P-51C at ~70% scale as ultralight?

Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by J.L. Frusha, Apr 30, 2019.

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  1. Jun 12, 2019 #301

    Lendo

    Lendo

    Lendo

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    MC 104, Their all good but approaches do differ, I will buy a book and be happy to get just one, (what I call) 'Golden Nugget' of information. I paid $500 Aust. for one book.
    Naturally members on here have been extremely helpful as well.

    J.l. Excel is a good standard, I know Roncz has used different ones, but unsure what they are - as long as they do the job. I will be looking forward to your success, as I find you project interesting.
    George
     
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  2. Jun 16, 2019 #302

    J.L. Frusha

    J.L. Frusha

    J.L. Frusha

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    Been a busy week working on a Biogas project and playing family chaufer. Too much going on to get anything done on this, right now.

    I live on a goat farm and will be putting in a 9 acre Alfalfa field, probably using Subsurface Drip Line watering. Definitely going to be a challenge to overcome the rocky soil..
     
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  3. Jun 18, 2019 #303

    Lendo

    Lendo

    Lendo

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    J.L. Some things are not always obvious in other peoples Spread Sheets (SS). Not to say their wrong, I just like to know all that goes into the calculations, for my own education and clarification. If you do your own SS with good notations, going back to check things makes it so much easier. Mind you I learnt the hard way.
    George
     
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  4. Jun 18, 2019 #304

    J.L. Frusha

    J.L. Frusha

    J.L. Frusha

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    Thank you. I don't know enough to properly use all of the features in the ones I have found, but I really do NOT have the background to set up a spreadsheet on my own. By using multiple spreadsheet calculations, I figue I'll at least be able to get a decent approximation of the values.
     
  5. Jun 18, 2019 #305

    BJC

    BJC

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    There are lots of spreadsheets available, and some are good. All require an understanding of the embedded assumptions, approximations and formulas. Always do, or get, a sanity check on all results. And enjoy the chase.


    BJC
     
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  6. Jun 19, 2019 #306

    Lendo

    Lendo

    Lendo

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    BJC and J.L., Who was it that said Aeronautical Engineering are approximations to 8 decimal points.

    In my most humble opinion, if you can maintain accuracy to a high degree, going into formulas/ calculations - you're a better chance of getting something reasonably accurate as a result.
    LIke computers, shite in - shite out.
    George
     
  7. Aug 2, 2019 #307

    MadProfessor8138

    MadProfessor8138

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    How far along on the design are you now ?

    Kevin
     
  8. Aug 4, 2019 #308

    akwrencher

    akwrencher

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    Can't find it right now, but I believe the quote is something like "aeronautical engineering is highly educated guesswork worked out to several decimal places", IIRC.
     

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