20, 2019 at 12:09 AM
  5. BBerson replied to the thread Has anyone be thinking of designing a more modern, light weight powered sailplane ?.

    Doesn't take much to start the Limbach (VW) windmilling in flight. On the Grob with the feathering prop I can usually get it windmilling...

    Nov 19, 2019 at 8:47 PM
  6. BBerson replied to the thread You're All Trash*, Part 234,567,988 - DarkAero.

    Well, just like pants, airplanes should be sold in small, medium and large. A small person can roll up the cuffs and wear big pants. Big...

    Nov 19, 2019 at 4:16 PM
  7. BBerson replied to the thread You're All Trash*, Part 234,567,988 - DarkAero.

    The designers are very small, as I recall. Not a kit for all sizes.;) I don't care for the minimal wing area/span in a sport plane. The...

    Nov 19, 2019 at 3:19 PM
  8. BBerson liked astroaero's post in the thread Oshkosh 2019.

    @BJC: link available to recording of one of Wainfan's forums from this year [MEDIA]

    Nov 19, 2019 at 12:57 AM
  9. BBerson replied to the thread 2 aero questions about flaps please.

    Right. For full span flaperons, the outboard half could be somewhat less incidence. Or if ailerons are desired instead of flaperons, by...

    Nov 18, 2019 at 11:28 PM
  10. BBerson liked stanislavz's post in the thread Shoulder wing unpopularity.

    "Буревестник" pre 2ww soviet buil high performance airplane. Info only in Russian. Wood only. Will add more info on structure later...

    Nov 18, 2019 at 8:47 PM
  11. BBerson replied to the thread Long flight SE to NW Planning.

    If you have time to spare, go by air.

    Nov 18, 2019 at 4:13 PM
  12. BBerson replied to the thread Tube construction: Alternatives to conventional welding.

    The 1/2" lugs are for tight fit in aluminum, I think. I doubt 1/2" of a 4" wood hub is enough. But who knows? Older engines made for...

    Nov 18, 2019 at 4:04 PM
  13. BBerson replied to the thread Tube construction: Alternatives to conventional welding.

    Use the hard 3M Scotchweld (like Avid and Kitfox) under the rivets, not Proseal rubber which is not a structural adhesive.

    Nov 18, 2019 at 3:56 PM
  14. BBerson replied to the thread Shoulder wing unpopularity.

    What is that neat C-4 airplane? Looks like a Dehavilland DH-53 without struts.

    Nov 18, 2019 at 3:54 PM
  15. BBerson replied to the thread Boeing - Design Issues....

    The other thing that was interesting: I think it said the Ethiopia pilots did turn off the electric trim switch as trained, but still...

    Nov 18, 2019 at 3:06 AM


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