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Type: Posts; User: Ivanstein

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    I don't have access to jump the fence and get...

    I don't have access to jump the fence and get close over there. You can just see his tail sticking up beyond the parked cars.

    Sent from my Pixel XL using Tapatalk
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    This is a story that has been told hundreds of...

    This is a story that has been told hundreds of times during my childhood and while the details vary slightly from telling to telling, its always good for a laugh.

    My dad and uncles grew up in...
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    Doc out doing a run up

    Walking out of the parking lot at work and I heard the sound of a propeller beating the air, which is odd for McConnell.

    There was Doc doing a run up. Best picture I could get. Wish I could get...
  4. Thread: New to forum

    by Ivanstein
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    38,130

    Niu has a pretty good write up on design loads...

    Niu has a pretty good write up on design loads for aircraft landing gear. I will be consulting that when the time comes.

    Aileron sizing is usually done to keep good authority at low speeds. I...
  5. This is the one I saw. Sent from my XT1585...

    This is the one I saw.

    Sent from my XT1585 using Tapatalk
  6. I saw that the Kolb Firefly is disassembleable...

    I saw that the Kolb Firefly is disassembleable (that's a real word...I don't make stuff up!).

    One video a guy had one on a trailer neatly packaged. It did appear to take quite some time to...
  7. Thread: New to forum

    by Ivanstein
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    38,130

    Well, if you've heard the phrase "Boeing builds...

    Well, if you've heard the phrase "Boeing builds 'em better", you probably have a good idea how that will work.

    The 737 fuselage has skin panels as thin as 0.040" thick and that holds pressure and...
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    If you could throw in an autoclave, then...

    If you could throw in an autoclave, then homebuilts could be made from prepreg composite.

    However, I see a few sticking points from the manufacturing point of view...

    The cost of making a mold...
  9. Thread: New to forum

    by Ivanstein
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    31
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    38,130

    I have all the tools I need for that. I can do a...

    I have all the tools I need for that. I can do a fair amount of hand calcs to preserve the months long headache of FEA and get pretty close yet stay conservative. When the time comes, I will break...
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    Flaperon mechanical mixing

    Does anyone know if there are any good books, links, etc. on mechanical mixing designs for flaperons? Even ruddervators might work.

    I havr tried to get ideas from the Bonanza and such, but the...
  11. Thread: New to forum

    by Ivanstein
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    38,130

    Same with Airframe Structural Design by Niu....

    Same with Airframe Structural Design by Niu. Pricey.

    Anything with stress concentration factors (Like Peterson's) is highly expensive as well.

    My Raymer book was about $300 from what I...
  12. Thread: New to forum

    by Ivanstein
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    38,130

    You are correct. Cruise assumes only enough lift...

    You are correct. Cruise assumes only enough lift to balance drag and with a prop driven craft, the best range comes at best L/D, so drag is the driving parameter. With a high camber airfoil as needed...
  13. Thread: New to forum

    by Ivanstein
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    38,130

    Thats all correct, except the design is based on...

    Thats all correct, except the design is based on the "required" wing loading for best performance at any given regime.

    Think of it like this...
    At stall, your wing is operating at maximum lift....
  14. Thread: New to forum

    by Ivanstein
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    38,130

    Not really. Wing loading is calculated for each...

    Not really. Wing loading is calculated for each expected flight regime. Select the lowest, and size the wing to maintain that wing loading. In this case, because the speed envelope of the ultralight...
  15. Thread: New to forum

    by Ivanstein
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    38,130

    6678 6679 Picture of some surfacing I have...

    6678
    6679

    Picture of some surfacing I have done. The transparent box is the interior dimension for a 20ft enclosed trailer I looked up on line. One of the design goals is to make it fit in one...
  16. Thread: Doc

    by Ivanstein
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    We have dozens of KC-135s here because of...

    We have dozens of KC-135s here because of McConnell, and I see them nearly every day because I work at Spirit Aerosystems which is right across the street from that runway. There are T-38s here...
  17. Thread: New to forum

    by Ivanstein
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    38,130

    I have been faithfully crunching numbers on this...

    I have been faithfully crunching numbers on this and have been getting a bunch of really terrible expected wing area results.

    In the order of 220ft^2.

    This is all driven by, believe it or not,...
  18. Thread: Doc

    by Ivanstein
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    6,923

    Doc

    Well, Sunday afternoon I saw Doc fly out of KICT from (I suspect) 1L. Flew in direct view of my back porch and made quite the majestic rumble and glinted in the sun. First time I have seen a B-29...
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    Well, not necessarily more intelligent, but more...

    Well, not necessarily more intelligent, but more practiced...?

    I have a minor in mathematics in addition to my AE degree. That is an elegant way of saying I have very little personality left and...
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    This will probably show my level (or lack...

    This will probably show my level (or lack thereof) of knowledge, but aren't "wind triangles" just graphical vector addition?

    Sent from my XT1585 using Tapatalk
  21. Thread: New to forum

    by Ivanstein
    Replies
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    38,130

    Thanks for that. I am currently running...

    Thanks for that. I am currently running calculations for my altitude +1000' which is right at 2300' msl. So, if I am reading the description correctly, the airspeeds can be corrected for a standard...
  22. Thread: New to forum

    by Ivanstein
    Replies
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    38,130

    New to forum

    Greetings,

    I am a new to the forum and new to ultralight aviation.

    I am an aerospace engineer and have decided to design and build my own ultralight. I got into engineering late in the game and...
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